iOS 删除 tableview 行

iOS delete a tableview row

提问by diogo.appDev

I had my app working fine on iOS 6. With the upgrade I stopped being able to delete rows from my UITableView.

我的应用程序在 iOS 6 上运行良好。升级后，我无法从我的UITableView.

I've a button in my prototype cell.

我的原型单元格中有一个按钮。

Here is the button's function:

这是按钮的功能：

- (IBAction)deleteCell:(id)sender {
    UIButton *btn = (UIButton*) sender;
    UITableViewCell *cell = (UITableViewCell*) btn.superview.superview;
    NSIndexPath *indexPath = [_tableView indexPathForCell:cell];
    if([names count] > 9) {
        int index = indexPath.row;
        [names removeObjectAtIndex:index];
        [photos removeObjectAtIndex:index];
        [_tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationRight];
    } 
} 

The problem is my index variable is always 0.

问题是我的索引变量始终为 0。

I tried another solution:

我尝试了另一种解决方案：

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {

        if (editingStyle == UITableViewCellEditingStyleDelete) {
            int index = indexPath.row;
            [names removeObjectAtIndex:index];
            [photos removeObjectAtIndex:index];
            [_tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationRight];

}
}

This solution doesn't work either. Nothing happens when I swipe right.

此解决方案也不起作用。当我向右滑动时什么也没有发生。

回答by Ravindhiran

Try this sample tutorial,

试试这个示例教程，

ViewController.h

视图控制器.h

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController<UITableViewDelegate,UITableViewDataSource>
{
  NSMutableArray *arryData1;
  NSMutableArray *arryData2;
  IBOutlet UITableView *tableList;
}

@end

ViewController.m

视图控制器.m

#import "ViewController.h"

@interface ViewController ()

 @end

@implementation ViewController

-(void)viewDidLoad
{
[super viewDidLoad];

arryData1 = [[NSMutableArray alloc] initWithObjects:@"MCA",@"MBA",@"BTech",@"MTech",nil];
arryData2 = [[NSMutableArray alloc] initWithObjects:@"Objective C",@"C++",@"C#",@".net",nil];
tableList.editing=YES;

}

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [arryData1 count];
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier= @"Cell";

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier] ;
}
cell.textLabel.text = [arryData1 objectAtIndex:indexPath.row];
cell.detailTextLabel.text = [arryData2 objectAtIndex:indexPath.row];
return cell;
}

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {

if (editingStyle == UITableViewCellEditingStyleDelete) {
    int index = indexPath.row;
    [arryData1 removeObjectAtIndex:index];
    [arryData2 removeObjectAtIndex:index];

    [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath]
                     withRowAnimation:UITableViewRowAnimationFade];


}
}

- (UITableViewCellEditingStyle)tableView:(UITableView *)aTableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath
{
if (tableList.editing)
{
    return UITableViewCellEditingStyleDelete;
}

return UITableViewCellEditingStyleNone;
}

- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
return YES;
}

回答by mert

I quess the problem is you're not reloading data again thus it's staying in cache memory

我问问题是你没有再次重新加载数据，因此它留在缓存中

You can try to reload data with [tableView reloadData];this method to the below of [_tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationRight]; this code line in your second solution.

您可以尝试使用[tableView reloadData];此方法将数据重新加载到[_tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationRight]; 第二个解决方案中此代码行的下方 。

回答by James L

Use the tableview commiteditingstyle method to delete a cell/row of the tableviewcontroller.

使用 tableview commiteditingstyle 方法删除 tableviewcontroller 的单元格/行。

Here is the workable code snip:

这是可行的代码片段：

-(void) tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath

{

    [ArrayHoldsCellObj removeObjectAtIndex:indexPath.row];

    [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
}

Note that the ArrayHoldsCellObjis the Array object you must declare and assign each cell to the area index.

请注意，ArrayHoldsCellObj您必须声明 Array 对象并将每个单元格分配给区域索引。

回答by Adnan Aftab

To show delete button on cell swipe you must implement this delegate method.

要在单元格滑动时显示删除按钮，您必须实现此委托方法。

- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
    // Return YES if you want the specified item to be editable.
    return YES;
}

Try this, i hope this will work for you.

试试这个，我希望这对你有用。

回答by Judy

You can set the button tag = cell.indexin cellForRowAtIndexPath.

您可以设置按钮tag = cell.index在cellForRowAtIndexPath。

And then

进而

UITableViewCell *cell = (UITableViewCell *)
        [tableView cellForRowAtIndexPath:
        [NSIndexPath indexPathForRow:btn.tag inSection:0]];

so you can get the index

所以你可以得到索引

回答by Rahul K Rajan

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
if (editingStyle == UITableViewCellEditingStyleDelete) {
//add code here for when you hit delete
[dataSourceArray removeObjectAtIndex:indexPath.row];
[tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];

}    
}