'Make a UIButton programmatically in Swift
I am trying to build UIs programmatically with Swift.
How can I get this action working?
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let myFirstLabel = UILabel()
let myFirstButton = UIButton()
myFirstLabel.text = "I made a label on the screen #toogood4you"
myFirstLabel.font = UIFont(name: "MarkerFelt-Thin", size: 45)
myFirstLabel.textColor = UIColor.redColor()
myFirstLabel.textAlignment = .Center
myFirstLabel.numberOfLines = 5
myFirstLabel.frame = CGRectMake(15, 54, 300, 500)
myFirstButton.setTitle("✸", forState: .Normal)
myFirstButton.setTitleColor(UIColor.blueColor(), forState: .Normal)
myFirstButton.frame = CGRectMake(15, -50, 300, 500)
myFirstButton.addTarget(self, action: "pressed", forControlEvents: .TouchUpInside)
self.view.addSubview(myFirstLabel)
self.view.addSubview(myFirstButton)
}
func pressed(sender: UIButton!) {
var alertView = UIAlertView();
alertView.addButtonWithTitle("Ok");
alertView.title = "title";
alertView.message = "message";
alertView.show();
}
Solution 1:[1]
You're just missing the colon at the end of the selector name. Since pressed takes a parameter the colon must be there. Also your pressed function shouldn't be nested inside viewDidLoad.
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let myFirstLabel = UILabel()
let myFirstButton = UIButton()
myFirstLabel.text = "I made a label on the screen #toogood4you"
myFirstLabel.font = UIFont(name: "MarkerFelt-Thin", size: 45)
myFirstLabel.textColor = .red
myFirstLabel.textAlignment = .center
myFirstLabel.numberOfLines = 5
myFirstLabel.frame = CGRect(x: 15, y: 54, width: 300, height: 500)
myFirstButton.setTitle("?", for: .normal)
myFirstButton.setTitleColor(.blue, for: .normal)
myFirstButton.frame = CGRect(x: 15, y: -50, width: 300, height: 500)
myFirstButton.addTarget(self, action: #selector(pressed), for: .touchUpInside)
}
@objc func pressed() {
var alertView = UIAlertView()
alertView.addButtonWithTitle("Ok")
alertView.title = "title"
alertView.message = "message"
alertView.show()
}
EDIT: Updated to reflect best practices in Swift 2.2. #selector() should be used rather than a literal string which is deprecated.
Solution 2:[2]
Swift 2.2 Xcode 7.3
Since Objective-C String Literals are deprecated now for button callback methods
let button:UIButton = UIButton(frame: CGRectMake(100, 400, 100, 50))
button.backgroundColor = UIColor.blackColor()
button.setTitle("Button", forState: UIControlState.Normal)
button.addTarget(self, action:#selector(self.buttonClicked), forControlEvents: .TouchUpInside)
self.view.addSubview(button)
func buttonClicked() {
print("Button Clicked")
}
Swift 3 Xcode 8
let button:UIButton = UIButton(frame: CGRect(x: 100, y: 400, width: 100, height: 50))
button.backgroundColor = .black
button.setTitle("Button", for: .normal)
button.addTarget(self, action:#selector(self.buttonClicked), for: .touchUpInside)
self.view.addSubview(button)
func buttonClicked() {
print("Button Clicked")
}
Swift 4 Xcode 9
let button:UIButton = UIButton(frame: CGRect(x: 100, y: 400, width: 100, height: 50))
button.backgroundColor = .black
button.setTitle("Button", for: .normal)
button.addTarget(self, action:#selector(self.buttonClicked), for: .touchUpInside)
self.view.addSubview(button)
@objc func buttonClicked() {
print("Button Clicked")
}
Solution 3:[3]
Swift 4/5
let button = UIButton(frame: CGRect(x: 20, y: 20, width: 200, height: 60))
button.setTitle("Email", for: .normal)
button.backgroundColor = .white
button.setTitleColor(UIColor.black, for: .normal)
button.addTarget(self, action: #selector(self.buttonTapped), for: .touchUpInside)
myView.addSubview(button)
@objc func buttonTapped(sender : UIButton) {
//Write button action here
}
Solution 4:[4]
Swift 4
private func createButton {
let sayButtonT = UIButton(type: .custom)
sayButtonT.addTarget(self, action: #selector(sayAction(_:)), for: .touchUpInside)
}
@objc private func sayAction(_ sender: UIButton?) {
}
Solution 5:[5]
Yeah in simulator. Some times it wont recognise the selector there is a bug it seems. Even i faced not for your code , then i just changed the action name (selector). It works
let buttonPuzzle:UIButton = UIButton(frame: CGRectMake(100, 400, 100, 50))
buttonPuzzle.backgroundColor = UIColor.greenColor()
buttonPuzzle.setTitle("Puzzle", forState: UIControlState.Normal)
buttonPuzzle.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)
buttonPuzzle.tag = 22;
self.view.addSubview(buttonPuzzle)
An example selector function is here:
func buttonAction(sender:UIButton!) {
var btnsendtag:UIButton = sender
if btnsendtag.tag == 22 {
//println("Button tapped tag 22")
}
}
Solution 6:[6]
try these..i hope it helps...
override func viewDidLoad() {
super.viewDidLoad()
let btn = UIButton()
btn.frame = CGRectMake(10, 10, 50, 50) //set frame
btn.setTitle("btn", forState: .Normal) //set button title
btn.setTitleColor(UIColor.redColor(), forState: .Normal) //set button title color
btn.backgroundColor = UIColor.greenColor() //set button background color
btn.tag = 1 // set button tag
btn.addTarget(self, action: "btnclicked:", forControlEvents: .TouchUpInside) //add button action
self.view.addSubview(btn) //add button in view
}
these is buttons click event..
func btnclicked(sender: UIButton!)
{
//write the task you want to perform on buttons click event..
}
Solution 7:[7]
You should be able to create a customize UI button programmatically by accessing the titleLabel property of UIButton.
Per Class Reference in Swift: Regarding the titleLabel property, it says that "although this property is read-only, its own properties are read/write. Use these properties primarily to configure the text of the button."
In Swift, you can directly modify the properties of titleLabel like such:
let myFirstButton = UIButton()
myFirstButton.titleLabel!.text = "I made a label on the screen #toogood4you"
myFirstButton.titleLabel!.font = UIFont(name: "MarkerFelt-Thin", size: 45)
myFirstButton.titleLabel!.textColor = UIColor.red
myFirstButton.titleLabel!.textAlignment = .center
myFirstButton.titleLabel!.numberOfLines = 5
myFirstButton.titleLabel!.frame = CGRect(x: 15, y: 54, width: 300, height: 500)
Edit
Swift 3.1 Syntax
Solution 8:[8]
Swift 5.0
let button = self.makeButton(title: "Login", titleColor: .blue, font: UIFont.init(name: "Arial", size: 18.0), background: .white, cornerRadius: 3.0, borderWidth: 2, borderColor: .black)
view.addSubview(button)
// Adding Constraints
button.heightAnchor.constraint(equalToConstant: 40).isActive = true
button.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 40).isActive = true
button.rightAnchor.constraint(equalTo: view.rightAnchor, constant: -40).isActive = true
button.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -400).isActive = true
button.addTarget(self, action: #selector(pressed(_ :)), for: .touchUpInside)
// Define commmon method
func makeButton(title: String? = nil,
titleColor: UIColor = .black,
font: UIFont? = nil,
background: UIColor = .clear,
cornerRadius: CGFloat = 0,
borderWidth: CGFloat = 0,
borderColor: UIColor = .clear) -> UIButton {
let button = UIButton()
button.translatesAutoresizingMaskIntoConstraints = false
button.setTitle(title, for: .normal)
button.backgroundColor = background
button.setTitleColor(titleColor, for: .normal)
button.titleLabel?.font = font
button.layer.cornerRadius = 6.0
button.layer.borderWidth = 2
button.layer.borderColor = UIColor.red.cgColor
return button
}
// Button Action
@objc func pressed(_ sender: UIButton) {
print("Pressed")
}
Solution 9:[9]
Swift 3: You can create a UIButton programmatically
either inside a methods scope for example in ViewDidLoad()
Be sure to add constraints to the button, otherwise you wont see it
let button = UIButton()
button.translatesAutoresizingMaskIntoConstraints = false
button.target(forAction: #selector(buttonAction), withSender: self)
//button.backgroundColor etc
view.addSubview(button)
@objc func buttonAction() {
//some Action
}
or outside your scope as global variable to access it from anywhere in your module
let button: UIButton = {
let b = UIButton()
b.translatesAutoresizingMaskIntoConstraints = false
//b.backgroundColor etc
return b
}()
and then you setup the constraints
func setupButtonView() {
view.addSubview(button)
button.widthAnchor.constraint(equalToConstant: 40).isActive = true
button.heightAnchor.constraint(equalToConstant: 40).isActive = true
// etc
}
Solution 10:[10]
Swift: Ui Button create programmatically,
var button: UIButton = UIButton(type: .Custom)
button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0)
button.addTarget(self, action: #selector(self.aMethod), forControlEvents: .TouchUpInside)
button.tag=2
button.setTitle("Hallo World", forState: .Normal)
view.addSubview(button)
func aMethod(sender: AnyObject) {
print("you clicked on button \(sender.tag)")
}
Solution 11:[11]
Swift "Button factory" extension for UIButton (and while we're at it) also for UILabel like so:
extension UILabel
{
// A simple UILabel factory function
// returns instance of itself configured with the given parameters
// use example (in a UIView or any other class that inherits from UIView):
// addSubview( UILabel().make( x: 0, y: 0, w: 100, h: 30,
// txt: "Hello World!",
// align: .center,
// fnt: aUIFont,
// fntColor: UIColor.red) )
//
func make(x: CGFloat, y: CGFloat, w: CGFloat, h: CGFloat,
txt: String,
align: NSTextAlignment,
fnt: UIFont,
fntColor: UIColor)-> UILabel
{
frame = CGRect(x: x, y: y, width: w, height: h)
adjustsFontSizeToFitWidth = true
textAlignment = align
text = txt
textColor = fntColor
font = fnt
return self
}
// Of course, you can make more advanced factory functions etc.
// Also one could subclass UILabel, but this seems to be a convenient case for an extension.
}
extension UIButton
{
// UIButton factory returns instance of UIButton
//usage example:
// addSubview(UIButton().make(x: btnx, y:100, w: btnw, h: btnh,
// title: "play", backColor: .red,
// target: self,
// touchDown: #selector(play), touchUp: #selector(stopPlay)))
func make( x: CGFloat,y: CGFloat,
w: CGFloat,h: CGFloat,
title: String, backColor: UIColor,
target: UIView,
touchDown: Selector,
touchUp: Selector ) -> UIButton
{
frame = CGRect(x: x, y: y, width: w, height: h)
backgroundColor = backColor
setTitle(title, for: .normal)
addTarget(target, action: touchDown, for: .touchDown)
addTarget(target, action: touchUp , for: .touchUpInside)
addTarget(target, action: touchUp , for: .touchUpOutside)
return self
}
}
Tested in Swift in Xcode Version 9.2 (9C40b) Swift 4.x
Solution 12:[12]
I have given the example for create the button and set constraint in coding. This code also contains the programmatically button action.
import UIKit
class ViewController: UIViewController {
lazy var button: UIButton! = {
let button = UIButton()
button.translatesAutoresizingMaskIntoConstraints = false
button.backgroundColor = .darkGray
button.setTitleColor(.white, for: .normal)
button.addTarget(self, action: #selector(didTaped(_:)), for: .touchUpInside)
button.tag = 1
button.setTitle("Tap", for: .normal)
return button
}()
lazy var label: UILabel! = {
let label = UILabel()
label.translatesAutoresizingMaskIntoConstraints = false
label.textColor = .black
label.font = .systemFont(ofSize: 17)
label.textAlignment = .center
return label
}()
override var preferredStatusBarStyle: UIStatusBarStyle{
return .darkContent
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
self.view.backgroundColor = .white
self.setConstraint()
}
@objc func didTaped(_ sender: UIButton){
self.label.text = "No of times Taped: \(sender.tag)"
self.button.tag += 1
}
func setConstraint(){
self.view.addSubview(self.button)
self.view.addSubview(self.label)
NSLayoutConstraint.activate([
self.button.heightAnchor.constraint(equalToConstant: 60),
self.button.widthAnchor.constraint(equalToConstant: UIScreen.main.bounds.width * 0.66),
self.button.centerXAnchor.constraint(equalTo: self.view.centerXAnchor),
self.button.centerYAnchor.constraint(equalTo: self.view.centerYAnchor),
self.label.centerXAnchor.constraint(equalTo: self.view.centerXAnchor),
self.label.topAnchor.constraint(equalTo: self.button.topAnchor, constant: UIScreen.main.bounds.height * 0.12),
self.label.leadingAnchor.constraint(equalTo: self.view.leadingAnchor, constant: 10),
])
}
}
Output:
Solution 13:[13]
Swift: Ui Button create programmatically
let myButton = UIButton()
myButton.titleLabel!.frame = CGRectMake(15, 54, 300, 500)
myButton.titleLabel!.text = "Button Label"
myButton.titleLabel!.textColor = UIColor.redColor()
myButton.titleLabel!.textAlignment = .Center
Solution 14:[14]
For Swift 3 Xcode 8.......
let button = UIButton(frame: CGRect(x: 0, y: 0, width: container.width, height: container.height))
button.addTarget(self, action: #selector(self.barItemTapped), for: .touchUpInside)
func barItemTapped(sender : UIButton) {
//Write button action here
}
Solution 15:[15]
UIButton with constraints in iOS 9.1/Xcode 7.1.1/Swift 2.1:
import UIKit
import MapKit
class MapViewController: UIViewController {
override func loadView() {
mapView = MKMapView() //Create a view...
view = mapView //assign it to the ViewController's (inherited) view property.
//Equivalent to self.view = mapView
myButton = UIButton(type: .RoundedRect) //RoundedRect is an alias for System (tested by printing out their rawValue's)
//myButton.frame = CGRect(x:50, y:500, width:70, height:50) //Doesn't seem to be necessary when using constraints.
myButton.setTitle("Current\nLocation", forState: .Normal)
myButton.titleLabel?.lineBreakMode = .ByWordWrapping //If newline in title, split title onto multiple lines
myButton.titleLabel?.textAlignment = .Center
myButton.setTitleColor(UIColor.whiteColor(), forState: .Normal)
myButton.layer.cornerRadius = 6 //For some reason, a button with type RoundedRect has square corners
myButton.backgroundColor = UIColor.redColor().colorWithAlphaComponent(0.5) //Make the color partially transparent
//Attempt to add padding around text. Shrunk the frame when I tried it. Negative values had no effect.
//myButton.titleEdgeInsets = UIEdgeInsetsMake(-10,-10,-10,-10)
myButton.contentEdgeInsets = UIEdgeInsetsMake(5,5,5,5) //Add padding around text.
myButton.addTarget(self, action: "getCurrentLocation:", forControlEvents: .TouchUpInside)
mapView.addSubview(myButton)
//Button Constraints:
myButton.translatesAutoresizingMaskIntoConstraints = false //***
//bottomLayoutGuide(for tab bar) and topLayoutGuide(for status bar) are properties of the ViewController
//To anchor above the tab bar on the bottom of the screen:
let bottomButtonConstraint = myButton.bottomAnchor.constraintEqualToAnchor(bottomLayoutGuide.topAnchor, constant: -20) //Implied call of self.bottomLayoutGuide. Anchor 20 points **above** the top of the tab bar.
//To anchor to the blue guide line that is inset from the left
//edge of the screen in InterfaceBuilder:
let margins = view.layoutMarginsGuide //Now the guide is a property of the View.
let leadingButtonConstraint = myButton.leadingAnchor.constraintEqualToAnchor(margins.leadingAnchor)
bottomButtonConstraint.active = true
leadingButtonConstraint.active = true
}
func getCurrentLocation(sender: UIButton) {
print("Current Location button clicked!")
}
The button is anchored to the bottom left corner, above the tab bar.
Solution 16:[16]
In Swift We Can Make A button programmatically by writing this code in our viewcontroller.swift file...
import UIKit
class ViewController: UIViewController
{
private let firstbutton:UIButton = UIButton()
override func viewDidLoad() {
super.viewDidLoad()
self.firstbutton = UIButton.buttonWithType(UIButtonType.Custom) as? UIButton
self.firstbutton!.frame = CGRectMake(100, 200, 100, 100)
self.firstbutton!.backgroundColor = UIColor.redColor()
self.firstbutton!.setTitle("My Button", forState: UIControlState.Normal)
self.firstbutton!.addTarget(self, action:#selector(self.firstButtonClicked), forControlEvents: .TouchUpInside)
self.view.addSubview(firstbutton!)
}
func firstButtonClicked(){
print("First Button Clicked")
}
Solution 17:[17]
Swift 4.2 - XCode 10.1
Using a closure
let button: UIButton = {
let button = UIButton(type: .system)
button.titleLabel?.font = UIFont.systemFont(ofSize: 20)
...
return button
}()
Solution 18:[18]
In iOS 12, Swift 4.2 & XCode 10.1
//For system type button
let button = UIButton(type: .system)
button.frame = CGRect(x: 100, y: 250, width: 100, height: 50)
// button.backgroundColor = .blue
button.setTitle("Button", for: .normal)
button.setTitleColor(.white, for: .normal)
button.titleLabel?.font = UIFont.boldSystemFont(ofSize: 13.0)
button.titleLabel?.textAlignment = .center//Text alighment center
button.titleLabel?.numberOfLines = 0//To display multiple lines in UIButton
button.titleLabel?.lineBreakMode = .byWordWrapping//By word wrapping
button.tag = 1//To assign tag value
button.btnProperties()//Call UIButton properties from extension function
button.addTarget(self, action:#selector(self.buttonClicked), for: .touchUpInside)
self.view.addSubview(button)
//For custom type button (add image to your button)
let button2 = UIButton(type: .custom)
button2.frame = CGRect(x: 100, y: 400, width: 100, height: 50)
// button2.backgroundColor = .blue
button2.setImage(UIImage.init(named: "img.png"), for: .normal)
button2.tag = 2
button2.btnProperties()//Call UIButton properties from extension function
button2.addTarget(self, action:#selector(self.buttonClicked), for: .touchUpInside)
self.view.addSubview(button2)
@objc func buttonClicked(sender:UIButton) {
print("Button \(sender.tag) clicked")
}
//You can add UIButton properties like this also
extension UIButton {
func btnProperties() {
layer.cornerRadius = 10//Set button corner radious
clipsToBounds = true
backgroundColor = .blue//Set background colour
//titleLabel?.textAlignment = .center//add properties like this
}
}
Solution 19:[19]
In iOS 15 apple has introduced configuration(.gray(), .filled() and more) with the Button. There are lot more options with configuration.
var grayButton: UIButton!
func addButton() {
grayButton = UIButton(configuration: .gray())
grayButton.addTarget(self, action: #selector(buttonPressed(_:)), for: .touchUpInside)
grayButton.frame = CGRect(x: 10, y: 50, width: 150, height: 50)
grayButton.configuration?.title = "Press Me"
grayButton.configuration?.subtitle = "Sub Title"
grayButton.configuration?.image = UIImage(systemName: "house")
grayButton.configuration?.imagePadding = 10
grayButton.configuration?.imagePlacement = .leading
view.addSubview(grayButton)
}
@objc func buttonPressed(_ sender: UIButton) {
grayButton.configuration?.showsActivityIndicator = true
DispatchQueue.main.asyncAfter(deadline: .now() + 3) {
self.grayButton.configuration?.showsActivityIndicator = false
}
}
Also we can show and hide activity indicator inside the button with showsActivityIndicator property.
Solution 20:[20]
override func viewDidLoad() {
super.viewDidLoad()
let menuButton = UIButton(frame: .zero)
menuButton.addTarget(self, action: #selector(menuTapped), for: .touchUpInside)
view.addSubView(menuButton)
}
@objc func menuTapped() {
// do Stuff
}
Solution 21:[21]
If you go into the Main storyboard part, and in the bottom right go to the circle with a square, and use a blank button. Then in the code use @IBAction with it to get it wired in. Then you can make a @IBAction function with it.
Sources
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Source: Stack Overflow