如何在Swift中创建一个圆形按钮？

Question

我想做一个圆形竖起大拇指和拇指向下的按钮。

我应该使用ImageView还是Button作为超类？

我该如何在Swift中做到这一点？

Answer 1

下面是一个例子圆形按钮：

斯威夫特3：

override func viewDidLoad() { 
    super.viewDidLoad() 

    let button = UIButton(type: .custom) 
    button.frame = CGRect(x: 160, y: 100, width: 50, height: 50) 
    button.layer.cornerRadius = 0.5 * button.bounds.size.width 
    button.clipsToBounds = true 
    button.setImage(UIImage(named:"thumbsUp.png"), for: .normal) 
    button.addTarget(self, action: #selector(thumbsUpButtonPressed), for: .touchUpInside) 
    view.addSubview(button) 
} 

func thumbsUpButtonPressed() { 
    print("thumbs up button pressed") 
} 

斯威夫特2.X：

override func viewDidLoad() { 
    super.viewDidLoad() 

    let button = UIButton(type: .Custom) 
    button.frame = CGRect(x: 160, y: 100, width: 50, height: 50) 
    button.layer.cornerRadius = 0.5 * button.bounds.size.width 
    button.clipsToBounds = true 
    button.setImage(UIImage(named:"thumbsUp.png"), forState: .Normal) 
    button.addTarget(self, action: #selector(thumbsUpButtonPressed), forControlEvents: .TouchUpInside) 
    view.addSubview(button) 
} 

func thumbsUpButtonPressed() { 
    print("thumbs up button pressed") 
}