这来自传感器答案

【问题标题】：That comes from the sensor这来自传感器
【发布时间】：2016-11-29 13:01:51
【问题描述】：

例如，当相机运行时，我需要在控制台中访问传感器信息：

  NSLog(@"value senson camera");

【问题讨论】：

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标签： ios xcode camera sensors

【解决方案1】：

这个问题已经回答了调用方法 AVCaptureSession 来访问摄像头然后使用这个方法来访问传感器

创建 NSSrting 传感器

@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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【讨论】：

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