如何将UIImage调整为特定大小 [英] How can I resize the UIImage to specific size

问题描述

在我的应用中，我正在用相机拍照，并以320 * 320 UIView格式显示.但是，由于图像分辨率大于UIView的分辨率，因此它的外观受到挤压.有什么办法可以调整图像的大小?

In my app, I am taking picture with camera and displaying it in 320*320 UIView. But as the image resolution is more than that of UIView its kinda look squeezed. Is there any way I can resize that image?

推荐答案

在这里，您可以在保持图像的宽高比的同时调整图像的大小.下面的代码来自UIImage的类别:

Here's how you can resize the image while preserving its aspect ratio. The code below is from a category for UIImage:

+ (UIImage*)imageWithImage:(UIImage *)image 
              scaledToSize:(CGSize)newSize
{

    float heightToWidthRatio = image.size.height / image.size.width;
    float scaleFactor = 1;
    if(heightToWidthRatio > 0) {
        scaleFactor = newSize.height / image.size.height;
    } else {
        scaleFactor = newSize.width / image.size.width;
    }

    CGSize newSize2 = newSize;
    newSize2.width = image.size.width * scaleFactor;
    newSize2.height = image.size.height * scaleFactor;

    UIGraphicsBeginImageContext(newSize2);
    [image drawInRect:CGRectMake(0,0,newSize2.width,newSize2.height)];
    UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return newImage;
}

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