Make a UIButton programmatically in Swift

Question

I am trying to build UI s programmatically  How do I get this action working  I am developing with Swift   Code in 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   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

User · Answer

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

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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   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   selector myClass pressed       forControlEvents   TouchUpInside      self view addSubview myFirstLabel      self view addSubview myFirstButton      objc func pressed sender  UIButton         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

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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

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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 - gt  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   - gt  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

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In iOS 12  Swift 4 2  amp  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

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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

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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

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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

User · Answer

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

User · Answer

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

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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

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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

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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

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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

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Swift 4      private func createButton           let sayButtonT   UIButton type   custom          sayButtonT addTarget self  action   selector sayAction       for   touchUpInside              objc private func sayAction   sender  UIButton

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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  - gt  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

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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

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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

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