iPhone: Mask UIImageView of differing dimensions into square dimension

问题

I have a bunch of UIImageViews that are in different proportions. Some of 100x101 some are 130x121.

How can I mask these to 80x80 and NOT stretch the images? I basically just want to mask a square out of each one. (kind of like the Apple's Photo thumbnail view does)

回答1:

1. Set the image view's size to 80 x 80
2. set the image view's contentMode property to UIViewContentModeScaleAspectFill

3. Finally, to make round corners, use the following code, and import QuartzCore/QuartzCore.h at the beginning of your implementation file.

   CALayer * layer = [myImageView layer];
   [layer setMasksToBounds:YES];
   [layer setCornerRadius:12.0f];
   

Edited: Yes, by saying size I mean frame, the W and H:

回答2:

Set its content mode UIViewContentMode, you may be looking for UIViewContentModeScaleAspectFit or UIViewContentModeScaleAspectFill.

UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 80, 80)];
[imageView setContentMode:UIViewContentModeScaleAspectFit];
[imageView setImage:[UIImage imageNamed:@"myImage.png"];
.
.
.

来源：https://stackoverflow.com/questions/4789067/iphone-mask-uiimageview-of-differing-dimensions-into-square-dimension