plist文件是标准的xml文件，在cocoa中可以很简单地使用。这里介绍一下使用方法：
以下代码在Mac和iPhone中均适用。
写入plist文件：
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NSMutableDictionary* dict = [ [ NSMutableDictionary alloc ] initWithContentsOfFile:@"/Sample.plist" ];
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[ dict setObject:@"Yes" forKey:@"RestartSpringBoard" ];
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[ dict writeToFile:@"/Sample.plist" atomically:YES ];
读取plist文件：
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NSMutableDictionary* dict = [ [ NSMutableDictionary alloc ] initWithContentsOfFile:@"/Sample.plist" ];
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NSString* object = [ dict objectForKey:@"RestartSpringBoard" ];