iOS 短信验证码倒计时按钮的实现

时间:2021-09-21 10:03:12

验证码倒计时按钮的应用是非常普遍的,本文介绍了IOS实现验证码倒计时功能,点击获取验证码,进入时间倒计时,感兴趣的小伙伴们可以参考一下:

实现思路:

  • 创建按钮,添加点击方法;

  • 用NSTimer定时器,每秒执行一次,定时改变Button的title,改变Button的样式,设置Button不可点击;

  • 若倒计时结束,定时器关闭,并改变Button的样式,可以点击;

代码如下:

在按钮的点击事件里调用该方法

    

-(void)openCountdown{

__block NSInteger time = 59;

dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);

dispatch_source_t _timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue);

dispatch_source_set_timer(_timer,dispatch_walltime(NULL, 0),1.0*NSEC_PER_SEC, 0);

dispatch_source_set_event_handler(_timer, ^{

if(time <= 0){

dispatch_source_cancel(_timer);

dispatch_async(dispatch_get_main_queue(), ^{

[self.authCodeBtn setTitle:@"重新发送" forState:UIControlStateNormal];

[self.authCodeBtn setTitleColor:[UIColor colorFromHexCode:@"FB8557"]

forState:UIControlStateNormal];

self.authCodeBtn.userInteractionEnabled = YES;

});

}else{

int seconds = time % 60;

dispatch_async(dispatch_get_main_queue(), ^{

[self.authCodeBtn setTitle:[NSString stringWithFormat:@"重新发送(%.2d)", seconds] forState:UIControlStateNormal];

[self.authCodeBtn setTitleColor:[UIColor colorFromHexCode:@"979797"]

forState:UIControlStateNormal];

self.authCodeBtn.userInteractionEnabled = NO;

});

time--;

}

});

dispatch_resume(_timer);

}

注意点:

 

我们在创建Button时,要设置Button的样式,
当type为:UIButtonTypeCustom时,是读秒的效果。
当type为:其他时,是一闪一闪的效果。