json 類型

1.生成json字符串

NSData * jsonData = [NSJSONSerialization dataWithJSONObject:detailDic options:0 error:nil];  
NSString * myString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];

2.json解析

NSDictionary * selectSimpleTest = [NSJSONSerialization JSONObjectWithData:[tizhiSimpleTest.detail dataUsingEncoding:NSUTF8StringEncoding] options:0 error:nil];

3.字典轉化成json 類型

+(NSString *)JsonModel:(NSDictionary *)dictModel
{
    if ([NSJSONSerialization isValidJSONObject:dictModel])
    {
        NSData * jsonData = [NSJSONSerialization dataWithJSONObject:dictModel options:NSJSONWritingPrettyPrinted error:nil];
        NSString * jsonStr = [[NSString alloc]initWithData:jsonData encoding:NSUTF8StringEncoding];
        return jsonStr;
    }
    return nil;
}