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我已经阅读了nshipster article,但在这段代码中
struct Static { static var token: dispatch_once_t = 0 }
有关更多详细信息,请参阅Whither dispatch_once in Swift 3
为了不同的目的,您必须使用不同的swizzling实现
可旋转的CocoaTouch类
示例使用全局变量来调用viewWillAppear(_ :)的UIViewController
private let swizzling: (UIViewController.TypE) -> () = { viewController in let original@R_607_10288@ctor = #@R_607_10288@ctor(viewController.viewWillAppear(_:)) let swizzled@R_607_10288@ctor = #@R_607_10288@ctor(viewController.proj_viewWillAppear(animated:)) let originalMethod = class_geTinstanceMethod(viewController,original@R_607_10288@ctor) let swizzledMethod = class_geTinstanceMethod(viewController,swizzled@R_607_10288@ctor) method_exchangeImplementations(originalMethod,swizzledMethod) } extension UIViewController { open override class func initialize() { // make sure this isn't a subclass guard self === UIViewController.self else { return } swizzling(self) } // MARK: - Method Swizzling func proj_viewWillAppear(animated: Bool) { self.proj_viewWillAppear(animated: animated) let viewControllerName = NSStringFromClass(type(of: self)) print("viewWillAppear: \(viewControllerName)") } }
Swift喜欢Swift的Swift课程
要使用Swift类的方法,您必须遵守以下两项要求(for more details):
>包含要旋转的方法的类必须扩展NSObject
>您想要旋转的方法必须具有动态属性
和例子Swiftzling方法定制Swift基类Person
class Person: NSObject { var name = "Person" dynamic func foo(_ bar: Bool) { print("Person.foo") } } class ProgrAMMer: Person { override func foo(_ bar: Bool) { super.foo(bar) print("ProgrAMMer.foo") } } private let swizzling: (Person.TypE) -> () = { person in let original@R_607_10288@ctor = #@R_607_10288@ctor(person.foo(_:)) let swizzled@R_607_10288@ctor = #@R_607_10288@ctor(person.proj_foo(_:)) let originalMethod = class_geTinstanceMethod(person,original@R_607_10288@ctor) let swizzledMethod = class_geTinstanceMethod(person,swizzledMethod) } extension Person { open override class func initialize() { // make sure this isn't a subclass guard self === Person.self else { return } swizzling(self) } // MARK: - Method Swizzling func proj_foo(_ bar: Bool) { self.proj_foo(bar) let className = NSStringFromClass(type(of: self)) print("class: \(className)") } }
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