The clipping rectangle for a thumbnail image.
- iOS 10.0+
- macOS 10.14+
- Mac Catalyst 13.0+
- watchOS 3.0+
The value of this key is a dictionary containing a normalized
CGRect—that is, a unit rectangle whose values are in the range
1 and represent the portion of the original image that you want to display. For example, specifying an origin of (
0) and a size of (
0) defines a clipping rectangle that shows only the center portion of the image. Use the
dictionary function to create the dictionary for your rectangle.