Ios 我怎样才能在故事板中看到这幅画？

我画了一个三角形，但在故事板上看不见。我怎样才能在故事板上看到这幅画

视图控制器代码：

class ViewController: UIViewController {

    @IBOutlet weak var fooView: UIView!

    var polygonShape = CAShapeLayer()

    override func viewDidLoad() {
        super.viewDidLoad()

        let polygonPath = UIBezierPath()
        polygonPath.move(to: CGPoint(x: 50, y: -1))
        polygonPath.addLine(to: CGPoint(x: 93.3, y: 74))
        polygonPath.addLine(to: CGPoint(x: 6.7, y: 74))
        polygonPath.close()

        polygonShape.frame = fooView.bounds
        polygonShape.path = polygonPath.cgPath

        fooView.layer.mask = polygonShape

    }
}

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将您的类更改为：

@IBDesignable
class FirstImageView: UIView {

    var polygonShape: CAShapeLayer!

    override init(frame: CGRect) {
        super.init(frame: frame)
        commonInit()
    }

    required init?(coder: NSCoder) {
        super.init(coder: coder)
        commonInit()
    }

    func commonInit() -> Void {

        if polygonShape == nil {
            polygonShape = CAShapeLayer()
            layer.mask = polygonShape
        }

    }

    override func layoutSubviews() {
        super.layoutSubviews()

        let polygonPath = UIBezierPath()
        polygonPath.move(to: CGPoint(x: 0.0, y: bounds.size.height))
        polygonPath.addLine(to: CGPoint(x: bounds.width * 0.5, y: 0.0))
        polygonPath.addLine(to: CGPoint(x: bounds.size.width, y: bounds.size.height))
        polygonPath.close()

        polygonShape.path = polygonPath.cgPath
    }

}

可以从ViewController类中删除所有内容。在这一点上，你甚至根本不需要这个类

选择故事板上的视图，并在Identity Inspector窗格顶部将自定义类从默认UIView更改为FirstImageView

在顶部编辑器菜单下，选择“刷新所有视图”或确保选中“自动刷新视图”

结果:

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你想要一个指向上的三角形吗？是的，先生。我想看故事板上的图画