Create a project with a single form using an empty project template of the project
First, create a new empty project.
Step 2: Create a Form file (note that you can directly create an object-c object by creating an object-c object)
Select view to create a form File
Note: The window option is a file based on the UIwindow object. The UIWindow object is mainly used as the parent container for setting display. The display of UIView depends on the window object.
In this example, the Root Window uses the default UIWindow
Step 3: Create a viewControl object
Check the check box With XIB for user interface.
The following is a list of created project files.
Step 4 Associate the xib file with the viewcontrol class
Select sustom Class on the Right of File's OwnerControlViewClass
Step 5 add the UIViewControllerViewController class attribute to the AppDelegate class
Step 6: Set the viewcontroller attribute in AppDelegate. m.