Swift 中的 UIBezierPath:路径非常奇怪地关闭 [英] UIBezierPath in Swift: Path gets closed very weirdly

问题描述

我正在使用

实际的样子:

我的代码:

override func drawRect(rect: CGRect) {让点:[CGPoint] = [CGPoint(x: 78, y: 99), CGPoint(x: 78, y: 128), CGPoint(x: 78, y: 173), CGPoint(x: 84, y: 199)), CGPoint(x: 95, y: 223), CGPoint(x: 112, y: 240), CGPoint(x: 136, y: 243), CGPoint(x: 170, y: 236), CGPoint(x:203, y: 217), CGPoint(x: 227, y: 190), CGPoint(x: 240, y: 160), CGPoint(x: 241, y: 134), CGPoint(x: 241, y: 108), CGPoint(x: 240, y: 93), CGPoint(x: 239, y: 84), CGPoint(x: 237, y: 75), CGPoint(x: 78, y: 99), CGPoint(x: 78), y: 128), CGPoint(x: 78, y: 173), CGPoint(x: 84, y: 199), CGPoint(x: 95, y: 223), CGPoint(x: 112, y: 240),CGPoint(x: 136, y: 243), CGPoint(x: 170, y: 236), CGPoint(x: 203, y: 217), CGPoint(x: 227, y: 190), CGPoint(x: 240,y: 160), CGPoint(x: 241, y: 134), CGPoint(x: 241, y: 108), CGPoint(x: 240, y: 93), CGPoint(x: 239, y: 84), CGPoint(x: 237, y: 75), CGPoint(x: 78, y: 99), CGPoint(x: 78, y: 128), CGPoint(x: 78, y: 173), CGPoint(x: 84, y: 199), CGPoint(x: 95, y: 223), CGPoint(x: 112, y: 240), CGPoint(x: 136, y: 243), CGPoint(x: 170, y: 236),CGPoint(x: 203, y: 217), CGPoint(x: 227, y: 190), CGPoint(x: 240, y: 160), CGPoint(x: 241, y: 134), CGPoint(x: 241,y: 108), CGPoint(x: 240, y: 93), CGPoint(x: 239, y: 84), CGPoint(x: 237, y: 75)]让路径 = UIBezierPath(hermiteInterpolatedPoints: 点, 关闭: false)如果让路径=路径{UIColor.blueColor().set()路径.线宽 = 5.0path.stroke()}}

当数组缩短为:

让点数:[CGPoint] = [CGPoint(x: 78, y: 99), CGPoint(x: 78, y: 128), CGPoint(x: 78, y: 173), CGPoint(x: 84, y: 199), CGPoint(x: 95, y: 223), CGPoint(x: 112, y: 240), CGPoint(x: 136, y: 243), CGPoint(x: 170, y: 236), CGPoint(x: 203, y: 217), CGPoint(x: 227, y: 190), CGPoint(x: 240, y: 160), CGPoint(x: 241, y: 134), CGPoint(x:241, y: 108)]

看起来像这样:

解决方案

您的点数组是相同的 16 个点重复 3 次.

让分:[CGPoint] = [CGPoint(x: 78, y: 99), CGPoint(x: 78, y: 128), CGPoint(x: 78, y: 173), CGPoint(x: 84, y: 199), CGPoint(x: 95,y: 223), CGPoint(x: 112, y: 240), CGPoint(x: 136, y: 243), CGPoint(x: 170, y: 236), CGPoint(x: 203, y: 217), CGPoint(x: 227, y: 190), CGPoint(x: 240, y: 160), CGPoint(x: 241, y: 134), CGPoint(x: 241, y: 108), CGPoint(x: 240, y: 93), CGPoint(x: 239, y: 84), CGPoint(x: 237, y: 75),CGPoint(x: 78, y: 99), CGPoint(x: 78, y: 128), CGPoint(x: 78, y: 173), CGPoint(x: 84, y: 199), CGPoint(x: 95,y: 223), CGPoint(x: 112, y: 240), CGPoint(x: 136, y: 243), CGPoint(x: 170, y: 236), CGPoint(x: 203, y: 217), CGPoint(x: 227, y: 190), CGPoint(x: 240, y: 160), CGPoint(x: 241, y: 134), CGPoint(x: 241, y: 108), CGPoint(x: 240, y: 93), CGPoint(x: 239, y: 84), CGPoint(x: 237, y: 75),CGPoint(x: 78, y: 99), CGPoint(x: 78, y: 128), CGPoint(x: 78, y: 173), CGPoint(x: 84, y: 199), CGPoint(x: 95,y: 223), CGPoint(x: 112, y: 240), CGPoint(x: 136, y: 243), CGPoint(x: 170, y: 236), CGPoint(x: 203, y: 217), CGPoint(x: 227, y: 190), CGPoint(x: 240, y: 160), CGPoint(x: 241, y: 134), CGPoint(x: 241, y: 108), CGPoint(x: 240, y: 93), CGPoint(x: 239, y: 84), CGPoint(x: 237, y: 75)]

你从最后一个点跳，CGPoint(x: 237, y: 75)，回到起点，CGPoint(x: 78, y: 99)，(而且你这样做了两次)正在关闭路径.

对于重复相同点序列三次的数组，路径是正确的.

I am using the extension from Drawing class drawing straight lines instead of curved lines to interpolate a u-shape drawing. Unfortunately the path gets closed in a weird way:

What it should look like:

What it actually looks like:

My code:

override func drawRect(rect: CGRect) {
    let points: [CGPoint] = [CGPoint(x: 78, y: 99), CGPoint(x: 78, y: 128), CGPoint(x: 78, y: 173), CGPoint(x: 84, y: 199), CGPoint(x: 95, y: 223), CGPoint(x: 112, y: 240), CGPoint(x: 136, y: 243), CGPoint(x: 170, y: 236), CGPoint(x: 203, y: 217), CGPoint(x: 227, y: 190), CGPoint(x: 240, y: 160), CGPoint(x: 241, y: 134), CGPoint(x: 241, y: 108), CGPoint(x: 240, y: 93), CGPoint(x: 239, y: 84), CGPoint(x: 237, y: 75), CGPoint(x: 78, y: 99), CGPoint(x: 78, y: 128), CGPoint(x: 78, y: 173), CGPoint(x: 84, y: 199), CGPoint(x: 95, y: 223), CGPoint(x: 112, y: 240), CGPoint(x: 136, y: 243), CGPoint(x: 170, y: 236), CGPoint(x: 203, y: 217), CGPoint(x: 227, y: 190), CGPoint(x: 240, y: 160), CGPoint(x: 241, y: 134), CGPoint(x: 241, y: 108), CGPoint(x: 240, y: 93), CGPoint(x: 239, y: 84), CGPoint(x: 237, y: 75), CGPoint(x: 78, y: 99), CGPoint(x: 78, y: 128), CGPoint(x: 78, y: 173), CGPoint(x: 84, y: 199), CGPoint(x: 95, y: 223), CGPoint(x: 112, y: 240), CGPoint(x: 136, y: 243), CGPoint(x: 170, y: 236), CGPoint(x: 203, y: 217), CGPoint(x: 227, y: 190), CGPoint(x: 240, y: 160), CGPoint(x: 241, y: 134), CGPoint(x: 241, y: 108), CGPoint(x: 240, y: 93), CGPoint(x: 239, y: 84), CGPoint(x: 237, y: 75)]

    let path = UIBezierPath(hermiteInterpolatedPoints: points, closed: false)

    if let path = path {
        UIColor.blueColor().set()
        path.lineWidth = 5.0
        path.stroke()
    } 
}

When the array is shortened to:

let points: [CGPoint] = [CGPoint(x: 78, y: 99), CGPoint(x: 78, y: 128), CGPoint(x: 78, y: 173), CGPoint(x: 84, y: 199), CGPoint(x: 95, y: 223), CGPoint(x: 112, y: 240), CGPoint(x: 136, y: 243), CGPoint(x: 170, y: 236), CGPoint(x: 203, y: 217), CGPoint(x: 227, y: 190), CGPoint(x: 240, y: 160), CGPoint(x: 241, y: 134), CGPoint(x: 241, y: 108)]

It looks like this:

解决方案

Your array of points is the same 16 points repeated three times.

let points: [CGPoint] = [
    CGPoint(x: 78, y: 99), CGPoint(x: 78, y: 128), CGPoint(x: 78, y: 173), CGPoint(x: 84, y: 199), CGPoint(x: 95, y: 223), CGPoint(x: 112, y: 240), CGPoint(x: 136, y: 243), CGPoint(x: 170, y: 236), CGPoint(x: 203, y: 217), CGPoint(x: 227, y: 190), CGPoint(x: 240, y: 160), CGPoint(x: 241, y: 134), CGPoint(x: 241, y: 108), CGPoint(x: 240, y: 93), CGPoint(x: 239, y: 84), CGPoint(x: 237, y: 75),
    CGPoint(x: 78, y: 99), CGPoint(x: 78, y: 128), CGPoint(x: 78, y: 173), CGPoint(x: 84, y: 199), CGPoint(x: 95, y: 223), CGPoint(x: 112, y: 240), CGPoint(x: 136, y: 243), CGPoint(x: 170, y: 236), CGPoint(x: 203, y: 217), CGPoint(x: 227, y: 190), CGPoint(x: 240, y: 160), CGPoint(x: 241, y: 134), CGPoint(x: 241, y: 108), CGPoint(x: 240, y: 93), CGPoint(x: 239, y: 84), CGPoint(x: 237, y: 75),
    CGPoint(x: 78, y: 99), CGPoint(x: 78, y: 128), CGPoint(x: 78, y: 173), CGPoint(x: 84, y: 199), CGPoint(x: 95, y: 223), CGPoint(x: 112, y: 240), CGPoint(x: 136, y: 243), CGPoint(x: 170, y: 236), CGPoint(x: 203, y: 217), CGPoint(x: 227, y: 190), CGPoint(x: 240, y: 160), CGPoint(x: 241, y: 134), CGPoint(x: 241, y: 108), CGPoint(x: 240, y: 93), CGPoint(x: 239, y: 84), CGPoint(x: 237, y: 75)
]

You jump from the last point, CGPoint(x: 237, y: 75), back to the start point, CGPoint(x: 78, y: 99), (and you're doing that twice) which is closing the path.

The path is correct for that array which repeats the same sequence of points three times.

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