UIButton添加倒計時

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最近一個項目有擷取手機簡訊跟郵箱驗證碼功能, 所以要加一個UIButton倒計時功能

例子代碼如下:

 1 - //擷取驗證碼按鈕 2 - - (IBAction)getButtonClick:(UIButton *)sender; 3 - 4 - #pragma mark - 擷取驗證碼 5 - - (IBAction)getButtonClick:(UIButton *)sender 6 - { 7 -     //正常狀態下的背景顏色 8 -     UIColor *mainColor = [UIColorcolorWithRed:84/255.0green:180/255.0blue:98/255.0alpha:1.0f]; 9 -     //倒計時狀態下的顏色10 -     UIColor *countColor = [UIColorlightGrayColor];11 -     [selfsetTheCountdownButton:sender startWithTime:5title:@"擷取驗證碼"countDownTitle:@"s"mainColor:mainColor countColor:countColor];12 - }13 -14 - #pragma mark - button倒計時15 - - (void)setTheCountdownButton:(UIButton *)button startWithTime:(NSInteger)timeLine title:(NSString *)title countDownTitle:(NSString *)subTitle mainColor:(UIColor *)mColor countColor:(UIColor *)color {16 -     //倒計時時間17 -     __block NSInteger timeOut = timeLine;18 -     dispatch_queue_t queue =dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0);19 -     dispatch_source_t _timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER,0, 0, queue);20 -     //每秒執行一次21 -     dispatch_source_set_timer(_timer,dispatch_walltime(NULL,0), 1.0 * NSEC_PER_SEC,0);22 -     dispatch_source_set_event_handler(_timer, ^{23 -24 -         //倒計時結束，關閉25 -         if (timeOut == 0) {26 -             dispatch_source_cancel(_timer);27 -             dispatch_async(dispatch_get_main_queue(), ^{28 -                 button.backgroundColor = mColor;29 -                 [button setTitle:titleforState:UIControlStateNormal];30 -                 button.userInteractionEnabled =YES;31 -             });32 -         } else {33 -             int seconds = timeOut % 60;34 -             NSString *timeStr = [NSStringstringWithFormat:@"%0.1d", seconds];35 -             dispatch_async(dispatch_get_main_queue(), ^{36 -                 button.backgroundColor = color;37 -                 [button setTitle:[NSStringstringWithFormat:@"%@%@",timeStr,subTitle]forState:UIControlStateNormal];38 -                 button.userInteractionEnabled =NO;39 -             });40 -             timeOut--;41 -         }42 -     });43 -     dispatch_resume(_timer);44 - }

 

UIButton添加倒計時