ios - Make a UIButton programmatically in Swift -

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i trying build ui's programmatically. how action working? developing swift.

code in viewdidload:

override func viewdidload() {         super.viewdidload()         // additional setup after loading view, typically nib.         let myfirstlabel = uilabel()         let myfirstbutton = uibutton()         myfirstlabel.text = "i made label on 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();         }

you're missing colon @ end of selector name. since pressed takes parameter colon must there. pressed function shouldn't nested inside viewdidload.

override func viewdidload() {     super.viewdidload()     // additional setup after loading view, typically nib.     let myfirstlabel = uilabel()     let myfirstbutton = uibutton()     myfirstlabel.text = "i made label on 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 reflect best practices in swift 2.2. #selector() should used rather literal string deprecated.


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