objective-c 从 plist 文件中读取数据
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Reading data from a plist file
提问by K2Digital
I'm trying to implement a Save State for my iPhone App.
我正在尝试为我的 iPhone 应用程序实现一个保存状态。
I've got a plist file called SaveData.plist and I can read it in via the following
我有一个名为 SaveData.plist 的 plist 文件，我可以通过以下方式读取它
NSString *pListPath2 = [bundle pathForResource:@"SaveData" ofType:@"plist"];
NSDictionary *dictionary2 = [[NSDictionary alloc] initWithContentsOfFile:pListPath2];
self.SaveData = dictionary2;
[dictionary release];
The Plist file has members
Plist 文件有成员
SavedGame which is a Boolean to tell the app if there really is valid data here (if they did not exit the app in the middle of a game, I don't want their to be a Restore Point.
SavedGame 这是一个布尔值，用于告诉应用程序这里是否真的有有效数据（如果他们没有在游戏中间退出应用程序，我不希望它们成为还原点。
Score which is an NSNumber. Time which is an NSNumber
分数是一个 NSNumber。时间是一个 NSNumber
Playfield which is a 16 element array of NSNumbers
Playfield 是一个 16 元素的 NSNumbers 数组
How do I access those elements inside of the NSDictionary?
如何访问 NSDictionary 中的这些元素？
回答by Jeff Hellman
Try [NSDictionary objectForKey:]
尝试 [NSDictionary objectForKey:]
Where Key is the name of the member in the plist.
其中 Key 是 plist 中成员的名称。
For example:
例如：
BOOL save = [[dictionary2 objectForKey:@"SavedGame"] boolValue];
will store the object stored in the plist for the key SavedGame into a new BOOL named save.
将存储在键 SavedGame 的 plist 中的对象存储到名为 save 的新 BOOL 中。
I imagine that your SavedGame Boolean is actually stored in the NSDictionaryas an NSNumber, hence the use of boolValue to get the Boolean Value of the NSNumber.
我想，你的SavedGame布尔实际上是存储在NSDictionary作为NSNumber，因此，使用boolValue来获得的布尔值NSNumber。
Try this documentation: Apple NSDictionary Reference.
试试这个文档： Apple NSDictionary Reference。
回答by Shahid Aslam
For Setting Bool Value You can Use :
要设置布尔值，您可以使用：
[Dictionary setBool:TRUE forKey:@"preference"];
[Dictionary setBool:TRUE forKey:@"preference"];
For Getting Bool value you can use :
对于获取布尔值，您可以使用：
[Dictionary boolForKey:@"preference"];
[Dictionary boolForKey:@"preference"];
