iOS 按鈕倒計時功能

標籤：uibutton   按鈕   關閉   queue   string   text   驗證   glob   blog   

iOS 按鈕倒計時功能， 建議把按鈕換成label，這樣會避免讀秒時閃爍

 1  __block int time = 60; 2         __block UIButton *verifybutton = _GetverificationBtn; 3         verifybutton.enabled = NO; 4         dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); 5         dispatch_source_t _timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0,queue); 6         dispatch_source_set_timer(_timer,dispatch_walltime(NULL, 0),1.0*NSEC_PER_SEC, 0); //每秒執行 7         dispatch_source_set_event_handler(_timer, ^{ 8             if(time<=0){ //倒計時結束，關閉 9                 dispatch_source_cancel(_timer);10                 dispatch_async(dispatch_get_main_queue(), ^{11                     //設定介面的按鈕顯示 根據自己需求設定12                     [verifybutton setTitle:@"擷取驗證碼" forState:UIControlStateNormal];13                     verifybutton.enabled = YES;14                 });15             }else{16                 dispatch_async(dispatch_get_main_queue(), ^{17                     //設定介面的按鈕顯示 根據自己需求設定18                     verifybutton.backgroundColor = [UIColor grayColor];19                     NSString *strTime = [NSString stringWithFormat:@"擷取驗證碼(%d)",time];20                     [verifybutton setTitle:strTime forState:UIControlStateNormal];21                     verifybutton.titleLabel.textColor = [UIColor whiteColor];22                 });23                 time--;24             }25         });26         dispatch_resume(_timer); 

 

iOS 按鈕倒計時功能