iOS url编码解码

-(NSString *)URLEncodedString:(NSString *)str  
{  
    NSString *encodedString = (NSString *)  
    CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,  
                                                              (CFStringRef)str,  
                                                              NULL,  
                                                              (CFStringRef)@"!*'();:@&=+$,/?%#[]",  
                                                              kCFStringEncodingUTF8));  
    return encodedString;  
}

-(NSString *)URLDecodedString:(NSString *)str  
{  
    NSString *decodedString=(__bridge_transfer NSString *)CFURLCreateStringByReplacingPercentEscapesUsingEncoding(NULL, (__bridge CFStringRef)str, CFSTR(""), CFStringConvertNSStringEncodingToEncoding(NSUTF8StringEncoding));  
    return decodedString;  
}

NSString *readyEcodeStr=@"adsfa asdfa s+asdf";//准备urlecode的字符串  
    NSString *ecodeStr=[self URLEncodedString:readyEcodeStr];  
    NSLog(@"readyEcodeStr=%@  ecodeStr=%@",readyEcodeStr,ecodeStr);