Question

在按钮上单击“我想将视图旋转180度”。动画之后，我想隐藏并显示图像和标签。但是用于隐藏和显示图像和标签的完成代码在动画完成之前执行。检查以下代码，让我知道我在任何地方都错了吗？

var animation = CABasicAnimation(keyPath: "transform.rotation.y")
    animation.fromValue = NSNumber(value: 0)
    animation.toValue = NSNumber(value: Double.pi)
    animation.repeatCount = 1
    animation.duration = 5.0

    UIView.animate(withDuration: 5.0, animations: {
        self.viewContainer.layer.add(animation, forKey: "rotation")
    }, completion: { finished in
        if finished {
            if self.strInfo == "Image" {
                self.strInfo = "Info"

                self.lblInfo.isHidden = false
                self.imageView.isHidden = true

                self.btnInfo.setBackgroundImage(UIImage(named:"close"), for: .normal)

            } else if self.strInfo == "Info"{
                self.strInfo = "Image"

                self.lblInfo.isHidden = true
                self.imageView.isHidden = false

                self.imageView.image = UIImage(named: self.strPhotoName)
                self.btnInfo.setBackgroundImage(UIImage(named:"info"), for: .normal)
            }
        }
    })

Answer 1

将动画添加到图层没有等待时间，您需要使动画块内部的动画逻辑完全改变，例如更改帧或执行此操作

self.viewContainer.layer.add(animation, forKey: "rotation")

DispatchQueue.main.asyncAfter(deadline: .now() + 5.0) {

    if self.strInfo == "Image" {
        self.strInfo = "Info"

        self.lblInfo.isHidden = false
        self.imageView.isHidden = true

        self.btnInfo.setBackgroundImage(UIImage(named:"close"), for: .normal)

    } else if self.strInfo == "Info"{
        self.strInfo = "Image"

        self.lblInfo.isHidden = true
        self.imageView.isHidden = false

        self.viewContainer.backgroundColor = .white

        self.imageView.image = UIImage(named: self.strPhotoName)

        self.btnInfo.setBackgroundImage(UIImage(named:"info"), for: .normal)
    }

}

在完成块中的UIView动画执行代码之前完成

1 个答案: