阴影路径无法使用UIButton

我正在创建一个如下按钮：

let authorizationButton = UIButton()
    let authorizationButtonHeight = 50.0
    let authorizationButtonX = 10.0
    let authorizationButtonWidth = UIScreen.mainScreen().bounds.size.width - authorizationButtonX * 2
    let authorizationButtonY = UIScreen.mainScreen().bounds.size.height - 10.0 - authorizationButtonHeight

    authorizationButton.frame = CGRectMake(authorizationButtonX, authorizationButtonY, authorizationButtonWidth, authorizationButtonHeight)

        authorizationButton.layer.shadowPath = UIBezierPath(rect:CGRectMake(authorizationButton.frame.origin.x, authorizationButton.frame.origin.y,
        authorizationButton.frame.size.width, authorizationButton.frame.size.height)).CGPath

    authorizationButton.layer.shadowColor = UIColor.blackColor().CGColor
    authorizationButton.layer.shadowOpacity = 1.0
    authorizationButton.layer.shadowRadius = 3.0
    authorizationButton.layer.shadowOffset = CGSizeMake(3.0, 3.0)

之后，我尝试使用自己的阴影路径添加阴影，如下所示：

let authorizationButton = UIButton()
    let authorizationButtonHeight = 50.0
    let authorizationButtonX = 10.0
    let authorizationButtonWidth = UIScreen.mainScreen().bounds.size.width - authorizationButtonX * 2
    let authorizationButtonY = UIScreen.mainScreen().bounds.size.height - 10.0 - authorizationButtonHeight

    authorizationButton.frame = CGRectMake(authorizationButtonX, authorizationButtonY, authorizationButtonWidth, authorizationButtonHeight)

        authorizationButton.layer.shadowPath = UIBezierPath(rect:CGRectMake(authorizationButton.frame.origin.x, authorizationButton.frame.origin.y,
        authorizationButton.frame.size.width, authorizationButton.frame.size.height)).CGPath

    authorizationButton.layer.shadowColor = UIColor.blackColor().CGColor
    authorizationButton.layer.shadowOpacity = 1.0
    authorizationButton.layer.shadowRadius = 3.0
    authorizationButton.layer.shadowOffset = CGSizeMake(3.0, 3.0)

我的真实阴影路径要复杂得多

根本不显示阴影

---

可能是什么问题？

问题与贝塞尔路径有关：原点应为0,0

更改代码如下：

authorizationButton.layer.shadowPath = UIBezierPath(rect:
    CGRectMake(0, 
               0, 
               authorizationButton.frame.size.width,
               authorizationButton.frame.size.height)).CGPath

---

我知道这已经晚了，但对于仍然偶然发现这个问题的人，请将阴影代码移动到一个扩展，并在viewDidLayoutSubviews或viewWillLayoutSubviews中调用它，因为阴影路径需要计算视图的边界或帧

例如：

---

覆盖func viewDidLayoutSubviews（）{super.viewDidLayoutSubviews（）myButton.applyShadows（）}

是否尝试将clipToBounds设置为false？另外，可能您必须使用origin（0,0）@mxb，doh来实例化贝塞尔路径。。。你说得对，原点应该是（0,0）。把你的评论作为回答，我会接受的。谢谢：）通常情况下，您在此处创建的rect与

authorizationButton.bounds

相同。非常感谢

CGRect（原点：CGPoint.zero，大小：frame.size）

和

bounds

两者都工作正常：）