I. Overview
This article mainly introduces the content:
- Add a delete button on the right side of the navigation bar (there is an add button)
- Click the delete button to delete the tableview entry
- Call before tableview editing, switch the editing mode in tableview (add, delete mode)
Two renderings
Add a delete button to the right of the three navigation bar (there is an add button)
3.1 Add through Main.storyboard
-
Click "+" at the top of Xcode, select BarButtonItem, and select Trash for System item
3.2 Add by code
Business logic
- Now get the "add" button in the layout
- Create a "delete" button through code
- Add the above two buttons through aviationItem.rightBarButtonItems
Code
1 2 3 4 5 6 |
//Get + button UIBarButtonItem *add=self.navigationItem.rightBarButtonItem; //Add a trash can button UIBarButtonItem *trash=[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemTrash target:self action:@selector(delete)]; self.navigationItem.rightBarButtonItems=@[add,trash]; |
Four click the delete button to delete the tableview entry
4.1 Logic Description
- Set the edit mode for the tableview, when you click the delete button, switch the edit mode of the tableview
- When the editing mode is delete, the commitEditingStyle method will be called to update the data and layout operations
4.2 Code implementation
delete method
1 |
[self.tableView setEditing:!self.tableView.editing animated:YES]; |
commitEditingStyle
1 2 3 4 5 |
//delete data [self.contacts removeObjectAtIndex:indexPath.row]; //Refresh the interface //[self.tableView reloadData];//Global refresh [self.tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationLeft];//删除局部 |
Five switch the editing mode in the tableview (add, delete mode)
5.1 Logic description
- The tableview will call the editingStyleForRowAtIndexPath method before editing, which can set the style for the entries in the tableview
- For example, entry 0 is UITableViewCellEditingStyleInsert, the others are UITableViewCellEditingStyleDelete
- Add the corresponding function to the corresponding style
5.2 Code implementation
editingStyleForRowAtIndexPath
1 2 3 4 5 6 7 |
- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath
{
if (indexPath.row==0) {
return UITableViewCellEditingStyleInsert;
}
return UITableViewCellEditingStyleDelete;
}
|
UITableViewCellEditingStyleInsert
1 2 3 4 |
Contact *contact=[Contact contactWithName:@"grace" phone:@"123"]; //[self.contacts addObject:contact];//Add to the last line [self.contacts insertObject:contact atIndex:indexPath.row+1]; [self.tableView reloadData]; |