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从一个位置移动到另一个位置后更改了uiButton框架

rotation uibutton swift ios

Kuldeep Jayesh Lathiya · 技术社区 · 8 年前

我有一个 UIButton 在里面 StoryBoard 就像在屏幕下面我移动 U按钮 从一个位置到另一个位置 Answer .

编辑

我想旋转的另一件事 U按钮 为此,我尝试了下面的代码,它运行良好,但经过旋转 U按钮 当我试图移动 U按钮 从一个地方到另一个地方 U按钮 框架已更改。

全部 U按钮 代码。

class DraggableButton: UIButton {

var localTouchPosition : CGPoint?
var lastRotation: CGFloat = 0

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)

    // ROTATION CODE
    let rotate = UIRotationGestureRecognizer(target: self, action:#selector(rotatedView(_:)))
    self.addGestureRecognizer(rotate)
}

// SCROLLING CONTENT FROM ONE POSITION TO ANOTHER
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    super.touchesBegan(touches, with: event)
    let touch = touches.first
    self.localTouchPosition = touch?.preciseLocation(in: self)
}

override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
    super.touchesMoved(touches, with: event)
    let touch = touches.first
    guard let location = touch?.location(in: self.superview), let localTouchPosition = self.localTouchPosition else{
        return
    }

    self.frame.origin = CGPoint(x: location.x - localTouchPosition.x, y: location.y - localTouchPosition.y)
    print(self.frame)
}

override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
    super.touchesEnded(touches, with: event)
    self.localTouchPosition = nil
}

override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) {
    super.touchesCancelled(touches, with: event)
    self.localTouchPosition = nil
}

// ROTATION CODE
@objc func rotatedView(_ sender: UIRotationGestureRecognizer) {
    var originalRotation = CGFloat()
    if sender.state == .began {
        sender.rotation = lastRotation
        originalRotation = sender.rotation
    } else if sender.state == .changed {
        let newRotation = sender.rotation + originalRotation
        sender.view?.transform = CGAffineTransform(rotationAngle: newRotation)
        } else if sender.state == .ended {
            lastRotation = sender.rotation
        }
    }
}

编辑1

我上传了问题视频。

编辑2

如果我用 U按钮 旋转和移动代码分开,然后它工作,但当我写这两个代码,它产生这个问题。

1 回复 | 直到 8 年前

vacawama 8 年前

我认为问题在于旋转是围绕视图中心的,所以当应用旋转时,帧大小会增加,从而抛出相对于帧原点的距离。

我可以通过将视图相对于其中心移动来修复此问题:

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    super.touchesBegan(touches, with: event)
    let touch = touches.first
    guard let location = touch?.location(in: self.superview) else { return }

    // Store localTouchPosition relative to center
    self.localTouchPosition = CGPoint(x: location.x - self.center.x, y: location.y - self.center.y)
}

override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
    super.touchesMoved(touches, with: event)
    let touch = touches.first
    guard let location = touch?.location(in: self.superview), let localTouchPosition = self.localTouchPosition else{
        return
    }

    self.center = CGPoint(x: location.x - localTouchPosition.x, y: location.y - localTouchPosition.y)
    print(self.frame)
}