iOS开发--字典(NSDictionary)和JSON字符串(NSString)之间互转

1. 字典转Json字符串

// 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;

}

2. 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; }