xcode 如何在 Swift 中移动图像？
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How can I move an image in Swift?
提问by adman
I would like to be able to move an object (in my case, an image "puppy") up 1 pixel every time a button is pressed. I've stumbled upon old Objective-C solutions as well as Swift code that was similar, but none that fit my specific problem. I would love to know an easy way to move my image. This is my code so far from what I could gather(I'm hoping it's unnecessarily long and can be reduced to a line or two):
我希望每次按下按钮时都能将对象（在我的情况下，图像“小狗”）向上移动 1 个像素。我偶然发现了旧的 Objective-C 解决方案以及类似的 Swift 代码，但没有一个适合我的具体问题。我很想知道一种移动图像的简单方法。这是我的代码到目前为止我可以收集的（我希望它不必要地长并且可以减少到一两行）：
@IBAction func tapButton() {
UIView.animateWithDuration(0.75, delay: 0, options: UIViewAnimationOptions.CurveLinear, animations: {
self.puppy.alpha = 1
self.puppy.center.y = 0
}, completion: nil)
var toPoint: CGPoint = CGPointMake(0.0, 1.0)
var fromPoint : CGPoint = CGPointZero
var movement = CABasicAnimation(keyPath: "movement")
movement.additive = true
movement.fromValue = NSValue(CGPoint: fromPoint)
movement.toValue = NSValue(CGPoint: toPoint)
movement.duration = 0.3
view.layer.addAnimation(movement, forKey: "move")
}
采纳答案by Dharmesh Kheni
This way you can change a position of your imageView
这样你就可以改变你的位置 imageView
@IBAction func tapButton() {
UIView.animateWithDuration(0.75, delay: 0, options: .CurveLinear, animations: {
// this will change Y position of your imageView center
// by 1 every time you press button
self.puppy.center.y -= 1
}, completion: nil)
}
And remove all other code from your button action.
并从按钮操作中删除所有其他代码。
回答by Chetan Prajapati
CATransaction.begin()
CATransaction.setCompletionBlock { () -> Void in
self.viewBall.layer.position = self.viewBall.layer.presentationLayer().position
}
var animation = CABasicAnimation(keyPath: "position")
animation.duration = ballMoveTime
var currentPosition : CGPoint = viewBall.layer.presentationLayer().position
animation.fromValue = NSValue(currentPosition)
animation.toValue = NSValue(CGPoint: CGPointMake(currentPosition.x, (currentPosition.y + 1)))
animation.removedOnCompletion = false
animation.fillMode = kCAFillModeForwards
viewBall.layer.addAnimation(animation, forKey: "transform")
CATransaction.commit()
Replace viewBall to your image object
将 viewBall 替换为您的图像对象
And also remove completion block if you don't want.
如果您不想要，也可以删除完成块。
回答by Rishi
You can do this.
你可以这样做。
func clickButton() {
UIView.animateWithDuration(animationDuration, animations: {
let buttonFrame = self.button.frame
buttonFrame.origin.y = buttonFrame.origin.y - 1.0
self.button.frame = buttonFrame
}
}
