Objective-C读取本地json数据

最新推荐文章于 2025-09-16 23:26:57 发布

原创最新推荐文章于 2025-09-16 23:26:57 发布 · 1k 阅读

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#json #objective-c

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本文介绍了如何在Objective-C中将JSON字符串转换为字典，以及如何读取本地JSON文件并将数据转化为模型对象。

1.JSON字符串转字典

+ (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;
}
@end

2. 读取本地json数据，字典转模型

+ (NSMutableArray *)loadLocalData {
    // josn文件的路径
    NSString *path = [[NSBundle mainBundle] pathForResource:@"home_timeline" ofType:@"json"];
    // 将文件数据化
    NSError * error=nil;
    NSString *jsonString = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:&error];
    //josn字符串转字典
    NSDictionary *dic = [self dictionaryWithJsonString:jsonString];
    //字典转模型
    NSArray *data = [dic objectForKey:@"statuses"];
    NSMutableArray *marray = [[NSMutableArray alloc]initWithCapacity:100];
    for(id obj in data) {//obj是字典
        id usermessage = [obj objectForKey:@"user"];
        DWUser *user = [DWUser DWUserWithDictionary:usermessage];
        DWStatus *status = [DWStatus DWStatusWithDictionary:obj andUserModel:user];
        DWStatusFrame *statusFrame = [[DWStatusFrame alloc]init];
        statusFrame.status = status;
        [marray addObject:statusFrame];
    }
    return marray;
}