How to set CADisplayLink in Swift with weak reference between target and CADisplayLink instance

Question

In Objective-C, we can init CADisplayLink with Proxy Pattern to break strong reference:

WeakProxy *weakProxy = [WeakProxy weakProxyForObject:self];
self.displayL         


        

Answer 1

An better approach might be to invalidate the display link in viewWill/DidDisappear, see also

• Correct handling / cleanup / etc of CADisplayLink in Swift custom animation?

for useful information.

If that is not an option: Make the proxy object inherit from NSObject instead of NSProxy. An Objective-C solution is for example given here

• CADisplayLink at iOS 6.0 not retaining target

and that can easily be translated to Swift 3:

class JAWeakProxy: NSObject {
    weak var target: NSObjectProtocol?

    init(target: NSObjectProtocol) {
        self.target = target
        super.init()
    }

    override func responds(to aSelector: Selector!) -> Bool {
        return (target?.responds(to: aSelector) ?? false) || super.responds(to: aSelector)
    }

    override func forwardingTarget(for aSelector: Selector!) -> Any? {
        return target
    }
}

which can then be used as

displayLink = CADisplayLink(target: JAWeakProxy(target: self),
                            selector: #selector(didRefresh(dpLink:)))

Your approach

weak var weakSelf = self    
displayLink = CADisplayLink(target: weakSelf!, selector: #selector(displayDidRefresh(dpLink:)))

does not work because it unwraps weakSelf when the CADisplayLink is initialized and passes a strong reference to self as the target.