how do you change the root object type to an NSArray in a plist created in Xcode 4? It defaults to a type of NSDictionary, but I can't find a way to change it.
You cannot do that in Xcode4. What you can do is either create a plist by hand with an array as root object or take an existing one (of course this one should be an empty one, since converting one with rows makes no sense) and modify it by replacing <dict/> with <array/> (you may have to first convert it to an XML plist, if it is a binary one). Once the root object is an array, Xcode seems to keep it that way and when you select to add a row, it will immediately put a number as key (since nothing else is possible, of course). Maybe you should file a feature request at https://bugreport.apple.com
1- Create the PLIST in XCode. 2- Open the empty plist file created. 3- Right click on the white space of the plist. 4- Add Row. 5- In the Type column, select Array.
来源：https://stackoverflow.com/questions/5991021/how-do-you-change-a-plists-root-object-type-to-nsarray-in-xcode-4