Question

我正在创建UIButton（从CGPath中提取），其初始化为CGRect帧，但不会缩放到其视图的大小。

相反，我正在尝试扩展路径，但Xcode似乎对我正在做的事情不太满意。

class MenuButton : UIButton {
    let shortStrokeOrig: CGPath = {
        let path = CGPathCreateMutable()
        CGPathMoveToPoint(path, nil, 2, 2)
        CGPathAddLineToPoint(path, nil, 28, 2)

        return path
    }()

    let outlineOrig: CGPath = {
        let path = CGPathCreateMutable()
        CGPathMoveToPoint(path, nil, 10, 27)
        // Blah blah more curves....
        CGPathAddCurveToPoint(path, nil, 13.16,  2.00,  2.00, 13.16,  2, 27)

        return path
    }()

    let shortStroke: CGPath = CGPathCreateCopyByTransformingPath(shortStrokeOrig, CGAffineTransformMakeScale(0.5, 0.5))
    let outline: CGPath = CGPathCreateCopyByTransformingPath(outlineOrig, CGAffineTransformMakeScale(0.5, 0.5))
}

这会导致错误MenuButton.Type does not have a member named shortStrokeOrig和outlineOrig相同。

不确定为什么抱怨。或者，如果有人对如何扩展我的路径有任何更好的建议..

Answer 1

问题出在shortStroke常量初始化 - CGPathCreateCopyByTransformingPath(shortStrokeOrig, CGAffineTransformMakeScale(0.5, 0.5))

问题：

shortStrokeOrig - 被声明为实例变量，但您将其用作类变量。
CGPathCreateCopyByTransformingPath函数的第二个参数类型为UnsafePointer<CGAffineTransform>而不是CGAffineTransform。

解决方案

将shortStrokeOrig和outlineOrig设为类变量
传递CGAffineTransform作为参考（创建变量并在将其传递给函数时使用＆amp;）

代码：

class MenuButton : UIButton {
    static let shortStrokeOrig: CGPath = {
        let path = CGPathCreateMutable()
        CGPathMoveToPoint(path, nil, 2, 2)
        CGPathAddLineToPoint(path, nil, 28, 2)

        return path
        }()

    static let outlineOrig: CGPath = {
        let path = CGPathCreateMutable()
        CGPathMoveToPoint(path, nil, 10, 27)
        // Blah blah more curves....
        CGPathAddCurveToPoint(path, nil, 13.16,  2.00,  2.00, 13.16,  2, 27)

        return path
        }()

    static var transform = CGAffineTransformMakeScale(0.5, 0.5)
    let shortStroke: CGPath! =  CGPathCreateCopyByTransformingPath(MenuButton.shortStrokeOrig, &transform)
    let outline: CGPath = CGPathCreateCopyByTransformingPath(outlineOrig, &transform)
}

缩放CGPath＆amp; Class.Type没有名为nameHere的成员

1 个答案: