#pragma mark -  驗證碼倒計時驗證碼60s（連續快速點擊）
/** 驗證碼倒計時UI繪制 */
- (void)drawVerifyCodeCountdownUI:(UIButton *)sender {
    __block int timeout = 60; //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
                [sender setTitle:@"重新獲取" forState:UIControlStateNormal];
                sender.userInteractionEnabled = YES;
//                sender.backgroundColor = [UIColor colorWithWhite:0.3 alpha:0.5];
            });
        } else {
            int seconds = timeout;
            NSString *strTime = [NSString stringWithFormat:@"%d", seconds];
            dispatch_async(dispatch_get_main_queue(), ^{
                //讓按鈕變為不可點擊的灰色
//                sender.backgroundColor = [UIColor grayColor];
                sender.userInteractionEnabled = NO;
                //設置界面的按鈕顯示 根據自己需求設置
                [UIView beginAnimations:nil context:nil];
                [UIView setAnimationDuration:1];
                [sender setTitle:[NSString stringWithFormat:@"%@s",strTime] forState:UIControlStateNormal];
                [UIView commitAnimations];
            });
            timeout--;
        }
    });
    dispatch_resume(_timer);
}