How to get the actual [UIScreen mainScreen] frame size?

uiview frame uiapplication
runmad picture runmad · Mar 1, 2011 · Viewed 66.8k times · Source

I'm a bit annoyed. I have an app with the statusbar visible in the main window. Since I would like to setup my views and their frame sizes dynamically (perhaps the status bar takes up 40 pixels during a phone call, for example).

I can do one of the two:

[[UIScreen mainScreen] bounds];
[[UIScreen mainScreen] applicationFrame];

The really annoying this is these two output two different sets of values, each equally as useless.

bounds will output: {{0, 0}, {320, 480}} while
applicationFrame will output {{0, 20}, {320, 460}}

As you can see, bounds gives the correct y origin (0 starts from right below the statusbar) but then gives a height of 480, which is incorrect. It should be 460, since the statusbar is visible. Then we have applicationFrame which starts 20 pixels below the statusbar (so there's a cap), but then gives the correct height. But that's not very useful when it's then pushed down 20 pixels anyway.

Any help?

Answer

Vincent Bernier picture Vincent Bernier · Aug 13, 2012

Actually that is very usefull.
When you ask a UIScreen for it's Bounds you get the bounds of the screen, which is the whole device screen. (the status bar is part of the screen)
But if you ask a UIScreen to tell you where and how big can be the root view of your application asking for the applicationFrame is usefull. There is no direct relationship between the 2 calls except that the applicationFrame is returned in the UIScreen bounds coordinate system. (But the status bar is not part of your application, that explain the different result)

applicationFrame
The frame rectangle to use for your application’s window. (read-only)
@property(nonatomic, readonly) CGRect applicationFrame
Discussion
This property contains the screen bounds minus the area occupied by the status bar, if it is visible. Using this property is the recommended way to retrieve your application’s initial window size. The rectangle is specified in points.

Related questions

UIView frame, bounds and center

I would like to know how to use these properties in the right manner. As I understand, frame can be used from the container of the view I am creating. It sets the view position relative to the container view. …

Read More
Simple way to change the position of UIView?

I change the position of a UIView with following codes without changing size of the view. CGRect f = aView.frame; f.origin.x = 100; // new x f.origin.y = 200; // new y aView.frame = f; Is there more simple way to change …

Read More
UIView's frame, bounds, center, origin, when to use what?

UIView has the properties frame, bounds, center, and origin, and they all seem to be interrelated. Most of the time, I deal with frame when setting the position and size of a UIView. I understand that frame is using global …

Read More