你是如何制作连续动画的？

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。编码时是什么样子的？

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（基本上和图片一样，只是每次我尝试让它逐渐淡出时 - 它会破坏整个动画）

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东西。

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,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,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 但我遇到了一个问题。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)

解决方法

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变化的延迟，并进行了一些调整，但这就是我想到的

//CHANGE LABEL ON TIMER
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 13.5) 
{ [self] in
self.labelNegBeliefFinal.text = self.posBeliefLabelGlowerText
}
               
            
        
        
        
        
        
        

这里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,animations: { self.labelNegBeliefFinal.transform = CGAffineTransform(scaleX: 
1.3,y: 1.3) })
        
// }

这是我想出的补间代码，感谢 Matt 指出正确方向。不知道你可以在 SwiftUI 中补间。让我失望的一件事是，如果持续时间为 30 秒，则相对持续时间设置为 0.5 等于 15 秒，因为它是 30 秒中的 0.5。我的一些补间似乎不起作用，因为我没有意识到这一点。

UIView.animateKeyframes(withDuration: 30.0,options: [ ],animations: {

                                
                                    UIView.addKeyframe(withRelativeStartTime: 
0,relativeDuration: 0.5,animations: { self.labelNegBeliefFinal.alpha = 0 })
                                    
                                    
                                    UIView.addKeyframe(withRelativeStartTime: 
0.5,animations: { self.labelNegBeliefFinal.alpha = 1 })
                                    

        },completion: nil)
    
        
    

    }


}

我从另一个帖子中得到的发光样式

//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
    }





}