Reputation: 3202
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.
Upvotes: 134
Views: 270920
Reputation: 2872
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)
Upvotes: 9
Reputation: 670
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
}
Upvotes: 18
Reputation: 3812
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)
}
Upvotes: 281
Reputation: 1187
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)
Upvotes: 11
Reputation: 39
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
Upvotes: 3
Reputation: 765
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
}
Upvotes: 1
Reputation: 17942
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()
}
}
Upvotes: 17
Reputation: 534
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)
Upvotes: 6
Reputation:
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
Upvotes: 1
Reputation: 890
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()
Upvotes: 5
Reputation: 2818
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)
}
}
Upvotes: 17
Reputation: 2347
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)
}
Upvotes: 28