iOS开发，hook系统Objective-C的函数

我们都知道在windows下可以通过API轻松的hook很多消息，IOS也可以实现hook的功能。

建立一个

TestHookObject类

//
//  TestHookObject.m
//  TestEntrance
//
//  Created by 张 卫平 on 13-6-27.
//  Copyright (c) 2013年 张 卫平. All rights reserved.
//

#import "TestHookObject.h"
#import <objc/objc.h>
#import <objc/runtime.h>

@implementation TestHookObject

// this method will just excute once
+ (void)initialize
{
         // 获取到UIWindow中sendEvent对应的method
         Method sendEvent = class_getInstanceMethod([UIWindow class], @selector(sendEvent:));
         Method sendEventMySelf = class_getInstanceMethod([self class], @selector(sendEventHooked:));
    
         // 将目标函数的原实现绑定到sendEventOriginalImplemention方法上
         IMP sendEventImp = method_getImplementation(sendEvent);
         class_addMethod([UIWindow class], @selector(sendEventOriginal:), sendEventImp, method_getTypeEncoding(sendEvent));
    
         // 然后用我们自己的函数的实现，替换目标函数对应的实现
         IMP sendEventMySelfImp = method_getImplementation(sendEventMySelf);
         class_replaceMethod([UIWindow class], @selector(sendEvent:), sendEventMySelfImp, method_getTypeEncoding(sendEvent));
    
}

 /*
    * 截获到window的sendEvent
    * 我们可以先处理完以后，再继续调用正常处理流程
    */
 - (void)sendEventHooked:(UIEvent *)event
{
         // do something what ever you want
         NSLog(@"haha, this is my self sendEventMethod!!!!!!!");
    
         // invoke original implemention
         [self performSelector:@selector(sendEventOriginal:) withObject:event];
 }
@end

在Appdelegate里面加入

- (IBAction)btnAction:(id)sender{
    NSLog(@"aaa");
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    // Override point for customization after application launch.
    self.viewController = [[[ViewController alloc] initWithNibName:@"ViewController" bundle:nil] autorelease];
    self.window.rootViewController = self.viewController;
    [self.window makeKeyAndVisible];
    
    //hook UIWindow‘s SendEvent method
    TestHookObject *hookSendEvent = [[TestHookObject alloc] init];
    [hookSendEvent release];
    
    UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
    btn.center = CGPointMake(160, 240);
    btn.backgroundColor = [UIColor redColor];
    [btn addTarget:self action:@selector(btnAction:) forControlEvents:UIControlEventAllEvents];
    [self.window addSubview:btn];
    [btn release];
    
    
    return YES;
}

试着跑起来看看吧。

参考:http://www.cnblogs.com/smileEvday/archive/2013/02/28/Hook.html