dev. import SwiftUI import Combine class HomeViewModel: ObservableObject, Identifiable { @Published var companyName: String = "" private var db = Firestore. 3. md","path":"proposals/0001-keywords-as-argument. When you declare a function that takes a closure as one of its parameters, you can write @escaping before the parameter’s type to indicate that the closure is allowed to escape. You might want to. Team has an array built in which holds 23 instances of the Player class, all with their own properties and methods. In Swift, there are two ways to capture self as a strong reference within an escaping closure. 0. md","path":"proposals/0001-keywords-as-argument. e. Try below and let me know if it works: public struct ExampleStruct { let connectQueue = DispatchQueue (label: "connectQueue", attributes: . x and Swift 2. md","path":"proposals/0001-keywords-as-argument. 5 seco. It gives the error, Instance members cannot be used on type. Yes. self. I hope you can help. I know there are a lot of questions out there that have been answered on how to use @escaping functions in general. SwiftUI Escaping closure captures mutating 'self' parameter. people. Based on this and the empty set your descriptiveDate and descriptiveInt don't need to be Binding just a get for a String. 2. The simple solution is to update your owning type to a reference once (class). 1 Answer. When you use an escaping closure from within a struct, you can only use an immutable capture of an instance. funkybro funkybro. center, spacing: 20, content: {Text("d")}) this is a instance of struct VStack, and when creating an instance of it, the third parameter takes closure as a parameter. if don’t want to escape closure parameters mark it as. {"payload":{"allShortcutsEnabled":false,"fileTree":{"proposals":{"items":[{"name":"0001-keywords-as-argument-labels. The first is to explicitly use the self keyword whenever we’re calling a method or accessing a property on the current object within such a closure. Value types are copied (at least effectively) on assignment, so if a closure captures a mutable value type which copy is being mutated? Early Swift had a compromise semantics which did the expected thing most of the time, but produced confusing results at. e. people. {"payload":{"allShortcutsEnabled":false,"fileTree":{"proposals":{"items":[{"name":"0001-keywords-as-argument-labels. Instantly share code, notes, and snippets. This has been asked and answered before. Non-escaping closures on the other hand, cannot be stored and must instead be executed directly when used. When you declare a function that takes a closure as one of its parameters, you can write @escaping before the parameter’s type to indicate that the closure is allowed to escape. To have a clean architecture app, you can do something like this. I would suggest you to use class instead of struct. But if you make it @escaping, you get error: escaping closure captures mutating 'self' parameter. Type, completionHandler: @escaping (String?)->Void)Stack Overflow Public questions & answers; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Talent Build your employer brand ; Advertising Reach developers & technologists worldwide; Labs The future of collective knowledge sharing; About the companyStack Overflow | The World’s Largest Online Community for DevelopersProtocol '. That way, the view controller will get deallocated if. I'm using ReSwift to fabricate a video player app and I'm trying to get my SwiftUI view to update the AVPlayer URL based on a ReSwift action…If you want to run the Docker image in a complete offline environment, you need to add the --build-arg with_models=true parameter. onShow = { self. Q&A for work. this AF. dismiss () } } This isn't what I want. What's happening in your code is that your inout variable is escaping the lifetime of the function (by being captured in a closure that is then stored) – meaning that any changes to the inout. Your function is asynchronous, so it exits immediately and cani is not modified. Even the name UILogic , while just a name, hints that you may need to rethink your use of the MVVM architecture. This is what separates a closure (which "closes over" the scope where it was created) and an anonymous function (which does not). As Joakim alluded to, anonymous arguments are the $0, $1, arguments that are just based on the order of the parameters. 1 Answer. 6. Previous ID SR-2474 Radar None Original Reporter @karwa Type Bug Status Resolved Resolution Duplicate Environment Swift f5f6905 Additional Detail from JIRA Votes 0 Component/s Compiler Labels Bug,. scheduledTimer (withTimeInterval: 1. My question is do I need to use [unowned self] when the. 3 Escaping closure captures mutating 'self' parameter: struct Escaping closure captures mutating 'self' parameter: struct. { // assign function directly instead of via capturing closure viewModel = TimerViewModel(totalTime: 15, finished: timerCallback) } var body: some View { Text("Demo") } private func timerCallback. When the closure is of escaping type, i. image = $0 } // 雖然下面的語法沒有出現錯誤訊息，但依然沒用SOLVED: Escaping closure captures 'inout' parameter Forums > Swift @kikashi59 Jun '21 I'm trying to get a web page, parse it and return a value extracted. Escaping closure captures non-escaping parameter 'completion' (Swift 5) In my project, I came across a situation when I need to use the background queue to create an AVPlayerItem (which I create in setupTrackModels function). I am having troubles with running view methods on published property value change. – Rob. I use this boolean to show a view on a certain state of the view. g. Aggregates, such as enums with associated values (e. before you use them in your code, such as self. 👉 StackOverflow： What's 'Escaping closure captures mutating 'self' parameter' and how to fix itSwift 5 : What's 'Escaping closure captures mutating 'self' parameter' and how to fix it. e. so i was fiddling around with recreating the State<T> and Binding<T> property wrappers, and i'm really confused that they're both declared structs, presumably with “value” semantics like everything else in the language, yet the Binding<T> should be able to mutate the State<T> by reference, and i can’t seem to construct the closures to make the. If n were copied into the closure, this couldn't work. The closure is then executed after a delay of 1 second, showcasing the escaping nature of the closure which allows it to be executed after the function's. increase() // may work } If you change model to reference type, i. {"payload":{"allShortcutsEnabled":false,"fileTree":{"proposals":{"items":[{"name":"0001-keywords-as-argument-labels. Follow edited Dec 1, 2020 at 4:46. Connect and share knowledge within a single location that is structured and easy to search. ' to make capture semantics explicit". md","path":"proposals/0001-keywords-as-argument. reversed (). And beware to capture self weakly ([weak self] in) to avoid retain-cycles. . However, when I tried to do something like this post, I got these errors: 1. Teams. {"payload":{"allShortcutsEnabled":false,"fileTree":{"proposals":{"items":[{"name":"0001-keywords-as-argument-labels. But it doesn't seem to be what you are actually doing. 1. Masalah: Saya mendapatkan Escaping closure captures mutating 'self' parameterkesalahan seperti yang ditunjukkan pada kode. Modify variable in SwiftUI. Fetch data from server swiftUI. When creating a closure in mutating function of a struct capturing self is not possible: struct Foo {var bar: Bool mutating func createClosure ()-> ()-> Bool {return {// Error: Escaping closure captures mutating 'self' parameter return self. lazy implies that the code only runs once. then. The function that "animates" your struct change should be outside it, in UILogic , for example. The closure will decide which of these to use based on what the body of the function does with the captured values. However, you’re not allowed to let that inout parameter escape. When your timer closure is called, first you don't even know if the caller is still. Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. var myself = self // making a copy of self let closure = { myself. Connect and share knowledge within a single location that is structured and easy to search. (The history of the term "close over" is kind of obscure. Escaping closures are closures that have the possibility of executing after a function returns. 3. Mutating self (struct/enum) inside escaping closure in Swift 3. The classical example is a closure being stored in a variable outside that function. So my. struct ContentView: View { @State var buttonText = "Initial Button Label. login { (didError, msg) in } }. {"payload":{"allShortcutsEnabled":false,"fileTree":{"proposals":{"items":[{"name":"0001-keywords-as-argument-labels. So, after a function returns, a variable that is passed as &variable will have the modified value In most cases, Swift manages memory…By default a closure is nonescaping like your dispatch parameter, but you are calling it inside an escaping closure which probably is the closure that you pass as a parameter in getMovies function. Easiest way is to use the capture list when creating escaping closure, and in that capture list you explicitly capture self as a weak reference:Stack Overflow Public questions & answers; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Talent Build your employer brand ; Advertising Reach developers & technologists worldwide; About the companyerror: Converting non-escaping parameter 'completionHandler' to generic parameter 'Element' may allow it to escape By Definition: "A non escaping closure goes out of the scope and stops existing in memory as soon as the function body gets executed. async { throws Cannot convert value of type ' ()' to closure result type ' [Post]' and final 3. Does not solve the problem but breaks the code instead. The line that begins with let request = throws the following error: Escaping closure captures mutating 'self' parameter. {"payload":{"allShortcutsEnabled":false,"fileTree":{"proposals":{"items":[{"name":"0001-keywords-as-argument-labels. bar }}} var foo = Foo (bar: true) let closure = foo. public struct LoanDetails { public var dueDate: String? public init () {} } public func getLoanDetails (_ result: @escaping (_ loanDetails. ContentView. In order for closure queue. In Swift 3, inout parameters are no longer allowed to be captured by @escaping closures, which eliminates the confusion of expecting a pass-by-reference. About;. This has been asked and answered before. Follow asked Jun 13, 2022 at 16:33. Cannot assign to property: 'self' is immutable problem. 14. default). Actually it sees that if after changing the inout parameter if the function returns or not i. SPONSORED Elevate your skills from design to SwiftUI by joining Design to SwiftUI, where you'll become skilled in weaving in unique design elements that enhance both aesthetics and user experience. md","path":"proposals/0001-keywords-as-argument. I understand the problem with trying to modify a struct from within a closure, but I don't know what I'd need to change to be able to update the UI, based on the results from the face detection request. – Berik. 上面代码会报错：“Escaping closure captures mutating 'self' parameter” 逃逸闭包不可修改 的self这个参数。 当self是结构体或枚举实例时，逃逸闭包不能捕获此self。 如果self是一个类的实例，则逃逸闭包能捕获self。 如果只是普通闭包则能捕获所有类型的self。 项目中使用. toggle). To have a clean architecture app, you can do something like this. 3. Connect and share knowledge within a single location that is structured and easy to search. contextMenu with the option to call editName() from the individual. Q&A for work. You can use a backtick to escape reserved words: struct Links: Codable { var `self`: String } If you don't want to use self, you can map a json key to a different property using manually defined CodingKeys: struct Links: Codable { var me: String enum CodingKeys: String, CodingKey { case me = "self" } }test. – ctietze. md","path":"proposals/0001-keywords-as-argument. import Foundation public struct Trigger { public var value = false public. // escaping closure captures mutating `self` parameter . Also notice that timeLeft is defined in two. In the main content view of my app, I display a list of these homeTeam. Unfortunately, without seeing the closure, I cannot tell you why the closure is escaping. I find a pitfall when using value type and escaping closure together. As view is non-mutating here, I would refactor provided code by decomposing related things into explicit view model as below. 函数返回. Escaping closure captures non-escaping parameter 'action' You’re now watching this thread. The @escaping attribute indicates that the closure will be called sometime after the function ends. The block closure is marked with the @escaping parameter attribute, which means it may escape the body of its function, and even the lifetime of self (in your context). Even if you can. Now that we’re no longer returning the Counter instance, we’ve stopped making a separate copy of it. When you use an escaping closure from within a struct, you can only use an immutable capture of an instance. {"payload":{"allShortcutsEnabled":false,"fileTree":{"proposals":{"items":[{"name":"0001-keywords-as-argument-labels. . You can fix this by either removing @escaping, or you change the value types to reference types. Otherwise these models get downloaded on the first run of the image/container. For example, that variable may be a local. 1 Answer. the closure that is capturing x is escaping kind or nonescaping kind. Add a. Escaping closure captures non-escaping parameter 'completion' (Swift 5) 1 Capturing closures within closures: Xcode throws error: Escaping closure captures non-escaping parameterTeams. Binding is by definition a two-way connection. 2. swift class GetLocations :ObservableObject { @Published var arrLocations = NSArray () func getLocNames (Action:String, Id: String, completion: @escaping (NSArray) -> Void) { //fetch data from server let session = URLSession. S. – ctietze. When I debug with breakpoints it shows Disposables. 5 seco. Q&A for work. 3 Swift can change struct declared with let if using an index but not if using a loop. The following is the essence of the code in question: we have some Int @State that we want to countdown to zero with second intervals but adding closures to the dispatch queue from a function to itself does not seem to work: func counting (value: inout Int) { value -= 1 if value > 0 { // ERROR: Escaping closure captures 'inout' parameter. Actually it sees that if after changing the inout parameter if the function returns or not i. md","path":"proposals/0001-keywords-as-argument. option 1 & 2 produce a compile error: "Escaping closure captures mutating 'self' parameter", this is an architectural issue, do not mutate a view state during view render cycle, rather change the view's data model outside of the render cycle and let the re-render of the view reflect that change, that is why - options 3 & 4 are preferred either. Prior to Swift 3 (specifically the build that ships with Xcode 8 beta 6), they would default to being escaping – you would have to mark them @noescape in order to prevent them from being stored or captured, which guarantees they won't outlive the duration of the. –as you can see I would need to fill my list until InvitationService Request ends but If I try to put it inside the code I got a. invitationService. I first wrote the editor class to receive a closure for reading, and a closure for writing. EDIT: Seems like you cannot mutate structs anymore in escaping closure without removing @escaping which not be possible in your case. Protocol '. Value types are copied (at least effectively) on assignment, so if a closure captures a mutable value type which copy is being mutated? Early Swift had a compromise semantics which did the expected thing most of the time, but produced confusing results at other times. _invitationsList = State< [Appointment]?>. From the 'net:-=-A closure keeps a strong reference to every object the closure captures — and that includes self if you access any property or instance method of self inside the closure, because all of these carry an implicit self parameter. Swift: Capture inout parameter in closures that escape the called function. Rewrite your closure to ensure that it cannot return a value after the function returns. onReceive (somePublisher) { self. {"payload":{"allShortcutsEnabled":false,"fileTree":{"proposals":{"items":[{"name":"0001-keywords-as-argument-labels. 函数执行闭包（或不执行）. In a member func declaration self is always an implicit parameter. This is one of the crucial differences between member func declarations and closure declarations: self has different meaning in those. Q&A for work. . 0. wrappedValue. Escaping closure captures mutating 'self' parameter (I really need help!) – SwiftUI – Hacking with Swift forums NEW: Learn SwiftData for free with my all-new book! >>. 函数执行闭包（或不执行）. . non-escaping. That means in self. Use @escaping to indicate that a closure parameter may escape. Accessing an actor's isolated state from within a SwiftUI view. Apr 9, 2021 at 19:27. As the error said, in the escaping closure, you're capturing and mutating self (actually self. 539. the closure that is capturing x is escaping kind or nonescaping kind. An escaping closure is like a function variable that can be performed at a later time. off state: private enum MyTimer { case off. If you provide. Does not solve the problem but breaks the code instead. 当函数结束时，传递的闭包离开函数作用域，并且没有其他的引用指向该闭包。. func loadData(){ LoadXZYAPI() { [weak self] (data:Any?) in guard let strongSelf = self else { return } strongSelf. init (initialValue. When the closure is of escaping type, i. Why does Swift 3 need @escaping annotation at all? Related. " but we are using this inside the function5 Answers. Viewed 921 times 1 This question. Escaping closure captures non. "{"payload":{"allShortcutsEnabled":false,"fileTree":{"proposals":{"items":[{"name":"0001-keywords-as-argument-labels. Swift 5 : What's 'Escaping closure captures mutating 'self' parameter' and how to fix it (3 answers) Closed last year. But to be sure that self exists at the moment when completionHandleris called compiler needs to copy self. md","path":"proposals/0001-keywords-as-argument. What you actually seem to have implemented is a struct (or class) containing a timer. Here. (SE-0103)The warning typically arises when a mutating method that modifies a variable is passed a non-escaping closure that reads from the same variable. If we are sending some self value into it, that will risk the closure behave differently upon its execution. md","path":"proposals/0001-keywords-as-argument. Closures normally capture by reference, but it mentions in a note in the Swift Language Guide that: "As an optimization, Swift may instead capture and store a copy of a value if that value is not mutated by or outside a closure. When creating a closure in mutating function of a struct capturing self is not possible: struct Foo {var bar: Bool mutating func createClosure ()-> ()-> Bool {return {// Error: Escaping closure captures mutating 'self' parameter return self. ⛔. . A closure is said to escape a function when the closure is passed as an argument to the function, but is called after the function returns. Asking for help, clarification, or responding to other answers. Swift 's behavior when closures capture `inout` parameters and escape their enclosing context is a common source of confusion. If you are making an asynchronous network request you do want the closure to retain self for when the request finishes. The escaping closure is the Button's action parameter, and the mutating function is your startTimer function. it just capture the copied value, but before the function returns it is not called. ⛔. How do I reference a mutable variable in a completion handler (so that I can access it's property's value at the time that the completion handler is eventually called, not when it is captured) while avoiding the "Escaping closure captures mutating 'self' parameter" error?I have a boolean called 'isMatched'. ' can only be used as a generic constraint because it has Self or associated type. Swift-evolution thread: [only allow capture of inout parameters in. If I change to a class the error does not occurs. That's the meaning of a mutating self parameter . From the 'net:-=-A closure keeps a strong reference to every object the. 1 Answer. 0. Don't do that, just store the expiry time. Stack Overflow. Tuple, Any, Closure are non-nominal types. Protocol '. However, I want the view to get hidden automatically after 0. bar }}} var foo = Foo (bar: true) let closure = foo. Structs are immutable. createClosure closure To work around this you can. With RevenueCat Paywalls you can customize native, remotely configurable paywall templates and optimize them with Experiments. 4. Even if you can bypass that, you still have the. md","path":"proposals/0001-keywords-as-argument. toggle). Dan saya menduga parameter escaping closureis the func startTimerdan yang menyinggung 'self' parameteradalah countDownTime, tetapi saya tidak begitu yakin apa yang terjadi atau mengapa itu salah. 0. id > $1. It's incorrect in theory. A closure is said to escape a function when the closure is passed as an argument to the function, but is called after the function returns. you may need to assign a value to the vars you have, for example, var firstName: String = "" etc. Hi guys, im trying to get data from JSON and assign it to my struct's property, now it keeps saying that "self is immutable cause as far as i know struct is a value type, now I'm wondering what is a good way to assign my struct via JSON cause it doest let me to assign the info into the struct. You need to pass in a closure that does not escape. 1. md","path":"proposals/0001-keywords-as-argument. posts. lazy implies that the code only runs once. overlayVC = nil // 📝 note: captured here } } } When this code used to be "embedded" into the view controllers that used it, it worked fine, because the NSAnimationContext completion handler could capture a mutating reference to self (the view controller, which was an instance of a class). It has to do with the type parameter. Stack Overflow Public questions & answers; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Talent Build your employer brand ; Advertising Reach developers & technologists worldwide; About the companyHi all. non-escaping的生命周期：. players and each row has a . I want to pop in response to an event on my observable. Last modified. DispatchQueue. Ask YouChat a question!Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solutionSince structs are value, they are copied (with COW-CopyOnWrite) inside the closure for your usage. advanced (by: 3) OperationQueue. Basically, it's about memory management (explicit/escaping vs. I spent lot of time to fix this issue with other solutions unable to make it work. bar. The function that "animates" your struct change should be outside it, in UILogic , for example. md","path":"proposals/0001-keywords-as-argument. If you’ve opted in to email or web notifications, you’ll be notified when there’s activity. @matt actually i want to use a request function that requesting to api and return something after i fire so the closure came to my mind and i've already check which response should i show to user so being call this function is just GetData {(network) in //do nothing cuz we're already set its action inside the function itself} – Anonymous-E1 Answer. Sponsor the site. How to run a function inside a body of SWIFT UI? 0. Stack Overflow | The World’s Largest Online Community for DevelopersClosure parameters are non-escaping by default, rather than explicitly being annotated with @noescape. My issue is a bit more niche as I am working with an API that gives me a function that takes in an @escaping function (or so I think). Teams. value!. md","path":"proposals/0001-keywords-as-argument. import SwiftUI import. Swift, actor: Actor-isolated property 'scanning' can not be mutated from a non-isolated context. MyView {value in MyContent() } How do I declare the view to have that?{"payload":{"allShortcutsEnabled":false,"fileTree":{"proposals":{"items":[{"name":"0001-keywords-as-argument-labels. 2. just as when. Does anyone know how I can make something like this work? swiftui; Share. init (initialValue. request code should take place in PeopleListVM which is a reference type, so you don't have mutating self problem. Do I need to use a class in this case? Or is there some implementation that I don't know/haven't thought of (maybe with Combine?)? Any advice is much appreciated! P. Cannot use mutating member on immutable value: 'self' is immutable. Look at the below code:Mutating regular member var get error: "Cannot assign to property: 'self' is immutable" "Cannot use mutating member on immutable value: 'self' is immutable" struct porque: View { @State private var flag = false private var anotherFlag = false mutating func changeMe(_ value: Bool) { self. Learn more about TeamsI am working in Swift trying to update an organization struct that will need to hold a latitude and longitude. This file contains bidirectional Unicode text that may be interpreted or compiled differently than what. However, I got the error, Escaping closure captures mutating 'self' parameter, and I understand now that I can't mutate the struct from the asynchronous timer. ios: Closure cannot implicitly capture a mutating self parameterThanks for taking the time to learn more. Output: It prints 6 then “Hi closure is executing” Escaping Closures: You need to mention @escaping with closure parameters to make it as escaping closure. The first is to capture a reference to the struct, but in many cases it lives on the stack. He also suggest we investigate changing the default language rule for optional parameter closures. The simple solution is to update your owning type to a reference once ( class ). Click here to visit the Hacking with Swift store >> @twostraws. com. Non-escaping closure can't capture mutating self in Swift 3. Instead you have to capture the parameter by copying it, by. If n were copied into the closure, this couldn't work. 将闭包传递给函数. Xcode return: Escaping closure captures mutating 'self' parameter. Do I need to use a class in this case? Or is there some implementation that I don't know/haven't thought of (maybe with Combine?)? Any advice is much appreciated! P. x and Swift 2. {"payload":{"allShortcutsEnabled":false,"fileTree":{"proposals":{"items":[{"name":"0001-keywords-as-argument-labels. ). 1. In closure declarations any identifier not declared as a parameter is captured from the environment outside of that closure. onShow() } 1 file 0 forks 0 comments 0 stars plivesey / Pirates Hint #3. // This actually throws an error: Escaping closure captures mutating 'self' parameter: toastManager. md","path":"proposals/0001-keywords-as-argument. Struct data assignment error: closure cannot implicitly capture a mutating self parameter 0 Decode JSON Data on Swift 4 returns nil Escaping closure captures mutating 'self' parameter (SWIFT 5) [duplicate] Ask Question Asked 3 years ago. It registers a sink and saves the cancellable inside the view which makes the subscriber live as long as the view itself does. Click again to stop watching or visit your profile to manage watched threads and notifications. turnON(). Hi, I’m new to Swift and also to SwiftUI. Learn more about TeamsApplying borrow and take modifiers to the self parameter of methods. Compiler gives "closure cannot implicitly capture a mutating self parameter". request code should take place in PeopleListVM which is a reference type, so you don't have mutating self problem. Asking for help, clarification, or responding to other answers. numberToDisplay += 1 // you can't mutate a struct without mutating function self. it just capture the copied value, but before the function returns it is not called. This is not allowed. This is not allowed. ⛔️ escaping closure captures mutating 'self' parameter. In structs copy means creating new instance. I understand the problem with trying to modify a struct from within a closure, but I don't know what I'd need to change to be able to update the UI, based on the results from the face detection request. func exampleFunction() { functionWithEscapingClosure(onSuccess: { result in self. swift. ' to make capture semantics explicit" 7. 上面代码会报错：“Escaping closure captures mutating 'self' parameter” 逃逸闭包不可修改 的self这个参数。 当self是结构体或枚举实例时，逃逸闭包不能捕获此self。 如果self是一个类的实例，则逃逸闭包能捕获self。 如果只是普通闭包则能捕获所有类型的self。 项目中使用. An example of non-escaping closures is when. So my questions are Do we have it, and If so, how do. In the Core Audio Recorder example the AudioQueueInputCallback function is written as a variable binding outside the class Recorder. Error: Escaping closure captures mutating 'self' parameter Whenever I need to capture a mutating instance of self, I must call a mutating function on the type itself after it has been initialized. ところが、イニシャライザで実装しているようにStateの変更をトリガーにUITextViewのプロパティを変更したいと思っても、Escaping closure captures mutating 'self' parameterというエラーが出てコンパイルできません。Hi Swift community, The review of SE-0377: borrow and take parameter ownership modifiers begins now and runs through November 8, 2022. empty elements. You can subscribe to it in order to set the description property, but you'd have to move this whole logic into an ObservableObject view model, since you cannot mutate a View. Escaping closure captures mutating 'self' parameter. org. 229k 20 20 gold. x, closure parameter was @escaping by default, means that closure can be escape during the function body execution. i. and that's fine. The value. I. So, basically the closure is executed after the function returns. In a member func declaration self is always an implicit parameter. So just saving a closure in some variable doesn't necessarily mean it's leaked outside the function. You can set initial values inside init, but then they aren't mutable later. This results in a strong reference cycle. Creating a simple card game (Set) and I have a function in the model that deals X cards onto the deck.