swift - 你如何做连续的动画?
问题描述
我想做连续的动画,比如一个接一个,而不是一个循环或一次一个。编码时它看起来像什么?
示例:淡入@ 100% 不透明度,然后淡出@ 20% 不透明度,然后淡入 80%,然后淡出 10% ......所以就像一个脉冲然后在 0% 更改标签文本并执行相反的操作(基本上仅在我每次尝试使其逐渐淡出时都与图片相同-它会破坏整个动画)
gif 显示它的当前状态,而不是我迄今为止尝试过的没有工作的状态。
import UIKit
class Belief2ViewController: UIViewController {
@IBOutlet var negBeliefLabelGlower: UILabel!
@IBOutlet var posBeliefLabelGlower: UILabel!
@IBOutlet var labelNegBeliefFinal: UILabel!
@IBOutlet var startButton: UIButton!
//PASSING INFO
var negBeliefLabelGlowerText = String()
var posBeliefLabelGlowerText = String()
override func viewDidLoad() {
super.viewDidLoad()
//PASSING INFO
negBeliefLabelGlower.text = negBeliefLabelGlowerText
posBeliefLabelGlower.text = posBeliefLabelGlowerText
//PASSING INFO
labelNegBeliefFinal.text = negBeliefLabelGlowerText
//GLOW
labelNegBeliefFinal.UILableTextShadow(color: UIColor.systemTeal)
//AniamtionOpacityLOOP
labelNegBeliefFinal.alpha = 0.3
// UIView.animate(withDuration: 5, animations: {self.labelNegBeliefFinal.alpha = 100}, completion: { _ in self.labelNegBeliefFinal.alpha = 90;})
UIView.animate(withDuration: 6, delay: 0, options: [.autoreverse, .repeat], animations: { self.labelNegBeliefFinal.alpha = 100 })
//AnimationBreathSizeLOOP
UIView.animate(withDuration: 6, delay: 0, options: [.autoreverse, .repeat], animations: { self.labelNegBeliefFinal.transform = CGAffineTransform(scaleX: 1.3, y: 1.3) })
}
@IBAction func startButtonPress(_ sender: Any) {
//self.labelNegBeliefFinal.text = self.posBeliefLabelGlowerText
// UIView.animate(withDuration: 10, animations: {self.labelNegBeliefFinal.alpha = 0}, completion: { _ in self.labelNegBeliefFinal.text = self.posBeliefLabelGlowerText;})
UIView.animate(withDuration: 10, delay: 0, animations: {self.labelNegBeliefFinal.alpha = 0}, completion: { _ in
self.labelNegBeliefFinal.text = self.posBeliefLabelGlowerText ;})
//
}
}
//GLOW
extension UILabel {
func UILableTextShadow1(color: UIColor){
textColor = UIColor.systemTeal
layer.shadowColor = UIColor.systemTeal.cgColor
layer.masksToBounds = false
layer.shadowOffset = .zero
layer.shouldRasterize = true
layer.rasterizationScale = UIScreen.main.scale
layer.shadowRadius = 5.0
layer.shadowOpacity = 5.0
}
}
编辑
好的,所以按照建议使用关键帧是一个完美的建议,但我遇到了一些问题。我无法键入要更改的标签文本
UIView.animateKeyframes(withDuration: 15.0,
delay: 0.0,
options: [],
animations: {
UIView.addKeyframe(withRelativeStartTime: 1,
relativeDuration: 0.0,
animations: { self.labelNegBeliefFinal.text = self.posBeliefLabelGlowerText })
},
completion: nil)
解决方案
所以我无法将标签合并到关键帧动画中,所以我只是设置了一个延迟来改变捆包,并进行了一些调整,但这就是我想出的
//CHANGE LABEL ON TIMER
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 13.5)
{ [self] in
self.labelNegBeliefFinal.text = self.posBeliefLabelGlowerText
}
这是之前的发光循环和大小循环,与补间无关
//AniamtionGlowLOOP
UIView.animate(withDuration: 6, delay: 0, options: [.autoreverse, .repeat],
animations: { self.labelNegBeliefFinal.layer.shadowOpacity = 5.0 })
//AnimationBreathSizeLOOP
UIView.animate(withDuration: 6, delay: 0, options: [.autoreverse, .repeat],
animations: { self.labelNegBeliefFinal.transform = CGAffineTransform(scaleX:
1.3, y: 1.3) })
// }
这是我想出的补间代码,感谢 Matt 指出的正确方向。不知道你可以在 SwiftUI 中进行补间。让我失望的一件事是,如果持续时间是 30 秒,那么设置为 0.5 的相对持续时间等于 15 秒,因为它是 30 秒的 0.5。我的一些补间似乎没有工作,因为我没有意识到这一点。
UIView.animateKeyframes(withDuration: 30.0,
delay: 0,
options: [ ],
animations: {
UIView.addKeyframe(withRelativeStartTime:
0,
relativeDuration: 0.5,
animations: { self.labelNegBeliefFinal.alpha = 0 })
UIView.addKeyframe(withRelativeStartTime:
0.5,
relativeDuration: 0.5,
animations: { self.labelNegBeliefFinal.alpha = 1 })
},
completion: nil)
}
}
我从另一个帖子中得到的发光风格
//GLOW
extension UILabel {
func UILableTextShadow1(color: UIColor){
textColor = UIColor.systemTeal
layer.shadowColor = UIColor.systemTeal.cgColor
layer.masksToBounds = false
layer.shadowOffset = .zero
layer.shouldRasterize = true
layer.rasterizationScale = UIScreen.main.scale
layer.shadowRadius = 5.0
layer.shadowOpacity = 00.7
}
}
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