I need a button to set up via autolayout which height will increase if the horizontal space is not enough i.e. after rotation. I have a leading and trailing constraint to the parent view, and in portrait mode there is lack of space, so I was thinking about not to reduce font size, but increase height and set Word Wrap for Line Break. I was experimenting size classes, but in somehow always the wCompact hAny is used, because I am testing in iPhone. So to set different height for button for different size classes had no effect.
Anybody has idea how to set depending button height on the available button width and the content via autolayout constraint?
On iPhone button below needs two lines, not 30px, but appr. 60px.
Why are you using a button? This is not what a button is for. If you have that amount of text to display then use either a UILabel or UITextView. You can then add a gesture recogniser to it to capture the tap.
You can use UILabel and can use UITapGestureRecognizer on it. and set number of lines=0 in nib file and have one action of tap gesture. it will work like a button with almost no code as u want
Because I am suspicious it is not possible with Interface Builder I made it with subclassing an UIButton:
class DynamicHeightButton: UIButton {
override func layoutSubviews() {
super.layoutSubviews()
let size = (self.titleForState(UIControlState.Normal)! as NSString).boundingRectWithSize(CGSizeMake(self.bounds.size.width, CGFloat.max), options: NSStringDrawingOptions.UsesLineFragmentOrigin, attributes: [NSFontAttributeName : UIFont.systemFontOfSize(17)], context: nil)
self.bounds.size.height = size.height + 8
}
}
Related
I don't want to set a Y position constraint because I need the views to be relative to each other, since I have a UITextView that has to and should dynamically change its value based on how many lines of text are in it. It does not do this though. I can FORCE it to do it by calling sizeToFit() on the UITextView, but then it overlaps the views below.
Xcode nags me to reduce ambiguity and there are red lines all over the view controller, but it doesn't make any sense for me to manually have a Y position constraint if that has to be dynamic.
So my question is how do I
1. Make my UITextView resize its height after the number of lines of text increases
2. Make the views below it get pushed down automatically so the UITextView does not overlap them.
I've read multiple answers and have managed to do 1 but not the other.
Solution in Swift:
let sizeThatFitsTextView = textView.sizeThatFits(CGSizeMake(textView.frame.size.width, textView.frame.size.height))
textViewHeightConstraint.constant = sizeThatFitsTextView.height
1) Disable the scroll of Textview from storyboard or by coding.
2) Create an outlet for textview's height constraint. Change the height constraint programmatically from textView delegate method when text change occur based on calculation.
CGSize sizeThatFitsTextView = [TextView sizeThatFits:CGSizeMake(TextView.frame.size.width, MAXFLOAT)];
TextViewHeightConstraint.constant = sizeThatFitsTextView.height;
#IBAction func sizeChanged(sender: UISlider) {
let senderValue = CGFloat(sender.value)
myLabel?.font = UIFont(name: (myLabel?.font.fontName)!, size:senderValue * 20)}
I want to change myLabel.font size with a slider, but myLabel does not change adjust its width and height as the font size increases.
How do I change the UILabel size to follow its font size?
Thanks.
After updating the font size of the UILabel, you'll want to call sizeToFit().
myLabel?.sizeToFit()
According to the UIView Class Reference,
Call this method when you want to resize the current view so that it uses the most appropriate amount of space. Specific UIKit views resize themselves according to their own internal needs. In some cases, if a view does not have a superview, it may size itself to the screen bounds. Thus, if you want a given view to size itself to its parent view, you should add it to the parent view before calling this method.
myLabel?.sizeToFit() will set the size of label to fit its content...just make sure you haven't added height and width constraints for the label.
I have an UILabel, created in Universal storyboard, and I have mentioned all required constraints for its position OTHER THAN WIDTH. So it resizes itself as per the text set. Fantastic! Exactly what I want.
Problem starts here : It has background color as green color, but that color is wrapping my text tightly. I thus believe that making it a little wider can help me. But to do that, I need to know which method of my UILabel subclass is invoked. So that I can override and add additional width of 10 points.
BottomLine: Which UILabel method is invoked for resizing the label automatically after I assign it the text?
The way it currently looks :
Unfortunately, we don't have any contentEdgeInsets property we can set on a UILabel (as we do have on a UIButton). If you want auto layout to continue to make the height and width constraints itself, you could make a subclass of UILabel and override the intrinsicContentSize and sizeThatFits to achieve what you want.
So, something like:
- (CGSize) intrinsicContentSize
{
return [self addHorizontalPadding:[super intrinsicContentSize]];
}
- (CGSize)sizeThatFits:(CGSize)size
{
return [self addHorizontalPadding:[super intrinsicContentSize]];
}
- (CGSize)addHorizontalPadding:(CGSize)size
{
return CGSizeMake(size.width + (2*kSomeHorizontalPaddingValue), size.height);
}
Note that this only touches the horizontal padding, but can obviously be modified to add vertical padding as well.
Steffen's answer is the way to go if you want to do that programmatically. I usually have a generic custom label subclass in my projects that adds a (IBInspectable) contentInsets property, amongst other things.
Anyways, just wanted to point out that you can also do this completely in IB by just wrapping your label in another view, give the container view the background color and add constraints for your horizontal padding.
I am making a app without using storyboard. The app has a long text so I can't get enought space on one line. The app is for both iPad and iPhone. The adjustSizeToFit = true does not work, is there a metode to adjust size of label with multiple lines?
There is no property on UILabel called adjustSizeToFit. Are you sure you didn't mean adjustsFontSizeToFitWidth? Which if you look at the documentation, says:
Normally, the label text is drawn with the font you specify in the font property. If this property is set to true, however, and the text in the text property exceeds the label’s bounding rectangle, the receiver starts reducing the font size until the string fits or the minimum font size is reached. In iOS 6 and earlier, this property is effective only when the numberOfLines property is set to 1.
Which I'm not sure is what you wanted.
If you wanted a UILabel with an arbitrary number of lines, where the text is contained within a certain width, continue reading:
What you do will depend on whether you're using AutoLayout or not:
Not AutoLayout
Just use:
let size = label.sizeThatFits(CGSize(width: myWidth, height: CGFloat.max))
// CGFloat.max, because we don't want to limit the UILabel's height.
label.frame.size = size
AutoLayout
Firstly, you should set numberOfLines to zero.
Secondly, you need to tell AutoLayout how long each line can be, this doesn't default to the width of the label. For this you need a UILabel subclass:
class myLabel : UILabel {
override func layoutSubviews() {
// 1. Get the label to set its frame correctly:
super.layoutSubviews()
// 2. Now the frame is set we can get the correct width
// and set it to the preferredMaxLayoutWidth.
self.preferredMaxLayoutWidth = self.frame.width
}
}
I have a UIButton and it can change the title at the runtime. Therefore, I want to increase the UIButton height depend on the title text for display full text by using AutoLayout.
I can increase the UILabel height by set the height constraint to "Greater than or Equal" but it not work with UIButton.
I have used [myButton sizeToFit] but it only increase the UIButon width (not increase height).
My current UIButton properties now is
- constraint height: 30
- leading : 15
- trailing: 15
- top: 5
- fontsize: 12
UPDATE
I created an IBOutlet for constraint height of UIButton for changing the height as #NSNood said.
Then I need to use \n in title text to split line.
But I don't know where should I put the \n?
Here is the Button that I want in portrait
Here is the Button that I want in landscape
How can I determine the place to put \n?
Please guide me how to achieve it with AutoLayout. Any help would be appreciated.
Sorry that I didn't follow the post, lately and thus am coming up with a real late solution. Still I'm writing the answer as a reference, if someone might find it useful in future.
First of all let's show the storyboard configuration for the button. Those are depicted in the following pictures:
The picture shows that I have added only left, top and right constraints for the button and nothing else. This allows the button to have some intrinsicContentSize for it's height but it's width is still determined by it's left and right constraints.
The next phase is to write some ViewController class that shall contain the button. In my VC, I have created an outlet for the button by name button:
#property(nonatomic,weak) IBOutlet UIButton* button;
and has attached it to the storyboard button. Now I have overridden two methods, namely, viewDidLoad and viewWillLayoutSubviews like below:
-(void)viewDidLoad {
[super viewDidLoad];
self.button.titleLabel.numberOfLines = 0;
self.button.titleLabel.lineBreakMode = NSLineBreakByWordWrapping;
}
-(void)viewWillLayoutSubviews {
[super viewWillLayoutSubviews];
[self.button setTitle:#"Chapter One\n "
"A Stop on the Salt Route\n "
"1000 B.C.\n "
"As they rounded a bend in the path that ran beside the river, Lara recognized the silhouette of a fig tree atop a nearby hill. The weather was hot and the days were long. The fig tree was in full leaf, but not yet bearing fruit." forState:UIControlStateNormal];
}
The viewDidLoad method ensures the titleLabel (the label that
holds button text) is multiline and if some large text comes to it,
it wraps the text by wrapping words.
The viewWillLayoutSubviews method ensures button layouting process
occurs whenever bounds of the main view change, e.g. due to the
change of interface orientation.
The final and the most effective part is to manually handle the layout process for the button. For this purpose, we need to subclass UIButton. I have written a subclass named MyButton that inherits from UIButton and you might use whatever name you like. Set this as the custom class for the button in Identity Inspector.
The subclass overrides two methods, namely, intrinsicContentSize and layoutSubviews. The class body looks something like the following:
#import "MyButton.h"
#implementation MyButton
-(CGSize)intrinsicContentSize {
return [self.titleLabel sizeThatFits:CGSizeMake(self.titleLabel.preferredMaxLayoutWidth, CGFLOAT_MAX)];;
}
-(void)layoutSubviews {
self.titleLabel.preferredMaxLayoutWidth = self.frame.size.width;
[super layoutSubviews];
}
#end
The UIButon subclass takes the ownership of the layout process by overriding layoutSubviews method. The basic idea here is to determine the button width, once it has been layout. Then setting the width as preferredMaxLayoutWidth (the maximum width for layouting engine, that a multiline label should occupy) of it's child titleLabel (the label that holds button text). Finally, returning an intrinsicContentSize for the button based on it's titleLabel's size, so that the button fully wraps it's titleLabel.
The overridden layoutSubviews is called when the button is already
layed out and it's frame size is determined. At it's first step,
button's rendered width is set as preferredMaxLayoutWidth of the
button's titleLabel.
The second step re-invokes the layouting engine by calling [super
layoutSubviews], so that the buttons intrinsicContentSize is
re-determined based on it's titleLabel's
preferredMaxLayoutWidth, which is set to buttons rendered width,
by now.
In the overridden intrinsicContentSize method we return the
minimum fitting size for the button that fully wraps it's
titleLabel with preferredMaxLayoutWidth set. We use
sizeThatFits fits method on the button's titleLabel and that
simply works as titleLabel doesn't follow any constraint based
layout.
The outcome should be something similar to that you might have required.
Feel free to let me know about any other clarification/concern.
Thanks.
Ayan Sengupta solution in Swift, with support for contentEdgeInsets (thanks Claus Jørgensen):
(You may also further customize the code to take titleEdgeInsets into account if needed)
Subclass your UIButton to take the ownership of the layout process:
/// https://stackoverflow.com/a/50575588/1033581
class AutoLayoutButton: UIButton {
override var intrinsicContentSize: CGSize {
var size = titleLabel!.sizeThatFits(CGSize(width: titleLabel!.preferredMaxLayoutWidth - contentEdgeInsets.left - contentEdgeInsets.right, height: .greatestFiniteMagnitude))
size.height += contentEdgeInsets.left + contentEdgeInsets.right
return size
}
override func layoutSubviews() {
titleLabel?.preferredMaxLayoutWidth = frame.size.width
super.layoutSubviews()
}
}
Use this class in your storyboard, and set constraints for Leading, Trailing, Top, Bottom. But don't set any Height constraint.
An alternative without subclassing is to add a wrapper view as suggested by Bartłomiej Semańczyk answer and Timur Bernikowich comment.
The point is that if you set sizeToFit property, then the text will always be in one line and the width of the button will increase unless you put a next-line sign \n to explicitly say that you want it to be several lines.
You put '\n' in the end of the first line like "line \n line" which represents
line
line
If you want to have two different string values (with \n positioned differently) for Portrait and Landscape you can check the orientation condition using UIDeviceOrientation (UIDevice.currentDevice.orientation) described here and set a string value depending on the orientation of the device
There is a way I always used:
Add another reference UILabel which lineNumber=0 and the same width with the target button.
Do not set height constraint for the ref-UILable, and should set a height constraint for the button to adjust its height
Set the same text to the ref UILabel with the button.titleLable, sizeTofit it and get its frame.size.height
Use the height value to the height constraint of the target button. (Of course, the button.titleLabel linenumber should be set to 0 or more lines)
Done. :)
PS1. This way can be used for the button and ref-label in a scrollview.
PS2. In some case, we can not get the correct height of the ref-label because it cannot gain a correct frame.width in scrollview, especially when we use the trailling constraint. We could consider to define a fixed width to the ref-label before sizeTofit and obtain the correct height for target button use.