swift - 是否可以使用 Swift 旋转 IBDesignable UIButton？

Question

如何制作具有角度的 IBDesignable 组件:旋转 View 的 CGFloat 属性

import UIKit

@IBDesignable
class MyB: UIButton {
    @IBInspectable
    var angle: CGFloat = 0 {
        didSet {
            //What to put here?
        }
    }

    override init(frame: CGRect) {
        super.init(frame: frame)
        // Initialization code
    }

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

我试过了

self.transform = CGAffineTransformMakeRotation(angle)

但是没用

Answer 1

您应该创建继承自 UIButton 的 CustomButton

import UIKit

@IBDesignable
class CustomButton: UIButton {

    @IBInspectable var rotation: Double = 0 {
        didSet {
            rotateButton(rotation: rotation)
        }
    }

    func rotateButton(rotation: Double)  {
        self.transform = CGAffineTransform(rotationAngle: CGFloat(.pi/2 + rotation))
    }
}

你会得到如下输出，