产品中经常出现手势滑动的需求，但是结合tableview的手势就会出现冲突，下面是一些tableview结合全局手势的实践方案。
页面滑动
给页面添加滑动手势
let pan = UIPanGestureRecognizer() pan.rx.event.subscribe(onNext: { [weak self] (recognizer: UIPanGestureRecognizer) in self?.panGestureStationTogetherAction(recognizer) }).addDisposableTo(disposeBag) lineListView?.stationHeaderDetailView.addGestureRecognizer(pan)
- 手势处理方式
// MARK: 站点滑动手势统一处理
func panGestureStationTogetherAction(_ recognizer: UIPanGestureRecognizer) {
let wself = self
guard let gestureView = wself.lineListView else {return}
if recognizer.state == .began || recognizer.state == .changed {
let movement = recognizer.translation(in: wself.view)
var old_rect = gestureView.frame
let listViewEmptyHeight = gestureView.getEmptyHeight()
let stationDetailHeight: CGFloat = 68.0
if recognizer.state == .began {
old_rect.origin.y = old_rect.origin.y - listViewEmptyHeight - stationDetailHeight
}
else {
old_rect.origin.y = old_rect.origin.y + movement.y
}
if old_rect.origin.y < 0 {
gestureView.frame = wself.view.bounds
}
else if old_rect.origin.y > wself.view.bounds.height {
gestureView.frame = CGRect.init(x: 0, y: wself.view.bounds.height, width: wself.view.bounds.width, height: wself.view.bounds.height)
}
else {
gestureView.frame = old_rect
}
recognizer.setTranslation(CGPoint.zero, in: wself.view)
}
else if recognizer.state == .ended || recognizer.state == .cancelled {
let halfPoint = wself.view.bounds.height*1/4
if gestureView.frame.origin.y > halfPoint {
gestureView.dismiss()
}
else {
gestureView.show(superView: wself.view)
}
}
}
滑动时候.began || recognizer.state == .changed是在滑动手势没有停止的时候，这个时候可以动态调整ListView的y值
guard let gestureView = wself.lineListView else {return}
lineListView是被处理的view，并不一定是滑动的view，滑动view可以使任何一个view，把手势的变化统一传到这里就好了panGestureStationTogetherAction。
let movement = recognizer.translation(in: wself.view)
获取手势滑动离原位置的CGPoint，这样我们就有了移动的x，y。
if recognizer.state == .began {
old_rect.origin.y = old_rect.origin.y - listViewEmptyHeight - stationDetailHeight
}
else {
old_rect.origin.y = old_rect.origin.y + movement.y
}
开始状态，初始化ListView的frame，changed状态，获取当前最新的frame的y加上最新的移动的y，old_rect.origin.y = old_rect.origin.y + movement.y
recognizer.setTranslation(CGPoint.zero, in: wself.view)
改变frame之后，重置手势CGPoint为zero
else if recognizer.state == .ended || recognizer.state == .cancelled {
let halfPoint = wself.view.bounds.height*1/4
if gestureView.frame.origin.y > halfPoint {
gestureView.dismiss()
}
else {
gestureView.show(superView: wself.view)
}
}
当手势结束或取消的时候，处理ListView的弹出或者下沉动画。
func show(superView: UIView) {
showBlock?()
tableView.setContentOffset(CGPoint.zero, animated: false)
UIView.animate(withDuration: 0.3) {
self.frame = superView.bounds
}
}
@objc func dismiss() {
dismissBlock?()
UIView.animate(withDuration: 0.3) {
self.frame = CGRect.init(x: 0, y: self.bounds.height - 268, width: self.bounds.width, height: self.bounds.height)
}
}
TableView滑动结合页面滑动处理
//linelistview_tableview滑动
lineListView?.tableView.panGestureRecognizer.rx.event.subscribe(onNext: { [weak self] (recognizer: UIPanGestureRecognizer) in
guard let foffy = self?.lineListView?.frame.origin.y else {return}
guard let offy = self?.lineListView?.tableView.contentOffset.y else {return}
if foffy > CGFloat(0.0) || offy < CGFloat(0.0) {
self?.panGestureStationTogetherAction(recognizer)
}
}).addDisposableTo(disposeBag)
tableview是继承scrollview完成的封装。scrollview自带panGestureRecognizer手势，所以可以直接获取scrollview手势的动态变化。由于封装的手势处理可以给任何滑动手势用，所以可以直接把tableview滑动手势直接传给统一手势处理方法。
guard let foffy = self?.lineListView?.frame.origin.y else {return}
foffy > CGFloat(0.0)
1、判断滑动的ListView的frame的y值是否已经超出规定范围，超出就不再处理滑动，我的实现是小于0就不再处理滑动。
guard let offy = self?.lineListView?.tableView.contentOffset.y else {return}
offy < CGFloat(0.0)
2、tableview的偏移量必须是小于0的这也才能处理滑动，不然会造成tableview和listview一起滑动的效果，很不自然。
上面1、2条件必须放在一起使用，才能保证滑动手势和view本身的手势完美结合
tableView.setContentOffset(CGPoint.zero, animated: false)
滑动结束之后要记得把tableview的偏移量设为zero，这样可以解决快速滑动时出现的小bug。