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how to use UIImageWriteToSavedPhotosAlbum ?

currently, I'm creating a wallpaper app for ios, I did well in creating the UIimageview but when it came to user save image button I got stuck, I have solved the permissions but how to make the button allows the user to save the image viewed that's what I'm stuck at.i have mentioned the in the swift code that there is a button for saving, but I don't really know to make this button when pressed by user allow him to say any image from the image array to be saved in his gallery ...