I have a UITextView and I would like to constrain it the same way as I would a UILabel. But if I use the same constrains as I would with a UILabel I am getting a different result. I also do not really quite understand how UITextView.frame works because it doesn't really matter what I set height/width, the result stays the same.
In the picture below "LinkTest" is my UITextView. As you can see it is not lined up with the UILabels below even though I constrain it the same way.
UITextView:
let linkLabel: UITextView = {
let v = UITextView()
v.backgroundColor = .clear
v.text = "Link"
v.textColor = .lightGray
v.font = UIFont(name: "AvenirNext-Regular", size: 18)
v.textAlignment = .right
v.isSelectable = false
v.isScrollEnabled = false
v.frame = CGRect(x: 0, y: 0, width: 20, height: 20)
// v.attributedText = NSAttributedString(string: "", attributes: [.underlineStyle: NSUnderlineStyle.single.rawValue])
v.translatesAutoresizingMaskIntoConstraints = false
return v
}()
Constrains:
// constrain linkLabel
linkLabel.topAnchor.constraint(equalTo: linkImage.topAnchor).isActive = true
linkLabel.leadingAnchor.constraint(equalTo: linkImage.leadingAnchor, constant: 30).isActive = true
linkLabel.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -20).isActive = true
// constrain priceLabel
priceLabel.topAnchor.constraint(equalTo: linkLabel.topAnchor, constant: 35).isActive = true
priceLabel.leadingAnchor.constraint(equalTo: linkImage.leadingAnchor, constant: 30).isActive = true
priceLabel.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -20).isActive = true
// constrain noteLabel
noteLabel.topAnchor.constraint(equalTo: priceLabel.topAnchor, constant: 35).isActive = true
noteLabel.leadingAnchor.constraint(equalTo: linkImage.leadingAnchor, constant: 30).isActive = true
noteLabel.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -20).isActive = true
I appreciate any help on this :)
Solution:
The problem was the UITextViews padding. Removing all padding solved the problem:
let padding = v.textContainer.lineFragmentPadding
v.textContainerInset = UIEdgeInsets(top: 0, left: -padding, bottom: 0, right: -padding)
When you set
v.translatesAutoresizingMaskIntoConstraints = false
then frame setting is ignored , btw you need a height
linkLabel.heightAnchor.constraint(equalToConstant: 30).isActive = true
You can set constraints using frame or using autolayout both can not work at same time. when you set v.translatesAutoresizingMaskIntoConstraints = false then frame setting doesn't affect and also you have to add height constraint
// constrain linkLabel
linkLabel.topAnchor.constraint(equalTo: linkImage.topAnchor).isActive = true
linkLabel.leadingAnchor.constraint(equalTo: linkImage.leadingAnchor, constant: 30).isActive = true
linkLabel.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -20).isActive = true
linkLabel.heightAnchor.constraint(equalToConstant: 20).isActive = true
Related
I am working on a "Profile View Controller" which is inside a TableViewCell and table cell dimension is set as UITableView.automaticDimension:
The problem is that I would like to set the background image view (Blue) with a variable height based on cell width and a 16:9 ratio. For some reason I am not being able to change the view height even if I set the constant.
Here the code:
let topView : UIView = {
let view = UIView()
view.translatesAutoresizingMaskIntoConstraints = false
view.layer.cornerRadius = 20
view.backgroundColor = .yoofitDarkBlue
view.layer.masksToBounds = true
view.layer.shadowColor = UIColor.lightGray.cgColor
view.layer.borderWidth = 0.5
view.layer.borderColor = UIColor.yoofitDarkBlue.cgColor
view.layer.shadowOffset = CGSize(width: 0.0, height: 0.0)
view.layer.shadowRadius = 12.0
view.layer.shadowOpacity = 0.7
return view
}()
let userImage : UIImageView = {
let i = UIImageView()
i.translatesAutoresizingMaskIntoConstraints = false
i.image = UIImage(named: "user2")
i.layer.masksToBounds = true
i.layer.cornerRadius = 75
i.layer.borderWidth = 1
i.layer.borderColor = UIColor.white.cgColor
return i
}()
var userNameLabel:UILabel = {
let l = UILabel()
l.translatesAutoresizingMaskIntoConstraints = false
l.font = UIFont(name: "AvenirNext-DemiBold", size: 20)
l.textAlignment = .center
l.textColor = .yoofitBlack
return l
}()
func setupViews() {
self.backgroundColor = .clear
self.selectionStyle = .none
addSubview(topView)
let width = self.frame.width
print(width) // print 320
topView.topAnchor.constraint(equalTo: topAnchor, constant: 10).isActive = true
topView.leftAnchor.constraint(equalTo: leftAnchor, constant: 8).isActive = true
topView.rightAnchor.constraint(equalTo: rightAnchor, constant: -8).isActive = true
topView.heightAnchor.constraint(equalToConstant: width/16*9).isActive = true // this doesn't work even if I set another number like 600
topView.layoutIfNeeded()
addSubview(userImage)
userImage.centerYAnchor.constraint(equalTo: topView.bottomAnchor).isActive = true
userImage.centerXAnchor.constraint(equalTo: topView.centerXAnchor).isActive = true
userImage.widthAnchor.constraint(equalToConstant: 150).isActive = true
userImage.heightAnchor.constraint(equalToConstant: 150).isActive = true
addSubview(userNameLabel)
userNameLabel.topAnchor.constraint(equalTo: userImage.bottomAnchor, constant: 10).isActive = true
userNameLabel.centerXAnchor.constraint(equalTo: userImage.centerXAnchor).isActive = true
userNameLabel.widthAnchor.constraint(equalToConstant: 200).isActive = true
userNameLabel.heightAnchor.constraint(equalToConstant: 20).isActive = true
userNameLabel.bottomAnchor.constraint(equalTo: self.bottomAnchor, constant: -20).isActive = true
}
PLEASE NOTE THERE ARE 2 answers to this question. The latter is definitely the correct one but the first maybe may help others.
So this is how I fixed it but I hope to get better answers. This answer helped me to go to the right path (iOS: How to Align The Center of a View With The Bottom of Another View With AutoLayout)
I have added a containing view which is twice as the required size of my top view (the blue one).
I centered the picture on the containing view.
self.conteiningView.backgroundColor = .red // I made this red so you can visually see how the views are related to each other
let width = self.frame.width
self.addSubview(conteiningView)
conteiningView.topAnchor.constraint(equalTo: topAnchor, constant: 8).isActive = true
conteiningView.leftAnchor.constraint(equalTo: leftAnchor, constant: 8).isActive = true
conteiningView.rightAnchor.constraint(equalTo: rightAnchor, constant: -8).isActive = true
conteiningView.heightAnchor.constraint(equalToConstant: (width/16*9)*2).isActive = true // twice of the blue view
conteiningView.layoutIfNeeded()
self.conteiningView.addSubview(topView)
topView.topAnchor.constraint(equalTo: conteiningView.topAnchor).isActive = true
topView.leftAnchor.constraint(equalTo: conteiningView.leftAnchor).isActive = true
topView.rightAnchor.constraint(equalTo: conteiningView.rightAnchor).isActive = true
topView.heightAnchor.constraint(equalToConstant: width/16*9).isActive = true // 16:9 ration
conteiningView.addSubview(userImage)
userImage.centerYAnchor.constraint(equalTo: conteiningView.centerYAnchor).isActive = true
userImage.centerXAnchor.constraint(equalTo: conteiningView.centerXAnchor).isActive = true
userImage.widthAnchor.constraint(equalToConstant: width/2).isActive = true
userImage.heightAnchor.constraint(equalToConstant: width/2).isActive = true
userImage.layer.cornerRadius = width/4 // to mantain nice proportions
conteiningView.addSubview(userNameLabel)
userNameLabel.topAnchor.constraint(equalTo: userImage.bottomAnchor, constant: 10).isActive = true
userNameLabel.centerXAnchor.constraint(equalTo: userImage.centerXAnchor).isActive = true
userNameLabel.widthAnchor.constraint(equalToConstant: 200).isActive = true
userNameLabel.heightAnchor.constraint(equalToConstant: 20).isActive = true
With red background:
With clear background:
UPDATE: The answer above works but I have actually found the problem:
Even if I had set:
self.tableView.rowHeight = UITableView.automaticDimension
self.tableView.estimatedRowHeight = 300
For some (silly me) I had also implemented:
tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat
This, of course, does not be implemented for the automatic dimension to work.
removing that allowed to use the following code to achieve the same result but without setting a predefined height:
self.addSubview(conteiningView)
conteiningView.topAnchor.constraint(equalTo: topAnchor, constant: 8).isActive = true
conteiningView.leftAnchor.constraint(equalTo: leftAnchor, constant: 8).isActive = true
conteiningView.rightAnchor.constraint(equalTo: rightAnchor, constant: -8).isActive = true
conteiningView.bottomAnchor.constraint(equalTo: bottomAnchor).isActive = true
conteiningView.layoutIfNeeded()
self.conteiningView.addSubview(topView)
topView.topAnchor.constraint(equalTo: conteiningView.topAnchor).isActive = true
topView.leftAnchor.constraint(equalTo: conteiningView.leftAnchor).isActive = true
topView.rightAnchor.constraint(equalTo: conteiningView.rightAnchor).isActive = true
topView.heightAnchor.constraint(equalToConstant: width/16*9).isActive = true
conteiningView.addSubview(userImage)
userImage.centerYAnchor.constraint(equalTo: topView.bottomAnchor).isActive = true // the vertical center is now set nicely at bottom edge of my top view.
userImage.centerXAnchor.constraint(equalTo: topView.centerXAnchor).isActive = true
userImage.widthAnchor.constraint(equalToConstant: width/2).isActive = true
userImage.heightAnchor.constraint(equalToConstant: width/2).isActive = true
userImage.layer.cornerRadius = width/4
conteiningView.addSubview(userNameLabel)
userNameLabel.topAnchor.constraint(equalTo: userImage.bottomAnchor, constant: 2).isActive = true
userNameLabel.centerXAnchor.constraint(equalTo: userImage.centerXAnchor).isActive = true
userNameLabel.widthAnchor.constraint(equalToConstant: 200).isActive = true
userNameLabel.heightAnchor.constraint(equalToConstant: 35).isActive = true
I'm currently trying to achieve a Shimmer effect in Swift. To do that I create a gray UIView, and another on top of it with an effect.
The problem is that I'm writing the same code twice...
let profileShimmerView = UIView()
profileShimmerView.backgroundColor = whiteClear
profileShimmerView.layer.cornerRadius = 20
profileShimmerView.clipsToBounds = true
let profileView = UIView()
profileView.backgroundColor = grayClear
profileView.layer.cornerRadius = 20
profileView.clipsToBounds = true
self.addSubview(profileView)
self.addSubview(profileShimmerView)
profileShimmerView.translatesAutoresizingMaskIntoConstraints = false
profileShimmerView.leftAnchor.constraint(equalTo: self.leftAnchor, constant: 45).isActive = true
profileShimmerView.topAnchor.constraint(equalTo: self.topAnchor, constant: 15).isActive = true
profileShimmerView.widthAnchor.constraint(equalToConstant: 40).isActive = true
profileShimmerView.heightAnchor.constraint(equalToConstant: 40).isActive = true
profileView.translatesAutoresizingMaskIntoConstraints = false
profileView.leftAnchor.constraint(equalTo: self.leftAnchor, constant: 45).isActive = true
profileView.topAnchor.constraint(equalTo: self.topAnchor, constant: 15).isActive = true
profileView.widthAnchor.constraint(equalToConstant: 40).isActive = true
profileView.heightAnchor.constraint(equalToConstant: 40).isActive = true
Is there a more simple way to achieve that?
You can create a function
func shared(color : UIColor)->UIView {
let v = UIView()
v.backgroundColor = color
v.layer.cornerRadius = 20
v.clipsToBounds = true
self.addSubview(v)
v.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
v.leftAnchor.constraint(equalTo: self.leftAnchor, constant: 45),
v.topAnchor.constraint(equalTo: self.topAnchor, constant: 15),
v.widthAnchor.constraint(equalToConstant: 40),
v.heightAnchor.constraint(equalToConstant: 40)
])
return v
}
I have some problems with UIScrollView. Trying to add scrollable are for some sliders but nothing is working. I think it is because I'm using anchors for layout. Please, explain to me, what I'm doing wrong. Eventually, I need to have a scrollable area for iPhone SE version that user can use sliders.
Here is my code, where I'm creating scrollview and adding all the sliders on it and putting anchors in relation with scrollview.
//MARK: Scroll View
scrollView = UIScrollView(frame: CGRect(x: 0, y: 0, width: view.bounds.width, height: 812))
scrollView.backgroundColor = .gray
scrollView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(scrollView)
scrollView.topAnchor.constraint(equalTo: collectionView.bottomAnchor, constant: 0).isActive = true
scrollView.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 0).isActive = true
scrollView.rightAnchor.constraint(equalTo: view.rightAnchor, constant: 0).isActive = true
scrollView.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: 0).isActive = true
scrollView.contentSize = CGSize(width: view.bounds.width, height: 812)
//MARK: Brightness Label
brightnessLabel = UILabel()
brightnessLabel.text = "Brightness"
brightnessLabel.font = UIFont(name: "Avenir", size: 14)
brightnessLabel.translatesAutoresizingMaskIntoConstraints = false
scrollView.addSubview(brightnessLabel)
brightnessLabel.topAnchor.constraint(equalTo: collectionView.bottomAnchor, constant: 10).isActive = true
brightnessLabel.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor, constant: view.bounds.width / -2).isActive = true
brightnessLabel.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor, constant: 10).isActive = true
brightnessLabel.heightAnchor.constraint(equalToConstant: 25).isActive = true
//MARK: Brightness Slider
brightnessSlider = UISlider()
brightnessSlider.setThumbImage(UIImage(named: "sliderThumb"), for: .normal)
brightnessSlider.tintColor = .black
brightnessSlider.minimumValue = 0
brightnessSlider.maximumValue = 100
brightnessSlider.translatesAutoresizingMaskIntoConstraints = false
brightnessSlider.setValue(50, animated: true)
scrollView.addSubview(brightnessSlider)
brightnessSlider.topAnchor.constraint(equalTo: brightnessLabel.bottomAnchor, constant: 5).isActive = true
brightnessSlider.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor, constant: -10).isActive = true
brightnessSlider.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor, constant: 10).isActive = true
brightnessSlider.heightAnchor.constraint(equalToConstant: 25).isActive = true
//MArk: Brightness Value Label
brightnessValueLabel = UILabel()
brightnessValueLabel.text = "50"
brightnessValueLabel.font = UIFont(name: "Avenir", size: 14)
brightnessValueLabel.translatesAutoresizingMaskIntoConstraints = false
scrollView.addSubview(brightnessValueLabel)
brightnessValueLabel.topAnchor.constraint(equalTo: collectionView.bottomAnchor, constant: 10).isActive = true
brightnessValueLabel.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor, constant: -10).isActive = true
brightnessValueLabel.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor, constant: view.bounds.width - 30).isActive = true
brightnessValueLabel.heightAnchor.constraint(equalToConstant: 25).isActive = true
//MARK: Contrast Label
contrastLabel = UILabel()
contrastLabel.text = "Contrast"
contrastLabel.font = UIFont(name: "Avenir", size: 14)
contrastLabel.translatesAutoresizingMaskIntoConstraints = false
scrollView.addSubview(contrastLabel)
contrastLabel.topAnchor.constraint(equalTo: brightnessSlider.bottomAnchor, constant: 10).isActive = true
contrastLabel.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor, constant: view.bounds.width / -2).isActive = true
contrastLabel.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor, constant: 10).isActive = true
contrastLabel.heightAnchor.constraint(equalToConstant: 25).isActive = true
//MARK: Contrast Slider
contrastSlider = UISlider()
contrastSlider.setThumbImage(UIImage(named: "sliderThumb"), for: .normal)
contrastSlider.tintColor = .black
contrastSlider.minimumValue = 0
contrastSlider.maximumValue = 100
contrastSlider.translatesAutoresizingMaskIntoConstraints = false
contrastSlider.setValue(50, animated: true)
scrollView.addSubview(contrastSlider)
contrastSlider.topAnchor.constraint(equalTo: contrastLabel.bottomAnchor, constant: 5).isActive = true
contrastSlider.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor, constant: -10).isActive = true
contrastSlider.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor, constant: 10).isActive = true
contrastSlider.heightAnchor.constraint(equalToConstant: 25).isActive = true
//MArk: Contrast Value Label
contrastValueLabel = UILabel()
contrastValueLabel.text = "50"
contrastValueLabel.font = UIFont(name: "Avenir", size: 14)
contrastValueLabel.translatesAutoresizingMaskIntoConstraints = false
scrollView.addSubview(contrastValueLabel)
contrastValueLabel.topAnchor.constraint(equalTo: brightnessSlider.bottomAnchor, constant: 10).isActive = true
contrastValueLabel.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor, constant: -10).isActive = true
contrastValueLabel.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor, constant: view.bounds.width - 30).isActive = true
contrastValueLabel.heightAnchor.constraint(equalToConstant: 25).isActive = true
//MARK: Saturation Label
saturationLabel = UILabel()
saturationLabel.text = "Saturation"
saturationLabel.font = UIFont(name: "Avenir", size: 14)
saturationLabel.translatesAutoresizingMaskIntoConstraints = false
scrollView.addSubview(saturationLabel)
saturationLabel.topAnchor.constraint(equalTo: contrastSlider.bottomAnchor, constant: 10).isActive = true
saturationLabel.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor, constant: view.bounds.width / -2).isActive = true
saturationLabel.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor, constant: 10).isActive = true
saturationLabel.heightAnchor.constraint(equalToConstant: 25).isActive = true
//MARK: Saturation Slider
saturationSlider = UISlider()
saturationSlider.setThumbImage(UIImage(named: "sliderThumb"), for: .normal)
saturationSlider.tintColor = .black
saturationSlider.minimumValue = 0
saturationSlider.maximumValue = 100
saturationSlider.translatesAutoresizingMaskIntoConstraints = false
saturationSlider.setValue(50, animated: true)
scrollView.addSubview(saturationSlider)
saturationSlider.topAnchor.constraint(equalTo: saturationLabel.bottomAnchor, constant: 5).isActive = true
saturationSlider.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor, constant: -10).isActive = true
saturationSlider.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor, constant: 10).isActive = true
saturationSlider.heightAnchor.constraint(equalToConstant: 25).isActive = true
//MArk: Saturation Value Label
saturationValueLabel = UILabel()
saturationValueLabel.text = "50"
saturationValueLabel.font = UIFont(name: "Avenir", size: 14)
saturationValueLabel.translatesAutoresizingMaskIntoConstraints = false
scrollView.addSubview(saturationValueLabel)
saturationValueLabel.topAnchor.constraint(equalTo: contrastSlider.bottomAnchor, constant: 10).isActive = true
saturationValueLabel.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor, constant: -10).isActive = true
saturationValueLabel.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor, constant: view.bounds.width - 30).isActive = true
saturationValueLabel.heightAnchor.constraint(equalToConstant: 25).isActive = true
//MARK: Noise Label
noiseLabel = UILabel()
noiseLabel.text = "Noise"
noiseLabel.font = UIFont(name: "Avenir", size: 14)
noiseLabel.translatesAutoresizingMaskIntoConstraints = false
scrollView.addSubview(noiseLabel)
noiseLabel.topAnchor.constraint(equalTo: saturationSlider.bottomAnchor, constant: 10).isActive = true
noiseLabel.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor, constant: view.bounds.width / -2).isActive = true
noiseLabel.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor, constant: 10).isActive = true
noiseLabel.heightAnchor.constraint(equalToConstant: 25).isActive = true
//MARK: Noise Slider
noiseSlider = UISlider()
noiseSlider.setThumbImage(UIImage(named: "sliderThumb"), for: .normal)
noiseSlider.tintColor = .black
noiseSlider.minimumValue = 0
noiseSlider.maximumValue = 100
noiseSlider.translatesAutoresizingMaskIntoConstraints = false
noiseSlider.setValue(50, animated: true)
scrollView.addSubview(noiseSlider)
noiseSlider.topAnchor.constraint(equalTo: noiseLabel.bottomAnchor, constant: 5).isActive = true
noiseSlider.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor, constant: -10).isActive = true
noiseSlider.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor, constant: 10).isActive = true
noiseSlider.heightAnchor.constraint(equalToConstant: 25).isActive = true
//MArk: Noise Value Label
noiseValueLabel = UILabel()
noiseValueLabel.text = "50"
noiseValueLabel.font = UIFont(name: "Avenir", size: 14)
noiseValueLabel.translatesAutoresizingMaskIntoConstraints = false
scrollView.addSubview(noiseValueLabel)
noiseValueLabel.topAnchor.constraint(equalTo: saturationSlider.bottomAnchor, constant: 10).isActive = true
noiseValueLabel.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor, constant: -10).isActive = true
noiseValueLabel.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor, constant: view.bounds.width - 30).isActive = true
noiseValueLabel.heightAnchor.constraint(equalToConstant: 25).isActive = true
If somebody wonders, this is my view hierarchy, where all the items I need to be on scroll view are in fact on scroll view. I added gray color to scroll view to make it visable.
When you are using autolayout you do not need to specify contentSize, it will infer that from the subviews. The conditions are:
topmostView.topAnchor should be attached to scrollView.topAnchor
bottommostView.bottomAnchor should be attached to scrollView.bottomAnchor
Leading and trailing of scrollView should be attached to any view which has a width.
A few problems i see in your code.
You seem to have attached a label's leading and trailing to a scrollView which is not what you want to do most of the time because the scrollView width will be only as much as that of the label.
You also seem to have attached the scrollView leading and trailing at multiple places which will compute different leading and trailing constraints leading to conflicts. (I'm pretty sure if you check your log it will show some constraint breaking)
You have not attached the top or bottom of the topmost and bottommost views that are inside the scrollView to the scrollView's top and bottom.
Apple recommends that when using UIScrollView, have a dummy view (contentView) which will pinned to the top, leading, trailing, bottom of the scrollView and have a specified width. The height of that view will be calculated dynamically from the views you add to it. The same concept of the top of the topmost view attached to the contentView's top and bottom of the bottommost view attached to the contentView's bottom.
You can check my github repo where there is a minimalistic example which explains a UIScrollView with autolayout.
I am added a view in viewDidAppear method using autolayout. In the end of viewDidAppear trying to find the height of view that I added , I am getting zero?
That view I am adding has a label , height of that label is dynamic
let viewToShowIn = self.view!
let bannerView = UIView()
bannerView.backgroundColor = UIColor.red
let label = UILabel()
label.translatesAutoresizingMaskIntoConstraints = false
viewToShowIn.addSubview(bannerView)
bannerView.addSubview(label)
let margins = viewToShowIn.layoutMarginsGuide
bannerView.translatesAutoresizingMaskIntoConstraints = false
bannerView.leadingAnchor.constraint(equalTo: viewToShowIn.leadingAnchor, constant: 0).isActive = true
bannerView.trailingAnchor.constraint(equalTo: viewToShowIn.trailingAnchor, constant: 0).isActive = true
let bannerTopConstraint = bannerView.topAnchor.constraint(equalTo: margins.topAnchor, constant: 0)
bannerTopConstraint.isActive = true
label.font = UIFont.systemFont(ofSize: 20)
label.text = "kjafj kfj fk fjk dakjd k fdjakljf dkfjklsdjf dfsjlkj lkfsdjlkjl sjflksdjfljslf sdfljdslkjflsdjf sldfjlksj"
label.numberOfLines = 0
label.lineBreakMode = .byWordWrapping
label.textAlignment = .center
label.leadingAnchor.constraint(equalTo: bannerView.leadingAnchor, constant: 20).isActive = true
label.trailingAnchor.constraint(equalTo: bannerView.trailingAnchor, constant: -20).isActive = true
label.topAnchor.constraint(equalTo: bannerView.topAnchor, constant: 10).isActive = true
bannerView.bottomAnchor.constraint(equalTo: label.bottomAnchor, constant: 10).isActive = true
Declare your label and view as global variable like
var viewToShowIn = UIView()
let bannerView = UIView()
let label = UILabel()
Then set constraints in viewDidAppear or viewDidLoad
viewToShowIn = self.view!
bannerView.backgroundColor = UIColor.red
label.translatesAutoresizingMaskIntoConstraints = false
viewToShowIn.addSubview(bannerView)
bannerView.addSubview(label)
let margins = viewToShowIn.layoutMarginsGuide
bannerView.translatesAutoresizingMaskIntoConstraints = false
bannerView.leadingAnchor.constraint(equalTo: viewToShowIn.leadingAnchor, constant: 0).isActive = true
bannerView.trailingAnchor.constraint(equalTo: viewToShowIn.trailingAnchor, constant: 0).isActive = true
let bannerTopConstraint = bannerView.topAnchor.constraint(equalTo: margins.topAnchor, constant: 0)
bannerTopConstraint.isActive = true
label.font = UIFont.systemFont(ofSize: 20)
label.text = "kjafj kfj fk fjk dakjd k fdjakljf dkfjklsdjf dfsjlkj lkfsdjlkjl sjflksdjfljslf sdfljdslkjflsdjf sldfjlksj"
label.numberOfLines = 0
label.lineBreakMode = .byWordWrapping
label.textAlignment = .center
label.leadingAnchor.constraint(equalTo: bannerView.leadingAnchor, constant: 20).isActive = true
label.trailingAnchor.constraint(equalTo: bannerView.trailingAnchor, constant: -20).isActive = true
label.topAnchor.constraint(equalTo: bannerView.topAnchor, constant: 10).isActive = true
bannerView.bottomAnchor.constraint(equalTo: label.bottomAnchor, constant: 10).isActive = true
You will get height of your view or label in viewWillLayoutSubviews() or viewDidLayoutSubviews() method
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
// GET YOUR HEIGHT HERE
}
After adding all constraints to view just call self.view.layoutIfNeeded()
It will force auto layout engine to calculate view size.
I am trying to write a simple composite component for iOS in Swift 3. It consists of a UILabel followed by an UITextField laid out horizontally followed by a line under them. But What happens is the UILabel disappears, UITextField appears on the parent view and line also disappears.
My design in sketch
What it actually looks like in the Storyboard
My component's constraints in the view controller
My intention was to use Auto Layout, anchor the label to top and leading anchors of the view, anchor the textfield to top of the view and trailing anchor of the label with a constant, so they would appear side by side.
I did do a lot of research on this, one site that looked pretty close to what I wanted was https://www.raywenderlich.com/125718/coding-auto-layout, and I think I am following more or less the same approach.
I am doing something obviously wrong, but can't figure out what. Any help is much appreciated, I have been at this for a few days now.
import UIKit
#IBDesignable
class OTextEdit: UIView {
#IBInspectable var LabelText: String = "Label"
#IBInspectable var SecureText: Bool = false
#IBInspectable var Color: UIColor = UIColor.black
#IBInspectable var Text: String = "" {
didSet {
edit.text = Text
}
}
fileprivate let label = UILabel(frame: CGRect(x: 0, y: 0, width: 200, height: 35))
fileprivate let edit = UITextField(frame: CGRect(x: 210, y: 0, width: 200, height: 35))
fileprivate let line: UIView = UIView()
override var intrinsicContentSize: CGSize {
return CGSize(width: 300, height: 100)
}
func setup() {
label.text = LabelText
label.textColor = Color
label.font = UIFont(name: "Avenir Next Condensed", size: 24)
edit.font = UIFont(name: "Avenir Next Condensed", size: 24)
edit.borderStyle = .roundedRect
edit.isSecureTextEntry = SecureText
line.backgroundColor = UIColor.white
self.addSubview(label)
self.addSubview(edit)
self.addSubview(line)
}
override func willMove(toSuperview newSuperview: UIView?) {
super.willMove(toSuperview: newSuperview)
setup()
setupConstaints()
}
func setupConstaints() {
label.translatesAutoresizingMaskIntoConstraints = false
edit.translatesAutoresizingMaskIntoConstraints = false
line.translatesAutoresizingMaskIntoConstraints = false
label.leadingAnchor.constraint(equalTo: leadingAnchor, constant: -10).isActive = true
label.topAnchor.constraint(equalTo: topAnchor)
edit.leadingAnchor.constraint(equalTo: label.leadingAnchor, constant: 10).isActive = true
edit.trailingAnchor.constraint(equalTo: self.trailingAnchor, constant: -20).isActive = true
edit.topAnchor.constraint(equalTo: self.topAnchor)
line.heightAnchor.constraint(equalToConstant: 2.0).isActive = true
line.leadingAnchor.constraint(equalTo: self.leadingAnchor, constant: 10).isActive = true
line.trailingAnchor.constraint(equalTo: self.trailingAnchor, constant: -20).isActive = true
line.topAnchor.constraint(equalTo: label.bottomAnchor, constant: 1.0).isActive = true
}
}
You haven't got a series of constraints top to bottom, so auto layout can't determine the content size of your object. You have tried to set this via the initrinsicContentSize but you shouldn't need to do this.
You also need to set a horizontal hugging priority for your label to let auto layout know that you want the text field to expand:
I removed your override of intrinsicContentSize and changed your constraints to:
Constrain the bottom of the label to the top of the line
Constrain the bottom of the line to the bottom of the superview
Constrain the baseline of the label to the baseline of the text field
Remove the constraint between the top of the text field and the superview
Set the horizontal hugging priority of the label.
func setupConstraints() {
label.translatesAutoresizingMaskIntoConstraints = false
edit.translatesAutoresizingMaskIntoConstraints = false
line.translatesAutoresizingMaskIntoConstraints = false
label.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 10).isActive = true
label.setContentHuggingPriority(.defaultHigh, for: .horizontal)
label.topAnchor.constraint(equalTo: topAnchor)
label.bottomAnchor.constraint(equalTo: line.topAnchor, constant: -8).isActive = true
edit.leadingAnchor.constraint(equalTo: label.trailingAnchor, constant: 10).isActive = true
edit.trailingAnchor.constraint(equalTo: self.trailingAnchor, constant: -20).isActive = true
edit.firstBaselineAnchor.constraint(equalTo: label.firstBaselineAnchor).isActive = true
line.heightAnchor.constraint(equalToConstant: 2.0).isActive = true
line.leadingAnchor.constraint(equalTo: self.leadingAnchor, constant: 10).isActive = true
line.trailingAnchor.constraint(equalTo: self.trailingAnchor, constant: -20).isActive = true
line.topAnchor.constraint(equalTo: label.bottomAnchor, constant: 1.0).isActive = true
line.bottomAnchor.constraint(equalTo: bottomAnchor).isActive = true
}
I think it is pretty close to what you are after.