ios url网址相关问题解说

问题1：ios网址中存在汉字的情况，需要GB_18030_2000编码方法如下：

// 汉字转编码
+ (NSString *)changeChineseWithEncodingGB_18030_2000:(NSString *)string{
    NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
    NSData *data = [string dataUsingEncoding:enc];
    NSString *retStr = [[NSString alloc] initWithData:data encoding:enc];
    return retStr;
}

问题2：H5中url 的encode/decode

+ (NSString *)URLDecodedString:(NSString *)str{
    NSString *decodedString=(__bridge_transfer NSString *)CFURLCreateStringByReplacingPercentEscapesUsingEncoding(NULL, (__bridge CFStringRef)str, CFSTR(""), CFStringConvertNSStringEncodingToEncoding(NSUTF8StringEncoding));
    
    return decodedString;
}
+ (NSString *)URLEncodedString:(NSString *)str{
    NSString *encodedString = (NSString *)
    CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,
                                                              (CFStringRef)str,
                                                              NULL,
                                                              (CFStringRef)@"!*'();:@&=+$,/?%#[]",
                                                              kCFStringEncodingUTF8));
    
    return encodedString;
}

问题3：网址暴力解析参数

+ (NSDictionary *)analysisWebUrl:(NSString *)urlStr{
    NSRange range = [urlStr rangeOfString:@"?"];
    if (range.length == 0) {
        return @{};
    }
    NSString *propertys = [urlStr substringFromIndex:(int)(range.location+1)];

    NSArray *subArray = [propertys componentsSeparatedByString:@"&"];
    
    NSMutableDictionary *tempDic = [NSMutableDictionary dictionaryWithCapacity:4];
    for (int j = 0 ; j < subArray.count; j++)
    {
        NSArray *dicArray = [subArray[j] componentsSeparatedByString:@"="];
        [tempDic setObject:dicArray[1] forKey:dicArray[0]];
    }
    return tempDic;
}

问题4：json转化， post中复杂格式数据下 需要转json

//字典转json
+ (NSString*)dictToJson:(NSDictionary*)dict{
    NSLog(@"%@",dict);
    if (dict==nil) {
        return nil;
    }
    NSData*data=[NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:nil];
    NSString*string=[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
    return string;
}
//json转字典
+ (NSDictionary*)jsonToDict:(NSString*)string{
    if (string==nil) {
        return nil;
    }
    NSData *jsonData = [string dataUsingEncoding:NSUTF8StringEncoding];
    NSError *err;
    NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:jsonData
                         
                                                        options:NSJSONReadingMutableContainers
                         
                                                          error:&err];
    if(err) {
        NSLog(@"json解析失败：%@",err);
        return nil;
    }
    return dic;
}