[英]Collision detection in iOS Swift
我為三個按鈕和Floor UIImageView
創建了一個碰撞檢測功能,但是在if !isRotating
代碼行中出現“預期聲明”錯誤。 一點幫助將是巨大的。
import UIKit
class ViewController: UIViewController {
var location = CGPoint(x: 0, y: 0)
var animator: UIDynamicAnimator?
var gravity: UIGravityBehavior?
var isRotating = false
var collision: UICollisionBehavior!
@IBOutlet var Ball1: UIButton!
@IBOutlet var Ball2: UIButton!
@IBOutlet var Ball3: UIButton!
@IBOutlet var Floor: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
self.animator = UIDynamicAnimator(referenceView: self.view)
let gravity = UIGravityBehavior (items: [self.Ball1!, self.Ball2!, self.Ball3!])
let direction = CGVectorMake(0.0, 1.0)
gravity.gravityDirection = direction
self.animator?.addBehavior(gravity)
Ball1.center = CGPointMake(160, 330)
Ball2.center = CGPointMake(39, 163)
Ball3.center = CGPointMake(240, 74)
collision = UICollisionBehavior(items: [Floor!, Ball1!, Ball2!, Ball3!])
collision.translatesReferenceBoundsIntoBoundary = true
collision.addBoundaryWithIdentifier("barrier", fromPoint: CGPointMake(self.view.frame.origin.x, 350), toPoint: CGPointMake(self.view.frame.origin.x + self.view.frame.width, 350))
animator!.addBehavior(collision)
}
if !isRotating {
// create a spin animation
let spinAnimation = CABasicAnimation()
// starts from 0
spinAnimation.fromValue = 0
// goes to 360 ( 2 * π )
spinAnimation.toValue = M_PI*2
// define how long it will take to complete a 360
spinAnimation.duration = 1
// make it spin infinitely
spinAnimation.repeatCount = Float.infinity
// do not remove when completed
spinAnimation.removedOnCompletion = false
// specify the fill mode
spinAnimation.fillMode = kCAFillModeForwards
// and the animation acceleration
spinAnimation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionLinear)
// add the animation to the button layer
Ball1.layer.addAnimation(spinAnimation, forKey: "transform.rotation.z")
Ball2.layer.addAnimation(spinAnimation, forKey: "transform.rotation.z")
Ball3.layer.addAnimation(spinAnimation, forKey: "transform.rotation.z")
} else {
// remove the animation
Ball1.layer.removeAllAnimations()
Ball2.layer.removeAllAnimations()
Ball3.layer.removeAllAnimations()
}
// toggle its state
isRotating = !isRotating
}
我開始清理您的代碼以使其易於閱讀,並真的很難找到匹配的花括號。 然后我意識到,那是你的問題:)
您的viewDidLoad()
方法從此處開始:
override func viewDidLoad() {
super.viewDidLoad()
self.animator = UIDynamicAnimator(referenceView: self.view)
並在這里結束:
animator!.addBehavior(collision)
}
之后,您將獲得以下代碼: if !isRotating {
。 Xcode抱怨是因為您的代碼只是散布在類中,這是不允許的。 該代碼需要放入自己的方法中,例如func createSpinAnimation()
。
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