iOS驗證碼倒計時(GCD實現),ios驗證碼倒計時gcd
+ (void)verificationCode:(void(^)())blockYes blockNo:(void(^)(id time))blockNo { __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(), ^{ //設定介面的按鈕顯示 根據自己需求設定 blockYes(); }); }else{ // int minutes = timeout / 60; int seconds = timeout % 60; NSString *strTime = [NSString stringWithFormat:@"%.2d", seconds]; dispatch_async(dispatch_get_main_queue(), ^{ //設定介面的按鈕顯示 根據自己需求設定 NSLog(@"____%@",strTime); blockNo(strTime); }); timeout--; } }); dispatch_resume(_timer);}