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iOS Build a Simple iPhone App (iOS7) Understanding Views and View Controllers CGRect and Frame

Chee Mervin
PLUS
Chee Mervin
Courses Plus Student 4,195 Points
Posted by Chee Mervin
Chee Mervin
Courses Plus Student 4,195 Points

CGRectMake implementation in viewDidLoad and viewDidAppear.

Hi guys, still a bit unsure

Just want to check with you guys, I'm still unsure why I am able to put

self.showQuote.frame = CGRectMake(100, 250, 280, 44);

in the viewDidLoad section of the code challenge and get it right.

As the video for this topic mentioned that having the CGRectMake(x,y,width,height) in the viewDidLoad section would not work as it would load the (x,y,width,height) directly from the storyboard instead. Hence the CGRectMake has to be implemented under a viewDidAppear.

Or are there certain exceptions in coding CGRectMake that I'm not aware of here? Thanks!

Cheers!

  • mervin

2 Answers

Fred Lawton
Fred Lawton
5,904 Points

I don't recall the video, but I'm not sure why it would behave as you say the video described.

Maybe the following will help. Look at Figure 4-1 in this link: https://developer.apple.com/library/ios/featuredarticles/ViewControllerPGforiPhoneOS/ViewLoadingandUnloading/ViewLoadingandUnloading.html

It looks like the loadView method is called if there is not a view in memory when a view property is accessed. Then either the storyboard or a custom loadView method is used to load information. After this the viewDidLoad is called.

After viewDidLoad is called, viewWillAppear is called. Hopefully this pic is accurate: http://stackoverflow.com/questions/5562938/looking-to-understand-the-ios-uiviewcontroller-lifecycle.

Notice in the pic, if the view already exists in memory, then viewDidLoad is not called and the process goes to viewDidAppear.

Chee Mervin
PLUS
Chee Mervin
Courses Plus Student 4,195 Points
Chee Mervin
Chee Mervin
Courses Plus Student 4,195 Points

Ah that clears it up, thanks Fred!. =)

Cheers

  • mervin