ios - [CAKeyframeAnimation setFromValue :]: unrecognized selector sent to instance

Question

我正在尝试使用 keyframeanimate 为按钮设置动画，我想修改它的 tintColor 和按钮宽度约束，我想将其缩放 2 倍，反之亦然，这是我的代码

func InitialAnimationToTutorialButton() {
        UIView.animateKeyframes(withDuration: 1.5, delay: 0, options: [.repeat], animations: {

            UIView.addKeyframe(withRelativeStartTime: 0, relativeDuration: 0.1, animations: {
                self.tutorialButton.tintColor = UIColor(rgb: 0xDB4284)
                self.tutorialButtonWidth.constant = 60
                self.view.layoutIfNeeded()
            })

            UIView.addKeyframe(withRelativeStartTime: 0.1, relativeDuration: 0.1, animations: {
                self.tutorialButton.tintColor = UIColor(rgb: 0x554E6E)
                self.tutorialButtonWidth.constant = 30
                self.view.layoutIfNeeded()
            })

            UIView.addKeyframe(withRelativeStartTime: 0.3, relativeDuration: 0.1, animations: {
                self.tutorialButton.tintColor = UIColor(rgb: 0xDB4284)
                self.tutorialButtonWidth.constant = 60
                self.view.layoutIfNeeded()
            })

            UIView.addKeyframe(withRelativeStartTime: 0.4, relativeDuration: 0.1, animations: {
                self.tutorialButton.tintColor = UIColor(rgb: 0x554E6E)
                self.tutorialButtonWidth.constant = 30
                self.view.layoutIfNeeded()
            })

        }) { (finishFlag) in

        }
    }

但是当我运行它时，我遇到了一个异常，如下所示:

由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因:“-[CAKeyframeAnimation setFromValue:]:无法识别的选择器发送到实例 0x2820e06e0”

Answer 1

我意识到如何解决这个错误。 self.view.layoutIfNeeded() 应该在 block 之外，所以我这样做并修复了错误，所以这里是正确的代码:

func InitialAnimationToTutorialButton() {
        UIView.animateKeyframes(withDuration: 1.5, delay: 0, options: [.repeat], animations: {

            UIView.addKeyframe(withRelativeStartTime: 0, relativeDuration: 0.1, animations: {
                self.tutorialButton.tintColor = UIColor(rgb: 0xDB4284)
                self.tutorialButtonWidth.constant = 60
            })

            UIView.addKeyframe(withRelativeStartTime: 0.1, relativeDuration: 0.1, animations: {
                self.tutorialButton.tintColor = UIColor(rgb: 0x554E6E)
                self.tutorialButtonWidth.constant = 30
            })

            UIView.addKeyframe(withRelativeStartTime: 0.3, relativeDuration: 0.1, animations: {
                self.tutorialButton.tintColor = UIColor(rgb: 0xDB4284)
                self.tutorialButtonWidth.constant = 60
            })

            UIView.addKeyframe(withRelativeStartTime: 0.4, relativeDuration: 0.1, animations: {
                self.tutorialButton.tintColor = UIColor(rgb: 0x554E6E)
                self.tutorialButtonWidth.constant = 30
            })
        self.view.layoutIfNeeded()

        }) { (finishFlag) in

        }
    }