IOS App 无代码入侵的方法hook详细介绍

+ (void)load{
  [super load];
  
  static dispatch_once_t onceToken;
  dispatch_once(&onceToken, ^{
    // 假如要打开controller的统计 ,则把下面这行代码打开
    __gbh_tracer_swizzleMethod([self class], @selector(viewDidAppear:), @selector(__gbh_tracer_viewDidAppear:));
  });
}

void __gbh_tracer_swizzleMethod(Class class, SEL originalSelector, SEL swizzledSelector){
  Method originalMethod = class_getInstanceMethod(class, originalSelector);
  Method swizzledMethod = class_getInstanceMethod(class, swizzledSelector);
  
  BOOL didAddMethod =
  class_addMethod(class,
          originalSelector,
          method_getImplementation(swizzledMethod),
          method_getTypeEncoding(swizzledMethod));
  
  if (didAddMethod) {
    class_replaceMethod(class,
              swizzledSelector,
              method_getImplementation(originalMethod),
              method_getTypeEncoding(originalMethod));
  } else {
    method_exchangeImplementations(originalMethod, swizzledMethod);
  }
}

- (void)__gbh_tracer_viewDidAppear:(BOOL)animated{
  [self __gbh_tracer_viewDidAppear:animated]; //由于方法已经被交换,这里调用的实际上是viewDidAppear:方法
  
　　 //设置不允许发送数据的Controller
  NSArray *filter = @[@"UINavigationController",@"UITabBarController"];
  NSString *className = NSStringFromClass(self.class);
  if ([filter containsObject:className]) return ; //如果该Controller在不允许发送log的列表里,则不能继续往下走
  
  if ([self.title isKindOfClass:[NSString class]] && self.title.length > 0){ //有标题的才符合我的要求
    // 这里发送log
  }

}

@implementation UIApplication (GBHTracer)
+ (void)load{
  [super load];
  
  static dispatch_once_t onceToken;
  dispatch_once(&onceToken, ^{ //只执行一次就可以了
    [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(__gbh_tracer_applicationDidFinishLaunching:) name:UIApplicationDidFinishLaunchingNotification object:nil];
  });
}

+ (void)__gbh_tracer_applicationDidFinishLaunching:(NSNotification *)noti{
  //应用启动时为所欲为!
}

@end