在完成塊中的UIView動畫執行代碼之前完成

Question

在按鈕上單擊我要旋轉180度的視圖。 動畫之后，我想隱藏並顯示圖像和標簽。 但是用於隱藏和顯示圖像和標簽的完成代碼在動畫完成之前執行。 檢查以下代碼，讓我知道我在任何地方錯了嗎？

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

將動畫添加到圖層沒有等待時間您需要完全在動畫塊內部制作動畫邏輯，例如更改幀或執行此操作

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)
    }

}