使用iOS SDK在运行时创建plist？

我是 iPhone 开发新手。我想知道是否有任何示例 Objective-C 代码可以通过从网络服务器获取数据来在运行时创建 plist，并且我想知道数据的格式应该是什么，以便我可以在运行时轻松创建 plist。

非常简单NS词典 http://developer.apple.com/library/ios/#documentation/Cocoa/Reference/Foundation/Classes/nsdictionary_Class/Reference/Reference.html:

#define DOCUMENTS_PATH [NSSearchPathForDirectoriesInDomains(NSDocumentsDirectory, NSUserDomainMask, YES) objectAtIndex:0]

NSDictionary *myDictionary = [self parseWebResult];

// note that myDictionary must only contain values of string, 
// int, bool, array (once again containing only the same types), 
// and other primitive types (I believe NSDates are valid too).
[myDictionary writeToFile:[DOCUMENTS_PATH stringByAppendingPathComponent:@"myDict.plist"] atomically:YES];

// reading in the dictionary
myDictionary = [NSDictionary dictionaryWithContentsOfFile:[DOCUMENTS_PATH stringByAppendingPathComponent:@"myDict.plist"]];