我目前面临一个问题,即旋转CATextLayer时,帧大小将同时意外地转换。我希望文本可以旋转一定角度而无需更改其框架大小。如果有人可以启发我,请先谢谢。
我尝试过的事情:
var someAngle: CGFloat = 0 {
didSet {
drawText()
}
}
func drawText() {
for layer in someView.layer.sublayers ?? [] where layer is CATextLayer {
layer.removeFromSuperlayer()
}
let textLayer = CATextLayer()
textLayer.fontSize = 26
textLayer.backgroundColor = UIColor.lightGray.cgColor
textLayer.string = "Hello world"
textLayer.alignmentMode = .center
textLayer.anchorPoint = CGPoint(x: 0.5,y: 0.5)
textLayer.transform = CATransform3DMakeRotation(someAngle,0.0,1.0)
let textSize = calculateTextSize(text: "Hello world",font: UIFont.systemFont(ofSize: 26))
let origin = CGPoint(x: someView.bounds.midX - textSize.width/2,y: someView.bounds.midY - textSize.height/2)
textLayer.frame = CGRect(origin: origin,size: textSize)
someView.layer.addSublayer(textLayer)
}
但是,结果看起来像这样: