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UIBezierPath in Swift: the path closes very weird

I use the extension from drawing the straight line drawing class instead of curved lines to interpolate the u-shape pattern. Unfortunately, the path closes in a strange way:

What it should look like:

What does he want

What it actually looks like:

what does it look like

My code is:

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 shrinks 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:

enter image description here

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1 answer

Your point array is the same 16 points that are 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 go from the last point, CGPoint(x: 237, y: 75) , back to the starting point, CGPoint(x: 78, y: 99) , (and you do this twice), which closes the path.

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

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