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iosmacoscocoauiimagensimage

NSImage to NSData, then to UIImage

I am creating a plist from my OSX app that contains some images. I am writing the image by :

[NSKeyedArchiver archivedDataWithRootObject:self.someImage]

Then I am using this plist file as a template for iOS app, but here I can't convert the file to UIImage and neither to NSImage(as this is only for OSX).

I am getting this error:

* Terminating app due to uncaught exception 'NSInvalidUnarchiveOperationException', reason: '* -[NSKeyedUnarchiver decodeObjectForKey:]: cannot decode object of class (NSImage)'

Please suggest me a way to perform the above.

Solution

  • OS X:
    Instead of using NSKeyedArchiver to convert an NSImage to NSData, use NSImage's TIFFRepresentation method:

    NSData *imageData = [self.someImage TIFFRepresentation];
// save imageData to file

    iOS:
    Read the image data from the file, then convert it to a UIImage using UIImage's +imageWithData: convenience constructor:

    NSData *imageData = ...; // load imageData from file
UIImage *image = [UIImage imageWithData: imageData];