ios 在tableview单元格中选择更改图像 - Swift
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Change image on select within tableview cell - Swift
提问by Katie H
I am trying to change an image within a cell when it is selected. Here is what I have in my view controller:
我试图在选择单元格时更改单元格中的图像。这是我的视图控制器中的内容：
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
let cell = self.tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! CustomTableViewCell
cell.bgImage.image = UIImage(named: "second_image")
}
This is where I set the image:
这是我设置图像的地方：
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = self.tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! CustomTableViewCell
cell.bgImage.image = UIImage(named: "first_image")
}
When I select the cell, the image does not update. How do I get this to work?
当我选择单元格时，图像不会更新。我如何让这个工作？
回答by Leejay Schmidt
The issue is probably that you are calling dequeueReusableCellWithIdentifier. Try using cellForRowAtIndexPathinstead (documentation about it here). This will give you a reference to the current cell, rather than a reference to a new reusable cell.
问题可能是您正在调用dequeueReusableCellWithIdentifier. 尝试cellForRowAtIndexPath改用（有关它的文档here）。这将为您提供对当前单元格的引用，而不是对新的可重用单元格的引用。
So, according to your code above:
所以，根据你上面的代码：
let cell = self.tableView.cellForRowAtIndexPath(indexPath) as! CustomTableViewCellThis typecast is criticalbecause cellForRowAtIndexPathreturns UITableViewCell, which will not have the bgImagemember.
这个类型转换很关键，因为cellForRowAtIndexPath返回UITableViewCell，它不会有bgImage成员。
Also, make sure that you have a member called bgImagethat is a UIImageViewin your CustomTableViewCellclass by adding @IBOutlet strong var bgImage: UIImageView!, and that said IBOutletis connected in your storyboard/xib.
此外，请确保您有一个名为成员bgImage是一个UIImageView在你的CustomTableViewCell类加入@IBOutlet strong var bgImage: UIImageView!，并且所述IBOutlet连接在你的情节提要/厦门国际银行。
回答by Paul Razvan Berg
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
let cell = tableView.cellForRowAtIndexPath(indexPath) as! CustomTableViewCell
cell.bgImage.image = UIImage(named: "second_image")}
For Swift 3+:
对于 Swift 3+：
func tableView(tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let cell = tableView.cellForRow(at: indexPath) as! CustomTableViewCell
cell.bgImage.image = UIImage(named: "second_image")}
回答by Mr. Tann
Though it is too late. But i like to answer to participate in this world. I was having problem with changing selected and deselected cell image of a table view. I solved it this way. When tableview delegate method call then create instance of that cell by
虽然为时已晚。但我喜欢回答参与这个世界。我在更改表格视图的选定和取消选定的单元格图像时遇到问题。我是这样解决的。当 tableview 委托方法调用然后创建该单元格的实例时
let cell = self.tableView.cellForRow(at: indexPath) as! CustomeCell
instead of
代替
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! CustomeCell
and use your desired image into your cell imageview.
并将您想要的图像使用到您的单元格图像视图中。
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let cell = self.tableView.cellForRow(at: indexPath) as! CustomeCell
if indexPath.row == 0
cell.btnImageView.image = UIImage.init(named: "screenr.png")
}
override func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
let cell = self.tableView.cellForRow(at: indexPath) as! CustomeCell
if indexPath.row == 0
cell.btnImageView.image = UIImage.init(named: "screen.png")
}
回答by Rashwan L
Change your didSelectRowAtIndexPathto:
将您更改didSelectRowAtIndexPath为：
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
let cell = tableView.cellForRowAtIndexPath(indexPath)
cell.bgImage.image = UIImage(named: "second_image")
}
As per default this works to change the image
默认情况下，这可以更改图像
let cell = tableView.cellForRowAtIndexPath(indexPath)
cell!.imageView?.image = UIImage(named: "2")
回答by Zachary Fisher
Can't you simply use the .hightlightedimage value for the imageView? I'm doing the following in my cellForRowAt func:
你不能简单地为 imageView 使用 .hightlightedimage 值吗？我在 cellForRowAt 函数中执行以下操作：
cell.imageView?.image = UIImage(named: "\(indexPath.row).png")
cell.imageView?.highlightedImage = UIImage(named: "\(indexPath.row)g.png")
And I've just named the necessary images "0.png" and "0g.png" etc to make sure the image and highlighted image match up. Of course, that's a small static array, if you were using coreData with a larger array you could simply hold the imageName and the hightlightedImageName in the data set and pull the info from there.
我刚刚将必要的图像命名为“0.png”和“0g.png”等，以确保图像和突出显示的图像匹配。当然，这是一个小的静态数组，如果您将 coreData 与更大的数组一起使用，您可以简单地在数据集中保存 imageName 和 hightlightedImageName 并从那里提取信息。
