OBJECTIVE-C Program Run Sequence _ program run order
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Procedure to run:
1, after the program started, find the main function--------program entrance
A Application object was created in the main function, and a delegate proxy was created for the object.
2, jump to application of the. m file,
* Create a good Window--uiview special subclass (remove board)
* Create a Uiviewcontroller object--------at this point just create a view controller and no view
The process from the previous line to the next line is an attempt to load the controller, that is, the following figure
* Give window a root view controller------The view is not empty at this time
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