我有一個UIBezierPath，我需要從中獲取要點列表。在Qt其中，有一個函數(shù)pointAtPercent可以滿足我的需求，但找不到等效的函數(shù)Objective-C。有誰知道如何做到這一點？
3 回答
阿晨1998
TA貢獻2037條經(jīng)驗 獲得超6個贊
為了找到一個像雨燕解決方案，我在這整個的做法strumbled 后實施了CGPath擴展像這樣得到的路徑點：
extension CGPath {
func points() -> [CGPoint]
{
var bezierPoints = [CGPoint]()
self.forEach({ (element: CGPathElement) in
let numberOfPoints: Int = {
switch element.type {
case .MoveToPoint, .AddLineToPoint: // contains 1 point
return 1
case .AddQuadCurveToPoint: // contains 2 points
return 2
case .AddCurveToPoint: // contains 3 points
return 3
case .CloseSubpath:
return 0
}
}()
for index in 0..<numberOfPoints {
let point = element.points[index]
bezierPoints.append(point)
}
})
return bezierPoints
}
func forEach(@noescape body: @convention(block) (CGPathElement) -> Void) {
typealias Body = @convention(block) (CGPathElement) -> Void
func callback(info: UnsafeMutablePointer<Void>, element: UnsafePointer<CGPathElement>) {
let body = unsafeBitCast(info, Body.self)
body(element.memory)
}
let unsafeBody = unsafeBitCast(body, UnsafeMutablePointer<Void>.self)
CGPathApply(self, unsafeBody, callback)
}
}
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