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我創造了一個幸運之輪,我無法阻止它。 我該如何平穩地停止用戶發起的,手勢控制的運動中的圓形對象。我能夠突然停止對象,但希望逐漸平穩地停下來。如何順利暫停動畫?
let spinAnimation = CABasicAnimation()
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 = 10
// 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)
counterView.layer.backgroundColor = UIColor.redColor().CGColor
// add the animation to the button layer
counterView.layer.addAnimation(spinAnimation, forKey: "transform.rotation.z")
它的任何示例?我試圖讓車輪停下來,但不能回到起點。 – Peter
然後不要做'M_PI * 2'的值,而是'M_PI *基於隨機或強制的某個數字'確保隨機數是一個小數,否則你只會做180 – Knight0fDragon