uibutton - shadowPath 不适用于 UIButton

Question

我正在创建一个这样的按钮:

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)

之后，我尝试使用我自己的 shadowPath 添加阴影，如下所示:

        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)

我真正的阴影路径要复杂得多。

阴影根本不显示。

可能是什么问题？

Answer 1

问题与贝塞尔曲线路径有关:原点应为 0,0。

按如下方式更改您的代码:

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