iOS Unicode和汉字互转

//unicode转中文
NSString* strA = [@"%E4%B8%AD%E5%9B%BD"stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
//中文转unicode
NSString *strB = [@"中国"stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

ios9之后

NSString *urlStr = @"url地址";

//中文转unicode
urlStr = [urlStr stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];

//unicode转中文
urlStr = [urlStr stringByRemovingPercentEncoding];

知道他们两个的区别吗？stringByReplacingPercentEscapesUsingEncoding  和stringByAddingPercentEscapesUsingEncoding。待续。。。。。

 unicode