If I have a navigation bar, then a small (header) view, and then a table view, is there a way that I can have a search bar (when a bar button item is pressed) drop down I between the navigation bar and the view below?
I have tried just shifting the view between the navigation bar and table view down, but it just goes over the table view instead of pushing the table view down, or else it would work great.
Any help is appreciated! Sorry if anything is confusing just let me know if I can clarify anything.
If you want the search bar to "float" over the tableView on scroll, but when you scroll to the top of the list, then search bar doesn't overlap the tableView then you'll need to change the tableView's contentInsets to accommodate the search bar.
Something like:
tableView.contentInsets = UIEdgeInsets(x: 0.0, y: barView.bounds.size.height, 0.0, 0.0)
Then you'll need to scroll your tableView up to the top:
tableView.contentOffset = CGPoint(x: 0.0, y: -barView.bounds.size.height)
Related
I have a Navigation Controller and a Collection View under it inside my app. And there is a problem: I use large title inside my Navigation bar, so everything inside is not static. When I scroll the collection view cells, the title (I created it manually using UILabel() to move it as I want inside the navigation bar) and buttons move up and the navigation bar takes form of iOS 10 navigation bar, I mean its height. You can see it here:
The normal state of my Navigation Bar with "Prefer large titles" On:
It happens when I scroll my Collection View, everything goes up:
So the question is simple: how to make the force constant height for the navigation bar? I want it to become fixed even while scrolling. Are there any ideas? Is it possible?
And the second question, if the first is impossible: Another solution for my problem is to make the Navigation Bar with "Prefer large titles" Off bigger. I tried this code:
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
let height: CGFloat = 50 //whatever height you want to add to the existing height
let bounds = self.navigationController!.navigationBar.bounds
self.navigationController?.navigationBar.frame = CGRect(x: 0, y: 0, width: bounds.width, height: bounds.height + height)
}
but it worked only for large titles. So how can I make the navigation bar bigger?
Yes, you can make it fixed. It will not scroll if the very first view in the view hierarchy is not a CollectionView/TableView (ScrollView).
Using Storyboard/Xib:
Consider the following image where a tableView and button are added in scene. Here the navigation bar will collapse on scroll of tableView because tableView is the very first view in viewController's containerView hierarchy attached to the navigation bar.
Now to make the navigation bar fixed, if we just change the order of tableView and button as below, it will disable the collapsing of navigation bar.
To change the order of the view, you have to click, hold and move up/down.
If you have only CollectionView in this scene then you can add a placeholder view at the top and set its height to zero as below,
Programmatically:
If you are setting up view's programmatically then you just need to add a placeholder view at the top or add tableView/collection after adding other views.
e.g,
self.view.addSubview(UIView(frame: .zero))
self.view.addSubview(tableView) // or collectionView
I am displaying a popover (Present as Popover) as a dropdown when the user clicks on nav bar title (which is a label + an image). I was not able to set the nav bar title as popover's anchor view. So for anchor view, I added a clear 1x1 button that sits right below the nav bar (button.top = safe area.top)
I am able to position the popover along the y-axis by changing the y value in sourceRect.
popover?.sourceRect = CGRect(x: 0, y: -10, width: 1, height: 1)
It looks good, except I don't want the arrow in the popover. So I added this line of code.
popover?.permittedArrowDirections = UIPopoverArrowDirection(rawValue: 0)
Now, I am not able to position the popover correctly. It doesn't matter what y value I specify in sourceRect, the popover stays at the same place.
What am I doing wrong?
Thanks.
The problem is that that is not how to suppress the arrow. The right way is to provide a custom UIPopoverBackgroundView that doesn’t draw the arrow.
However it would be better not to do this at all. Popovers have arrows. If you don’t want the arrow, don’t use a popover. Write a custom presented view controller instead.
I want to have the Tab Bar at the top of the screen. One post suggested to do the followings (I put the following code in the viewDidLoad() of the UITabBarController) :
CODE
let tabBar = self.tabBar
// yStatusBar indicates the height of the status bar
let yStatusBar = UIApplication.sharedApplication().statusBarFrame.size.height
// Set the size and the position in the screen of the tab bar
tabBar.frame = CGRectMake(0, yStatusBar, tabBar.frame.size.width, tabBar.frame.size.height)
There are 2 problems with this solution:
The bottom of the screen is left with a black region where the tab bar was
The Tab bar covers the view at the top of the screen - the constraints of that view is relative to the device but they should be relative to the Tab bar. However when the screen is designed in the IB there is no Tab bar to relate to.
Is there a way to overcome these problems? P.S. I am new to IOS
let tabBar = self.tabBarController?.tabBar
// Set the size and the position in the screen of the tab bar
tabBar?.frame = CGRect(x: 0, y: self.view.frame.height, width: (tabBar?.frame.size.width)!, height: (tabBar?.frame.size.height)!)
Although it is against the human interface guidelines there exist a hack if you really want to.
You could create a blank UIView in your storyboard (with proper constraints set up) that would essentially be the placeholder for the tabBar when loaded.
You then set top constraints for your other views relative to this view that you have setup.
This works, but probably not best practice to do so
In my view controller I have a UIView (drawer view) that sits below the visible screen with just the top poking out (a tab). This tab can be tapped and the UIView will animate up and fill most of the screen. The view is set like so:
drawerView = DrawerView(frame: CGRect(x: 0, y: UIScreen.mainScreen().bounds.size.height - DrawerView.submitTabHeight, width: UIScreen.mainScreen().bounds.size.width, height: UIScreen.mainScreen().bounds.height*0.75))
drawerView.delegate = self
view.addSubview(drawerView)
Below is a screenshot of the setup:
I have to present this view controller from a tab bar controller. I want to hide the tab when the view controller is loaded and I did this by setting Hide Bottom Bar on Push in the IB. The problem I have now is that when I push the view controller the drawer view is temporarily out of place. It is higher up than it should be by the height of the tab bar (shown by the dotted line on the screen). It then jumps back to the actual position it should be in. Any ideas what I might be doing wrong here? Any pointers on this would be greatly appreciated! Thanks
Just hide the tabbar before pushing the viewcontroller.
if (self.tabBarController) {
self.tabBarController!.tabBar.hidden = true;
}
In my UIViewController I have UIImageView that takes up the full size of the controller (screen) and serves as a background. On top of UIImageView I have a UITableView with a clear background. I set the navigation bar to translucent like this:
self.navigationController.navigationBar.translucent = YES;
UIImageView is underneath the navigation bar as I want it to be. Unfortunately the same happens to UITableView. I want to put UITableView at the bottom of navigation bar, leaving UIImageView underneath. If I set:
[self setEdgesForExtendedLayout:UIRectEdgeBottom]
then UITableView is at the bottom of the navigation bar, but the same happens also to UIImageView. What would be the easiest solution to leave UIImageView underneath the navigation bar and push down the UITableView at the bottom of the navigation bar?
By default in iOS 7 the content extends to the top and bottom of the screen, underneath any navigation bars, tool bars, or tab bars. If you were to set the frame of the table view to be start after the navigation bar, the content of the table view would not scroll beneath the navigation bar providing the nice blur effect.
What you'll probably want to do instead, is keep the y origin of your table view at 0, underneath the navigation bar, and set the content inset so the content starts after the navigation bar.
This is pretty simple. If you're using auto layout the top layout guide of the view controller will recognise the height of the status bar and navigation bar so you don't need to calculate this yourself. The bottom of the navigation bar should end at 66.
//Using Auto Layout
CGFloat navigationBarHeight = self.topLayoutGuide.length;
//Not using Auto Layout
UINavigationBar *nav = self.navigationController.navigationBar;
CGFloat navigationBarHeight = nav.frame.origin.y + nav.frame.size.height;
myTableView.contentInset = UIEdgeInsetsMake(navigationBarHeight, 0, 0, 0)
And of course if you actually do want the frame to start after the navigation bar the height above stays the same, you just need to manually set the frame of the table view.
CGRect tableViewFrame = self.view.bounds;
tableViewFrame.origin = CGPointMake(tableViewFrame.origin.x, navigationBarHeight);
tableViewFrame.size = CGSizeMake(tableViewFrame.size.width, tableViewFrame.size.height - navigationBarHeight*2);
myTableView.frame = tableViewFrame;
EDIT: Ah, almost forgot. You'll also want to change the scrollIndicatorInsets to match the contentInset, so your scroll bars don't move offscreen.
myTableView.scrollIndicatorInsets = myTableView.contentInset;