错误：Escaping 闭包捕获变异的“自我”参数

Question

I've reviewed the other questions on this topic on SO (there are many) but none of them address this error pertaining to a @State . And I thought that this was the very problem that @State solved!

Here is the relevant code

 struct ViewA: View {
    @State private var startAnimation = false
    
    let width: CGFloat
    let height: CGFloat
    
    init(width: CGFloat, height: CGFloat) {
        self.width = width
        self.height = height
        
        DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) {
            
            startAnimation = true //<--- The error is on this line
        }
            
        
    }
    
    var body: some View {
        Circle()
            .frame(width: width, height: height)
            .scaleEffect(CGSize(width: startAnimation ? 5.0 : 1.0 , height: startAnimation ? 5.0 : 1.0))
    }
}

There error is Escaping closure captures mutating 'self' parameter

Now reviewing the other SO questions related to this error lets me know that this error is related to time delayed changes ...

Answer 1

I don't think it has anything to do with the @State property, but with the fact that you are using an @escaping closure. An escaping closure can cause a strong reference cycle if you use self inside the closure. See for a nice article explaining @escaping closures this link .

Kind regards, MacUserT