这是用Objective-C编写的方法困惑代码。我很难在Swift中进行转换。

void MPApplicationDidRegisterForRemoteNotificationsWithDeviceToken(id self, SEL _cmd, UIApplication *application, NSData *deviceToken) {
    [[MPPush shared] appRegisteredForRemoteNotificationsWithDeviceToken:deviceToken];

    IMP original = [MPAppDelegateProxy originalImplementation:_cmd class:[self class]];
    if (original)
        ((void(*)(id, SEL, UIApplication *, NSData*))original)(self, _cmd, application, deviceToken);
}

Swiftify无法正确转换以上代码。

我试图这样做,但是我不确定如何在Swift swizzling方法中传递参数并使用上面的确切参数。这是我在Swift中转换以上代码的失败尝试(代码甚至无法编译):
var MPApplicationDidRegisterForRemoteNotificationsWithDeviceToken: Void {
        //     TODO:   MPPush.shared.app

        let original = MPAppDelegateProxy.proxyAppDelegate.originalImplementation(selector: cmd, forClass: type(of: self))
    }(self: Any, _cmd: Selector, application: UIApplication, deviceToken: Data)

最佳答案

扩展类(class):

extension YourClassName {
    static let classInit: () -> () = {
        let originalSelector = #selector(originalFunction)
        let swizzledSelector = #selector(swizzledFunction)
        swizzle(YourClassName.self, originalSelector, swizzledSelector)
    }

    @objc func swizzledFunction() {
        //Your new implementation
    }
}

您的类(YourClassName)应该继承自NSObject,而originalSelector应该是dynamic方法。
swizzle是一个交换实现的闭包:
private let swizzle: (AnyClass, Selector, Selector) -> () = { fromClass, originalSelector, swizzledSelector in
    guard
        let originalMethod = class_getInstanceMethod(fromClass, originalSelector),
        let swizzledMethod = class_getInstanceMethod(fromClass, swizzledSelector)
        else { return }
    method_exchangeImplementations(originalMethod, swizzledMethod)
}

您可以在要进行混淆处理的类中定义swizzle。例如AppDelegate类定义。然后在AppDelegate.init()中进行扫描:
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
    override init() {
        super.init()
        YourClassName.classInit()
    }
}

例子

这是一个令人毛骨悚然的具体示例,它的exchanges the implementation有两种方法采用一个参数:
class Example: NSObject {
    @objc dynamic func sayHi(to name: String) {
        print("Hi", name)
    }
}

extension Example {
    public class func swizzleMethod() {
        guard
            let originalMethod = class_getInstanceMethod(Example.self, #selector(Example.sayHi(to:))),
            let swizzledMethod = class_getInstanceMethod(Example.self, #selector(Example.sayHello(to:)))
            else { return }
        method_exchangeImplementations(originalMethod, swizzledMethod)
    }
    @objc func sayHello(to name: String) {
        print("Hello", name)
    }
}

Example.swizzleMethod()

let a = Example()
a.sayHi(to: "Nitish")        //Hello Nitish

关于ios - swift -方法令人毛骨悚然,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/52366310/

10-14 23:23
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