来自NSString中保存的字节的UIImage [英] UIImage from bytes held in NSString

问题描述

我正在尝试从一个实际上保存在NSString中的字节数组创建一个UIImage。

I am trying to create a UIImage from a byte array that is actually held within a NSString.

有人可以告诉我我该怎么做吗？

Can someone please tell me how I can do that?

以下是我的想法：

NSString *sourceString = @"mYActualBytesAREinHERe=";
//get the bytes
const char *bytesArray = [sourceString cStringUsingEncoding:NSASCIIStringEncoding];
//build the NSData object
NSData *data = [NSData dataWithBytes:bytesArray length:[sourceString length]];
//create actual image
UIImage *image = [UIImage imageWithData:data];

问题是图像总是0x0（无）。

The problem is image is always 0x0 (nil).

任何建议都将受到赞赏。

Any suggestions would be appreciated.

谢谢！

推荐答案

要将图像转换为字符串，您需要一种方法将 NSData 转换为base64Encoded字符串并返回（许多示例这里）。最容易使用的是 NSData 上的类别，所以你可以这样做：

To convert an image to string you need a method to convert NSData to a base64Encoded string and back (lots of examples here). The easiest ones to use are categories on NSData so you can do something like this:

UIImage* pic = [UIImage imageNamed:@"sample.png"];
NSData* pictureData = UIImagePNGRepresentation(pic);
NSString* pictureDataString = [pictureData base64Encoding];

换句话说你需要一个反向转换器：

To go the other way you need a reverse converter:

UIImage* image = [UIImage imageWithData:[NSData 
            dataFromBase64EncodedString: pictureDataString]];

这篇关于来自NSString中保存的字节的UIImage的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！