Question

我想在iOS中使用Hook委托（协议）方法，谁能告诉我该怎么做？

例如钩子方法applicationDidFinishLaunching:

我是这样做的，但它不起作用......

extern IMP original_UIApplication_applicationDidFinishLaunching;
extern void replaced_UIApplication_applicationDidFinishLaunching(UIApplication<UIApplicationDelegate> * self, SEL cmd, UIApplication* application); 

MSHookMessageEx(objc_getMetaClass("UIApplication"),
                @selector(applicationDidFinishLaunching:), 
                (IMP)replaced_UIApplication_applicationDidFinishLaunching, 
                (IMP *)&original_UIApplication_applicationDidFinishLaunching);

Answer 1

applicationDidFinishLaunching是由应用程序DELEGATE实现的方法，而不是UIApplication本身。绝对没有理由需要在UIApplication上调整方法。只需在您的代理中实现这些方法。

对于要覆盖Apple提供的类中的方法的情况，您可以通过在其上创建类别来实现。添加的类别方法将通过相同的方法签名覆盖系统方法。

Answer 2

你喋喋不休地交换了实现协议的类的方法。就像这样：

    // Protocol Method Exchange
    int numClasses = objc_getClassList(NULL, 0);

    Class *list = (Class *)malloc(sizeof(Class) * numClasses);
    objc_getClassList(list, numClasses);
    for (int i = 0; i < numClasses; i++) {
        if (class_conformsToProtocol(list[i], @protocol(TowstViewDelegate)) &&
            class_getInstanceMethod(list[i], @selector(submit))) {
            NSLog(@"%@ sumit have exchanged",NSStringFromClass(list[i]));
            jm_swizzleSelector(list[i], @selector(submit), @selector(hk_submit));
        }
    }
    free(list);
    NSLog(@"Exchange END");

在iPhone中连接协议

2 个答案: