1.普通用法

1.weakSelf：block内部使用一次，引用计数不加1，self释放，weakSelf = nil

LoginViewController *loginVC = [[LoginViewController alloc]init];
__weak __typeof(self) weakSelf = self;
loginVC.loginFinished = ^(){
    [weakSelf doSomeThing];//使用多次的话，就需要strongSelf
};
[self.navigationController pushViewController:loginVC animated:YES];

2.strongSelf

LoginViewController *loginVC = [[LoginViewController alloc]init];
__weak __typeof(self) weakSelf = self;//block内部多次使用
loginVC.loginFinished = ^(){
    __strong __typeof(self) strongSelf = weakSelf;
    [strongSelf doSomeThing];
    [strongSelf doOtherThing];
};
[self.navigationController pushViewController:loginVC animated:YES];

2.宏定义用法

1.定义宏：使用前提条件，定义一下宏

#define WeakSelf(weakSelf)      __weak __typeof(&*self)    weakSelf  = self;
#define StrongSelf(strongSelf)  __strong __typeof(&*self) strongSelf = weakSelf;

//weakSelf宏用法
/**修改用户密码*/
- (void)requestForModyPasswordWithCode:(NSString*)messageCode mobile:(NSString*)mobile newPasswrod:(NSString*)newPassword {

    WeakSelf(weakSelf)
    [[TJProgressHud shareInstance]showProgressView:@"正在修改密码..."];
    [[TJNetService shareInstance] modifyPasswordWithCode:messageCode mobile:mobile passowrd:newPassword Success:^(id result) {
        /**
          .
          .
        */
        [weakSelf.navigationController popToRootViewControllerAnimated:YES];
    } Failure:^(id result) {
        [[TJProgressHud shareInstance]removeSVProgress];
        [TJToastView showWithText:@"修改密码失败，请稍候尝试" topOffset:MainScreenSize.height/2.0];
    }];
}

//strongSelf宏用法
/**发送短信验证码*/
- (void)requestForSendMessageCodeByPhoneNumber:(NSString*)mobile{
    WeakSelf(weakSelf)
    [[TJNetService shareInstance] sendCodeOnForgetPwdWithMobile:mobile  Success:^(id result) {
        StrongSelf(strongSelf)
        [strongSelf.evbtnSendMessage setUserInteractionEnabled:NO];
        NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:1.0
                                                          target:strongSelf
                                                        selector:@selector(_efUpdateButtonStatus:)
                                                        userInfo:nil repeats:YES];
        [timer fire];
    } Failure:^(id result) {
        [TJToastView showWithText:@"验证码发送失败,请稍后尝试" topOffset:140];
    }];
}

- (void)_efUpdateButtonStatus:(NSTimer*)timer{
  //do someThing...
}