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[操作系统]iOS验证码倒计时(GCD实现)


+ (void)verificationCode:(void(^)())blockYes blockNo:(void(^)(id time))blockNo {  __block int timeout=60; //倒计时时间  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); //每秒执行  dispatch_source_set_event_handler(_timer, ^{    if(timeout<=0){ //倒计时结束,关闭      dispatch_source_cancel(_timer);      dispatch_async(dispatch_get_main_queue(), ^{        //设置界面的按钮显示 根据自己需求设置        blockYes();      });    }else{      //      int minutes = timeout / 60;      int seconds = timeout % 60;      NSString *strTime = [NSString stringWithFormat:@"%.2d", seconds];      dispatch_async(dispatch_get_main_queue(), ^{        //设置界面的按钮显示 根据自己需求设置        NSLog(@"____%@",strTime);        blockNo(strTime);              });      timeout--;    }  });  dispatch_resume(_timer);}