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extension UIViewController { static var current:UIViewController? { let delegate = UIApplication.shared.delegate as? AppDelegate var current = delegate?.window.rootViewController while (current?.presentedViewControlle.

废话不多说上代码private var key: Void?extension MyClass{ var b:String? { get{ objc_getAssociatedObject(self, &key) as? String } set{ objc_setAssociatedObject(self, &key, newValue, .OBJC_ASSOCIATION_RETA