iOS开发中Objective-C 对 URL的URLEncode（编码）与URLDecode（解码）

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废话不多说，直接上代码。

<pre name="code" class="objc">

////  NSString+URL.h////  Created by aidong on 15/5/8.//  Copyright (c) 2015年 aidong. All rights reserved.///** *  url字符串中具有特殊功能的特殊字符的字符串，或者中文字符,作为参数用GET方式传递时，需要用urlencode处理一下。 * *  例如：在 iOS 程序访问 HTTP 资源时，像拼出来的 http://unmi.cc?p1=%+&sd f&p2=中文，其中的中文、特殊符号&％和空格都必须进行转译才能正确访问。 *//** *  调用示例：        引入头文件：NSString+URL.h         // URLEncode        NSString *unencodedString = @"cc?p1=%+&sd f&p";        NSString *encodedString = [unencodedString URLEncodedString];         // URLDecode        NSString *undecodedString = @"%25+&sd%20&p2=%E4%B8%AD%E6%96%87";        NSString *decodedString = [undecodedString URLDecodedString]; */#import <Foundation/Foundation.h>@interface NSString (URL)/** *  URLEncode */- (NSString *)URLEncodedString;/** *  URLDecode */-(NSString *)URLDecodedString;@end

////  NSString+URL.m////  Created by aidong on 15/5/8.//  Copyright (c) 2015年 aidong. All rights reserved.//#import "NSString+URL.h"@implementation NSString (URL)/** *  URLEncode */- (NSString *)URLEncodedString{    // CharactersToBeEscaped = @":/?&=;+!@#$()~',*";    // CharactersToLeaveUnescaped = @"[].";        NSString *unencodedString = self;    NSString *encodedString = (NSString *)    CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,                                                              (CFStringRef)unencodedString,                                                              NULL,                                                              (CFStringRef)@"!*'();:@&=+$,/?%#[]",                                                              kCFStringEncodingUTF8));        return encodedString;}/** *  URLDecode */-(NSString *)URLDecodedString{    //NSString *decodedString = [encodedString stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding ];        NSString *encodedString = self;    NSString *decodedString  = (__bridge_transfer NSString *)CFURLCreateStringByReplacingPercentEscapesUsingEncoding(NULL,                                                                                                                     (__bridge CFStringRef)encodedString,                                                                                                                     CFSTR(""),                                                                                                                     CFStringConvertNSStringEncodingToEncoding(NSUTF8StringEncoding));    return decodedString;}@end

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