iOS中文网址路径转换URLEncode

今天发现一个蛋疼的问题，服务端返回的urlString里面有时含有中文,使用

[NSURL URLWithString:urlString]生成URL对象时,iOS客户端不能正确进行网络请求,网上找到的URLEncode方法又不能完全解决问题.

方法1:

NSString* encodedString = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

方法2:

NSString * encodedString = (NSString *)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,(CFStringRef)urlString,NULL,NULL,kCFStringEncodingUTF8);

这两种方法当urlString里含有中文时URL编码是正确的,但是如果其中含有已转义的%等符号时,又会再次转义而导致错误.

查看方法2参数说明:

CFStringRef CFURLCreateStringByAddingPercentEscapes(CFAllocatorRef allocator, CFStringRef originalString, CFStringRef charactersToLeaveUnescaped, CFStringRef legalURLCharactersToBeEscaped, CFStringEncoding encoding);

因此做出修改,写出方法:

NSString *encodedString = (NSString *)

CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,

                                        (CFStringRef)urlString,

                                        (CFStringRef)@"!$&‘()*+,-./:;[email protected]_~%#[]",

                                        NULL,

                                        kCFStringEncodingUTF8);

如果在所有的类里都要用到这个方法,可以写成category,然后在头文件import "NSString+URL.h" 即可调用.

@interface NSString (URL)
- (NSString *)URLEncodedString;
@end  

#import "NSString+URL.h"  

@implementation NSString (URL)  

- (NSString *)URLEncodedString
{
    NSString *encodedString = (NSString *)
    CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,
                                            (CFStringRef)self,
                                            (CFStringRef)@"!$&‘()*+,-./:;[email protected]_~%#[]",
                                            NULL,
                                            kCFStringEncodingUTF8);
    return encodedString;
}
@end  

调用方法:

NSString *encodedString = [urlString URLEncodedString];

//encodedString do something