How to add images in Xcode:
New Group images(in fact it shows as a folder)->drag the images to that group->select "copy to destination" in the pop-up window
How to add a new tab to tab bar controller:
drag a view controller to the stroyboard->right click the tab bar controller->(鼠标在黑龙江后面那个点会出现add)add new view controller and connect it to the new controller by dragging a line.

Create a plist:
http://nscookbook.com/2013/02/ios-programming-recipe-13-using-property-lists-plists/

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