導讀
簡單用Swift寫了一個抽屜效果,可以直接使用并且簡單;
很多軟件都運了抽屜效果，比如qq的左抽屜，英雄聯盟,滴滴打車，和uber等等都運用了抽屜;
效果
iOS抽屜式結構實現分析
主要是在控制器的View上添加了兩個View,一個左側leftView和一個mainView。這里我們自定義一個DrawerViewController，init(mainVC: UIViewController, leftMenuVC: UIViewController, leftWidth: CGFloat)設置，一個mainVC，一個leftMenuVC，和一個寬度,將mainVC和leftMenuVC的view添加到controller的view上（menuVC的view在下面）。
view.addSubview(leftMenuVC.view) view.addSubview(mainVC.view) addChildViewController(leftMenuVC) addChildViewController(mainVC)
然后首先實現點擊方法openLeftMenu和closeLeftMenu（這兩個方法主要是計算mainVC的view的位置）方便以后調用。
//MARK: - 打開左側菜單 func openLeftMenu() { UIView.animate(withDuration: 0.25, delay: 0, options: UIViewAnimationOptions.curveLinear, animations: { self.leftVC?.view.transform = CGAffineTransform.identity self.mainVC?.view.transform = CGAffineTransform(translationX: self.maxWidth, y: 0) }, completion: { (finish: Bool) -> () in self.mainVC?.view.addSubview(self.coverBtn) }) } //MARK: - 關閉左側菜單 func closeLeftMenu() { UIView.animate(withDuration: 0.25, delay: 0, options: UIViewAnimationOptions.curveLinear, animations: { self.leftVC?.view.transform = CGAffineTransform(translationX: -self.maxWidth, y: 0) self.mainVC?.view.transform = CGAffineTransform.identity }, completion: { (finish: Bool) -> () in self.coverBtn.removeFromSuperview() }) }最后給mainVC的view添加屏幕邊緣手勢，實現mainVC的view跟隨手指移動。循環遍歷view給每一個一級視圖添加手勢
for childViewController in (mainVC?.childViewControllers)! { addScreenEdgePanGestureRecognizerToView(view: childViewController.view) }//MARK: - 添加屏幕邊緣手勢 private func addScreenEdgePanGestureRecognizerToView(view: UIView) { let pan = UIScreenEdgePanGestureRecognizer(target: self, action: #selector(edgPanGesture(_:))) pan.edges = UIRectEdge.left view.addGestureRecognizer(pan) }在平移手勢調用的方法中，通過偏移量來確定mainView的frame，實現動畫效果
打開手勢
//MARK: - 屏幕左邊緣手勢 func edgPanGesture(_ pan: UIScreenEdgePanGestureRecognizer) { let offsetX = pan.translation(in: pan.view).x if pan.state == UIGestureRecognizerState.changed && offsetX <= maxWidth { mainVC?.view.transform = CGAffineTransform(translationX: max(offsetX, 0), y: 0) leftVC?.view.transform = CGAffineTransform(translationX: -maxWidth + offsetX, y: 0) } else if pan.state == UIGestureRecognizerState.ended || pan.state == UIGestureRecognizerState.cancelled || pan.state == UIGestureRecognizerState.failed { if offsetX > screenW * 0.5 { openLeftMenu() } else { closeLeftMenu() } } }關閉遮蓋手勢
//MARK: - 遮蓋按鈕手勢 func panCloseLeftMenu(_ pan: UIPanGestureRecognizer) { let offsetX = pan.translation(in: pan.view).x if offsetX > 0 {return} if pan.state == UIGestureRecognizerState.changed && offsetX >= -maxWidth { let distace = maxWidth + offsetX mainVC?.view.transform = CGAffineTransform(translationX: distace, y: 0) leftVC?.view.transform = CGAffineTransform(translationX: offsetX, y: 0) } else if pan.state == UIGestureRecognizerState.ended || pan.state == UIGestureRecognizerState.cancelled || pan.state == UIGestureRecognizerState.failed { if offsetX > screenW * 0.5 { openLeftMenu() } else { closeLeftMenu() } } }UIPresentationController簡介
直接貼代碼不講廢話
@IBAction func showAlert(_ sender: UIBarButtonItem) { let popVC = PopViewController() popVC.modalPresentationStyle = UIModalPresentationStyle.popover popVC.popoverPresentationController?.barButtonItem = sender popVC.popoverPresentationController?.delegate = self //可控制三角顏色 popVC.popoverPresentationController?.backgroundColor = UIColor.white present(popVC, animated: true, completion: nil) } func adaptivePresentationStyle(for controller: UIPresentationController) -> UIModalPresentationStyle { return UIModalPresentationStyle.none } func popoverPresentationControllerShouldDismissPopover(_ popoverPresentationController: UIPopoverPresentationController) -> Bool { return true }具體代碼可以從這里下載：WLDrawerView.rar
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持VEVB武林網。
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