I'm trying to play a reorder animation that should be called by the methods below, I guess
func tableView(_ tableView: UITableView, canMoveRowAt indexPath: IndexPath) -> Bool {
true
}
func tableView(_ tableView: UITableView, moveRowAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {
}
But for some reason, no animation followed. Most likely, I missed something, how exactly to trigger the animation of changing the order of the cells.
I found the missing component. The reason for which the animation of moving cells did not start. It's the lack of a setting:
tableView.isEditing = true
Related
I am currently working on a solution where I need to have a UITableView by default in reorder mode without having a delete button but could enable the delete button when necessary. I am just curious if this is even achievable in iOS? If so what should be my approach for this?
In my opinion your table view should always be in edit mode.
To make the reorder controls appear you should implement UITableViewDataSource methods
tableView(_ tableView: UITableView, canMoveRowAt indexPath: IndexPath) -> Bool
and
tableView(_ tableView: UITableView, moveRowAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath)
If you don't want the delete button to be displayed you can do that by implementing
tableView(_ tableView: UITableView, editingStyleForRowAt indexPath: IndexPath) -> UITableViewCell.EditingStyle
and return .none by default or .delete when you want to have the button displayed.
I am writing an iOS app.
User types in movie search keywords and it fetches data from omdbapi.com and displays movies in tableview.
Issue is that that table view cell isn't getting displayed correctly.
Project URL:
project on onedrive
I tried using every autolayout method but, its not working.
override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return UITableViewAutomaticDimension;
}
You need to set estimate method for table height too. so place these method for height calculation and also check your cell constraint.
func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
return UITableViewAutomaticDimension
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return UITableViewAutomaticDimension
}
Hope this will help you.
I have implemented two custom cells in the tableview.Now I want to replace these two custom cells with one another. How to achieve this?
Implement following tableview methods and write your code in it
func tableView(_ tableView: UITableView, canMoveRowAt indexPath: IndexPath) -> Bool {
// return boolean value for a specific or all cells, you want to enable movement
}
func tableView(_ tableView: UITableView, moveRowAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {
// Handle array element movement along with your row/cell
}
Share your full source code better help
If you would like to reorder rows in UITableView. Take a look at two delegates that are implemented in the UITableView.
They are: tableView:canMoveRowAtIndexPath: and moveRowAtIndexPath:toIndexPath:.
Also take a look at tutorial that show how it is possible to implement.
Along with tableview delegates, use moveRow(at: <IndexPath>, to: <IndexPath>), to move your row programatically (automatically), without user interaction.
tblTabel.moveRow(at: <IndexPath>, to: <IndexPath>)
// Tableview Delegates
func tableView(_ tableView: UITableView, canMoveRowAt indexPath: IndexPath) -> Bool {
// return boolean value for a specific or all cells, you want to enable movement
}
func tableView(_ tableView: UITableView, moveRowAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {
// Handle array element movement along with your row/cell
}
I have some questions with Swift 3 function calling. Below is an example.
Old Swift:
func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell
Swift 3:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
That's fine with the above syntax. But now Xcode shows me an error and asks me to do like below:
#objc(tableView:cellForRowAtIndexPath:) func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
I do not understand why I have to declare #objc(tableView:cellForRowAtIndexPath:).
This is happening only when I am trying to implement table view datasource methods under an extension. Also this is not happening for numberOfRowsInSection or viewForHeaderInSection.
Can anyone help me to understand why this is happening?
While I am not sure what triggers the #objc, I can suggest the following approach:
Store the tableView variable somewhere in the viewDidLoad:
let tv = tableView!
Then hover over the tableView variable and press the command button in conjunction with a click.
This should take you to the interface of a UITableView.
Then, hover over either UITableViewDelegate or UITableViewDataSource and press the command button in conjunction with a click.
Now you can see the new signatures.
A lot has changed...Happy upgrade!
Swift compiler forced to write Objc(funcName) before function if you are using this function from Objective c. According to app doc
Use the #objc(name) attribute to provide Objective-C names for
properties and methods when necessary. For example, you can mark a
property called enabled to have a getter named isEnabled in
Objective-C like this:
var enabled: Bool {
#objc(isEnabled) get {
// ...
}
}
To void this, use extension to write TableView Datasource and delegate
extension YourViewControllerName:UITableViewDataSource, UITableViewDelegate {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
return 10
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell{
let cell = tableView.dequeueReusableCell() as SplitAddContactCell
return cell
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 80.0
}
}
I am trying to learn Swift, but there is a problem in my project that drives me nuts.
I have a working list of data in a ViewController fed by parse.com. I managed to implement a swipe-feature that reveals buttons for both deleting and editing. That is working fine. Now I want the user to be able to reorder the cells. So I successfully implemented a button to put the table into editing-mode. My 2 problems with that are:
When I enter edit-mode I just want to be able to reorder the cells since editing and deleting is done via swipe (via "tableView(tableView: UITableView, editActionsForRowAtIndexPath indexPath: NSIndexPath)". How can I achive that the user doesn't see the 2 buttons for deleting and editing when in editing-mode and touching the delete-circle that is provided automatically?
Is it possible to remove the delete-circle altogether? Using "UITableViewCellEditingStyle.None" also disables the swipe-functionality.
Thanks in advance!
To avoid the round red delete button that appears when you put set UITableView isEditing to true at the left and does nothing when you click it, the minimum that worked for me was this (Swift 4, iOS 11)
// Avoid the round red delete button on the left of the cell:
func tableView(_ tableView: UITableView, shouldIndentWhileEditingRowAt indexPath: IndexPath) -> Bool {
return false
}
func tableView(_ tableView: UITableView, editingStyleForRowAt indexPath: IndexPath) -> UITableViewCellEditingStyle {
return .none
}
I also have these functions, which probably interact:
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return savedTempTable.isEditing
}
// Including this function in the delegate enable left-swipe deleting
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath)
{
if editingStyle == .delete {
savedConversions.remove(at: indexPath.row)
}
}
// Including this function enables reordering
func tableView(_ tableView: UITableView, moveRowAt sourceIndexPath: IndexPath,to destinationIndexPath: IndexPath)
{
let elem = savedConversions.remove(at: sourceIndexPath.row)
savedConversions.insert(elem, at: destinationIndexPath.row)
}
override func tableView(_ tableView: UITableView, editingStyleForRowAt indexPath: IndexPath) -> UITableViewCellEditingStyle {
return .none
}
override func tableView(_ tableView: UITableView, shouldIndentWhileEditingRowAt indexPath: IndexPath) -> Bool {
return false
}
Although people can delete a row through swipe the delete-button in editing mode should not be removed. People may not know about the swipe gesture and by removing the delete button (which they already expect in editing mode) the app becomes more difficult to use.
If you really want to remove the delete button then you have to implement the delegate method tableView(_:editingStyleForRowAtIndexPath:). There you can return .None while the screen is in editing mode and .Delete while the screen is not.
To enable reordering you have to implement the data source methods tableView(_:canMoveRowAtIndexPath:) and tableView(_:moveRowAtIndexPath:toIndexPath:).
You follow this way to remove the delete Icon while editing:
-(UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath{
return UITableViewCellAccessoryNone;
}