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NSString *observedSelector = NSStringFromSelector( localizedDescription))

Static void *ExtractFilesContext = &ExtractFilesContext If you don't have a hierarchy of NSProgress instances, or if you want to observe more details during progress updates in extractFilesTo:overwrite:error:, you can create your own instance of NSProgress and set the URKArchive instance's progress property, like so: Using your own explicit NSProgress instance [extractDataProgress addObserver: self forKeyPath:observedSelector NSString *observedSelector = NSStringFromSelector( fractionCompleted))

URKArchive *archive = initWithURL:aFileURL error: nil] Static void *ExtractDataContext = &ExtractDataContext