src/iOSSnapshotTestCaseCore/Public/FBSnapshotTestCase.h [249:265]:
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              overallTolerance:(CGFloat)overallTolerance
                         error:(NSError **)errorPtr;

/**
 Performs the comparison or records a snapshot of the view if recordMode is YES.
 @param view The view to snapshot.
 @param referenceImagesDirectory The directory in which reference images are stored.
 @param imageDiffDirectory The directory in which failed image diffs are stored.
 @param identifier An optional identifier, used if there are multiple snapshot tests in a given -test method.
 @param overallTolerance The percentage difference to still count as identical - 0 mean pixel perfect, 1 means I don't care.
 @param errorPtr An error to log in an XCTAssert() macro if the method fails (missing reference image, images differ, etc).
 @returns YES if the comparison (or saving of the reference image) succeeded.
 */
- (BOOL)compareSnapshotOfView:(UIView *)view
     referenceImagesDirectory:(NSString *)referenceImagesDirectory
           imageDiffDirectory:(NSString *)imageDiffDirectory
                   identifier:(nullable NSString *)identifier
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src/iOSSnapshotTestCaseCore/Public/FBSnapshotTestCase.h [266:283]:
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             overallTolerance:(CGFloat)overallTolerance
                        error:(NSError **)errorPtr;

/**
 Performs the comparison or records a snapshot of the view if recordMode is YES.
 @param view The view to snapshot.
 @param referenceImagesDirectory The directory in which reference images are stored.
 @param imageDiffDirectory The directory in which failed image diffs are stored.
 @param identifier An optional identifier, used if there are multiple snapshot tests in a given -test method.
 @param perPixelTolerance The percentage a given pixel's R,G,B and A components can differ and still be considered 'identical'. Each color shade difference represents a 0.390625% change.
 @param overallTolerance The percentage difference to still count as identical - 0 mean pixel perfect, 1 means I don't care.
 @param errorPtr An error to log in an XCTAssert() macro if the method fails (missing reference image, images differ, etc).
 @returns YES if the comparison (or saving of the reference image) succeeded.
 */
- (BOOL)compareSnapshotOfView:(UIView *)view
     referenceImagesDirectory:(NSString *)referenceImagesDirectory
           imageDiffDirectory:(NSString *)imageDiffDirectory
                   identifier:(nullable NSString *)identifier
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