I have a view at the bottom of my view controller which has the following constraints:
align centre horizontally
fixed aspect ratio (1:1)
proportional width to width of view controller
bottom space of -50
How do I make the bottom space constraint proportional to the height of the view using Auto Layout? Meaning that if the height of the view is 250, the bottom space will be -50, but if the height is 300, the bottom space will be -60, and so on (the proportion is fixed at 0.2)?
Use the multiplier value. You want the bottom of your view to be 0.8 times the bottom of the superview.
Related
I have a view and I add a subview to this with the following Autolayout requirements:
If view width is greater than or equal to view height, then i want subview width to be 75% of view width and height to be 15 points,
If view width is less than view height, then I want subview width to be fixed 15 points and subview height to be equal to 75% of view height.
How do I express these constraints programatically.
This is my setup:
I do not know what I am doing wrong. The image view is bigger than the size of the view and of the scroll view. The constrains are set al followed:
Scroll view: equal heights to View * 0,5, equal width to View, center Y and X to View.
View (inside Scroll view): pinned all zero's inside Scroll view, equal heights and width. I also tried instead of equal heights and widths to center X and Y inside Scroll view, but it won't scroll.
How can I let the Scroll view scroll? Thank you.
Add a leading, trailing and top constraint and equal height of UIScrollView to superview with 0.5 multiplier. Now to your contentView (the UIScrollView subview), add a leading, trailing , top and bottom constraint. Also add equal height and width to UIScrollView. Set the height to a priority of 250. Add constraints for UIImageView inside this contentView.
Since the contentView will have a fixed height of low priority equal to the UIScrollView height. This fixed height constraint will break once the UIImageView total height(based on the constraints you add) will get larger than the UIScrollView height and the content will become scrollable. So at the very least you will always have a view half the screen size and become scrollable once the content becomes too large vertically.
You need to give contentSize to scrollview.
ScrollView.contentSize = CGSize(width: 1000, height: 500)
Which constrains have you given to imageview?
set constraint of imageview:
Trailing ,leading,top,bottom - 0 and also give height constraint.
I'm having this weird issue with my constraints which causes the UILabel (Caption Label) to be a fixed height instead of dynamically changing height depending on the text.
I have a view (Vertical View) with a top constraint on the label above it. The Vertical View contains a view (called View) which I'm using as a divider that is centered from top to bottom with a width of 1. On the left of the divider is a UIImageView (Left Image View) with constraints leading, top, bottom equal to superview and trailing equal to View. I want to do the exact same thing to the UIImageView on the right of the divider but here is where my issue comes up.
If I use a fixed height as seen below, the UILabel above Vertical View dynamically changes its height like I want but this is obviously not how I want the UIImageView on the right to appear. I want it to be similar to the UIImageView on the left of the divider with equal height and width.
If I set the top constraint of the UIImageView on the right to the superview Vertical View, similar to the UIImageView on the left of the divider, the UILabel above Vertical View doesn't dynamically change height anymore. The UILabel now has a fixed height which I believe comes from the fact that UILabel has a height of >= 14.
How can I properly set the constraints so that I can have both UIImageViews next to each other with equal and height contained within the Vertical View and still have the UILabel above Vertical View dynamically change height depending on the text that I set the UILabel to?
On the RightImageView, you first need to get rid of the "Height = 50" constraint. This is what is causing it to be small.
Next, if that alone doesn't fix you, can you try setting the following constraints instead of using the superview for the constrains (instead make it mirror the LeftImageView):
Left: Leading spacing to divider view
Top: Align top edges to LeftImageView
Right: Horizontal space to superview (your vertical container view)
Bottom: Align bottom edges to LeftImageView
This should allow the views to remain the same height and width (assuming your distances between left/right edge of vertical container view are the same, and the distances between divider are the same).
Now, ensure the size constraint for width of the divider is set to 1 and not >= 1. Also, ensure the vertical container view has a Compression lower than the Label.
One final note--your screenshot shows the result that IB is showing you (with the dotted yellow box) on the LeftImageView. One you update your constraints correctly, this yellow box should go away.
Regarding the UILabel - if you want this to grow dynamically, you need to do the following:
myUILabel.numberOfLines = 0;
myUILabel.text = #"Enter large amount of text here";
[myUILabel sizeToFit];
I have this view hierarchy
I want my content to grow vertically in content view but not horizontally. so I want to constrain ContentView's width to be the same as device's width. How can I do this in Interface Builder?
Note: The image's width in Image View is bigger than device's width, so right now ContentView's size grows both vertically and horizontally
just add the constraints to content view as leading space,trailing space,top space,bottom Space along with fix content view width constraint as constant and then create the outlet for width constraint value and in view controller side write method as
-(void)viewDidLayoutSubViews
{
_scrollViewContentViewWidthConstraint.constant = self.view.frame.size.width;
}
I have a Controller with 4UILabels that are constant height throught all the iPhones, below the lastUILabel there is aUIView with a page controller(with aTableView inside that page controller).
What I want is that theUIView take all the height that he cant :
example: Screen of 600 height
4UILABELS = 200 height
TableView = it should get 400 height
Screen of 800 height
4UILABELS = 200 height
TableView = it should get 600 height
I need 1 constraint more to set the height of the view,What I have defined is :
EqualWidth constraints to superView
LeadingSpace to SuperView
Top Space to super VIew
The following constraints should align everything for you so that the UILabels stack vertically, each have height 50, and stretch to the edges. The UIView will take up the remaining space regardless of the screen size.
All UILabels
Pin leading edge to superview
Pin trailing edge to superview
Add height constraint set to 50.0
UILabel 1:
Pin top edge to superview top
UILabel 2:
Pin top edge to UILabel 1 bottom
UILabel 3:
Pin top edge to UILabel 2 bottom
UILabel 4:
Pin top edge to UILabel 3 bottom
UIView
Pin leading edge to superview
Pin trailing edge to superview
Pin top edge to UILabel 4 bottom
Pin bottom edge to superview
UITableView
Pin leading, trailing, top and bottom to its container view so it fills the area.
I assume that you are creating this UIViewController in a Storyboard.
You should be able to put all the labels in a container view which you give the constant height of 200 points, as you specified. Make a vertical constraint from "Top layout Guide" to said container view, maybe with the value 0. Drag an UITableView and place it below the container view. Dont give it any constraint regarding height. Make a vertical spacing between the (bottom of) container view and the (top of the) UITableView with value 0 and a vertical spacing between the (bottom of the) UITableView and the Bottom Layout Guide with value 0.
So it will be (V:0 means vertical spacing, constant 0):
Top Layout Guide
V:0
Container View - Height: 200
V:0
TableView (dynamic height)
V:0
Bottom Layout Guide
This should work.
(And then of course you need to create constraints regarding width and also internal constraints for each UILabel inside the container view. Let me know if you need help with that.)