Objective-C 奇怪的 plist 到字典的行为

发布于 2024-11-13 04:50:53 字数 744 浏览 2 评论 0 原文

我有一个非常简单的 plist，它被加载到 NSDictionary 中。但是，当我尝试访问特定值时，没有可用数据。

这就是我的 plist 的结构：

edit* xml 搞乱了。你可以去pastebin看看： http://pastebin.com/C419ZVeJ

这里我加载plist：（

NSString *bundlePath = [[NSBundle mainBundle] bundlePath];
NSString *finalPath = [bundlePath stringByAppendingPathComponent:@"Test.plist"];
NSDictionary *metaPlistData = [NSDictionary dictionaryWithContentsOfFile:finalPath];


NSDictionary *meta = [metaPlistData valueForKey:@"meta"];
NSDictionary *assets = [meta valueForKey:@"sd"];

我已经删除了访问key=1 条目）

当我检查 gdb 中的“meta”字典和“assets”字典时，“meta”包含所需的条目。然而，资产始终为零。我真的在这里迷失了..有什么想法吗？我在代码的其他位置使用这种方法从 plist 加载数据，这从来都不是问题。

原文

i have a really simple plist which is loaded into a NSDictionary. However, when i try to access a specific value, no data is available.

This is how my plist is structured:

edit* xml got messed up. You can take a look at it at pastebin:
http://pastebin.com/C419ZVeJ

Here i load the plist:

NSString *bundlePath = [[NSBundle mainBundle] bundlePath];
NSString *finalPath = [bundlePath stringByAppendingPathComponent:@"Test.plist"];
NSDictionary *metaPlistData = [NSDictionary dictionaryWithContentsOfFile:finalPath];


NSDictionary *meta = [metaPlistData valueForKey:@"meta"];
NSDictionary *assets = [meta valueForKey:@"sd"];

(i have removed the line where i access the key=1 entry)

When i inspect the "meta" dictionary and the "assets" dictionary in gdb, "meta" contains the required entries. However, assets always is nil. I am really lost here.. any ideas why? I load data from plists using this approach at other locations in my code and it has never been a problem.

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挽心 2024-11-20 04:50:53

乍一看，您似乎在层次结构中落后了一层。 “sd”不是“meta”字典中的键，而是“1”字典中的键。尝试一下：

NSDictionary *meta = [metaPlistData objectForKey:@"meta"];
NSDictionary *one = [meta objectForKey:@"1"];
NSDictionary *assets = [one objectForKey:@"sd"];

还要注意，您应该使用 -objectForKey: 进行字典访问（-valueForKey: 可能会在这种情况下工作，但它属于键值编码机制这有点不同。）

（另外，不确定这是否只是一个粘贴问题，但你的 plist 看起来不完整。）

On first blush, it looks like you're off by one layer in the hierarchy. "sd" isn't a key in the "meta" dictionary, it's a key in the "1" dictionary. Try this:

NSDictionary *meta = [metaPlistData objectForKey:@"meta"];
NSDictionary *one = [meta objectForKey:@"1"];
NSDictionary *assets = [one objectForKey:@"sd"];

Note too that you should be using -objectForKey: for dictionary access (-valueForKey: will probably work in this context but it belongs to the key-value coding mechanism which is something a little different.)

(Also, not sure if this is just a paste issue, but your plist looks incomplete.)

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