压缩UIImage但保持大小 [英] compress UIImage but keep size

问题描述

我尝试使用 UIImageView 来显示照片。但照片有时候有点大，我想压缩它。但我想保持它的大小。
例如，一张照片是4M，尺寸为320X480。我想压缩它，它可能有1M但仍然有320X480的大小。

I try to use UIImageView to show the photo. But the Photo sometimes is a little large, and I want to compress it.But I'd like to keep its size. For example,a photo is 4M and has a size of 320X480. And I want to compress it and it may have 1M but still has a size of 320X480.

谢谢！

推荐答案

使用JPEG压缩对其进行压缩。

Compress it using the JPEG compression.

lowResImage = [UIImage imageWithData:UIImageJPEGRepresentation(highResImage, quality)];

质量介于0.0和1.0之间

Where quality is between 0.0 and 1.0

您应该阅读 UIImage文档，一切都在那里解释......

You should read the UIImage documentation, everything is explained in there…

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