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//倒计时 xx秒后发送
__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
[_obtianCodeButton setTitle:@"发送验证码" forState:UIControlStateNormal];
_obtianCodeButton.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
// NSLog(@"____%@",strTime);
[_obtianCodeButton setTitle:[NSString stringWithFormat:@"%@",strTime] forState:UIControlStateNormal];
_obtianCodeButton.userInteractionEnabled = NO;
});
timeout--;
}
});
dispatch_resume(_timer);
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原文地址：http://www.cnblogs.com/-ios/p/4669667.html
