Question

我试图通过更改NSLayoutConstriant的常量来在屏幕上移动UIView。 UIView移动但在移动时没有动画。

初始约束

func setUpView(){
    cont = OverlayController()
    let overlay = (cont?.view!)!


    gameView.addSubview(overlay)
    top = overlay.topAnchor.constraint(equalTo: gameView.bottomAnchor, constant: -175)
    centerX = overlay.centerXAnchor.constraint(equalTo: gameView.centerXAnchor)
    width = overlay.widthAnchor.constraint(equalToConstant: gameView.frame.width * 0.7)
    height = overlay.heightAnchor.constraint(equalToConstant: gameView.frame.width * 0.7)
    centerY = overlay.centerYAnchor.constraint(equalTo: gameView.centerYAnchor)
    top?.isActive = true
    centerX?.isActive = true
    width?.isActive = true
    height?.isActive = true

    let swipeListener = UISwipeGestureRecognizer(target: self, action: #selector(swiped))
    swipeListener.direction = .up
    overlay.addGestureRecognizer(swipeListener)
}

动画方法（向上轻扫）

func animate(){
    centered = !centered
    cont?.view.layoutIfNeeded()
    self.top?.constant = -500


    UIView.animate(withDuration: 3) {
        self.cont?.view.layoutIfNeeded()
    }
}

我如何得到它，以便动画的UIView在移动时会动画？

Answer 1

您需要重新布局超级视图

+----+-----------------------------------------------------------------------------------+----+
|col1|col2                                                                               |col3|
+----+-----------------------------------------------------------------------------------+----+
|152 | XXXXXXXXXX XXXXXXXXXX.1001 0503~ADX\|0\|ZZ~NTE\|ADD\|XXXXXXXXXX/~SE\|40\|0060~GE\||    |
+----+-----------------------------------------------------------------------------------+----+

NSLayoutConstraint没有使用UIView.animate制作动画

1 个答案: