iOS 短信验证的倒计时

定义两个属性//减少的秒数

@property(nonatomic,assign)NSIntegersecondsCountDown;//计时器

@property(nonatomic,strong)NSTimer*countDownTimer;

在发送验证码成功的时机里面

//设置不可点击并开启计时器

[selfsetRequestSmsCodeBtnCountDown];

//设置计时器并倒计时self.getButton是发送验证码那个button

-(void

)setRequestSmsCodeBtnCountDown{

[

self.getButtonsetEnabled:NO];//关闭交互

self.getButton.backgroundColor= [UIColorcolorWithRed:153.0/255green:153.0/255blue:153.0/255alpha:1.0];//灰色背景

self.secondsCountDown=60;//倒计时60秒

//设置并开启计时器

self.countDownTimer= [NSTimerscheduledTimerWithTimeInterval:1target:selfselector:@selector(countDownTimeWithSeconds:)userInfo:nilrepeats:YES

];

[

_countDownTimerfire

];

}

//计时器的执行方法

-(

void)countDownTimeWithSeconds:(NSTimer

*)timerInfo{

//判断当前秒数如果秒数为0,重新设置button为可点击状态

if(_secondsCountDown==0

) {

[

self.getButtonsetEnabled:YES

];

self.getButton.backgroundColor= [UIColorredColor

];

[

self.getButtonsetTitle:@"获取验证码"forState:UIControlStateNormal

];

[

_countDownTimerinvalidate

];

}

else

{

//如果不为0设置button字为当前剩余秒数,并继续减少

[

self.getButtonsetTitle:[[NSNumbernumberWithLong:_secondsCountDown]description]forState:UIControlStateNormal

];

self.secondsCountDown

--;

}

}