iPhone:在AspectFt之后获取图像的大小 [英] iPhone : Getting the size of an image after AspectFt
问题描述
真奇怪的人会被困住,但奇怪的是我。
Real odd one to get stuck on but weirdly I am.
你有一个 imageView
包含一个图片。您将 imageView
缩小,然后告诉它使用 UIViewContentModeScaleAspectFit
。所以你的 imageView
可能是300乘200,但你的缩放图像可能是300乘118或228乘200,因为它的 aspectfit
。
You you have a imageView
containing a image. You size that imageView
down and then tell it to use UIViewContentModeScaleAspectFit
. so your imageView
might be 300 by 200 but your scaled image within could be 300 by 118 or 228 by 200 because its aspectfit
.
如何获得实际图像的大小?
imageView.image.size
是原始图片的大小。
imageview.frame
是 imageview的框架
不包含图片。
imageview.contentstretch
无效
How on earth do you get the size of the actual image?
imageView.image.size
is the size of the original image.
imageview.frame
is the frame of the imageview
not the contained image.
imageview.contentstretch
does not work either
推荐答案
我在UIImageView上编写了一个快速类别来实现:
I have written a quick category on UIImageView to achieve that:
(。h)
@interface UIImageView (additions)
- (CGSize)imageScale;
@end
(。m)
@implementation UIImageView (additions)
- (CGSize)imageScale {
CGFloat sx = self.frame.size.width / self.image.size.width;
CGFloat sy = self.frame.size.height / self.image.size.height;
CGFloat s = 1.0;
switch (self.contentMode) {
case UIViewContentModeScaleAspectFit:
s = fminf(sx, sy);
return CGSizeMake(s, s);
break;
case UIViewContentModeScaleAspectFill:
s = fmaxf(sx, sy);
return CGSizeMake(s, s);
break;
case UIViewContentModeScaleToFill:
return CGSizeMake(sx, sy);
default:
return CGSizeMake(s, s);
}
}
@end
乘以原始图像尺寸按给定比例,您将获得实际显示的图像尺寸。
Multiply the original image size by the given scale, and you'll get your actual displayed image size.
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