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並前往https://www.hackingwithswift.com/example-code/media/how-to-save-a-uiimage-to-a-file-using-jpegdata-and-pngdata

How to save a UIImage to a file using jpegData() and pngData()

Both are easy thanks to two methods: pngData() and jpegData() , both of which convert a UIImage into a Data instance you can write out.

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