__block int timeout=60;
//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
codeLabel.text = @"获取验证码";
codeLabel.userInteractionEnabled = YES;
});
}else{
int seconds = timeout % 60;
NSString *strTime = [NSString stringWithFormat:@"%d", seconds];
if ([strTime isEqualToString:@"0"]) {
strTime = [NSString stringWithFormat:@"%d",60];
}
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];
codeLabel.text = [NSString stringWithFormat:@"%@", [NSString stringWithFormat:@"%@秒",strTime]];
[UIView commitAnimations];
codeLabel.userInteractionEnabled = NO;
});
timeout--;
}
});
dispatch_resume(_timer);