调整UIImage大小的最简单方法是什么? [英] The simplest way to resize an UIImage?
问题描述
在我的iPhone应用程序中,我用相机拍照,然后我想将其调整为290 * 390像素。我正在使用此方法调整图像大小:
In my iPhone app, I take a picture with the camera, then I want to resize it to 290*390 pixels. I was using this method to resize the image :
UIImage *newImage = [image _imageScaledToSize:CGSizeMake(290, 390)
interpolationQuality:1];
它完美无缺,但它是一个无证件的功能,所以我不能再使用iPhone OS4了。
It works perfectly, but it's an undocumented function, so I can't use it anymore with iPhone OS4.
那么...调整UIImage大小的最简单方法是什么?
So... what is the simplest way to resize an UIImage ?
推荐答案
最简单的方法是设置 UIImageView
的框架,将 contentMode
设置为其中一个调整大小选项。
The simplest way is to set the frame of your UIImageView
and set the contentMode
to one of the resizing options.
或者,如果您确实需要,可以使用此实用程序方法调整图像大小:
Or you can use this utility method, if you actually need to resize an image:
+ (UIImage *)imageWithImage:(UIImage *)image scaledToSize:(CGSize)newSize {
//UIGraphicsBeginImageContext(newSize);
// In next line, pass 0.0 to use the current device's pixel scaling factor (and thus account for Retina resolution).
// Pass 1.0 to force exact pixel size.
UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
[image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
用法示例:
#import "MYUtil.h"
…
UIImage *myIcon = [MYUtil imageWithImage:myUIImageInstance scaledToSize:CGSizeMake(20, 20)];
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