+ (void)load{
  [super load];
  
  static dispatch_once_t onceToken;
  dispatch_once(&onceToken, ^{
    // 假如要打開controller的統(tǒng)計 ,則把下面這行代碼打開
    __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]; //由于方法已經(jīng)被交換,這里調(diào)用的實際上是viewDidAppear:方法
  
　　 //設(shè)置不允許發(fā)送數(shù)據(jù)的Controller
  NSArray *filter = @[@"UINavigationController",@"UITabBarController"];
  NSString *className = NSStringFromClass(self.class);
  if ([filter containsObject:className]) return ; //如果該Controller在不允許發(fā)送log的列表里,則不能繼續(xù)往下走
  
  if ([self.title isKindOfClass:[NSString class]] && self.title.length > 0){ //有標題的才符合我的要求
    // 這里發(fā)送log
  }

}

@implementation UIApplication (GBHTracer)
+ (void)load{
  [super load];
  
  static dispatch_once_t onceToken;
  dispatch_once(&onceToken, ^{ //只執(zhí)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{
  //應(yīng)用啟動時為所欲為!
}

@end