今天发现一个蛋疼的问题，使用ASIHTTPRequest  Get方式请求数据时候带中文，iOS客户端不能正确进行网络请求。

NSURL *url = [NSURL URLWithString:@http://unmi.cc?p1=%+&sd f&p2=中文"];

ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];

打印出来url为nil  还好，在网上找到了如下方法就可以解决这个问题

//NSString+URLEncoding.h

#import<Foundation/Foundation.h>

@interface NSString (OAURLEncodingAdditions)

- (NSString *)URLEncodedString;

- (NSString *)URLDecodedString;

@end

//NSString+URLEncoding.m

#import"NSString+URLEncoding.h"

@implementation NSString (OAURLEncodingAdditions)

- (NSString *)URLEncodedString

{

   NSString*result = (NSString*)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,

                                                                           (CFStringRef)self,

                                                                           NULL,

  CFSTR("!*'();:@&=+$,/?%#[]"),

                                                                           kCFStringEncodingUTF8);

    [result autorelease];

return result;

}

//解决url乱码

- (NSString*)URLDecodedString

{

NSString*result = (NSString*)CFURLCreateStringByReplacingPercentEscapesUsingEncoding(kCFAllocatorDefault,

  (CFStringRef)self,

  CFSTR(""),

  kCFStringEncodingUTF8);

    [result autorelease];

return result;

}

// 调用方法

 NSString *encodedString = [urlString URLEncodedString];