如何在我的应用程序中使用此 JSON 文本？答案

【问题标题】：How do I use this JSON text in my app?如何在我的应用程序中使用此 JSON 文本？
【发布时间】：2015-01-05 04:36:06
【问题描述】：

我有以下 JSON 文本，如下所示。我想将它合并到我的应用程序中，并且能够将它的一部分分配给要使用的变量。很简单，我知道，但我不知道该怎么做。

[{"id":"1","category":"1","fact":"Worldwide, around 1.2 trillion eggs are produced for eating every year, which means that average person on Earth consumes 173 eggs a year."},{"id":"3","category":"2","fact":"How to tell if you're going to throw up? -Your mouth starts to fill with saliva which is there to protect your mouth and teeth from the stomach acid mixed with the vomit."},{"id":"2","category":"2","fact":"Bone cells are constantly renew so every ten years you have a new skeleton."}]

【问题讨论】：

在NSJSONSerialization上做一些搜索。
请注意，如果您在 Google 上搜索“objective-c json”，您会得到几十个示例。

标签： objective-c json

【解决方案1】：

您的文本看起来像一个数组。所以试试这样：-

NSError *err = nil;
NSArray *jsonArray = [NSJSONSerialization JSONObjectWithData:data options: NSJSONReadingMutableContainers error: &err];

【讨论】：

【解决方案2】：

如果您的 json 文本是 NSString，则需要将其转换为 NSData：

    NSString* jsonText = @"[{"id":"1","category":"1","fact":"Worldwide, around 1.2 trillion eggs are produced for eating every year, which means that average person on Earth consumes 173 eggs a year."},{"id":"3","category":"2","fact":"How to tell if you're going to throw up? -Your mouth starts to fill with saliva which is there to protect your mouth and teeth from the stomach acid mixed with the vomit."},{"id":"2","category":"2","fact":"Bone cells are constantly renew so every ten years you have a new skeleton."}]";
    NSData* data = [jsonText dataUsingEncoding:NSUTF8StringEncoding];

    NSError* error;
    NSDictionary* jsonDict = [NSJSONSerialization 
    JSONObjectWithData:responseData
    options:kNilOptions 
    error:&error];

所以现在您可以像字典一样访问元素。希望对您有所帮助。

【讨论】：