Weird frame calculation for UITabBar - ios

Sometimes the app shrinks the width of the UITabBar, the 4 icons in the screenshot are usually distributed across the whole width.
Is anyone experiencing this and knows why it happens or even better how to fix/avoid it? I think it started happening with Swift, so maybe another of their awesome optimizations?
Also not sure how to reproduce it, happens around twice a week, maybe rotation, segue or app switch.
This screenshot is from an iPhone6 in portrait mode, but happens on other devices too.

I found the same behavior on iOS9 in two cases:
1) while immediate rotation during the pop-navigation in UINavigationController;
2) on rotation from landscape to portrait while watching full-screen video player and closing player after that.
To solve the problem on iOS8+ you should subclass UITabBarController and implement method from UIContentContainer protocol as follows:
- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
{
[super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
if (!self.tabBar.window) return;
[coordinator animateAlongsideTransition: ^(id<UIViewControllerTransitionCoordinatorContext> _Nonnull context) {
CGRect newBounds = self.tabBar.bounds;
newBounds.size.width = size.width;
self.tabBar.bounds = newBounds;
[self.view.superview setNeedsLayout];
}
completion: nil];
}
If you don't write return string you won't fix the 2nd issue.
Adding same in Swift:
extension UITabBarController {
public override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {
super.viewWillTransitionToSize(size, withTransitionCoordinator: coordinator)
if let _ = self.tabBar.window {
coordinator.animateAlongsideTransition( { (context) in
self.tabBar.bounds.size.width = size.width
self.view.superview?.setNeedsLayout()
}, completion: nil)
}
}
}

Related

How can I set the same transformation for all the cells in a collection view? [duplicate]

I have one UIView which is not using Auto-Layout and some components are displayed based on their percent of X and Y co-ordinates from the main view.
Previously I would have run a function to update their positions in didRotateFromInterfaceOrientation however I see this is now deprecated in iOS8.
I've taken a look at viewWillTransitionToSize but it's giving weird results, and there doesn't appear to be a viewDidtransitionToSize function.
Is there an easy way (in Swift) to run a function after a device rotation?
The viewWillTransitionToSize delegate method gets called with a UIViewControllerTransitionCoordinator conforming object. A method that protocol declares is animateAlongsideTransition(_:animation, completion:). You can use that to have code execute after the transition is complete.
override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
super.viewWillTransition(to: size, with: coordinator)
coordinator.animate(alongsideTransition: nil) { _ in
// Your code here
}
}
Although not asked for here Objective C version:
- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator {
[coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> _Nonnull context) {
// change any properties on your views
} completion:^(id<UIViewControllerTransitionCoordinatorContext> _Nonnull context) {
UIDeviceOrientation orientation = [UIDevice currentDevice].orientation;
if( UIDeviceOrientationIsPortrait(orientation) ) {
NSLog(#"portrait");
} else {
NSLog(#"landscape");
}
}];
}

Swift 3 -Flip entire screen/view On Orientation change

I need to a way to constantly monitor if the user has rotated the iPad.
UserDidRotate() {
if(orientation = portrait.upsideDown){
//
//Code that will Present View upside down...
//
}
else if(orientation = portrait){
//
//Code that will Present View right side up...
//
}
}
How can I check for orientation change and also manually present the view upside down for my Swift 3 app?
EDIT:
I have tried:
override func viewWillTransition(to size: CGSize, with coordinator:
UIViewControllerTransitionCoordinator){}
and that method is never hit.
Try:
self.view.transform = self.view.transform.rotated(by: CGFloat(M_PI))

Different size classes for iPad portrait and landscape modes with containerviews

I've found this question and I've tried to implement the solution that has been given. However I run into a problem.
My initial view controller has two container views who both have their own view controller. I've created a root view controller that is assigned to the initial view controller. The code in this class looks like this.
class RootViewController: UIViewController {
var willTransitionToPortrait: Bool!
var traitCollection_CompactRegular: UITraitCollection!
var traitCollection_AnyAny: UITraitCollection!
override func viewDidLoad() {
super.viewDidLoad()
setupReferenceSizeClasses()
// Do any additional setup after loading the view.
}
override func viewWillAppear(animated: Bool) {
willTransitionToPortrait = self.view.frame.size.height > self.view.frame.size.width
}
override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {
willTransitionToPortrait = size.height > size.width
}
func setupReferenceSizeClasses(){
let traitCollection_hCompact = UITraitCollection(horizontalSizeClass: .Compact)
let traitCollection_vRegular = UITraitCollection(verticalSizeClass: .Regular)
traitCollection_CompactRegular = UITraitCollection(traitsFromCollections: [traitCollection_hCompact, traitCollection_vRegular])
let traitCollection_hAny = UITraitCollection(horizontalSizeClass: .Unspecified)
let traitCollection_vAny = UITraitCollection(verticalSizeClass: .Unspecified)
traitCollection_AnyAny = UITraitCollection(traitsFromCollections: [traitCollection_hAny, traitCollection_vAny])
}
override func overrideTraitCollectionForChildViewController(childViewController: UIViewController) -> UITraitCollection? {
let traitCollectionForOverride = ((willTransitionToPortrait) != nil) ? traitCollection_CompactRegular : traitCollection_AnyAny
return traitCollectionForOverride;
}
However when I run it the size class won't respons like it should. One of the container view controllers will start acting weird in both landscape and portrait mode like can be seen below.
When I don't assign the rootviewcontroller it will look like this
While it should look like this in portrait mode
Does anyone know what might be going wrong here? Why it doesn't change the size class like desired.
EDIT
Like #Muhammad Yawar Ali asked here are screenshots from the position of all the size classes I've set. I have no warnings or errors on any constraints so these screenshots contain the updated views.
I hope this shows everything that is needed.
EDIT:
for some reason I'm unable to put in all the screenshots
On the viewWillTransitionToSize you need to call also super, to pass the event to the next responder (your rootviewcontroller)...
override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {
super.viewWillTransitionToSize(size, withTransitionCoordinator: coordinator)
willTransitionToPortrait = size.height > size.width
}
Realize this is over two years old but...
I just ran across what I think is a similar issue. What you may be forgetting is that 'overrideTraitCollectionForChildViewController' only overrides the views children, so this method won't do anything with the containers since they are located at the root.
I solved this putting my two containers in a UIStackView in Interface Builder and made a property of this stack in code and then updated the axis depending on the orientation. For example, in Objective-C:
#property (weak, nonatomic) IBOutlet UIStackView *rootStack;
// ...
- (UITraitCollection *)overrideTraitCollectionForChildViewController:(UIViewController *)childViewController
{
if (UI_USER_INTERFACE_IDIOM() != UIUserInterfaceIdiomPad) {
return [super overrideTraitCollectionForChildViewController:childViewController];
}
if (CGRectGetWidth(self.view.bounds) < CGRectGetHeight(self.view.bounds)) {
self.rootStack.axis = UILayoutConstraintAxisVertical;
return [UITraitCollection traitCollectionWithHorizontalSizeClass:UIUserInterfaceSizeClassCompact];
}
else {
self.rootStack.axis = UILayoutConstraintAxisHorizontal;
return [UITraitCollection traitCollectionWithHorizontalSizeClass:UIUserInterfaceSizeClassRegular];
}
If you have any constraints that are different between portrait and landscape you will need to adjust those in code as well.
I suppose you could also solve this by embedding the view controller with the containers in another view controller.
I have cloned your code from repository : https://github.com/MaikoHermans/sizeClasses.git
And editted code put the below code in you controller it will work fine & will not effect your design in iPads.
import UIKit
class RootViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func overrideTraitCollectionForChildViewController(childViewController: UIViewController) -> UITraitCollection? {
if view.bounds.width < view.bounds.height {
return UITraitCollection(horizontalSizeClass: .Unspecified)
} else {
return UITraitCollection(horizontalSizeClass: .Regular)
}
}
}
You can try with this code but There is an issue i believe its not updating traits properly for ipads and view layout remains same but looks good. I have tried multiple ways but not succeeded yet will update my answer.

iOS 9 Today Widget not calling viewDidLoad

The today widget is drawn correctly when it is added to the today view. But if you user comes back to it later, the viewDidLoad function is not called and it is showing stale data. Should viewDidLoad be called everytime? Is there an iOS 9 / Xcode 7 beta 6 bug?
Edit:
Added that widgetPerformUpdateWithCompletionHandler not called either. I have breakpoints set and print functions
func widgetPerformUpdateWithCompletionHandler(completionHandler: ((NCUpdateResult) -> Void)) {
print("in widgetPerformUpdateWithCompletionHandler")
fetch()
completionHandler(NCUpdateResult.NewData)
}
When you scroll a widget off and back on screen, the same controller instance will be reused for a short amount of time (appears to be ~30 seconds in my testing), and viewDidLoad and widgetPerformUpdateWithCompletionHandler: will not be called.
However, viewWillAppear and viewDidAppear will be called every time your widget is displayed.
Posting my own answer, but would like discussion on this code - should it be there or how to properly do it?. We had in this method, and by removing it the widget began to work correctly
override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator)
{
super.viewWillTransitionToSize(size, withTransitionCoordinator: coordinator)
if let safeCoordinator = coordinator as UIViewControllerTransitionCoordinator?
{
print("coordinator != nil")
safeCoordinator.animateAlongsideTransition({ context in
self.tableView.frame = CGRectMake(0, 0, size.width, size.height)
}, completion: nil)
}
else
{
print("coordinator == nil")
}
}

iOS: How to run a function after Device has Rotated (Swift)

I have one UIView which is not using Auto-Layout and some components are displayed based on their percent of X and Y co-ordinates from the main view.
Previously I would have run a function to update their positions in didRotateFromInterfaceOrientation however I see this is now deprecated in iOS8.
I've taken a look at viewWillTransitionToSize but it's giving weird results, and there doesn't appear to be a viewDidtransitionToSize function.
Is there an easy way (in Swift) to run a function after a device rotation?
The viewWillTransitionToSize delegate method gets called with a UIViewControllerTransitionCoordinator conforming object. A method that protocol declares is animateAlongsideTransition(_:animation, completion:). You can use that to have code execute after the transition is complete.
override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
super.viewWillTransition(to: size, with: coordinator)
coordinator.animate(alongsideTransition: nil) { _ in
// Your code here
}
}
Although not asked for here Objective C version:
- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator {
[coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> _Nonnull context) {
// change any properties on your views
} completion:^(id<UIViewControllerTransitionCoordinatorContext> _Nonnull context) {
UIDeviceOrientation orientation = [UIDevice currentDevice].orientation;
if( UIDeviceOrientationIsPortrait(orientation) ) {
NSLog(#"portrait");
} else {
NSLog(#"landscape");
}
}];
}

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