這來自傳感器

Question

我需要在控制檯訪問傳感器信息時，相機運行例如：

NSLog(@"value senson camera"); 

Answer 1

這個問題已經回答 Invoke方法AVCaptureSession訪問攝像機然後使用此方法訪問傳感器

創建NSSrting傳感器

@property (strong,nonatomic) NSString *Sensor; 



#pragma mark - Styling methods 

- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection: (AVCaptureConnection *)connection 
{ 
CFDictionaryRef metadataDict = CMCopyDictionaryOfAttachments(NULL, 
                   sampleBuffer, kCMAttachmentMode_ShouldPropagate); 
NSDictionary *metadata = [[NSMutableDictionary alloc] 
          initWithDictionary:(__bridge NSDictionary*)metadataDict]; 
CFRelease(metadataDict); 
NSDictionary *exifMetadata = [[metadata objectForKey:(NSString *)kCGImagePropertyExifDictionary] mutableCopy]; 
float brightnessValue = [[exifMetadata objectForKey:(NSString *)kCGImagePropertyExifBrightnessValue] floatValue]; 

//HERE IS YOU SENSOR INFO 
_Sensor = [[NSNumber numberWithFloat:brightnessValue] stringValue]; 
NSLog(@"VALUE SENSOR %@",_Sensor); 

dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, 0.5 * NSEC_PER_SEC); 
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){ 


     if ([_Sensor isEqualToString:@"YOU VALUE"]) { 

      //YOU CODE HERE 

     } 

}); 


} 

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