block：
typedef void(^GetBrightnessBlock)(CGFloat brightness);//用来向外部传递捕获到的亮度值以便于识别何时开启闪光灯，
typedef void(^ScanBlock)(NSArray *metadataObjects);//捕获到的结果集合
//亮度回调
- (void)brightnessChange:(GetBrightnessBlock)getBrightnessBlock;
//扫描结果
- (void)scanResult:(ScanBlock)scanBlock;
- (void)startRunning {
[_session startRunning];
}
- (void)stopRunning {
[_session stopRunning];
}
需要遵循：/**
重置根据光线强弱值打开手电筒 delegate方法
*/
- (void)resetSampleBufferDelegate;
/**
取消根据光线强弱值打开手电筒的delegate方法
*/
- (void)cancelSampleBufferDelegate;
- (void)resetSampleBufferDelegate {
[_videoDataOutput setSampleBufferDelegate:self queue:dispatch_get_main_queue()];
}
- (void)cancelSampleBufferDelegate {
[_videoDataOutput setSampleBufferDelegate:nil queue:dispatch_get_main_queue()];
}
#pragma mark 播放扫描提示音
- (void)playSoundName:(NSString *)name {
NSString *audioFile = [[NSBundle mainBundle] pathForResource:name ofType:nil];
NSURL *fileUrl = [NSURL fileURLWithPath:audioFile];
SystemSoundID soundID = 0;
AudioServicesCreateSystemSoundID((__bridge CFURLRef)(fileUrl), &soundID);
AudioServicesAddSystemSoundCompletion(soundID, NULL, NULL, soundCompleteCallback, NULL);
AudioServicesPlaySystemSound(soundID); // 播放音效
}
void soundCompleteCallback(SystemSoundID soundID, void *clientData){
}
注：这里只是截取部分重要代码，具体功能我会将代码放到GitHub上，代码里注释也写的很明白
使用功能
开启、结束定时器
开启、关闭session会话
启用、移除sampleBuffer代理
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
[self.scanView addTimer];
[_scanManager startRunning];
[_scanManager resetSampleBufferDelegate];
}
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
[self.scanView removeTimer];
[_scanManager stopRunning];
[_scanManager cancelSampleBufferDelegate];
}
