一款记账类APP，参考了鲨鱼记账、支付宝、网易有钱等APP，其中包含了网易有钱下拉退出动画、鲨鱼记账上拉切换月份列表动画等。
自定义UICollectionViewFlowLayout
1）定义一个数组，存放UICollectionViewLayoutAttributes
var attArray: NSMutableArray = NSMutableArray.init()
2）重写prepare()
override func prepare() {
super.prepare()
self.attArray.removeAllObjects()
//定义当前行数、页数变量
var lineNum: NSInteger = 1;
var page: NSInteger = 0;
//定义itemsize
let originX: CGFloat = self.collectionView?.frame.width ?? 0
let attWidth: CGFloat = (self.collectionView?.frame.width ?? 0 - 22) / 5
let attHeight: CGFloat = self.itemSize.height;
let items: NSInteger = self.collectionView?.numberOfItems(inSection: 0) ?? 0
for i in 0...(items - 1) {
let index: NSIndexPath = NSIndexPath.init(row: i, section: 0)
let att: UICollectionViewLayoutAttributes = UICollectionViewLayoutAttributes.init(forCellWith: index as IndexPath)
//因为我是一行显示5个，所以取计算5的余数，如果==0就换行，一来i = 0，所以lineNum初始值为0，从第一行开始添加
if (i % 5 == 0) {
lineNum = lineNum == 0 ? 1 : 0;
}
//超过10个就加一页，让x坐标加上页数 * collectionview宽度
if ((NSInteger)(i / 10) >= 0) {
page = i / 10;
}
//计算frame
att.frame = CGRect.init(x: CGFloat.init((i % 5)) * attWidth + (originX * CGFloat.init(page)), y: CGFloat.init(lineNum) * (attHeight + self.minimumLineSpacing) + self.sectionInset.top, width: attWidth, height: attHeight)
self.attArray.add(att)
}
}
3）设置contentSize
override var collectionViewContentSize: CGSize{
let items: NSInteger = self.collectionView?.numberOfItems(inSection: 0) ?? 0
var pages: NSInteger?
if items % 10 == 0 {
pages = items / 10;
}else{
pages = items / 10 + 1
}
return CGSize.init(width: (self.collectionView?.frame.width ?? 0 ) * CGFloat.init(pages ?? 0), height:0)
}
4）重写layoutAttributesForElements(in rect: CGRect)
override func layoutAttributesForElements(in rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
let array: NSMutableArray = NSMutableArray.init()
for att:UICollectionViewLayoutAttributes in self.attArray as! [UICollectionViewLayoutAttributes]{
if rect.intersects(att.frame){
array.add(att)
}
}
return array as? [UICollectionViewLayoutAttributes]
}
实现下滑退出功能，是在touchesMoved里获取手指滑动的竖向距离，来改变self.view的frame，然后判断frame.maxY是否大于临界值，大于临界值就退出，小于临界值就恢复原样。在self.view上添加了UICollectionView，手指放在UICollectionView，touchesMoved函数无响应，所以就出现了手指在UICollectionView上无法竖向滑动的问题
1）为了解决这个问题，首先想到了让UICollectionView的touchesMoved传递到self.view层，让self.view层的touchesMoved有响应
extension UICollectionView{
open override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
print("touchesMoved")
self.next?.next?.next?.touchesMoved(touches, with: event)
}
}
这样做发现有一个问题，当手指头滑出了UICollectionView， UICollectionView的touchesMoved就不再响应，self.view层的touchesMoved也不响应，滑动效果就会丧失，体验效果不好，所以这个方案不行
2）为了解决第一种方案的问题，就在第一种上面进行了优化。当手指滑出了UICollectionView，就让self.view直接响应
override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
if point.y > self.frame.height || point.y < 0{
return self.next?.next?.next as? UIView
}
return super.hitTest(point, with: event)
}
这种方法虽然解决了第一种方案问题，但是动画效果不是特别理想
3）全部否决第一种，第二种方案，在UICollectionView的父视图上添加一个手势，如果手势在UICollectionView上，就根据手势的偏移量，来进行动画，如果在self.view上，就根据touchesMoved的偏移量进行动画(注：手势响应和touchesMoved，不会冲突)
let panGes: UIPanGestureRecognizer = UIPanGestureRecognizer.init(target: self, action: #selector(panGestureAction(panGes:)))
panGes.delegate = self
self.addGestureRecognizer(panGes)
只有在 point.y / point.x > 1.5时，才让手势进行响应
// MARK: - UIGestureRecognizerDelegate
func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool{
if gestureRecognizer.isKind(of: UIPanGestureRecognizer.classForCoder()) {
let point: CGPoint = (gestureRecognizer as! UIPanGestureRecognizer).translation(in: self)
if point.y / point.x > 1.5{
return true
}
}
return false
}
手势响应的处理
// MARK: - ConsumeTypeViewDelegate
func consumeTypeViewPanGesture(ges: UIPanGestureRecognizer) {
switch ges.state {
case .changed:
let point: CGPoint = ges.translation(in: self.view)
movement(value: point.y, type: MovementSpaceType.pointY)
break
case .ended:
movementEnd()
break
default: break
}
}
touchMoved的响应处理
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
for touch: UITouch in touches {
let length: CGFloat = touch.location(in: UIApplication.shared.delegate?.window ?? UIView.init()).y - touch.previousLocation(in: UIApplication.shared.delegate?.window ?? UIView.init()).y
movement(value: length, type: MovementSpaceType.increasingY)
}
}
func getHostView() -> UIView {
var hostView: UIView?
var containerView: UIView?
let windowsArray = UIApplication.shared.windows
for window: UIWindow in windowsArray {
let subArray = window.subviews
for view: UIView in subArray {
if view.description.hasPrefix("<UIInputSetContainerView"){
containerView = view
break
}
}
}
hostView = containerView?.subviews.first
return hostView ?? UIView.init()
}
这里只是记录一下在项目中遇到的问题，及解决方案的思考
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