I have three buttons within a horizontal stack view and I have set the autolayout up so they appear based on certain criteria.
For example, first button will be 40% of the stack view width, second button has the same width as the first button, and third button takes the remaining width. Height of the buttons are the same as the stack view. They are all spaced equally, 8 points apart. Stack view's distribution is set to to "equal spacing" and alignment is set to "center".
The issue appears when I decide to hide the first two buttons, but still would like the third button to appear in the same spot with the same width. Autolayout would resize the third button as if the first button and second button are not there.
How do I make it so the autolayout created continues to be preserved as if the hidden buttons are still there?
Couldn't you just set the alpha to 0 and userInteractionEnabled to NO for the buttons you want to "hide"? This would cause them to disappear, and I don't think that it will cause the third button to expand.
Use a second constraint to the container that can act as a backup constraint. Or just re-recreate the desired constraint via code.
I have one more better solution. Add the three UIView in stack align as per your need, then add the button in every UIView. Now you can play with button hidden true/false, here UIView will always be with clear color. Alignment won't change.
Related
everybody some I'm having some trouble vertically centering the or label between the Sign in with apple button and also the login button. Keep in mind that I am creating the SIWA button programmatically and setting the constraints that way also. I have tried getting the origin y coordinate for both buttons, dividing them by 2 and then setting the vertical constraint from the login button to the or label to be (loginButton.frame.origin.y - (divided by 2 value)) but that doesn't seem to work. Thanks for your help.
There's a couple ways to solve this:
Put the 2 buttons and the label in a vertical UIStackview with distribution set to equal spacing. Stackviews are very flexible too, especially in more complex layouts.
Create an empty UIView that sits between the two buttons, then add the label as a subview and center it. Alternatively, you can create 2 spacer views with equal height constraints above and below the label:
V:|[Button][space][Label][spacer2(==spacer1)][Button2]|
Very easy approach: by default, UILabel centers its text vertically in its frame.
So,
constrain the Top of the Label to the Bottom of the top button
constrain the Bottom of the Label to the Top of the bottom button
All done :)
I have a ViewController that contains a Stack View. In this Stack View there are 3 more Stack Views. The first contains 3 labels, the second contains more Stack Views with buttons and labels, and the third contains 2 buttons and a label. And at the bottom, there is a button. The layout is fine on screen sizes from 4,7" and bigger. But when the screen size is smaller, it cuts out the top Stack View. I have tried to set constraints on leading, trailing, top and bottom in different variations (with and without top and bottom constraints) But I can't make it work properly. I have attached screenshots of the different screen types.
EDIT* Depending on the selection from the previous ViewController, the middle Stack View(the one with the check boxes) can be isHidden When its hidden, the view is correct.
Generally you don't set height on UIStackView. They are dependent on it's content. This will cause your stackview to get out of the screen height. Have you used the view hierarchy? If you want to cover the small sized phones you could put your main stackView inside a scrollView to still be able to see all content.
It's a bit difficult to diagnose what's happening without seeing the constraints you apply to the views, however I'll recommend you some things that may help:
Set the space between views using size classes so you can set the right one depending on the screen size and avoid the overlap with the below views.
In case you are doing it, don't set a height constraint for any stackView.
To align the top StackView I would use not only a top constraint to the top bar (of type greater than or equal) but also a vertical center constraint with a right multiplier (with a high priority). In this way you ensure the top stack view is aligned vertically in proportion to the screen size and with the top constraint you ensure the stackView doesn't hide below the top bar.
Make sure you are hiding the right stackView.
I'd like to have an interactive animation where a view transitions from one set of constraints to another as the user drags up/down the screen. The background image should shrink vertically (easy), and the profile image should change from being horizontally and vertically aligned to the background image to being anchored to the top and left corners of the background image. Is this possible?
Yes, it is possible, and you can see this effect in the Avvo app, for example (in the lawyer profile screen). The trick here is to smoothly transition from one set of constraints to another.
Here's an outline of how to do this:
add a UIScrollView. Add the view you want to animate as a subview to the scroll view.
Make your view controller implement
UIScrollViewDelegate
In the delegate method
scrollViewDidScroll(_:), update the constraints' constants as
needed.
Also in that method, when contentOffset crosses a
threshold value, flip to a different set of constraints, by setting
their active property to true or false.
To keep the view (the headshot image, in my example), pinned to the top as you scroll, just continuously update its top spacing constraints based on the contentOffset.y value.
Achieving a perfectly smooth transition may take some trial and error, but it definitely can be done!
Here are the screenshots showing the transition as you scroll up:
I need some help figuring this out.
I have a simple UI I need to implement. I have 4 buttons that take up the entire screen and with the scrollview, I want the user to be able to scroll to make the 5th button visible. I know how to use auto layout to make my first four buttons display how I want them. The first button is 40% of the visible screen, the second button is 15%, the third 30% and the last button is 15% of the visible screen. The 5th button should be hidden but then revealed when the user scrolls down.
(To clarify, all buttons have width equal to their superview, proportional height to the superview and all buttons have no spacing between each other)
This is where I am stuck. I want the proportions as I stated above, but also want the 5th button to show when scrolled to, possibly at 10% of the now visible screen (with the first button now not showing itself fully). Is there a way to do this?
You can set the contentSize of the UIScrollView to be larger than the visible screen. The buttons can be sized and placed in a way to have all 5 buttons visible (with the 5th button actually off screen). The scrollView will bring the 5th button into view when scrolling.
I worked up a simple prototype using just a storyboard (and setting the contentSize of the scrollview in Runtime Attributes section, but this could be done in code if you need to pragmatically determine the button sizes.
For example, on a UIView, from left to right there are three buttons:,button1,button2,button3.
When button 1 become wider, such as its width become twice as its original width, is there any interface builder way that can make button2&3 move right automatically?
sorry for I didn't make my question clear.
I mean such kind of size change: I push button1, then I change it's frame in my code, not caused by the change of text in butotn1. I want button2&3 to move right automatically, keeping the width of the gap between button 1 and 2 unchanged.
Thanks everyone.
IB can be used only for initional positioning of views.
True, you can also define autoresizing masks of the views but that's about it.
Any additional laying out should be done in code.
I could be wrong, but I don't know of any way you can do this in IB. It's pretty straight forward in code though, just link the buttons to some IBOutlets and check the sizes of the images of the buttons (myUIImage.size), then adjust the frames of the buttons (do it in viewWillAppear).
Seen your edit - if you're adjusting its size using code, adjust its position too.
If your buttons are in a row at the bottom of the screen, consider using a UIToolBar. Its UIBarButtonItem objects automatically adjust to fit each other's width changes. For more generic cases, you'll need to recalculate positions and sizes as in Franklyn Weber's answer.
Yes - by using autoresizing masks. If you allow the margins to be flexible (no red lines connecting the frame to the superview's frame) and allow flexible width and height, the buttons will size and move proportionally.