I am making an app where I need text to display directly above a UIImage. When the text is too wide to fit, I need it to display on 2 rows of text, with the bottom one being at the same position vertically as if it only had one row. If the text cannot fit in two rows, I want it to get smaller so that it will just fit in the two rows. Below is an image showing what I mean.
Image
Label constraints : top to superview , leading & trailing & bottom to imageView ,,, with .lines = 2 , textAlignment = .center
ImageView constraints : centerX , width , height
Related
My task is to preserve the size and position of the elements inside my cell for different screen resolutions.
I did:
Established constraints for the red and green blocks (UILabels) to
the outer container.
Set the constraint between them equal to 0. It is more priority than the limitation of the red block to the bottom and green to the top.
Set Lines = 0 for these labels.
Set Autoshrink.
As a result, the font size changes on different devices. But there are still a few problems:
How can I remove too large paddings above and below both labels?
How to make them resize evenly?
Now one of the blocks has an advantage over the other, depending on what constraint to make a higher priority. If you make them equal - it also does not work.
(I would like to do everything through Interface Builder)
Screenshot with differing priorities of constraints
My constraints
Paddings and Attributes
You can take advantage of equal height and equal width constraints.
Follow the below steps to make the UILabel spacing same on iPhone 8 and iPhone 4s. This will help you to make it proportional.
1) To achieve this simply select, your label(red), label (green) and the superview (which I think you're its a cell of UICollectionView)
2) We are interested here in keeping the height proportional.
i.e Red Label (80%) and Green Label (20%)
Currently, all heights are equal to superview height i.e height of RedLabel and Greenlabel is equal to 100% of superview.
But the goal is to make it 80% and 20% for red and green label respectively.
So select Red Label height constraint. Here you set the constraint which says's "height of the red label should be 80% of the superviews height".
Similarly for Green Label, set "height of the greeen label such that it's 20% for the superview's height".
Red Label
Green Label
3) Now complete the x and y axis position constraint, which would be straight forward
a) Red Label Leading = Leading edge of superview
b) Red Label Trailing = Trailing edge of superview
c) Red Label Top = Top edge of superview
d) Red Label Bottom = not required (as it has all the required constraint's to justify it's position i.e height = 0.8 * superview and it is top aligned, ex: super view height is 100 , keep this view top aligned with height = 80 )
e) Green Label Leading = Red Label Leading (you have already set this in point "a" no need to set the constraint again for Green label)
f) Green Label Trailing = Red Label Leading (you have already set this in point "b" no need to set the constraint again for Green label)
g) Green label bottom = bottom of superview
h) Green label top = not required (as it has all the required constraint's to justify it's position i.e height = 0.2 * superview and it is bottom aligned, ex: super view height is 100 , keep this view bottom aligned with height = 20 )
This is the final constraint list and the storyboard preview for iPhone 8 and 4s.
I have a custom table cell. It has two labels (title and description), one below the other.
What I have right now is, title label top = topMargin. And description label top = title label bottom + 10.
But in some cases, there will be no description. In such cases, I want the title label to be centered vertically inside the cell. Is this possible? What constraints do I have to set?
A UIStackView makes it easy to do what you want.
Create a prototype cell
add two labels
embed them in a stack view
set the stack view's properties to:
Axis: Vertical
Alignment: Fill
Distribution: Fill Equally
Spacing: 10
constrain the stack view Top/Leading/Trailing/Bottom to 0 to the cell's content view's default margins (or set your own "padding")
set your fixed row height - with default labels + 10-point spacing + top and bottom margins, you'll probably want at least 67
connect the labels to IBOutlets
When you set the text of the labels in cellForRowAt indexPath:, set the description label's .isHidden property to true if it has a description, or to false if it doesn't.
The result (with background colors for clarity):
The result without background colors:
I have 2 labels: the description label (w/ red background) and the results label (gray text)
How do i set constraints for this example in order to have the results label with the size of its content and the description label until the results leadingAnchor? (like i have in the second row)
Objective C
[self.customTextLabel.trailingAnchor constraintLessThanOrEqualToAnchor:self.counterLabel.leadingAnchor].active = YES;
[self.counterLabel.widthAnchor constraintGreaterThanOrEqualToConstant:0].active = YES;
swift
titleLabel.trailingAnchor.constraint(lessThanOrEqualTo: counterLabel.leadingAnchor).isActive = true
counterLabel.widthAnchor.constraint(greaterThanOrEqualToConstant: 0).isActive = true
I have a solution that i think it's ugly.
self.counterLabelWidthConstraint = [self.counterLabel.widthAnchor constraintEqualToConstant:0];
self.counterLabelWidthConstraint.active = YES;
And then after i set the text:
self.counterLabelWidthConstraint.constant = [self.counterLabel sizeThatFits:CGSizeMake(CGFLOAT_MAX, self.counterLabel.height)].width;
The way to do this with auto layout is by using the contentCompressionResistancePriority of the 2 labels. Set the pririty to NSLayoutPriorityRequired for the second label and something lower like NSLayoutPriorityDefaultLow for the first label. Then, as long as the 2 labels have proper constraints anchoring them to their superview and each other, the first label should compress while the second label should not.
You just need to increase the horizontal compression resistance of the right/gray label to be higher than that of the left/red label. This tells the visual layout that, in the event that there is not enough space for both labels, the one on the left will be compressed before shrinking the label on the right. 750 is the default for all views, so just increase the right/gray label's horizontal compression resistance to 751 and you should be good to go.
Swift 5 programatically:
<#label#>.setContentCompressionResistancePriority(.required, for: .horizontal)
Labels with this property will not compress horizontally.
You can set constraints for in storyboard itself. Select Label 1 (red back ground) and label's superview set widths are equal constraint. Select Label 1 and double tap on its width constraint, from the resultant window, you could see Lable 1 width equal to superview with value constant as '1'. change '1' to 0.7 or whichever the percentage you want.
As I am new to iOS. So forgive me if it is duplicate or very basic question.
I am taking one View. Approx below is the size .
x : 5 y : 5
Width : 590 Height : 100
and I set constraint it
Top to superView 5
Trailing to superView 5
Leading to superView 5
Now I have one Label which have dynamic Text and the Text is too large.
And the Label Constraint is below
Top to superView 5
Trailing to superView 5
Leading to superView 5
and when i set the background color of the View the color is not set. If the Text is to Long. So how to set the Height of the View and also set background so that it looks clear.
Code :
public override void ViewDidLoad()
{
base.ViewDidLoad();
lbl_one.Text = "This is a long label which have long text inside the writing. This is a long label which have long text inside the writing. This is a long label which have long text inside the writing. This is a long label which have long text inside the writing";
lbl_one.LineBreakMode = UILineBreakMode.WordWrap;
lbl_one.Lines = 0;
view_main.BackgroundColor = UIColor.Red;
}
If I give fix Height then it look like this .
Output :
1. Give the below constraints to your view, height is according to your need. here I'm giving 80.
2. Change the height relationship.
3. Add aUILabel in your above UIview, and give below constraints.
--> leading, top, bottom, trailing to uiview and height i.e. 80.
4. set height relationship as you do with UIView.
5. Change the property of UILabel , Lines to zero
6. Now enjoy with your constraints.
EDIT: Add bottom constraint to your view instead of height constraint.
I don't see and bottom constraint added to UIView, so the view height will be 0.
If you have added the height constraint to UIView, there is a probability that UILablel might be overlapping the UIView, so you are not able to see the background color.
Set the UIView height constraint this will solve your problem
You can also add height or bottom constraint to your UIView.
I want to implement autolayout to set six square images that are always be in square even if screen size is changed.
I have tried too many variations but fail to do so.
In attached image i share sample view that autolayout will be applied.
You don't need any view wrappers or other funny business here, you can do it purely within IB or AL constraints between each item. The 'trick' is to think about the relationships between each item and to use both constants and multipliers.
Each square here is 1:1 ratio.
The orange square is 2:1 with to the first yellow square, plus 8 for the padding.
The orange square is pinned to the left, the first yellow square is pinned to the right.
All the other yellow squares are relative width to the first one.
Here's the storyboard file too:
https://www.dropbox.com/s/pk8iwj1beamkxtp/SO_Solution-20151215_2.storyboard?dl=0
Based on a comment, I added one wrapper view to make it easy to apply size classes if you want the entire thing to always be visible. (also makes it easier to drop into another storyboard).
Okay, i'll give you an easy way to achieve this, but this is my implementation, and i'm pretty sure there are a lot of implementations easier.
First, create a empty subview, and add the constraints so the view will always be a square in the top left corner:
Trailing Space to superview >= 0
Trailing Space to superview = 0 #750
Top Space to superview = 0
Left Space to superview = 0
Bottom Space to superview = 0 #750
Bottom Space to superview >= 0
Aspect ratio : 1
Now add in this square the square in the top left corner and the topRightView :
// TopLeftView constraints :
Leading Space to superview = 20
Top Space to superview = 20
Aspect ratio : 1
// TopRightView constraints :
Trailing Space to superview = 20
// Contraints between TopRightView and TopLeftView
Align bottom
Align top
Equal Width
Horizontal spacing = 20
You can now set the ratio between the squares, by setting the multiplier value of the "equal width" constraint. Let's use a 1/3 multiplier.
Let's add the bottomLeftView now. In order to not over constraining our view, we don't need to set a multiplier between the square height and this view height. We know the space on the right of the green square is equal to the space below it, so let's use only spacing and alignement constraints.
// BottomRight constraints:
Bottom Space to superview = 20
// Contraints between BottomLeftView and TopLeftView
Align left
Align right
Vertical spacing = 20
The last view to add is the BottomRightView, and alignment constraints will works well :
// Contraints between BottomRightView and BottomLeftView
Align top
Align bottom
// Contraints between BottomRightView and TopRightView
Align left
Align right
Here we are. Now you just need to add squared subviews in top and bottom of TopRightView, and at left and right of BottomLeftView. You can also change the ratio with a single variable, which would not be possible if you had set a ratio constraint between TopLeftView and BottomLeftView.