tableview的代理方法

-(void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle) forRowAtIndexPath:(NSIndexPath *)indexPath  
{  
    if (editingStyle==UITableViewCellEditingStyleDelete) {  
//        获取选中删除行索引值  
        NSInteger row = [indexPath row];  
//        通过获取的索引值删除数组中的值  
        [self.listData removeObjectAtIndex:row];  
//        删除单元格的某一行时，在用动画效果实现删除过程  
        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];  
    }  
}  

#pragma mark -- cell左滑动退出编辑
//设cell可编辑
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath{
    
    return YES;
    
}
//定义编辑样式
- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath{
    //    [tableView setEditing:YES animated:YES];
    return UITableViewCellEditingStyleDelete;
    
}
//修改编辑按钮的文字
- (NSString *)tableView:(UITableView *)tableView titleForDeleteConfirmationButtonForRowAtIndexPath:(NSIndexPath *)indexPath{
    return @"退出";
}
//进入编辑模式，点击出现的编辑按钮后
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath{
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        
        UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示" message:@"你确定退出该编辑？" preferredStyle:UIAlertControllerStyleAlert];
        //        [alertController addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil]];
        [alertController addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) {
            //
            [_classArray removeObjectAtIndex:indexPath.row];
            [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
            
        }]];
        
        [self presentViewController:alertController animated:YES completion:nil];
    }
    
    
    
    
}