I want to initialize a button's title from a Label. I have this code:
let smallSquare = CGSize(width: 30, height: 30)
let button = UIButton(frame: CGRect(origin: CGPointZero, size: smallSquare))
But, I do not know how I can initialize a title with my label:
let label = UILabel(frame: CGRectMake(0, 0, 200, 21))
label.center = CGPointMake(160, 284)
label.textAlignment = NSTextAlignment.Center
label.text = "I'am a test label"
Normally, I use this property to add a title with a string:
button.setTitle("Button Title",for: .normal)
Is it possible to simply put my Label in my button's title?
Thanks in advance
You can add you custom label as subview to your button like Mike Alter mentioned in the comments like this (Note: Code is in Swift 3, but should be easy to adopt to Swift 2.*. Hints are in the code comments):
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .white
let smallSquare = CGSize(width: 30, height: 30)
let button = UIButton(frame: CGRect(origin: .zero, size: smallSquare))
button.translatesAutoresizingMaskIntoConstraints = false
button.backgroundColor = .red
// add the button to your view
view.addSubview(button)
// set constraints of your button
button.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
button.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
let label = UILabel(frame: CGRect(x: 0, y: 0, width: 200, height: 21))
label.translatesAutoresizingMaskIntoConstraints = false
label.center = CGPoint(x: 160, y: 284)
label.textAlignment = .center
label.text = "I'm a test label"
// add the label to your button
button.addSubview(label)
// set constraints of your label
label.centerXAnchor.constraint(equalTo: button.centerXAnchor).isActive = true
label.centerYAnchor.constraint(equalTo: button.centerYAnchor).isActive = true
}
}
Result with your custom values looks like this (Just added the red background of the button so you see the frame of the button compared to the label frame):
Your label has a text property. You used it to set a value and you can also use it to get the value. The text is optional, so you need to unwrap.
let labelText = label.text ?? ""
button.setTitle(labelText, for: .normal)
if let textFromLabel = yourCustomLabel.text {
yourButton.setTitle(textFromLabel, .normal)
}
is what I'll suggest you to do
Related
Inside the viewDidAppear I have a function that contains this code, in order to make a UIView:
let contentView = UIView()
func addSleepingView() {
contentView.backgroundColor = .systemYellow.withAlphaComponent(0.25)
view.addSubview(contentView)
contentView.translatesAutoresizingMaskIntoConstraints = false
contentView.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
contentView.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
// Anchor your view right above the tabBar
contentView.bottomAnchor.constraint(equalTo: (tabBarController?.tabBar.topAnchor)!).isActive = true
contentView.heightAnchor.constraint(equalToConstant: 50).isActive = true
let label = UILabel()
label.text = "Test"
label.frame = CGRect(x: 0, y: 0, width: 25, height: 34.0)
label.lineBreakMode = .byWordWrapping
label.numberOfLines = 0
label.textAlignment = .center
label.translatesAutoresizingMaskIntoConstraints = false
contentView.addSubview(label)
label.centerXAnchor.constraint(equalTo: contentView.centerXAnchor).isActive = true
label.centerYAnchor.constraint(equalTo: contentView.centerYAnchor).isActive = true
let button = UIButton()
button.setImage(UIImage(systemName: "arrow.clockwise", withConfiguration: UIImage.SymbolConfiguration(scale: .large)), for: UIControl.State.normal)
button.tintColor = .systemGray
button.frame = CGRect(x: self.view.bounds.width-42, y: 8, width: 34, height: 34.0)
button.isUserInteractionEnabled = true
button.addTarget(self, action: #selector(wakeupFunction), for: .touchUpInside)
contentView.addSubview(button)
let button2 = UIButton()
button2.setImage(UIImage(systemName: "exclamationmark.triangle", withConfiguration: UIImage.SymbolConfiguration(scale: .large)), for: UIControl.State.normal)
button2.tintColor = .label
button2.frame = CGRect(x: 8, y: 8, width: 34, height: 34.0)
button2.isUserInteractionEnabled = false
contentView.addSubview(button2)
contentView.bringSubviewToFront(button)
}
This is what it looks like:
Now this is exactly how I want it. The problem comes when I change tab. For example go to the last tab, and back to the first tab again. Then it looks like this:
What am I doing wrong here?
You can just add your code of activating constraints inside the DispatchQueue.main block
Updated Line you can change and it will start working as you're expectation.
// Anchor your view right above the tabBar
DispatchQueue.main.async
{
self.contentView.bottomAnchor.constraint(equalTo: (self.tabBarController?.tabBar.topAnchor)!).isActive = true
self.contentView.heightAnchor.constraint(equalToConstant: 50).isActive = true
}
My wish is to make centered image(left) and next to it(right) the label.
Without setting an image, there was a perfectly centered titleLabel:
btnWhatsapp.titleLabel?.adjustsFontSizeToFitWidth = true
btnWhatsapp.setTitle("WhatsApp", for: .normal)
Then I added this code to add an image:
btnWhatsapp.setImage(UIImage(named: "phoneIcon"), for: .normal)
btnWhatsapp.imageView?.layer.transform = CATransform3DMakeScale(0.5, 0.6, 0.5)
btnWhatsapp.imageView?.contentMode = .scaleAspectFit
, and this iswhat I got then:
, so the title disappeared.
Maybe the problem is that image uses more space than its actual size(the size shouldnt take more widht and height than the icon size). I saw this when changed images background(should be this much grey color):
btnWhatsapp.imageView?.backgroundColor = .gray
I tried to use the imageEdgeInsets but it is very hard to calculate it to fit perfectly on every iPhone.
This is the Attributes inspector of the button:
You can't set title and image at once by default, nor position them as you describe.
If you need to have a UIButton, I'd recommend to make a UIView (or possibly horizontal UIStackView) with UIImage and UILabel inside, position them with autolayout, then you can add this view to the UIButton as a subview.
let button = UIButton(type: .custom)
button.frame = viewFrame // This is the desired frame of your custom UIView or UIStackView
button.addSubview(customView)
You will be able to position the views easily for all sizes with this approach, but you will probably want to use autolayout in real word app, instead of hardcoded frames.
Example:
override func viewDidLoad() {
super.viewDidLoad()
let image = UIImageView(frame: CGRect(x: 0, y: 0, width: 50, height: 50))
let label = UILabel(frame: CGRect(x: 0, y: 0, width: 50, height: 50))
label.text = "text"
let stack = UIStackView(arrangedSubviews: [image, label])
stack.frame = CGRect(x: 0, y: 0, width: 100, height: 50)
stack.distribution = .fillEqually
let button = UIButton()
button.frame = CGRect(x: 0, y: 0, width: 100, height: 50)
button.addSubview(stack)
view.addSubview(button)
self.view.addSubview(button)
}
Set your button under your controller class like this:
let imageButton: UIButton = {
let b = UIButton(type: .custom)
b.backgroundColor = #colorLiteral(red: 0.3411764801, green: 0.6235294342, blue: 0.1686274558, alpha: 1)
b.layer.cornerRadius = 12
b.clipsToBounds = true
b.translatesAutoresizingMaskIntoConstraints = false
let imageV = UIImageView()
imageV.image = UIImage(named: "yourImage")?.withRenderingMode(.alwaysTemplate)
imageV.tintColor = .white
imageV.contentMode = .scaleAspectFill
imageV.translatesAutoresizingMaskIntoConstraints = false
imageV.widthAnchor.constraint(equalToConstant: 30).isActive = true
let label = UILabel()
label.text = "WhatsApp"
label.textColor = .white
label.font = .systemFont(ofSize: 16, weight: .regular)
let stack = UIStackView(arrangedSubviews: [imageV, label])
stack.distribution = .fill
stack.spacing = 4
stack.axis = .horizontal
stack.translatesAutoresizingMaskIntoConstraints = false
b.addSubview(stack)
stack.heightAnchor.constraint(equalToConstant: 30).isActive = true
stack.widthAnchor.constraint(equalToConstant: 120).isActive = true
stack.centerXAnchor.constraint(equalTo: b.centerXAnchor).isActive = true
stack.centerYAnchor.constraint(equalTo: b.centerYAnchor).isActive = true
return b
}()
Now in viewDidLoad add button and set constraints in your view (in my case on top)
view.addSubview(imageButton)
imageButton.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 20).isActive = true
imageButton.heightAnchor.constraint(equalToConstant: 50).isActive = true
imageButton.widthAnchor.constraint(equalToConstant: 200).isActive = true
imageButton.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
This is the result:
I have a string Ex: Arya said "We must find a solution" yesterday. Here I want to restrict the width of the text in bold ("We must find a solution") to 100, but others must not be shortened. So I added it as 3 different NSMutableAttributedStrings appended together and set this to a UILabel. I want to know if I can restrict the width of one of these strings alone.
I tried the following :
let mutableString = "We must find a solution"
mutableString.draw(in: CGRect(x: 0, y: 0, width: 100, height: 30))
mutableString.draw(with: CGRect(x: 0, y: 0, width: 10, height: 10), options: .truncatesLastVisibleLine, context: .none)
mutableString.boundingRect(with: CGSize(width: 100, height: 40), options: [.truncatesLastVisibleLine,.usesFontLeading], context: .none)
But none of them worked. I want to reproduce the UILabel .lineBreakMode = .byTruncatingTail for a NSMutableAttributedString. Am I doing something wrong here, is there a way to achieve this?
Here is a solution using three UILabels in a UIStackView:
override func viewDidLoad() {
super.viewDidLoad()
let label1 = UILabel()
label1.text = "Arya said"
label1.font = UIFont.italicSystemFont(ofSize: 20.0)
let label2 = UILabel()
label2.text = "\"We must find a solution\""
label2.font = UIFont.boldSystemFont(ofSize: 20.0)
label2.lineBreakMode = .byTruncatingTail
let label3 = UILabel()
label3.text = "yesterday"
label3.font = UIFont.italicSystemFont(ofSize: 20.0)
let stack = UIStackView(arrangedSubviews: [label1, label2, label3])
stack.axis = .horizontal
stack.spacing = 4
label2.translatesAutoresizingMaskIntoConstraints = false
stack.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
label2.widthAnchor.constraint(equalToConstant: 100)
])
self.view.addSubview(stack)
NSLayoutConstraint.activate([
stack.centerXAnchor.constraint(equalTo: self.view.centerXAnchor),
stack.centerYAnchor.constraint(equalTo: self.view.centerYAnchor)
])
}
output:
I'm trying to dynamically set my navigation bar's text so that the header text always fits. I'm acccomplishing that like this:
// Pet's Day text "Joy's Day"
if let range = currentPet.range(of: "_") {
let petsName = currentPet[range.upperBound..<currentPet.endIndex]
let deviceWidth = UIScreen.main.bounds.size.width
let titleLabel = UILabel(frame: CGRect(x: 0, y: 0, width: deviceWidth, height: 40))
titleLabel.text = "\(petsName)'s Day"
titleLabel.font = UIFont.systemFont(ofSize: 30)
titleLabel.backgroundColor = UIColor.clear
titleLabel.textColor = UIColor.white
titleLabel.adjustsFontSizeToFitWidth = true
titleLabel.minimumScaleFactor = 0.5
titleLabel.textAlignment = .center
self.navBar.topItem?.titleView = titleLabel
}
However, as seen by this picture, this lowers the header text below its natural height:
The navigation bar on the left is from one of my app's other views, while the one on the right is the one I'm setting.
Both of these navigation bars are navigation bars that I've dragged in and made the prompt equal to an empty string to increase their height:
Can anybody please help me implement my code above so that it doesn't drop down the header text?
**Edit: Here are screenshots from Xcode's debug hierarchy:
This is the normal navigation bar:
This is the one I'm setting:
You need to set the baseline, by default is Align Baseline, you need to change to Align Centers
Code example:
class TestViewController: UIViewController {
#IBOutlet weak var navBar: UINavigationBar!
override func viewDidLoad() {
super.viewDidLoad()
// Change the height of the navbar
self.navBar.frame = CGRect(x: 0, y: 0, width: self.view.bounds.width, height: 68)
let deviceWidth = UIScreen.main.bounds.size.width
let titleLabel = UILabel(frame: CGRect(x: 0, y: 0, width: deviceWidth, height: 40))
titleLabel.text = "Log Events" // Change to Joy's Day and check the result
titleLabel.font = UIFont.systemFont(ofSize: 30)
titleLabel.baselineAdjustment = .alignBaselines
titleLabel.textColor = UIColor.white
titleLabel.adjustsFontSizeToFitWidth = true
titleLabel.minimumScaleFactor = 0.5
titleLabel.textAlignment = .center
self.navBar.topItem?.titleView = titleLabel
}
}
How do I create a UILabel programmatically using Swift in Xcode 6?
I have started with a new "Single View Application" in Xcode 6 and selected Swift for this project. I have my files AppDelegate.swift and ViewController.swift and I'm not sure what to do from here.
Creating a UILabel programmatically in Swift 3+:
override func viewDidLoad() {
super.viewDidLoad()
let label = UILabel(frame: CGRect(x: 0, y: 0, width: 200, height: 21))
label.center = CGPoint(x: 160, y: 285)
label.textAlignment = .center
label.text = "I'm a test label"
self.view.addSubview(label)
}
Here is the correct code for Swift 3, with comments for instructional purposes:
override func viewDidLoad()
{
super.viewDidLoad()
// CGRectMake has been deprecated - and should be let, not var
let label = UILabel(frame: CGRect(x: 0, y: 0, width: 200, height: 21))
// you will probably want to set the font (remember to use Dynamic Type!)
label.font = UIFont.preferredFont(forTextStyle: .footnote)
// and set the text color too - remember good contrast
label.textColor = .black
// may not be necessary (e.g., if the width & height match the superview)
// if you do need to center, CGPointMake has been deprecated, so use this
label.center = CGPoint(x: 160, y: 284)
// this changed in Swift 3 (much better, no?)
label.textAlignment = .center
label.text = "I am a test label"
self.view.addSubview(label)
}
Just to add onto the already great answers, you might want to add multiple labels in your project so doing all of this (setting size, style etc) will be a pain. To solve this, you can create a separate UILabel class.
import UIKit
class MyLabel: UILabel {
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
initializeLabel()
}
override init(frame: CGRect) {
super.init(frame: frame)
initializeLabel()
}
func initializeLabel() {
self.textAlignment = .left
self.font = UIFont(name: "Halvetica", size: 17)
self.textColor = UIColor.white
}
}
To use it, do the following
import UIKit
class ViewController: UIViewController {
var myLabel: MyLabel()
override func viewDidLoad() {
super.viewDidLoad()
myLabel = MyLabel(frame: CGRect(x: self.view.frame.size.width / 2, y: self.view.frame.size.height / 2, width: 100, height: 20))
self.view.addSubView(myLabel)
}
}
Swift 4.X and Xcode 10
let lbl = UILabel(frame: CGRect(x: 10, y: 50, width: 230, height: 21))
lbl.textAlignment = .center //For center alignment
lbl.text = "This is my label fdsjhfg sjdg dfgdfgdfjgdjfhg jdfjgdfgdf end..."
lbl.textColor = .white
lbl.backgroundColor = .lightGray//If required
lbl.font = UIFont.systemFont(ofSize: 17)
//To display multiple lines in label
lbl.numberOfLines = 0 //If you want to display only 2 lines replace 0(Zero) with 2.
lbl.lineBreakMode = .byWordWrapping //Word Wrap
// OR
lbl.lineBreakMode = .byCharWrapping //Charactor Wrap
lbl.sizeToFit()//If required
yourView.addSubview(lbl)
If you have multiple labels in your class use extension to add properties.
//Label 1
let lbl1 = UILabel(frame: CGRect(x: 10, y: 50, width: 230, height: 21))
lbl1.text = "This is my label fdsjhfg sjdg dfgdfgdfjgdjfhg jdfjgdfgdf end..."
lbl1.myLabel()//Call this function from extension to all your labels
view.addSubview(lbl1)
//Label 2
let lbl2 = UILabel(frame: CGRect(x: 10, y: 150, width: 230, height: 21))
lbl2.text = "This is my label fdsjhfg sjdg dfgdfgdfjgdjfhg jdfjgdfgdf end..."
lbl2.myLabel()//Call this function from extension to all your labels
view.addSubview(lbl2)
extension UILabel {
func myLabel() {
textAlignment = .center
textColor = .white
backgroundColor = .lightGray
font = UIFont.systemFont(ofSize: 17)
numberOfLines = 0
lineBreakMode = .byCharWrapping
sizeToFit()
}
}
Create UILabel view outside viewDidLoad class and then add that view to your main view in viewDidLoad method.
lazy var myLabel: UILabel = {
let label = UILabel()
label.translatesAutoresizingMaskIntoConstraints = false
label.text = "This is label view."
label.font = UIFont.systemFont(ofSize: 12)
return label
}()
And then add that view in viewDidLoad()
override func viewDidLoad() {
super.viewDidLoad()
view.addSubview(myLabel)
// Set its constraint to display it on screen
myLabel.widthAnchor.constraint(equalToConstant: 200).isActive = true
myLabel.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
myLabel.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
}
You can create a label using the code below. Updated.
let yourLabel: UILabel = UILabel()
yourLabel.frame = CGRect(x: 50, y: 150, width: 200, height: 21)
yourLabel.backgroundColor = UIColor.orange
yourLabel.textColor = UIColor.black
yourLabel.textAlignment = NSTextAlignment.center
yourLabel.text = "test label"
self.view.addSubview(yourLabel)
Another answer in Swift 3:
let myLabel = UILabel()
myLabel.frame = CGRect(x: 0, y: 0, width: 100, height: 100)
myLabel.center = CGPoint(x: 0, y: 0)
myLabel.textAlignment = .center
myLabel.text = "myLabel!!!!!"
self.view.addSubview(myLabel)
Create label in swift 4
let label = UILabel(frame: CGRect(x: self.view.frame.origin.x, y: self.view.frame.origin.y, width: self.view.frame.size.width, height: 50))
label.textAlignment = .center
label.text = "Hello this my label"
//To set the color
label.backgroundColor = UIColor.white
label.textColor = UIColor.black
//To set the font Dynamic
label.font = UIFont(name: "Helvetica-Regular", size: 20.0)
//To set the system font
label.font = UIFont.systemFont(ofSize: 20.0)
//To display multiple lines
label.numberOfLines = 0
label.lineBreakMode = .byWordWrapping //Wrap the word of label
label.lineBreakMode = .byCharWrapping //Wrap the charactor of label
label.sizeToFit()
self.view.addSubview(label)
An alternative using a closure to separate out the code into something a bit neater using Swift 4:
class theViewController: UIViewController {
/** Create the UILabel */
var theLabel: UILabel = {
let label = UILabel()
label.lineBreakMode = .byWordWrapping
label.textColor = UIColor.white
label.textAlignment = .left
label.numberOfLines = 3
label.font = UIFont(name: "Helvetica-Bold", size: 22)
return label
}()
override func viewDidLoad() {
/** Add theLabel to the ViewControllers view */
view.addSubview(theLabel)
}
override func viewDidLayoutSubviews() {
/* Set the frame when the layout is changed */
theLabel.frame = CGRect(x: 0,
y: 0,
width: view.frame.width - 30,
height: 24)
}
}
As a note, attributes for theLabel can still be changed whenever using functions in the VC. You're just setting various defaults inside the closure and minimizing clutter in functions like viewDidLoad()
Swift 4.2 and Xcode 10. Somewhere in ViewController:
private lazy var debugInfoLabel: UILabel = {
let label = UILabel()
label.textColor = .white
label.translatesAutoresizingMaskIntoConstraints = false
yourView.addSubview(label)
NSLayoutConstraint.activate([
label.centerXAnchor.constraint(equalTo: suggestionView.centerXAnchor),
label.centerYAnchor.constraint(equalTo: suggestionView.centerYAnchor, constant: -100),
label.widthAnchor.constraint(equalToConstant: 120),
label.heightAnchor.constraint(equalToConstant: 50)])
return label
}()
...
Using:
debugInfoLabel.text = debugInfo
let label = UILabel(frame: CGRect(x: 0, y: 0, width: 200, height: 21))
label.center = CGPoint(x: 160, y: 285)
label.textAlignment = .center
label.text = "My label"
self.view.addSubview(label)
Try above code in ViewDidLoad
Swift 4.2 and Xcode 10
Initialize label before viewDidLoad.
lazy var topLeftLabel: UILabel = {
let label = UILabel()
label.translatesAutoresizingMaskIntoConstraints = false
label.text = "TopLeft"
return label
}()
In viewDidLoad add label to the view and apply constraints.
override func viewDidLoad() {
super.viewDidLoad()
view.addSubview(topLeftLabel)
topLeftLabel.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 10).isActive = true
topLeftLabel.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 10).isActive = true
}