选中 “Show the assistant editor”
UIControl的属性和方法: alignment content state enabled selected highlighted contentVerticalAlignment contentHorizontalAlignment
addTarget(_target:,action action:selector,forcontrolevents controlEvents:UIControlEvents)
image.png
self.btn.isEnabled=true self.btn.isHighlighted=true self.btn2.contentVerticalAlignment = .top self.btn2.contentHorizontalAlignment = .center
@IBAction func touchupInsideBtnAction(sender:AnyObject, forEvent event:UIEvent) { print(“按下的按钮是 Button”) btn.sendAction(#selector(ViewController.helloWorld),to:self, forEvent:nil) } func helloWorld(){ print(“helloWorld”) }