iOS中编码转化

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OS中编码转化

1.UTF-8转化

NSString *data = @"你好，北京！";

//转换成UTF-8

NSString *dataUTF8 = [data stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

NSLog(@"%@",dataUTF8);

//UTF-8转GBK,将UTF8代码替换，官方解释如下。

//Replaces all percent escapes with the matching characters as determined by the given encoding. Returns nil if the transformation is not possible (i.e. the percent escapes give a byte sequence not legal in the given encoding). See CFURLCreateStringByReplacingPercentEscapes in CFURL.h for more complex transformations

NSString *dataGBK = [dataUTF8 stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

NSLog(@"%@",dataGBK);

在Xcode4.2中执行结果如下：

发现NSString类中有内置的方法可以实现。他们分别是：

- (NSString *)stringByAddingPercentEscapesUsingEncoding:(NSStringEncoding)encoding
- (NSString *)stringByReplacingPercentEscapesUsingEncoding:(NSStringEncoding)encoding

；解码的时候一般用Replacing 转成中文

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