We have an app that resizes iPhone contact pictures and then saves them back in the address book.
When Jim has a normal 1200 x 1600 picture, and he is calling my phone, the picture gets correctly scaled within the iPhone screen so that it shows the whole picture.
When I resize this image to a 320 x 420-something, and save it in the address book, the picture no longer gets scaled, but gets 'blown up' so that I see the center of the picture.
Is this someone has experienced before? Is it a coding error, or a bug in the iPhone?
Thanks!
Apparently this is a bug in the iPhone. A lot of users have experienced that when a picture gets updated through the API, it won't scale correctly.
I ended up just resizing the pictures small enough to be displayed in the top right corner of the screen, instead of expecting them to be resized when someone is calling.
来源：https://stackoverflow.com/questions/4334926/iphone-i-resize-a-contacts-image-but-when-that-person-is-calling-the-picture