迅捷-动画方向
迅捷-动画方向
提问于 2018-01-12 02:02:37
我有一个简单的问题做恶梦。在我的应用程序中，我有云在后台移动(目前从左到右)。
然而，有了背景，他们需要从右到左。
编辑了下面更多的页面代码。希望这能更容易地找出我哪里出了错。
@IBOutlet var cloud1: UIImageView!
@IBOutlet var cloud2: UIImageView!
@IBOutlet var cloud3: UIImageView!
@IBOutlet var cloud4: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func viewWillAppear(_ animated: Bool) {
cloud1.alpha = 0.0
cloud2.alpha = 0.0
cloud3.alpha = 0.0
cloud4.alpha = 0.0
}
override func viewDidAppear(_ animated: Bool) {
UIView.animate(withDuration: 2.0, delay: 0.1,
options: [],
animations: {
self.cloud1.alpha = 1.0
}, completion: nil)
UIView.animate(withDuration: 2.0, delay: 0.1,
options: [],
animations: {
self.cloud2.alpha = 1.0
}, completion: nil)
UIView.animate(withDuration: 2.0, delay: 0.1,
options: [],
animations: {
self.cloud3.alpha = 1.0
}, completion: nil)
UIView.animate(withDuration: 2.0, delay: 0.1,
options: [],
animations: {
self.cloud4.alpha = 1.0
}, completion: nil)
animateTheClouds(cloud: cloud1)
animateTheClouds(cloud: cloud2)
animateTheClouds(cloud: cloud3)
animateTheClouds(cloud: cloud4)
}
func animateTheClouds(cloud : UIImageView) {
let cloudMovingSpeed = 60.0/view.frame.size.width
let duration = (view.frame.size.width - cloud.frame.origin.x) * cloudMovingSpeed
UIView.animate(withDuration: TimeInterval(duration), delay: 0.0, options: .curveLinear, animations: {
// Animate the origin to be off the left side of the screen.
cloud.frame.origin.x = cloud.frame.size.width
}, completion: {_ in
// Reset back to the right edge of the screen
cloud.frame.origin.x = -self.view.frame.size.width
self.animateTheClouds(cloud: cloud)
})回答 1
Stack Overflow用户
回答已采纳
发布于 2018-01-12 02:07:38
如果您想将它们从右移到左，那么只需更改起始和结束x原点。
func animateTheClouds(cloud : UIImageView) {
let cloudMovingSpeed = 60.0/view.frame.size.width
let duration = (cloud.frame.origin.x + cloud.frame.size.width) * cloudMovingSpeed
UIView.animate(withDuration: TimeInterval(duration), delay: 0.0, options: .curveLinear, animations: {
// Animate the origin to be off the left side of the screen.
cloud.frame.origin.x = -cloud.frame.size.width
}, completion: {_ in
// Reset back to the right edge of the screen
cloud.frame.origin.x = self.view.frame.size.width
self.animateTheClouds(cloud: cloud)
})还要确保初始x原点设置为self.view.frame.size.width。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/48218535
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