美文网首页iOS常用
iOS数组、字典与json字符串的转换

iOS数组、字典与json字符串的转换

作者: 缘來諟夢 | 来源:发表于2020-11-11 18:15 被阅读0次
    /*!
     *  将字典或者数组转化为JSON串
     *
     *  @param theData <#theData description#>
     *
     *  @return <#return value description#>
     */
    + (NSString *)toJSONData:(id)theData{
        NSString * jsonString = @"";
        if (theData != nil) {
            NSData *jsonData = [NSJSONSerialization dataWithJSONObject:theData
                                                               options:NSJSONWritingPrettyPrinted
                                                                 error:nil];
     
            if ([jsonData length] != 0){
                jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
            }
        }
        return jsonString;
    }
     
    /*!
     *  将JSON串转化为字典或者数组
     *
     *  @param jsonData <#jsonData description#>
     *
     *  @return <#return value description#>
     */
     
    + (id)toArrayOrNSDictionary:(NSString *)jsonData{
        if (jsonData != nil) {
            NSData* data = [jsonData dataUsingEncoding:NSUTF8StringEncoding];
            id jsonObject = [NSJSONSerialization JSONObjectWithData:data
                                                            options:NSJSONReadingAllowFragments
                                                              error:nil];
     
            if (jsonObject != nil){
                return jsonObject;
            }else{
                // 解析错误
                return nil;
            }
        }
        return nil;
    }
     
    /*!
     * 对象序列成字典
     *
     * @param obj 需要序列化的对象
     *
     * @return 字典
     */
     
    + (NSDictionary*)getDictionaryFromObject:(id)obj
    {
        NSMutableDictionary *dic = [NSMutableDictionary dictionary];
        unsigned int propsCount;
        objc_property_t *props = class_copyPropertyList([obj class], &propsCount);
        for(int i = 0;i < propsCount; i++) {
            objc_property_t prop = props[i];
            id value = nil;
     
            @try {
                NSString *propName = [NSString stringWithUTF8String:property_getName(prop)];
                value = [self getObjectInternal:[obj valueForKey:propName]];
                if(value != nil) {
                    [dic setObject:value forKey:propName];
                }
            }
            @catch (NSException *exception) {
                NSLog(@"%@",exception);
            }
     
        }
        free(props);
        return dic;
    }
     
    + (id)getObjectInternal:(id)obj
    {
        if(!obj
           || [obj isKindOfClass:[NSString class]]
           || [obj isKindOfClass:[NSNumber class]]
           || [obj isKindOfClass:[NSNull class]]) {
            return obj;
        }
     
        if([obj isKindOfClass:[NSArray class]]) {
            NSArray *objarr = obj;
            NSMutableArray *arr = [NSMutableArray arrayWithCapacity:objarr.count];
            for(int i = 0;i < objarr.count; i++) {
                [arr setObject:[self getObjectInternal:[objarr objectAtIndex:i]] atIndexedSubscript:i];
            }
            return arr;
        }
     
        if([obj isKindOfClass:[NSDictionary class]]) {
            NSDictionary *objdic = obj;
            NSMutableDictionary *dic = [NSMutableDictionary dictionaryWithCapacity:[objdic count]];
            for(NSString *key in objdic.allKeys) {
                [dic setObject:[self getObjectInternal:[objdic objectForKey:key]] forKey:key];
            }
            return dic;
        }
        return [self getDictionaryFromObject:obj];
    }
    
    1. JSON字符串转化为字典
    
    + (NSDictionary *)dictionaryWithJsonString:(NSString *)jsonString
    {
        if (jsonString == nil) {
            return nil;
        }
    
        NSData *jsonData = [jsonString 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;
    }
    // 字典转json字符串方法
    
    -(NSString *)convertToJsonData:(NSDictionary *)dict
    
    {
    
        NSError *error;
    
        NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:&error];
    
        NSString *jsonString;
    
        if (!jsonData) {
    
            NSLog(@"%@",error);
    
        }else{
    
            jsonString = [[NSString alloc]initWithData:jsonData encoding:NSUTF8StringEncoding];
    
        }
    
        NSMutableString *mutStr = [NSMutableString stringWithString:jsonString];
    
        NSRange range = {0,jsonString.length};
    
        //去掉字符串中的空格
    
        [mutStr replaceOccurrencesOfString:@" " withString:@"" options:NSLiteralSearch range:range];
    
        NSRange range2 = {0,mutStr.length};
    
        //去掉字符串中的换行符
    
        [mutStr replaceOccurrencesOfString:@"\n" withString:@"" options:NSLiteralSearch range:range2];
    
        return mutStr;
    
    }
    

    相关文章

      网友评论

        本文标题:iOS数组、字典与json字符串的转换

        本文链接:https://www.haomeiwen.com/subject/duhybktx.html