iOS 数组／字典转json

 NSMutableArray *tempArr = [NSMutableArray array]; //这里不要用for-in 先找到模型，然后给可变字典赋值，最后装到数组里    NSMutableDictionary *dic = [NSMutableDictionary dictionary];    for (int i = 0; i < self.dataSourceArr.count; i++) {        PerponModel *model = self.dataSourceArr[i];        [dic setValue:model.name forKey:@"realname"];        [dic setValue:model.phoneNumber forKey:@"mobile"];        [tempArr addObject:dic];    }    //dataWithJSONObject：后面这个是一个id类型的这样放数组就转数组，字典就转字典    //NSJSONWritingPrettyPrinted是一个枚举    NSData *data = [NSJSONSerialization dataWithJSONObject:tempArr options:NSJSONWritingPrettyPrinted error:nil];    NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];