iOS 每日一记之 -----点击验证码按钮 获取验证码

1.首先创建一个获取验证码的按钮 按钮绑定方法 然后实现getAuthCodeBtnClick的方法

// 初始化获取验证码按钮

        self.getAuthCodeBtn = [[UIButton alloc] initWithFrame:CGRectMake(SCREEN_WIDTH - 24 - 135, 57, 135, 36)];

        [self.getAuthCodeBtn setTitle:@"Get verification code" forState:UIControlStateNormal];
        [self.getAuthCodeBtn addTarget:self action:@selector(getAuthCodeBtnClick) forControlEvents:UIControlEventTouchUpInside];
        self.getAuthCodeBtn.layer.masksToBounds = YES;
        self.getAuthCodeBtn.titleLabel.font = FontNeveLightWithSize(12.0);
        self.getAuthCodeBtn.layer.borderWidth = 1;
        [self.getAuthCodeBtn setTitleColor:AppBlueColor forState:UIControlStateNormal];
        [self.getAuthCodeBtn setTitleColor:HintTextColor forState:UIControlStateDisabled];
        self.getAuthCodeBtn.backgroundColor = [UIColor whiteColor];

        [whiteView addSubview:self.getAuthCodeBtn];

        [self updateButtonState:ButtonStateClickable];

2.实现getAuthCodeBtn的点击方法

/ 点击获取验证码按钮
- (void)getAuthCodeBtnClick {
    NSLog(@"%@", NSStringFromSelector(_cmd));
    NSString *phoneNumber = [self.phoneNumberTextField.text stringByReplacingOccurrencesOfString:@" " withString:@""];
    // 验证手机号码
    if (phoneNumber.length == 0) {
        [self showHUDErrorWithText:@"Please enter your phone number"];
    } else {
        [self.authCodeTextField becomeFirstResponder];
        // 开始倒数计时
        [self startWithSeconds:60];
        [self updateButtonState:ButtonStateDisable];
        
        NSString *countryCode = self.countryCodeLabel.text;
        phoneNumber = [NSString stringWithFormat:@"%@ %@", countryCode, phoneNumber];
        
        [HttpManager getAuthCodeByPhoneNumber:phoneNumber chc_type:@"1" success:^(AFHTTPRequestOperation *operation, id responseObject) {
            userRegisterInfo = (NSDictionary *)responseObject[@"result"];
            NSInteger rtnCode = [responseObject[@"code"] integerValue];
            if (rtnCode == 0) {
                NSString *msg = [NSString stringWithFormat:@"Verification code sent to your %@ Phone Number", phoneNumber];
                [self showHUDDoneWithText:msg];
//                self.authCodeTextField.text = userRegisterInfo[@"ci_password"];
            } else if (rtnCode == 1) {// 已经注册过了
                [self resetTimer];
                UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:nil message:@"This number is already registered to a NiHao account. Do you want to log in to NiHao now?" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"OK", nil];
                [alertView show];
            } else {
                [self resetTimer];
                [self processServerErrorWithCode:rtnCode andErrorMsg:[responseObject objectForKey:@"message"]];
            }
        } failBlock:^(AFHTTPRequestOperation *operation, NSError *error) {
            NSLog(@"Error: %@", error);
            [self showHUDNetError];
            [self stop];
        }];
    }
}

3.启动定时器

/ 开始倒数计时
-(void)startWithSeconds:(int)totalSecond {
    _totalSeconds = totalSecond;
    _second = totalSecond;
    
    _timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(timerStart:) userInfo:nil repeats:YES];
    _startDate = [NSDate date];
    [[NSRunLoop currentRunLoop] addTimer:_timer forMode:NSRunLoopCommonModes];
}

4定时器的执行方法

-(void)timerStart:(NSTimer *)theTimer {
    double deltaTime = [[NSDate date] timeIntervalSinceDate:_startDate];
    _second = _totalSeconds - (int)(deltaTime + 0.5) ;
    
    if (_second < 0.0) {
        [self stop];
    } else {
        NSString *title = [NSString stringWithFormat:@"%d seconds", _second];
        [self.getAuthCodeBtn setTitle:title forState:UIControlStateNormal];
        [self.getAuthCodeBtn setTitle:title forState:UIControlStateDisabled];
    }
}

5.定时器的关闭和重启代码

// 停止倒数计时
- (void)stop {
    [self stopTimerWithText:@"Resend Code"];
}

// 重置倒数计时
- (void)resetTimer {
    [self stopTimerWithText:@"Get verification code"];
}

- (void)stopTimerWithText:(NSString *)text {
    if (_timer) {
        if ([_timer respondsToSelector:@selector(isValid)]) {
            if ([_timer isValid]) {
                [_timer invalidate];
                _second = _totalSeconds;
                
                [self.getAuthCodeBtn setTitle:text forState:UIControlStateNormal];
                [self.getAuthCodeBtn setTitle:text forState:UIControlStateDisabled];
                [self updateButtonState:ButtonStateClickable];
            }
        }
    }
}