iOS-傳送簡訊驗證碼倒計時

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/** 發送手機驗證碼 */-(void)startSenderYzmMessage{    __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(), ^{                //此處倒計時完畢  回複正常狀態            });        }else{            // int minutes = timeout / 60;            int seconds = timeout % 60;            NSString *strTime = [NSString stringWithFormat:@"%.2d", seconds];            if ([strTime isEqualToString:@"00"]) {                strTime = @"60";            }            dispatch_async(dispatch_get_main_queue(), ^{                //此處倒計時狀態，更新倒計時顯示            });            timeout--;        }    });    dispatch_resume(_timer);}

 

iOS-傳送簡訊驗證碼倒計時