UIImageView内容模式未按比例缩小图像

Question

I am trying to load a large UIImage into a UIImageView without rescaling the image first.

This is what I currently have (where self.mediaView is my UIImageView):

self.mediaView.contentMode = UIViewContentModeScaleAspectFit;
self.mediaView.clipsToBounds = YES;
[self.mediaView setFrame:self.view.bounds];
NSLog(@"screen dimensions: %f x %f", _screenWidth, _screenHeight);
NSLog(@"frame size: %f x %f", self.mediaView.frame.size.width, self.mediaView.frame.size.height);
NSLog(@"image dimensions: %f x %f", self.selectedMedia.getView.image.size.width, self.selectedMedia.getView.image.size.height);
[self.mediaView setImage:self.selectedMedia.getView.image];

From my logs, I know the following:

screen dimensions: 320.000000 x 568.000000
frame size: 320.000000 x 460.000000
image dimensions: 1136.000000 x 852.000000

But when the UIImageView loads, the UIImage is cut off, so I can tell the UIImage isn't being scaled properly.

Any tips on how to fix this?

Answer 1

我必须在情节提要中设置确切的宽度和高度限制（使用自动布局），以确保将imageView限制为特定大小。

Answer 2

what does "image dimensions: 1136.000000 x 852.000000" mean?

I have two kinds of understanding.

1. origal image's dimensions :1136.000000 x 852.000000
2. [self.mediaView setImage:self.selectedMedia.getView.image] has been called,the image's dimensions:1136.000000 x 852.000000