我已经在所有模拟器上测试了以下代码，除了在iPad Pro上，它运行良好。在iPad Pro上是不显示的。渐变层会很好地工作，只有当我尝试应用掩码时，它才会不会出现在iPad Pro模拟器上：
func createOverlay()
{
if !(gradientLayer != nil)
{
self.gradientLayer = CAGradientLayer()
self.layer.addSublayer(gradientLayer)
}
gradientLayer.frame = self.bounds
print(gradientLayer.frame)
gradientLayer.colors = [appColour.CGColor, appColourDark.CGColor]
//--------FROM HERE ON DOES NOT WORK ON IPAD PRO, NO CRASH BUT LAYER DOES NOT APPEAR
self.alpha = maskAlpha
let maskLayer = CAShapeLayer()
let path = CGPathCreateMutable()
let rect: CGRect = CGRect(x: xOffset - offset, y: yOffset - offset, width: circleWidth + (offset * 2), height: circleHeight + (offset * 2))
let bPath = UIBezierPath(ovalInRect: rect)
CGPathAddRect(path, nil, CGRectMake(0, 0, self.frame.width, self.frame.height))
CGPathAddPath(path, nil, bPath.CGPath)
maskLayer.backgroundColor = UIColor.blackColor().CGColor
maskLayer.path = path
maskLayer.fillRule = kCAFillRuleEvenOdd
self.layer.mask = maskLayer
self.clipsToBounds = true
}
我希望这只是一个模拟器问题，但如果你在我的代码中看到一些可能导致问题的东西，请告诉我。
我尝试用普通层替换渐变层，但它仍然无法显示。
这是完整的代码，它是UIView的一个自定义子类，是IB:中视图控制器设置的顶层
import UIKit
protocol TipSpeechDelegate
{
func stopSpeaking()
}
@IBDesignable
class HoleMaskView: UIView
{
var xOffset : CGFloat = 0.0
var yOffset : CGFloat = 0.0
var circleWidth: CGFloat = 0.0
var circleHeight: CGFloat = 0.0
var maskAlpha: CGFloat = 0.9
var offset: CGFloat = 10.0
var inset: CGFloat = 8.0
var tipText: String = ""
var myLabel: UILabel?
var gradientLayer: CAGradientLayer!
var relativeCorner: RelativeCornerType = RelativeCornerType.upperLeftCorner
var delegate: TipSpeechDelegate!
override func layoutSubviews()
{
super.layoutSubviews()
}
override func drawRect(rect: CGRect)
{
let gestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(HoleMaskView.handleTap(_:)))
self.addGestureRecognizer(gestureRecognizer)
}
func drawTipText()
{
createOverlay()
let height: CGFloat = self.frame.size.height
if (self.myLabel != nil)
{
myLabel?.removeFromSuperview()
}
if (yOffset < height/2)
{
self.myLabel = UILabel(frame: CGRect(x: inset, y: (yOffset + circleHeight), width: self.frame.width-(inset*2), height: self.frame.height-(yOffset + circleHeight)))
}
else
{
self.myLabel = UILabel(frame: CGRect(x: inset, y: 0, width: self.frame.width-(inset*2), height: yOffset))
}
self.myLabel?.text = tipText
self.myLabel?.textColor = UIColor.whiteColor()
self.myLabel?.font = UIFont(name: "Avenir-Medium", size: 20.0)
self.myLabel?.textAlignment = .Center
self.myLabel?.lineBreakMode = .ByWordWrapping
self.myLabel?.numberOfLines = 0
self.myLabel?.setNeedsLayout()
self.addSubview(myLabel!)
}
func updateTipText(text: String, circle: CGRect)
{
self.tipText = text
yOffset = circle.origin.y
xOffset = circle.origin.x
circleWidth = circle.size.width
circleHeight = circle.size.height
self.drawTipText()
}
func tipText(text: String, rFrame: CGRect, inView: UIView) -> Bool
{
showTipMask()
let convertedPoint = inView.convertPoint(rFrame.origin, toView: self)
self.tipText = text
yOffset = convertedPoint.y
xOffset = convertedPoint.x
circleWidth = rFrame.size.width
circleHeight = rFrame.size.height
self.drawTipText()
return true
}
func tipText(text: String, button: UIButton) -> Bool
{
if button.hidden
{
return false
}
showTipMask()
let convertedPoint = button.superview!.convertPoint(button.frame.origin, toView: self)
self.tipText = text
yOffset = convertedPoint.y
xOffset = convertedPoint.x
circleWidth = button.frame.size.width
circleHeight = button.frame.size.height
self.drawTipText()
return true
}
func tipText(text: String, label: UILabel) -> Bool
{
if label.hidden
{
return false
}
showTipMask()
let convertedPoint = label.superview!.convertPoint(label.frame.origin, toView: self)
self.tipText = text
yOffset = convertedPoint.y
xOffset = convertedPoint.x
circleWidth = label.frame.size.width
circleHeight = label.frame.size.height
self.drawTipText()
return true
}
func tipText(text: String, textView: UITextView) -> Bool
{
if textView.hidden
{
return false
}
showTipMask()
let convertedPoint = textView.superview!.convertPoint(textView.frame.origin, toView: self)
self.tipText = text
yOffset = convertedPoint.y
xOffset = convertedPoint.x
circleWidth = textView.frame.size.width
circleHeight = textView.frame.size.height
self.drawTipText()
return true
}
func tipText(text: String) -> Bool
{
showTipMask()
self.tipText = text
yOffset = 0.0
xOffset = self.frame.size.width/2
circleWidth = 0.0
circleHeight = 0.0
self.drawTipText()
return true
}
func tipText(text: String, view: UIView) -> Bool
{
if view.hidden
{
return false
}
showTipMask()
let convertedPoint = view.superview!.convertPoint(view.frame.origin, toView: self)
self.tipText = text
yOffset = convertedPoint.y
xOffset = convertedPoint.x
circleWidth = view.frame.size.width
circleHeight = view.frame.size.height
self.drawTipText()
return true
}
func tipText(text: String, stepper: UIStepper) -> Bool
{
if stepper.hidden
{
return false
}
showTipMask()
let convertedPoint = stepper.superview!.convertPoint(stepper.frame.origin, toView: self)
self.tipText = text
yOffset = convertedPoint.y
xOffset = convertedPoint.x
circleWidth = stepper.frame.size.width
circleHeight = stepper.frame.size.height
self.drawTipText()
return true
}
func showTipMask()
{
self.alpha = alphaHide
self.hidden = false
UIView.animateWithDuration(0.5, animations:
{
self.alpha = alphaShow
}
)
}
func handleTap(gestureRecognizer: UIGestureRecognizer)
{
if delegate != nil
{
delegate.stopSpeaking()
}
print("tapped internal")
UIView.animateWithDuration(0.25, delay: 0.0, options: UIViewAnimationOptions.TransitionNone, animations:
{
() -> Void in
self.alpha = alphaHide
},
completion:
{
(finished: Bool) -> Void in
self.hidden = true
}
)
}
func createOverlay()
{
if !(gradientLayer != nil)
{
self.gradientLayer = CAGradientLayer()
self.layer.addSublayer(gradientLayer)
}
gradientLayer.frame = self.bounds
print(gradientLayer.frame)
gradientLayer.colors = [appColour.CGColor, appColourDark.CGColor]
self.alpha = maskAlpha
let maskLayer = CAShapeLayer()
let path = CGPathCreateMutable()
let rect: CGRect = CGRect(x: xOffset - offset, y: yOffset - offset, width: circleWidth + (offset * 2), height: circleHeight + (offset * 2))
let bPath = UIBezierPath(ovalInRect: rect)
CGPathAddRect(path, nil, CGRectMake(0, 0, self.frame.width, self.frame.height))
CGPathAddPath(path, nil, bPath.CGPath)
maskLayer.backgroundColor = UIColor.blackColor().CGColor
maskLayer.path = path
maskLayer.fillRule = kCAFillRuleEvenOdd
self.layer.mask = maskLayer
self.clipsToBounds = true
}
}
感谢
Greg
我也面临同样的问题。当前I
- 打开调试->优化窗口比例渲染
- 缩小到50%
则图形显示正确。
但我的一所大学告诉我，他必须关闭ORWS选项。有线。