ios - 使用 pangesture 在父 View 中移动 UIView

Question

我想在父 View 中移动一个 View ，我正在使用 UIPanGestureRecognizer 移动 View 。我正在使用以下代码。

-(void)move:(UIPanGestureRecognizer *)recognizer {
    CGPoint touchLocation = [recognizer locationInView:self.customeView];

    self.view.center = touchLocation;
}

我想使用 locationInView 来移动 View 而不是 translationInView。谁能帮助我如何使用 locationInView 在父 View 中移动 View ？

Answer 1

UIPanGestureRecognizer 您走在正确的轨道上。您可能缺少开始和结束手势状态处理。这是一个完整的解决方案，我刚刚在示例项目 (Swift) 中将 panView 作为 View Controller Root View 的子类放在一起。

class ViewController: UIViewController {

    @IBOutlet weak var panView: UIView!

    // records the view's center for use as an offset while dragging
    var viewCenter: CGPoint!

    override func viewDidLoad() {
        super.viewDidLoad()
        panView.addGestureRecognizer(UIPanGestureRecognizer(target: self, action: #selector(self.dragView)))
    }

    func dragView(gesture: UIPanGestureRecognizer) {
        let target = gesture.view!

        switch gesture.state {
        case .began, .ended:
            viewCenter = target.center
        case .changed:
            let translation = gesture.translation(in: self.view)
            target.center = CGPoint(x: viewCenter!.x + translation.x, y: viewCenter!.y + translation.y)
        default: break
        }
    }

}