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April 9, 2018 20:23
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Extension to create Timer/CADisplayLink which don't strongly reference their target
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private class WeakTarget: NSObject { | |
private(set) weak var target: AnyObject? | |
let selector: Selector | |
static let triggerSelector = #selector(WeakTarget.timerDidTrigger(parameter:)) | |
init(_ target: AnyObject, selector: Selector) { | |
self.target = target | |
self.selector = selector | |
} | |
@objc private func timerDidTrigger(parameter: Any) { | |
_ = self.target?.perform(self.selector, with: parameter) | |
} | |
} | |
extension Timer { | |
convenience init(timeInterval ti: TimeInterval, weakTarget: AnyObject, selector: Selector, userInfo: Any?, repeats: Bool) { | |
self.init(timeInterval: ti, target: WeakTarget(weakTarget, selector: selector), selector: WeakTarget.triggerSelector, userInfo: userInfo, repeats: repeats) | |
} | |
class func scheduledTimer(timeInterval ti: TimeInterval, weakTarget: AnyObject, selector: Selector, userInfo: Any?, repeats: Bool) -> Timer { | |
return self.scheduledTimer(timeInterval: ti, target: WeakTarget(weakTarget, selector: selector), selector: WeakTarget.triggerSelector, userInfo: userInfo, repeats: repeats) | |
} | |
} | |
extension CADisplayLink { | |
convenience init(weakTarget: AnyObject, selector: Selector) { | |
self.init(target: WeakTarget(weakTarget, selector: selector), selector: WeakTarget.triggerSelector) | |
} | |
} |
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