iOS 按钮倒计时功能

iOS 按钮倒计时功能, 建议把按钮换成label,这样会避免读秒时闪烁

  __block int time = ;
__block UIButton *verifybutton = _GetverificationBtn;
verifybutton.enabled = NO;
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, );
dispatch_source_t _timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, , ,queue);
dispatch_source_set_timer(_timer,dispatch_walltime(NULL, ),1.0*NSEC_PER_SEC, ); //每秒执行
dispatch_source_set_event_handler(_timer, ^{
if(time<=){ //倒计时结束,关闭
dispatch_source_cancel(_timer);
dispatch_async(dispatch_get_main_queue(), ^{
//设置界面的按钮显示 根据自己需求设置
[verifybutton setTitle:@"获取验证码" forState:UIControlStateNormal];
verifybutton.enabled = YES;
});
}else{
dispatch_async(dispatch_get_main_queue(), ^{
//设置界面的按钮显示 根据自己需求设置
verifybutton.backgroundColor = [UIColor grayColor];
NSString *strTime = [NSString stringWithFormat:@"获取验证码(%d)",time];
[verifybutton setTitle:strTime forState:UIControlStateNormal];
verifybutton.titleLabel.textColor = [UIColor whiteColor];
});
time--;
}
});
dispatch_resume(_timer);
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