My app has two views, one in the top half of the screen, one in the bottom half of the screen. The top half view is called mainView, and the bottom half is called tableView. I have a UITextField in the mainView at the bottom of the mainView. So, I am getting the difference between the tableView's height and the keyboard so I can move the mainView up/down enough so that the keyboard will be directly below the uitextfield. The code I am using below works on iphone 4s and iphone 5, but anything bigger leaves a little bit of whitespace between the textfield and the keyboard. How can I fix this?
func keyboardShown(notification: NSNotification) {
let info = notification.userInfo!
let value: AnyObject = info[UIKeyboardFrameEndUserInfoKey]!
let rawFrame = value.CGRectValue
let keyboardFrameHeight = view.convertRect(rawFrame, fromView: nil).height
let bottomSpace = tableView.bounds.height
let spaceDifference = (keyboardFrameHeight - bottomSpace)
view.layoutIfNeeded()
self.mainViewProportionalHeight.constant -= spaceDifference
animLayout(0.5)
}
To reiterate:
mainView = top half of the view
tableView = bottom half of the view
There is a UITextField attached to the bottom of the mainView, so that the bottom of the mainview = bottom of the mainView. Basically, i am trying to align the mainView right above the keyboard without any whitespace in between.
The easiest way I've found to solve your problem is with the CocoaPod, IQKeyboardManager.
You just have to add it to your podfile and then run pod install and it takes care of positioning your keyboard right below whatever text field your writing in. (Even ones that the keyboard would normally cover)
Here's a link to it: https://cocoapods.org/?q=iqkeyboardmanager
Related
In UIScrollView, there is a feature named "Keyboard Dismiss interactively"
By using such option, this enables me to implement the following drag down to hide keyboard
However, the keyboard dismiss operation only kick start, when the UIScrollView drag action touches keyboard edge.
What I would like to achieve is, the keyboard dismiss operation kick start, when the UIScrollView drag operation touches the bottom toolbar edge.
What I wish to achieve (Same as WhatsApp)
As you can see from the video, the keyboard dismiss operation will kick start, when the drag operation touches the bottom bar edge, even before touching keyboard edge.
May I know, what technique WhatsApp is using, to achieve such behavior?
Side note
You may notice our bottom toolbar does move along with keyboard. This is because there is a bottom constraint for bottom toolbar's bottom with Safe Area's bottom.
We adjust the bottom constraint's constant value, by installing a gesture recognizer in global Window. This is the code snippet to achieve such technique.
#objc private func didPan(_ sender: UIPanGestureRecognizer){
if keyboardHeight > 0 {
let mainScrollView = editable.mainScrollView
let isScrolling = (mainScrollView.isDragging || mainScrollView.isDecelerating)
if isScrolling {
if let mainScrollViewGlobalOrigin = mainScrollView.globalOrigin {
let point = sender.location(in: sender.view!)
// Take safe area into consideration, like iPhone 12 Pro Max.
let key = UIWindow.key
let bottomSafeArea = key?.safeAreaInsets.bottom ?? 0
let dy = point.y - (
mainScrollViewGlobalOrigin.y +
mainScrollView.frame.height +
toolbarHeightLayoutConstraint.constant +
bottomSafeArea -
bottomLayoutConstraint.constant -
self.keyboardHeight
)
if dy > 0 {
bottomLayoutConstraint.constant = -(keyboardHeight - dy)
}
}
}
}
}
The reason that WhatsApp behaves like this is that their view is considered to be part of the keyboard, so when the swipe gesture reaches their custom view it will begin interactive dismissal.
To achieve this yourself all you need to do is provide the toolbar view as the inputAccessoryView for your view controller. You won't need the constraints for positioning as the keyboard window would then control your toolbar's position.
There is also inputAccessoryViewController for the times where your toolbar may not be a UIView, but instead an entire UIViewController.
The views in either of these properties will only be visible when the keyboard is visible, so to get around that you'll still want to put it into your view hierarchy, but remove/add it based on becoming/resigning first responder.
EDIT: Also, you should be using UIApplication.keyboardDidChangeFrameNotification to detect when the keyboard changes size/position/etc and allow you to adjust insets/positions of views appropriately. In modern iOS there are plenty of ways the keyboard can change size while open, and observing that notification is the correct way to handle the keyboard size.
What I want to to: I want to drag down the whole view of a viewController to dismiss to the parent viewController using a pan gesture recognizer.
The Problem: When I drag the view down, the navigationBar decreases its height and does not look good. When the view returns to its original position, the navigationBar returns to the default size. I want the navigationBar to stay at its size. I also tried to use the new large titles and some other properties of the navigationController/-bar, but that did not solve it.
Note: Everything worked fine already before iOS 11.
My code:
override func viewDidLoad() {
super.viewDidLoad()
let panGesture = UIPanGestureRecognizer(target: self, action: #selector(dragViewDown(_:)))
navigationController!.view.addGestureRecognizer(panGesture)
}
#IBAction func dragViewDown(_ gesture: UIPanGestureRecognizer) {
if let dragView = gesture.view {
let translation = gesture.translation(in: dragView)
dragView.center.y = (dragView.center.y + translation.y)
gesture.setTranslation(CGPoint.zero, in: dragView)
}
}
This test project only has one viewController and does not provide the dismissal, but the problem is the same as in my working project.
I also uploaded the project to GitHub: https://github.com/maddinK7/navitationBar-pull-down-problem
Does anyone have an idea how to solve this? Thanks in advance.
I want the navigationBar to stay at its size
It is staying at its size. If you check the navigation bar's bounds size height before, during, and after the drag, you will see that it remains the same (probably 44) at all times. What's changing is the drawing extension that causes the drawing of the nav bar to extend up behind the status bar. It can't do that when you pull the whole thing away from the top of the screen, because it is not at the top next to the status bar any more. iOS 11 is more strict about the way it performs this drawing extension, probably because it has to do it in a special way on the iPhone X.
So, let's make sure you're doing this correctly:
Make sure that the navigation bar has a top constraint pinned to the safe area layout guide's top, with a constant of zero.
Make sure that the navigation bar has a delegate that returns .topAttached from position(forBar:).
If you are doing both those things and it doesn't help, you'll have to implement this in some other way entirely. Making the view directly draggable like this, without a custom parent view controller, was always dubious.
When UINavigationController attached top, system will add safe area top margin in the navigation background.
(NOTICE: Background margin will not changed when offset value is between 1 and 0)
So you have to handle attached/detached top event by handle gesture offset to change the right offset and content insets.
You can try the solution in my lib example. ;)
My example include UITableViewController in the UINavigationController, so it will relatively complex.
https://github.com/showang/OverlayModalViewController
I have a UIViewController with a separated UIView inside it. This view has some textfields. If the user taps on one of the fields, the view will automatically fit his center.y. In the end the textfield which the user tapped will be in the middle of the screen. But in my case the view doesn't move. In the simulator it worked great, but on a real phone nothing happens. Only the output center.y position changes. I fixed the UIView with constraints.
Here is the code for the tap action.
func textFieldDidBeginEditing(_ textField: UITextField) {
textField.layer.borderWidth = 0
textField.clearsOnBeginEditing = true
textField.text = ""
print("Began")
let textFieldCoInView = textField.center
let coInSelf = self.dataView.convert(textFieldCoInView, to: self.view)
print(coInSelf)
print(self.view.center.y)
if(coInSelf.y > self.view.center.y) {
dataViewOriginY = dataView.center.y
print("Works")
self.dataView.center.y = self.dataView.center.y - (coInSelf.y - self.view.center.y)
print(self.dataView.center.y)
}
}
"I fixed the UIView with constraints."
If the view you're trying to move has constraints on it, autolayout is probably fighting you. to test that theory try turning off constraints for the view you're moving.
If that's it, you'll probably need to do something like make outlets to the constraints and change the values in your code (or not use constraints).
In any case, I think you'll find that autolayout is fighting you and keeping the view where its constraints say it belongs.
Please check the constraint you have set for the UIView . and also check the console for errors. Constraints can stop the code to change view. Maybe turn off the constraint and check if the code works.
I'm having a TopContainer View then a Scrollview and then again a BottomContainer view.
Now The constraints are that the scrollviews top is to the bottom of topContainer and that the bottom of the scrollview is to the top off the bottomcontainer.
When I start the viewcontroller and see the view hierarchy it is good.
But then when the keyboard shows I want to modify the autolayout constraint so that the bottomcontainer moves up.
So I thought I save the constraint and the change the constant like this:
private var toolbarBottomConstraint: NSLayoutConstraint?
self.toolbarBottomConstraint = self.toolbar.autoPinEdgeToSuperviewEdge(.Bottom, withInset: 0)
And then when the keyboard popups up I do this:
func keyboardWillShow(notification:NSNotification){
var userInfo = notification.userInfo!
var keyboardFrame:CGRect = (userInfo[UIKeyboardFrameBeginUserInfoKey] as! NSValue).CGRectValue()
keyboardFrame = self.view.convertRect(keyboardFrame, fromView: nil)
self.toolbarBottomConstraint?.constant = keyboardFrame.size.height
}
This doesn't do anything. The keyboard height is exactly the offset the bottom needs to be on top of the keyboard.
Why is the view not changing? I always change constants like that and it always works. Do I need to do something special because it's now with the keyboard.
If you're building for iOS 9 or above, I wrote a simple library that takes care of automatically adjusting views when a keyboard appears. It's pretty flexible and it should work seamlessly.
If you do still want to roll this on your own, it looks like you haven't added a listener for the notification anywhere. You'll need to do that before messages are sent to the keyboardWillShow(_:) method.
Have you tried calling setNeedsLayout() after the set of the constraint?:
self.toolbarBottomConstraint?.constant = keyboardFrame.size.height
self.view.setNeedsLayout()
How can I check if the keyboard is blocking my view?
I have UIButton that is in the centre of the screen. I also have a UITextfield that makes the keyboard appears. When I run the app on iPhone 4 the keyboard block the button, but on other models, it doesn't. I have a method that scrolls up the view when the keyboard appears. But I only want to scroll up in case the view is blocked. I can check the model of the iPhone and then decide if to scroll or not, but I thought checking if the Button is blocked would be better. How can I do it?
I solved this problem in an app like so:
Embed the UI for that screen in a UIScrollView, but configure it so that scrolling is not enabled (scrollEnabled property from code, checkbox if you're using a storyboard).
When the keyboard notification is received, get the frame from the button, then call scrollRectToVisible:animated: on the scroll view. It'll move the content the minimum amount necessary to make the button visible, which will be not at all if the screen is big enough.
Using the UIKeyboardWillShowNotification, you can get the height of the keyboard like this:
NSValue *keyboardRect = [notification.userInfo objectForKey:UIKeyboardFrameBeginUserInfoKey];
CGFloat keyboardHeight = MIN(keyboardRect.CGRectValue.size.width, keyboardRect.CGRectValue.size.height);
The get the relevant "lowest" point of your button. (like buttonMaxY = CGRectGetMaxY(yourButton.frame)).
Use the scroll methods you have implemented, but scroll only if necessary: keyboardHeight+buttonMaxY > the height of the screen.
When keyboard is about to appear, a UIKeyboardWillShowNotification notification is posted with the frame of the keyboard. You can calculate and see if the text field frame intersects with the keyboard frame, and scroll.
See documentation on keyboard notifications here.
Following Leo Natan's explanation, you can try something like:
func keyboardWillShow(notification: Notification) {
guard let keyboardFrame = notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? CGRect,
let viewFrame = myView.frame else {
log.error("I cannot calculate keyboard & view frame")
return
}
if keyboardFrame.intersects(viewFrame) {
// view covered by Keyboard
}
}
pay attention to use UIKeyboardFrameEndUserInfoKey, you can check this link for further details.