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POaccess self.view.bounds in willRotateToInterfaceOrientation
 

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  1. POaccess self.view.bounds in willRotateToInterfaceOrientation
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    <p>In my app I want to keep an image centered after a device rotation. For this I'm using the willRotateToInterfaceOrientation and didRotateFromInterfaceOrientation methods to determine a translation-vector. I'm using the following code:</p> <pre><code>-(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration { NSLog(@"%s ...", __func__); NSLog(@"\t self.view=%@", self.view); NSLog(@"\t self.view.bounds=%@", self.view.bounds); NSLog(@"\t self.view.frame=%@", self.view.frame); NSLog(@"\t self.view.frame=%@", [[self view] frame]); // Save previous bounds to determine translation after rotation occurred. _previousViewBounds = self.view.bounds; } -(void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation { NSLog(@"%s ...", __func__); NSLog(@"\t self.view=%@", self.view); NSLog(@"\t self.view.bounds=%@", self.view.bounds); NSLog(@"\t self.view.frame=%@", self.view.frame); NSLog(@"\t self.view.frame=%@", [[self view] frame]); // Restore previous view.bounds and use new view.bounds to calculate translation. CGFloat tx = self.view.bounds.origin.x - _previousViewBounds.origin.x; CGFloat ty = self.view.bounds.origin.y - _previousViewBounds.origin.y; // ... do translation stuff ... } </code></pre> <p>I really don't understand why I can't access the self.view.bounds or self.view.frame members because my NSLog show the self.view exists. The following output is generated:</p> <pre><code>-[MapViewController willRotateToInterfaceOrientation:duration:] ... self.view=&lt;UIView: 0x685fcc0; frame = (0 0; 320 367); autoresize = RM+BM; layer = &lt;CALayer: 0x685fcf0&gt;&gt; self.view.bounds=(null) self.view.frame=(null) self.view.frame=(null) -[MapViewController didRotateFromInterfaceOrientation:] ... self.view=&lt;UIView: 0x685fcc0; frame = (0 0; 480 219); autoresize = RM+BM; layer = &lt;CALayer: 0x685fcf0&gt;&gt; self.view.bounds=(null) self.view.frame=(null) self.view.frame=(null) </code></pre> <p>Anybody ideas in what's going wrong or I'm missing, because this is really driving me nuts. Any advice, comments or help very much appreciated, thanks in advance!</p>
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      1. POaccess self.view.bounds in willRotateToInterfaceOrientation
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    1. COWhy not center the view in `init` and just set its autoresizing mask to `UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin`?
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      1. POaccess self.view.bounds in willRotateToInterfaceOrientation
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    2. COThanks for this tip! It really solved my rotation/view-center issue, however when I hide/show (using code) the Status-, Navigation- and TabBar in my ViewController, changing the available (image)view-size causes unused white space on the top/bottom of my view. I've the following view-object hierachy: ViewController.view>UIScrollView>UIImageView, where my UIImage contains a very large image which can be scrolled/zoomed. When I want to go full-screen (i.e. hiding the Status/Nav/TabBars) I recalculated the ScrollView-bounds in order to stay centered. This doesn't work after device rotation.
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      1. POaccess self.view.bounds in willRotateToInterfaceOrientation
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