I have viewController No.1, which has a subView showing. And after I push to another viewController, No.2, this subView does not shown on the screen anymore, which makes sense, since I have pushed to another VC.
However, I hope to keep this subView on the screen even though I am in a pushed viewController now. So I wonder how I can achieve this?
This will work:
//Create a view in the center of the screen
UIView *view = [[UIView alloc]initWithFrame:CGRectMake(([UIScreen mainScreen].bounds.size.width/2)-50, ([UIScreen mainScreen].bounds.size.height/2)-50, 100, 100)];
view.backgroundColor = [UIColor redColor];
//Create a window class
UIWindow* window = [[UIApplication sharedApplication].windows objectAtIndex:0];
//Pick a level
window.windowLevel = UIWindowLevelStatusBar;
//Add the view
[window addSubview:view];
Related
When I swipe and hide the navigation bar with the hidesBarsOnSwipe property the status bar has a clear background. How can I set the background of the status bar to the same color as the navigation bar? Here are a few pictures showing my problem, this is all contained in a UITableViewController.
Separate
Separate picture, looks like one big one.
I've come across the same issue, and was able to solve it. I'm fairly new to iOS dev, and I don't imagine this solution to be foolproof. I couldn't find any good answers elsewhere, so here's how I overcame it:
I converted from a UITableViewController over to UIViewController with a nested UITableView. Note, double check that the delegate to the child tableview is set to the UIViewController.
I Added a view with a height of 20px and a background colour that you want to set as the "background" to the status bar. Set the constraints on that view as follows:
On your table view, set the constrains to be basically full screen. One important note here, the top constraint is to "Top Layout Guide.Top" and not to "Top Layout Guide.Bottom". By default I believe this constraint ties to the bottom. Double clicking on the constraint allows you to adjust it to the top. Without this, any table header cells weren't positioned properly for me
Hope that helps.
Adding to George Huber's answer. I solved this issue programmatically by adding a 20pt height UIView as a subview of the navigationController's view property -- in viewDidLoad method.
- (void)viewDidLoad
{
[super viewDidLoad];
UIView *statusBarBG = [[UIView alloc] initWithFrame:CGRectMake(0, 0, CGRectGetWidth(self.view.bounds), 20)];
statusBarBG.backgroundColor = [UIColor navBar];
[self.navigationController.view addSubview:statusBarBG];
// REST OF CODE
}
Per skg's answer, I add a relative height for status bar according to iOS version.
self.navigationController.hidesBarsOnSwipe = true;
// add a UIView as subView to navigationController
CGFloat statusBarHeight;
if (#available(iOS 13, *)) {
NSArray *windows = UIApplication.sharedApplication.windows;
UIWindow *keyWindow = nil;
for (UIWindow *window in windows) {
if (window.isKeyWindow) {
keyWindow = window;
break;
}
}
statusBarHeight = keyWindow.windowScene.statusBarManager.statusBarFrame.size.height;
NSLog(#"statusBarHeight: %f", statusBarHeight);
} else {
statusBarHeight = UIApplication.sharedApplication.statusBarFrame.size.height;
}
UIView *statusBarBG = [[UIView alloc] initWithFrame:CGRectMake(0, 0, CGRectGetWidth(self.view.bounds), statusBarHeight)];
statusBarBG.backgroundColor = [UIColor systemBackgroundColor];
[self.navigationController.view addSubview:statusBarBG];
I'm presenting a view controller using the transitioning delegate modally from my root view controller.
UIWindow *window = [[[UIApplication sharedApplication] delegate] window];
UIViewController *rootVC = [window rootViewController];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:authVC];
navController.modalPresentationStyle = UIModalPresentationCustom;
navController.navigationBar.translucent = NO;
navController.transitioningDelegate = self;
[rootVC presentViewController:navController animated:YES completion:nil];
My transitioning delegate adds the view as follows, where authorizationVC is the login view pictured in the screenshots.
UIView *containerView = [transitionContext containerView];
[containerView addSubview:blurredView];
[containerView insertSubview:_authorizationVC.view aboveSubview:blurredView];
_authorizationVC.view.frame = CGRectMake(10, 30, 300, 450);
At first, the view animates in, and the navigation bar is full height, what I believe to be 64 pixels (44 for the nav bar and 20 for the status bar).
As soon as my animation completes, the nav bar shrinks to 44 pixels. The transition is jarring. The content inside my view controller is unaffected.
How do I avoid this jittering navigation bar? The second image is what I'd like to achieve.
Set all the properties of the view before adding it to its superview.
UIView *containerView = [transitionContext containerView];
_authorizationVC.view.frame = CGRectMake(10, 30, 300, 450); /// Change the frame FIRST!
[containerView addSubview:blurredView];
[containerView insertSubview:_authorizationVC.view aboveSubview:blurredView];
Voila! The nav bar acts as expected.
I would avoid using a UINavigationController if you don't really need it.
The UINavigationController takes into account the topLayoutGuide in the way it sizes the navigation bar. If you just want the coloured bar and close button, I'd simplify it and use your own views for that.
If you must use a UINavigationController you could try playing with the status bar's appearance and see how it affects the navigation controller's presentation.
I have an UImage that I need half on the navigation bar and half on the main screen. I have added a Navigation Controller on my project so now I have a nav bar on all screens. I need a square image to go half on the navigation controller and half on the main screen.
In XCODE I have successfully put an UImageView over the nav bar and the main screen but when i put an image on it i only appears in the part thats over the main screen and not over the navigation bar. I don't want to split the image so I can use Navigationbar.image control - is there another way ?
Instead of adding it to viewController, add it to window.
UIView *view =[[UIView alloc] initWithFrame:CGRectMake(40, 30,240,60)];
view.backgroundColor =[UIColor greenColor];
[[[UIApplication sharedApplication] delegate].window addSubview:view];
As you might have noticed the UINavigationBar appears on top of everything you have within your UIViewController's view.
One way of overcoming this is by adding your UIImageView to the keyWindow like so:
UIImageView * imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
imageView.image = [UIImage imageNamed:#"myImage"];
[[UIApplication sharedApplication].keyWindow addSubview:imageView];
I am working on an iPad app with a few different modal views, and this code is pretty common:
UIViewController *v1 = [[UIViewController alloc] init];
UINavigationController *nav1 = [[UINavigationController alloc] initWithRootViewController:v1];
nav1.modalPresentationStyle = UIModalPresentationFormSheet;
[self presentViewController:nav1 animated:YES completion:nil];
It could be that I am doing this wrong, but this is how I am presenting a navController-nested vc modally.
The problem is that within the v1 class, any reference to self.frame/bounds results in full screen dimensions:768x1024. Even though the navController clearly isn't being displayed with that size.
What should I be doing to make it so that the v1 vc knows how big it actually is? So that if I wanted to add, say, a tableView, it would know how big it should be?
Thanks!
EDIT:
I have tried a few more things, and still don't have a solution to this problem. I have made a simple sample project to illustrate the problem I am having. I just have one view and this is the core of the code:
- (void)viewDidLoad
{
[super viewDidLoad];
NSLog(#"Frame: %#", NSStringFromCGRect(self.view.frame));
NSLog(#"Bounds: %#", NSStringFromCGRect(self.view.bounds));
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake(self.view.frame.size.width - 400, 0, 400, 400);
button.backgroundColor = [UIColor redColor];
[button addTarget:self action:#selector(presentModal) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
}
- (void)presentModal {
SSViewController *view = [[SSViewController alloc] init];
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:view];
nav.modalPresentationStyle = UIModalPresentationFormSheet;
[self.navigationController presentViewController:nav animated:YES completion:nil];
}
When this view loads, I have a big red button that is up against the top right corner of my view. When I press the button, it loads the same VC in a modal view embedded in a navController. The button shows up nearly off screen because the frame hasn't changed. It still shows as full screen. Here is a link to the project.
Not sure why you're having the issue you're having. I'm using the following code:
- (void)presentNewView {
NewViewController *newVC = [[NewViewController alloc] initWithNibName:nil bundle:nil];
newVC.view.backgroundColor = [UIColor redColor];
UINavigationController *newNC = [[UINavigationController alloc] initWithRootViewController:newVC];
newNC.modalPresentationStyle = UIModalPresentationFormSheet;
[self.navigationController presentViewController:newNC animated:YES completion:NULL];
}
.. it results in the following in the simulator:
.. and when I print out the first ViewController's frame and bounds (I thought it might be an issue with the two) I get the following:
frame height: 1024.000000
frame width: 768.000000
bounds height: 1024.000000
bounds width: 768.000000
.. and when I print out the presented ViewController's frame/bounds I get the following:
frame height: 620.000000
frame width: 540.000000
bounds height: 620.000000
bounds width: 540.000000
How are you determining the size of the frame exactly? Any reference within the v1 class that was presented modally SHOULD know its actual size, like I showed above.
EDIT
The major difference I found with my code and yours, is that in my code I created a subclass of my view controller "NewViewController" and was printing out the frame from within that class. The class itself seems to be aware of its correct bounds, but the class the presented it seems not to be. This is demonstrated by printing the view property from the ViewController class that presented it:
NewViewController's View From Presenting Class: frame = (0 0; 768 1024)
..compared to printing out the self.view from within the ViewDidAppear method of NewViewController itself:
NewViewController's View Did Appear: frame = (0 0; 540 576)
Moral of the story, if you are going to be presenting a UIViewController in the way you've shown, you're likely going to want to subclass UIViewController anyway so you can customize it however you want, so within that file if you reference self.view or self.bounds you will be getting the ACTUAL view/bounds.
EDIT #2
Based on the project you provided, the reason why you are having that issue is because you are printing out the frame/bounds of the view in viewDidLoad as opposed to viewDid/viewWillAppear. Adding those NSLog statements to VWA or VDA provides you the correct frame, so as I said in my initial edit, you should be fine accessing the view of the modal correctly at that point.
It's a new feature of iOS7. If you embed a UIViewController in navigation bar, it won't get smaller, because by default navigation bar is translucent.
You will see it if you change the background color of a view controller, that the top part of it is actually behind the navigation bar.
To lay out the v1 view controller underneath the navigation bar, you can use following code:
if ([v1 respondsToSelector:#selector(edgesForExtendedLayout)]) {
v1.edgesForExtendedLayout = UIRectEdgeNone;
}
It will behave just as in iOS6.
when presenting view controllers modally from a child view controller (one that has lass than the full screen and is a child of another view controller..) it is important to do this so that the modal controller knows the size of the canvas its appearing in
childViewController.definesPresentationContext = YES;
modalViewControllerWhichIsAboutToBePushed.modalPresentationStyle = UIModalPresentationCurrentContext
I am using the following code to create a view and put it on top:
UIWindow* mainWindow = [[UIApplication sharedApplication] keyWindow];
CGRect viewRect = mainWindow.frame;
topView = [[UIView alloc] initWithFrame:viewRect];
[topView setBackgroundColor:[UIColor colorWithWhite:0.2 alpha:0.4]];
[mainWindow addSubview:topView];
It works perfectly but my problem is if I write anything one the view(like using a Label) and my device is in a landscape position, the text is in vertical position. I've attached a picture to make it more clear. Is there any way to fix it?
EDIT: if I use UIApplication.sharedApplication.keyWindow.rootViewController instead of mainWindow, I will get this:
See this answer:
View on top of everything: UIWindow subview VS UIViewController subview
Basically, only the first subview of the main window gets rotation events, so you have to do it some other way.
There's no way to fix it without adding the given view to a View Controller (UIWindow was never meant to handle rotation, and has no logic to do so).
The wonky view rotation results you're experiencing are actually the result of UIView's default autoresizingMask's
topView = [[UIView alloc] initWithFrame:viewRect];
[topView setBackgroundColor:[UIColor colorWithWhite:0.2 alpha:0.4]];
[topViewsetAutoresizingMask:(UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth)];