caGradientLayer帧显示不正确

我有下面的代码来显示一个 cagradientlayer ,它应该覆盖整个视图。但是,它在模拟器中显示不正确。我打印了 self.view.bounds.width 和 self.view.bounds.height which打印了正确的值。下面是模拟器屏幕截图。

向日历视图添加背景层 让渐变层=caGradientLayer()) gradientlayer.bounds=cgrect(x:0,y:0,width:self.view.bounds.width,height:self.view.bounds.height) gradientlayer.colors=[lightdarkcolor.cgcolor,darkcolor.cgcolor,lightdarkcolor.cgcolor] gradientlayer.startpoint=cgpoint(x:0.0,y:0.0) gradientlayer.endpoint=cgpoint(x:1.0,y:1.0) self.view.layer.insertSublayer(渐变层,位于:0) < /代码>

. self.view.bounds.width 和 self.view.bounds.height 打印正确的值。下面是模拟器屏幕截图。

// Add background layer to calendar view
    let gradientLayer = CAGradientLayer()
    gradientLayer.bounds = CGRect(x: 0, y: 0, width: self.view.bounds.width, height: self.view.bounds.height)
    gradientLayer.colors = [lightDarkColor.cgColor, darkColor.cgColor, lightDarkColor.cgColor]
    gradientLayer.startPoint = CGPoint(x: 0.0, y: 0.0)
    gradientLayer.endPoint = CGPoint(x: 1.0, y: 1.0)
    self.view.layer.insertSublayer(gradientLayer, at: 0)