一个倒计时的button

//在button的点击事件里

-(void)MassageButton{

if ([self validateMobile:self.TphoneNumer] ) {

[self startTime];

if (self.massagebutton.selected) {

//根据电话号码发送请求

if ([self validateMobile:self.TphoneNumer]) {

[[ZQNetworkingTools shareInstance ]getlMassageSuccess:^(id responseObject) {

[self jumpwith:@"短信验证码发送成功300秒可用"];

} failure:^(NSError *error) {

[self jumpwith:@"短信验证码发送失败"];

} withMoboe:self.TphoneNumer];

}

}

}else{

zqShowAlert(@"账号", @"请确认为可用手机号码");

}

}

-(void)startTime{

__block int timeout= 59; //倒计时时间

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); //每秒执行

dispatch_source_set_event_handler(_timer, ^{

if(timeout<=0){ //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

[ self.massagebutton setTitle:@"获取" forState:UIControlStateNormal];

self.massagebutton.backgroundColor = BLUE;

self.massagebutton.userInteractionEnabled = YES;

});

}else{

//            int minutes = timeout / 60;

int seconds = timeout % 60;

NSString *strTime = [NSString stringWithFormat:@"%.2d", seconds];

dispatch_async(dispatch_get_main_queue(), ^{

//设置界面的按钮显示 根据自己需求设置

[UIView beginAnimations:nil context:nil];

[UIView setAnimationDuration:1];

self.massagebutton.backgroundColor = GRAY;

[ self.massagebutton setTitle:[NSString stringWithFormat:@"%@秒重发",strTime] forState:UIControlStateNormal];

[UIView commitAnimations];

self.massagebutton.userInteractionEnabled = NO;

});

timeout--;

}

});

dispatch_resume(_timer);

}