你如何制作连续的动画？

Question

我想制作连续的动画，比如一个接着一个，而不是循环播放或一次制作一个。编码时它看起来像什么？

示例：在不透明度为 100% 时淡入，然后在不透明度为 20% 时淡出，然后淡入 80%，然后淡出 10%...就像脉冲一样，然后在 0% 时更改标签文本并执行相反（基本上与图片相同，只是每次我尝试让它逐渐淡出 - 它扰乱了整个动画）

gif 显示了它的当前状态，而不是我迄今为止尝试过但没有用的。

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运行遇到了一些问题。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)

Answer 1

所以我无法将标签合并到关键帧动画中，所以我只是设置了草包更换的延迟，并进行了一些调整，但这是我想出的

//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 指出了正确的方向。不知道您可以在 SwiftUI 中补间。让我失望的一件事是，如果持续时间为 30 秒，则设置为 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)
    
        
    

    }


}

我从另一个地方得到的发光样式post

//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
    }





}

你如何制作连续的动画？

How do you do successive animations?

xcode

glow

swift