ios – 按宽度按比例调整UIImage的大小

我需要按宽度按比例调整UI Image,可能有人有工作代码吗？

例如：

Input: Width: 900 Height: 675. Resize to width: 400 width

Result: Width: 400 Height: 300

请帮忙..

解决方法

检查 this blog post.特别是这两个文件：

> UIImage+Resize.h
> UIImage+Resize.m

也许这对你有用：

UIImage *image = [UIImage imageNamed:@"SomeImage-900x675"]; // SomeImage-900x675.png
CGFloat targetWidth = 400.0f;

CGFloat scaleFactor = targetWidth / image.size.width;
CGFloat targetHeight = image.size.height * scaleFactor;
CGSize targetSize = CGSizeMake(targetWidth,targetHeight);

UIImage *scaledImage = [image resizedImage:targetSize interpolationQuality:kCGInterpolationHigh];