ios - 如何防止 UIViews 接触

Question

所以我在屏幕中央有一个 150 x 150 的主 Imageview，我以编程方式创建具有随机 x 和 y 值以及随机宽度/高度(这些值相同)的 View 。我希望 View 围绕主 ImageView 但不要触摸它。同样在 y 轴上，我有一个带有 self.view.frame 和高度 35 的标签栏，我也不希望这些 View 触及。有什么想法吗？

Answer 1

为什么不随机化极坐标(角度和半径，引用是 ImageView 的中心)而不是笛卡尔坐标(x 和 y)？如果您有角度和半径，将更容易控制距中心的距离。您可以根据最终的随机宽度和高度增加半径，使其离中心更远，以进行补偿并避免碰撞。

let centerImageView = UIImageView()

//..

//Bounding circle for the image view
let centerRadius = max(centerImageView.width, centerImageView.height)

func randomFloat(min: Float, max: Float) {
    return min + (max - min) * (arc4random() / RAND_MAX)
}

//Somewhere else in your loop for generating views

let angle = randomFloat(0, Float.pi * 2)
//Dimensions of the random view
let width = randomFloat(min: 10, max: 50)
let height = randomFloat(min: 10, max: 50)
//Bounding circle, you can use an ellipse, or calculate the distance perfectly for that angle too, but this is simpler
let viewRadius = randomFloat(min: width, max: height)
//The distance from the center must be greater than the sum of both bounding circles' radiuses, plus some
let radius = centerRadius + viewRadius + randomFloat(min: 50, max: 100)
//Convert to cartesian coordinates
let x = centerImageView.center.x + cos(angle) * radius
let y = centerImageView.center.y + sin(angle) * radius

let view = UIView(frame: CGRect(x: x, y: y, width: width, height: height)