AVCaptureStillImageOutput
@property(nonatomic, readonly) NSArray *connections;
- (AVCaptureConnection *)connectionWithMediaType:(NSString *)mediaType NS_AVAILABLE(10_7, 5_0);
- (AVMetadataObject *)transformedMetadataObjectForMetadataObject:(AVMetadataObject *)metadataObject connection:(AVCaptureConnection *)connection NS_AVAILABLE_IOS(6_0);
- (CGRect)metadataOutputRectOfInterestForRect:(CGRect)rectInOutputCoordinates NS_AVAILABLE_IOS(7_0);
- (CGRect)rectForMetadataOutputRectOfInterest:(CGRect)rectInMetadataOutputCoordinates NS_AVAILABLE_IOS(7_0);
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