我在tableView
自定义cell
中遇到了一个奇怪的问题。对于类似图片操作,我在自定义cell
中编写了这些代码,名为FeedViewCell
:
self.like.isUserInteractionEnabled = true
let CommenttapGestureRecognizer = UITapGestureRecognizer(target:self, action:#selector(likehandleTap))
self.like.addGestureRecognizer(CommenttapGestureRecognizer)
func likehandleTap(_ sender: UITapGestureRecognizer) {
if self.like.image == UIImage(named: "like-btn-inactive") {
self.like.image = UIImage(named: "like-btn-active")
} else {
self.like.image = UIImage(named: "like-btn-inactive")
}
}
和TableViewController:
func tableView(_ tableView: UITableView, cellForRowAtIndexPath indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "FeedCell", for: indexPath) as! FeedViewCell
return cell
}
但正如您在this视频中看到的那样,当我触摸索引0中的like按钮并更改图像时,索引3中的like按钮也会更改图像。你能告诉我我的错误吗?
感谢
答案 0 :(得分:3)
尝试使用100%的代码
var selectindex : Int?
var selectedindex : NSMutableArray = NSMutableArray()
@IBOutlet var tableview: UITableView!
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("LikeCell", forIndexPath: indexPath)
let like: UIButton = (cell.viewWithTag(2) as! UIButton)
let comment: UIButton = (cell.viewWithTag(3) as! UIButton)
if selectedindex.containsObject(indexPath.row) {
like.setBackgroundImage(UIImage.init(named: "like.png"), forState: .Normal)
}else{
like.setBackgroundImage(UIImage.init(named: "like (1).png"), forState: .Normal)
}
comment.setBackgroundImage(UIImage(named: "chat.png"), forState: UIControlState.Normal)
like.addTarget(self, action: #selector(self.CloseMethod(_:event:)), forControlEvents: .TouchDown)
comment.addTarget(self, action: #selector(self.CloseMethod1(_:event:)), forControlEvents: .TouchDown)
return cell
}
@IBAction func CloseMethod(sender: UIButton, event: AnyObject) {
let touches = event.allTouches()!
let touch = touches.first!
let currentTouchPosition = touch.locationInView(self.tableview)
let indexPath = self.tableview.indexPathForRowAtPoint(currentTouchPosition)!
selectindex = indexPath.row
if selectedindex.containsObject(selectindex!) {
selectedindex.removeObject(selectindex!)
}else{
selectedindex.addObject(selectindex!)
}
self.tableview.reloadData()
}
答案 1 :(得分:0)
拿一个阵列
let arr : NSMutableArray = NSMutableArray()
在tableview中取按钮代替图像并设置与按钮中的图像不同,并设置图像而不是我的图像
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 10
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath)
let btn = cell.viewWithTag(10) as! UIButton
btn.addTarget(self, action: #selector(ViewController.connected(_:)), forControlEvents: .TouchUpInside)
return cell
}
func connected(sender: UIButton){
let buttonposition = sender.convertPoint(CGPointZero, toView: self.tblview)
let index = self.tblview.indexPathForRowAtPoint(buttonposition)
if !arr.containsObject((index?.row)!) {
arr.addObject((index?.row)!)
sender.setImage(UIImage(named: "ic_check.png"), forState: .Normal)
}else
{
arr.removeObject((index?.row)!)
sender.setImage(UIImage(named: "ic_uncheck.png"), forState: .Normal)
}
}
答案 2 :(得分:0)
这就是为什么要更改imageView
中加载的图片然后使用方法tableView.dequeueReusableCell
,您正在重新使用带有更改图像的单元格。
在iOS UITableView
和UICollectionView
中应用可重复使用的单元格的概念。他们不为阵列的每个元素创建一个单元格;他们只创建了3-4个单元格,然后他们只需更改内部内容即可重复使用它。这是一件好事,因为它允许开发人员创建包含数百行的表而不会出现内存问题。
以下是tableView
(以及collectionView
)显示元素数组的步骤:
要解决您的问题,您只需在cellForRowAtIndexPath
示例:
func tableView(_ tableView: UITableView, cellForRowAtIndexPath indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "FeedCell", for: indexPath) as! FeedViewCell
let model = arrayOfElements[indexPath.row]
if model.isLiked {
cell.like.image == UIImage(named: "like-btn-active")
} else {
cell.like.image == UIImage(named: "like-btn-active")
}
return cell
}