// 開始倒計時
- (void)startTime {
__block int timeout=59; //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（倒計時結束後調用）
[self.getNumber setTitle:@"獲取驗證碼" forState:UIControlStateNormal];
//設置不可點擊
self.getNumber.userInteractionEnabled = YES;
// self.getNumber.backgroundColor = [UIColor orangeColor];
});
}else{
// int minutes = timeout / 60; //這裏註釋掉了，這個是用來測試多於60秒時計算分鐘的。
int seconds = timeout % 60;
NSString *strTime = [NSString stringWithFormat:@"%d", 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);
[self.getNumber setTitle:[NSString stringWithFormat:@"%@秒",strTime] forState:UIControlStateNormal];
//設置可點擊
self.getNumber.userInteractionEnabled = NO;
// self.getNumber.backgroundColor = [UIColor lightGrayColor];
});
timeout--;
}
});
dispatch_resume(_timer);
}