ios - button placed on top of UIVisualEffectView not responding -


i'm trying add button uivisualeffectview. however, button add not responding touch events , don't understand why. code.

override func viewdidload() {         super.viewdidload()         let image = uiimage(named: "face2")         let imageview = uiimageview(image: image)         imageview.frame = cgrectmake(0, 0, 200, 200)         let button = uibutton(frame: cgrectmake(50, 50, 100, 100))         button.settitle("huhuhu", forstate: uicontrolstate.normal)         button.settitlecolor(uicolor.blackcolor(), forstate: .normal)         button.userinteractionenabled = true          let effect = uiblureffect(style: .light)         let blurview = uivisualeffectview(effect: effect)         blurview.frame = view.bounds          view.addsubview(imageview)         view.addsubview(blurview)         view.addsubview(button)     }

you need add target action (button.addtarget), i.e. button supposed when pressed, see code modified below:

    class viewcontroller: uiviewcontroller {      override func viewdidload() {         super.viewdidload()         // additional setup after loading view, typically nib.          let image = uiimage(named: "face2")         let imageview = uiimageview(image: image)         imageview.frame = cgrectmake(0, 0, 200, 200)         let button = uibutton(frame: cgrectmake(50, 50, 100, 100))         button.settitle("huhuhu", forstate: uicontrolstate.normal)         button.addtarget(self, action: "sayhi:", forcontrolevents: .touchupinside)         button.settitlecolor(uicolor.blackcolor(), forstate: .normal)         button.userinteractionenabled = true          let effect = uiblureffect(style: .light)         let blurview = uivisualeffectview(effect: effect)         blurview.frame = view.bounds          view.addsubview(imageview)         view.addsubview(blurview)         view.addsubview(button)     }      override func didreceivememorywarning() {         super.didreceivememorywarning()         // dispose of resources can recreated.     }       func sayhi(sender:uibutton) {         let randominth = arc4random_uniform(uint32(view.bounds.size.width)-40)         let randomintv = arc4random_uniform(uint32(view.bounds.size.height)-15)         let frame = cgrectmake(cgfloat(randominth), cgfloat(randomintv), 10, 10)         let label = uilabel(frame: frame)         label.text = "hallo"         label.sizetofit()         view.addsubview(label)     } }

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