http://www.itnose.net/news/155/6429874
这是一个完全依靠手势的操作ToDoList的演示,功能上左划删除,右划完成任务,拖拽调整顺序,捏合张开插入。
项目源码: https://github.com/luan-ma/ClearStyleDemo.Swift
初始化
TDCToDoItem.swift 定义模型对象
TDCToDoListController.swift 继承自UITableViewController, 演示UITableView操作
- varitems=[
- TDCToDoItem(text:"Feedthecat"),TDCToDoItem(text:"Buyeggs"),TDCToDoItem(text:"PackbagsforWWDC"),TDCToDoItem(text:"Ruletheweb"),TDCToDoItem(text:"BuyanewiPhone"),TDCToDoItem(text:"Findmissingsocks"),TDCToDoItem(text:"Writeanewtutorial"),TDCToDoItem(text:"MasterObjective-C"),TDCToDoItem(text:"Rememberyourweddinganniversary!"),TDCToDoItem(text:"Drinklessbeer"),TDCToDoItem(text:"Learntodraw"),TDCToDoItem(text:"Takethecartothegarage"),TDCToDoItem(text:"SellthingsoneBay"),TDCToDoItem(text:"Learntojuggle"),TDCToDoItem(text:"Giveup")
- ]
- overridefuncviewDidLoad(){
- super.viewDidLoad()
- //捏合手势
- letpinch=UIPinchGestureRecognizer(target:self,action:"handlePinch:")
- //长按拖拽
- letlongPress=UILongPressGestureRecognizer(target:self,action:"handleLongPress:")
- tableView.addGestureRecognizer(pinch)
- tableView.addGestureRecognizer(longPress)
- }
左划删除、右划完成
在每一个Cell添加滑动手势(Pan)。处理划动距离,超过宽度1/3就为有效操作,左划为删除操作,右划为完成操作。
布局使用AutoLayout,中间内容区的限制条件是宽度等于容器宽度、高度等于容器高度、垂直中对齐、水平中对齐,而平移操作实际上就是操作水平中对齐的距离值。
TDCToDoItemCell.swift关键代码如下
手势判断
- //如果是划动手势,仅支持左右划动;如果是其它手势,则有父类负责
- overridefuncgestureRecognizerShouldBegin(gestureRecognizer:UIGestureRecognizer)->Bool{
- ifletpanGesture=gestureRecognizeras?UIPanGestureRecognizer{
- lettranslation=panGesture.translationInView(self.superview)
- returnfabs(translation.x)>fabs(translation.y)
- }else{
- returnsuper.gestureRecognizerShouldBegin(gestureRecognizer)
- }
- }
手势操作
- varonDelete:((TDCToDoItemCell)->Void)?
- varonComplete:((TDCToDoItemCell)->Void)?
- privatevardeleteOnDragRelease:Bool=false
- privatevarcompleteOnDragRelease:Bool=false
- //划动平移的实际AutoLayout中的水平中对齐的距离
- @IBOutletweakvarcenterConstraint:NSLayoutConstraint!
- privatevaroriginConstant:CGFloat=0
- funchandlePan(panGesture:UIPanGestureRecognizer){
- switchpanGesture.state{
- case.Began:
- originConstant=centerConstraint.constant
- case.Changed:
- lettranslation=panGesture.translationInView(self)
- centerConstraint.constant=translation.x
- //划动移动1/3宽度为有效划动
- letfinished=fabs(translation.x)>CGRectGetWidth(bounds)/3
- iftranslation.x<originConstant{//右划
- iffinished{
- deleteOnDragRelease=true
- rightLabel.textColor=UIColor.redColor()
- }else{
- deleteOnDragRelease=false
- rightLabel.textColor=UIColor.whiteColor()
- }
- }else{//左划
- iffinished{
- completeOnDragRelease=true
- leftLabel.textColor=UIColor.greenColor()
- }else{
- completeOnDragRelease=false
- leftLabel.textColor=UIColor.whiteColor()
- }
- }
- case.Ended:
- centerConstraint.constant=originConstant
- ifdeleteOnDragRelease{
- deleteOnDragRelease=false
- ifletonDelete=onDelete{
- onDelete(self)
- }
- }
- ifcompleteOnDragRelease{
- completeOnDragRelease=false
- ifletonComplete=onComplete{
- onComplete(self)
- }
- }
- default:
- break
- }
- }
在TDCToDoListController.swift中执行删除操作
- /*
- //简单删除
- funcdeleteToDoItem(indexPath:NSIndexPath){
- tableView.beginUpdates()
- items.removeAtIndex(indexPath.row)
- tableView.deleteRowsAtIndexPaths([indexPath],withRowAnimation:.Automatic)
- tableView.endUpdates()
- }
- */
- //视觉效果更漂亮的删除
- funcdeleteToDoItem(indexPath:NSIndexPath){
- letitem=items.removeAtIndex(indexPath.row)
- varanimationEnabled=false
- letlastCell=tableView.visibleCells.last
- vardelay:NSTimeInterval=0
- forcellintableView.visibleCells{
- letcell=cellas!TDCToDoItemCell
- ifanimationEnabled{
- UIView.animateWithDuration(0.25,delay:delay,options:.CurveEaseInOut,animations:{()->Voidin
- cell.frame=CGRectOffset(cell.frame,-CGRectGetHeight(cell.frame))
- },completion:{(completed)->Voidin
- ifcell==lastCell{
- self.tableView.reloadData()
- }
- })
- delay+=0.03
- }
- ifcell.toDoItem==item{
- animationEnabled=true
- cell.hidden=true
- }
- }
- }
拖拽排序
长按选中某Cell,截图此Cell生成UIImageView,然后隐藏此Cell(hidden=true),随手指移动拖拽UIImageView,每次拖拽到一个Cell上的时候,交换当前Cell和隐藏Cell位置。效果如下
截图UIView生成一个新的UIImageVIew
- funcsnapView(view:UIView)->UIImageView{
- UIGraphicsBeginImageContextWithOptions(view.bounds.size,false,0)
- view.layer.renderInContext(UIGraphicsGetCurrentContext()!)
- letimage=UIGraphicsGetImageFromCurrentImageContext()
- UIGraphicsEndImageContext()
- letsnapShot=UIImageView(image:image)
- snapShot.layer.masksToBounds=false;
- snapShot.layer.cornerRadius=0;
- snapShot.layer.shadowOffset=CGSizeMake(-5.0,0.0);
- snapShot.layer.shadowOpacity=0.4;
- snapShot.layer.shadowRadius=5;
- snapShot.frame=view.frame
- returnsnapShot
- }
拖拽操作代码,详细操作参考注释
- privatevarsourceIndexPath:NSIndexPath?
- privatevarsnapView:UIView?
- funchandleLongPress(longPress:UILongPressGestureRecognizer){
- letpoint=longPress.locationInView(tableView)
- ifletindexPath=tableView.indexPathForRowAtPoint(point){
- switchlongPress.state{
- case.Began:
- ifletcell=tableView.cellForRowAtIndexPath(indexPath){
- sourceIndexPath=indexPath
- letsnapView=self.snapView(cell)
- snapView.alpha=0
- self.snapView=snapView
- tableView.addSubview(snapView)
- UIView.animateWithDuration(0.25,animations:{
- //选中Cell跳出放大效果
- snapView.alpha=0.95
- snapView.center=CGPointMake(cell.center.x,point.y)
- snapView.transform=CGAffineTransformMakeScale(1.05,1.05)
- cell.alpha=0
- },completion:{(completed)->Voidin
- cell.hidden=true
- cell.alpha=1
- })
- }else{
- sourceIndexPath=nil
- snapView=nil
- break
- }
- case.Changed:
- ifletsnapView=snapView{
- //截图随手指上下移动
- snapView.center=CGPointMake(snapView.center.x,point.y)
- }
- //如果手指移动到一个新的Cell上面,隐藏Cell跟此Cell交换位置
- ifletfromIndexPath=sourceIndexPath{
- iffromIndexPath!=indexPath{
- tableView.beginUpdates()
- lettemp=items[indexPath.row]
- items[indexPath.row]=items[fromIndexPath.row]
- items[fromIndexPath.row]=temp
- tableView.moveRowAtIndexPath(fromIndexPath,toIndexPath:indexPath)
- tableView.endUpdates()
- sourceIndexPath=indexPath
- }
- }
- //手指移动到屏幕顶端或底部,UITableView自动滚动
- letstep:CGFloat=64
- ifletparentView=tableView.superview{
- letparentPos=tableView.convertPoint(point,toView:parentView)
- ifparentPos.y>parentView.bounds.height-step{
- varoffset=tableView.contentOffset
- offset.y+=(parentPos.y-parentView.bounds.height+step)
- ifoffset.y>tableView.contentSize.height-tableView.bounds.height{
- offset.y=tableView.contentSize.height-tableView.bounds.height
- }
- tableView.setContentOffset(offset,animated:false)
- }elseifparentPos.y<=step{
- varoffset=tableView.contentOffset
- offset.y-=(step-parentPos.y)
- ifoffset.y<0{
- offset.y=0
- }
- tableView.setContentOffset(offset,animated:false)
- }
- }
- default:
- ifletsnapView=snapView,letfromIndexPath=sourceIndexPath,letcell=tableView.cellForRowAtIndexPath(fromIndexPath){
- cell.alpha=0
- cell.hidden=false
- //长按移动结束,隐藏的Cell恢复显示,删除截图
- UIView.animateWithDuration(0.25,animations:{()->Voidin
- snapView.center=cell.center
- snapView.alpha=0
- cell.alpha=1
- },completion:{[unownedself](completed)->Voidin
- snapView.removeFromSuperview()
- self.snapView=nil
- self.sourceIndexPath=nil
- self.tableView.performSelector("reloadData",withObject:nil,afterDelay:0.5)
- })
- }
- }
- }
- }
捏合张开插入
通过捏合手势中两个触点获取两个相邻的Cell,通过修改UIView.transform属性移动屏幕上的Cell位置。
- funcpointsOfPinch(pinch:UIPinchGestureRecognizer)->(CGPoint,CGPoint){
- ifpinch.numberOfTouches()>1{
- letpoint1=pinch.locationOfTouch(0,inView:tableView)
- letpoint2=pinch.locationOfTouch(1,inView:tableView)
- ifpoint1.y<=point2.y{
- return(point1,point2)
- }else{
- return(point2,point1)
- }
- }else{
- letpoint=pinch.locationOfTouch(0,inView:tableView)
- return(point,point)
- }
- }
- //插入点
- privatevarpinchIndexPath:NSIndexPath?
- //临时代理视图
- privatevarplacheHolderCell:TDCPlaceHolderView?
- //两触点的起始位置
- privatevarsourcePoints:(upperPoint:CGPoint,downPoint:CGPoint)?
- //可以插入操作的标志
- privatevarpinchInsertEnabled=false
- funchandlePinch(pinch:UIPinchGestureRecognizer){
- switchpinch.state{
- case.Began:
- pinchBegan(pinch)
- case.Changed:
- pinchChanged(pinch)
- default:
- pinchEnd(pinch)
- }
- }
- funcpinchBegan(pinch:UIPinchGestureRecognizer){
- pinchIndexPath=nil
- sourcePoints=nil
- pinchInsertEnabled=false
- let(upperPoint,downPoint)=pointsOfPinch(pinch)
- ifletupperIndexPath=tableView.indexPathForRowAtPoint(upperPoint),letdownIndexPath=tableView.indexPathForRowAtPoint(downPoint){
- ifdownIndexPath.row-upperIndexPath.row==1{
- letupperCell=tableView.cellForRowAtIndexPath(upperIndexPath)!
- letplacheHolder=NSBundle.mainBundle().loadNibNamed("TDCPlaceHolderView",owner:tableView,options:nil).firstas!TDCPlaceHolderView
- placheHolder.frame=CGRectOffset(upperCell.frame,CGRectGetHeight(upperCell.frame)/2)
- tableView.insertSubview(placheHolder,atIndex:0)
- sourcePoints=(upperPoint,downPoint)
- pinchIndexPath=upperIndexPath
- placheHolderCell=placheHolder
- }
- }
- }
- funcpinchChanged(pinch:UIPinchGestureRecognizer){
- ifletpinchIndexPath=pinchIndexPath,letoriginPoints=sourcePoints,letplacheHolderCell=placheHolderCell{
- letpoints=pointsOfPinch(pinch)
- letupperDistance=points.0.y-originPoints.upperPoint.y
- letdownDistance=originPoints.downPoint.y-points.1.y
- letdistance=-min(0,min(upperDistance,downDistance))
- NSLog("distance=\(distance)")
- //移动两边的Cell
- forcellintableView.visibleCells{
- letindexPath=tableView.indexPathForCell(cell)!
- ifindexPath.row<=pinchIndexPath.row{
- cell.transform=CGAffineTransformMakeTranslation(0,-distance)
- }else{
- cell.transform=CGAffineTransformMakeTranslation(0,distance)
- }
- }
- //插入的Cell变形
- letscaleY=min(64,fabs(distance)*2)/CGFloat(64)
- placheHolderCell.transform=CGAffineTransformMakeScale(1,scaleY)
- placheHolderCell.lblTitle.text=scaleY<=0.5?"张开双指插入新项目":"松手可以插入新项目"
- //张开超过一个Cell高度时,执行插入操作
- pinchInsertEnabled=scaleY>=1
- }
- }
- funcpinchEnd(pinch:UIPinchGestureRecognizer){
- ifletpinchIndexPath=pinchIndexPath,letplacheHolderCell=placheHolderCell{
- placheHolderCell.transform=CGAffineTransformIdentity
- placheHolderCell.removeFromSuperview()
- self.placheHolderCell=nil
- ifpinchInsertEnabled{
- //恢复各Cell的transform
- forcellinself.tableView.visibleCells{
- cell.transform=CGAffineTransformIdentity
- }
- //插入操作
- letindex=pinchIndexPath.row+1
- items.insert(TDCToDoItem(text:""),atIndex:index)
- tableView.reloadData()
- //弹出键盘
- letcell=tableView.cellForRowAtIndexPath(NSIndexPath(forRow:index,inSection:0))as!TDCToDoItemCell
- cell.txtField.becomeFirstResponder()
- }else{
- //放弃插入,恢复原位置
- UIView.animateWithDuration(0.25,delay:0,animations:{[unownedself]()->Voidin
- forcellinself.tableView.visibleCells{
- cell.transform=CGAffineTransformIdentity
- }
- },completion:{[unownedself](completed)->Voidin
- self.tableView.reloadData()
- })
- }
- }
- sourcePoints=nil
- pinchIndexPath=nil
- pinchInsertEnabled=false
- }
参考
1. https://github.com/ColinEberhardt/iOS-ClearStyle
2. http://blog.csdn.net/u013604612/article/details/43884039