将Gif图像转换为NSData [英] Convert Gif image to NSData

问题描述

我的相册中有一张gif图像.使用UIImagePickerController选择该图像时，需要将图像转换为NSData进行存储.

I have a gif image in my photo album. When I use the UIImagePickerController to select that image, I need to convert the image to NSData for storing.

我以前使用过

NSData *thumbData = UIImageJPEGRepresentation(thumbnail, 0.5);

，但不适用于gif图像. thumbData将为零.

but it will not work with gif images. thumbData will be nil.

1. 如何从gif图像中获取NSData?

我怎么知道这是需要特殊处理的gif图像?

How can I know that it is a gif image that needs special handing?

推荐答案

此处的关键是将GIF文件或URL下载直接保存到NSData中，而不是使其成为UIImage.绕过UIImage将使GIF文件保留动画.

The key here is to save the GIF file or URL download directly into a NSData instead of making it a UIImage. Bypassing UIImage will let the GIF file keep the animation.

下面是一些将GIF文件转换为NSData的代码:

Here is some code to convert a GIF file into NSData:

NSString *filePath = [[NSBundle mainBundle] pathForResource: @"gifFileName" ofType: @"gif"];

NSData *gifData = [NSData dataWithContentsOfFile: filePath];

但是，老实说，您应该真正考虑完全不使用GIF.

But in all honesty, you should really consider not using GIF at all.

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