ios - 旋转 UIView 下的 UILabel

Question

我正在尝试旋转位于(在 Storyboard 上创建的)UIView 下的 UILabel，但当我尝试 CGAffineTransform(rotationAngle: ) 时，它会因零值而导致应用程序崩溃。这是因为我使用 Storyboard造成的吗？

    @IBDesignable
    class AnalogView: UIView {

        @IBOutlet var prevPitch:UILabel!
        @IBOutlet var currectPitch:UILabel!
        @IBOutlet var nextPitch:UILabel!

        fileprivate let thickHorizontalLayer = CAShapeLayer()
        fileprivate let thinHorizontalLayer = CAShapeLayer()

        fileprivate let roundThinLayer = CAShapeLayer(layer: self)
        fileprivate let roundThickLayer = CAShapeLayer(layer: self)

        @IBInspectable var thickYCoord: CGFloat = 50.0
        @IBInspectable var thinYCoord: CGFloat = 52.5



        @IBInspectable var counterColor: UIColor = UIColor.orange

        override init(frame: CGRect = .zero) {
            super.init(frame: frame)



            configure()
        }

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

        }

        private func configure() {


            prevPitch.transform = CGAffineTransform(rotationAngle: 3.14)

Answer 1

您的标签prevPitch未连接到您的 Storyboard项目

您的代码左侧边栏上有一个加号而不是圆圈。

您应该重新连接它。也许您在重命名时丢失了此连接