IOS 操作控件

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)

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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”) }