问题描述
下面有一个循环,用于检测UIView
数组中的视图是否完全重叠。如果是这样,则调整其center
值。
每个视图都是25x25。
func drawCircles() {
for i in 0..<circles.count{
circles[i].center = getRandomPoint()
for j in 0..<circles.count{
if(i != j) {
let comparingCentre = circles[j].center
let dist = distance(comparingCentre,circles[i].center)
if dist <= 25 {
var newCenter = circles[i].center
var centersvector = CGVector(dx: newCenter.x - comparingCentre.x,dy: newCenter.y - comparingCentre.y)
//Circle width is 25
centersvector.dx *= 26 / dist
centersvector.dy *= 26 / dist
newCenter.x = comparingCentre.x + centersvector.dx
newCenter.y = comparingCentre.y + centersvector.dy
circles[i].center = newCenter
}
}
}
}
...
}
以下是用于生成随机CGPoint
并将其设置为视图中心的方法:
func getRandomPoint() -> CGPoint {
let viewMidX = self.circlesView.bounds.midX
let viewMidY = self.circlesView.bounds.midY
let xPosition = self.circlesView.frame.midX - viewMidX + CGFloat(arc4random_uniform(UInt32(viewMidX*2)))
let yPosition = self.circlesView.frame.midY - viewMidY + CGFloat(arc4random_uniform(UInt32(viewMidY*2)))
let point = CGPoint(x: xPosition,y: yPosition)
return point
}
func distance(_ a: CGPoint,_ b: CGPoint) -> CGFloat {
let xdist = a.x - b.x
let ydist = a.y - b.y
return CGFloat(hypot(xdist,ydist))
}
但是,有时我仍然会遇到两个视图相互重叠的情况(请参见下面的红色圆圈部分):
func generateCircles() {
numberOfCircles = Int.random(in: 1..<50)
let circleWidth = CGFloat(25)
let circleHeight = circleWidth
var i = 0
while i < numberOfCircles {
let circleView = CircleView(frame: CGRect(x: 0.0,y: 0.0,width: circleWidth,height: circleHeight))
let number = Int.random(in: 0..<2)
if number == 1 {
circleView.mainColor = .yellow
} else {
circleView.mainColor = .blue
}
circles.append(circleView)
i += 1
}
drawCircles()
}
解决方法
根据我上面的评论,这是一个快速的选择,它涉及将用于比较距离的逻辑转换为随机点的创建: 可以清除此错误,但我不想完全重写它,而要使用尽可能多的代码。
在generateCirles
函数中,我仅更改了如何初始化CircleView
func generateCircles() {
numberOfCircles = Int.random(in: 1..<50)
let circleWidth = CGFloat(25)
let circleHeight = circleWidth
for _ in 0..<numberOfCircles {
let circleView = CircleView(frame: CGRect(origin: getRandomPoint(),size: (CGSize(width: circleWidth,height: circleHeight))))
let number = Int.random(in: 0..<2)
if number == 1 {
circleView.mainColor = .yellow
} else {
circleView.mainColor = .blue
}
circles.append(circleView)
}
drawCircles()
}
在getRandomPoint
中,我根据您现有的距离逻辑添加了一个检查,以查看新点是否为有效点:
func getRandomPoint() -> CGPoint {
let viewMidX = self.circlesView.bounds.midX
let viewMidY = self.circlesView.bounds.midY
let xPosition = self.circlesView.frame.midX - viewMidX + CGFloat(arc4random_uniform(UInt32(viewMidX*2)))
let yPosition = self.circlesView.frame.midY - viewMidY + CGFloat(arc4random_uniform(UInt32(viewMidY*2)))
let point = CGPoint(x: xPosition,y: yPosition)
if !validatePoint(point) {
return getRandomPoint()
}
return point
}
func validatePoint(_ point: CGPoint) -> Bool {
for circle in circles {
if distance(circle.frame.origin,point) <= 25 {
return false
}
}
return true
}
我从您发布的drawCircles
中删除了所有代码。
这是300个圆的外观:(我使用视框作为circleView框,所以这就是为什么圆与屏幕边界重叠的原因)这对您来说应该不是问题,因为我认为您是circleView框架设置为较小。
,我认为您应该可以执行以下操作:
let firstCircle = circles[i]
let secondCircle = circles[j]
let intersect = firstCircle.frame.intersection(secondCircle.frame)
if intersect.isNull {
// The circles do NOT overlap.
} else {
// The circles overlap. Handle accordingly.
}
请注意,这不能处理各种边缘情况,例如将相同的圆彼此进行比较,但这应该简化对它们重叠的理解。