最近看了好多有關于button倒計時的demo,單純感覺那些人把一個很簡單的事件寫的那么復雜,不知道是顯示自己,還是不會簡單方法,讓一些新手們根本看不懂,下面單純的這個方法,直接復制到button點擊事件里面,就可以直接使用了,簡單粗暴,復制之后會報錯,大家記得把button換成自己的button就好了
```
__block int timeout=30; //倒計時時間
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); //每秒執行
dispatch_source_set_event_handler(_timer, ^{
if(timeout<=0){ //倒計時結束，關閉
dispatch_source_cancel(_timer);
dispatch_async(dispatch_get_main_queue(), ^{
//設置界面的按鈕顯示 根據自己需求設置
[l_timeButton setTitle:@"發送驗證碼" forState:UIControlStateNormal];
l_timeButton.userInteractionEnabled = YES;
});
}else{
//? ? ? ? ? ? int minutes = timeout / 60;
int seconds = timeout % 60;
NSString *strTime = [NSString stringWithFormat:@"%.2d", seconds];
dispatch_async(dispatch_get_main_queue(), ^{
//設置界面的按鈕顯示 根據自己需求設置
NSLog(@"____%@",strTime);
[l_timeButton setTitle:[NSString stringWithFormat:@"%@秒后重新發送",strTime] forState:UIControlStateNormal];
l_timeButton.userInteractionEnabled = NO;
});
timeout--;
}
});
dispatch_resume(_timer);
```
