我正在尝试从我的表视图中删除一行,但到目前为止都没有成功。我一直收到这个错误:
“由于未捕获的异常'NSInternalInconsistencyException‘而终止应用程序,原因:’无效更新:节0中的行数无效。更新后的现有节中包含的行数(5)必须等于更新前该节中包含的行数(5),加上或减去从该节中插入或删除的行数(插入0,删除1)。‘”我用来填充表视图的数组是在该类中声明的,我的数组的对象也是从sqlite db中获取的。
我用来删除行的代码如下所示。
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete the row from the data source
[categoryArray objectAtIndex:indexPath.row];
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:YES];
}
else if (editingStyle == UITableViewCellEditingStyleInsert) {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
现在是我希望得到答案的问题:
-How我能正确删除行吗?
如果这是tableView中唯一剩下的行,-Will我会面临删除的问题吗?
-Can我是否将方法中使用的tableView更改为我在.h文件中声明的UITableView?
非常感谢。
编辑
-Full .m代码
#import "DeleteCategoryTableView.h"
#import "KeyCryptAppAppDelegate.h"
@implementation DeleteCategoryTableView
@synthesize categoryArray;
#pragma mark -
#pragma mark Initialization
-(void) initializeCategoryArray {
sqlite3 *db= [KeyCryptAppAppDelegate getNewDBConnection];
KeyCryptAppAppDelegate *appDelegate = (KeyCryptAppAppDelegate *)[[UIApplication sharedApplication] delegate];
const char *sql = [[NSString stringWithFormat:(@"Select Category from Categories;")]cString];
sqlite3_stmt *compiledStatement;
if (sqlite3_prepare_v2(db, sql, -1, &compiledStatement, NULL)==SQLITE_OK)
{
while(sqlite3_step(compiledStatement) == SQLITE_ROW)
[categoryArray addObject:[NSString stringWithUTF8String:(char*) sqlite3_column_text(compiledStatement, 0)]];
}
else {
NSAssert1(0,@"Error preparing statement", sqlite3_errmsg(db));
}
sqlite3_finalize(compiledStatement);
}
/*
- (id)initWithStyle:(UITableViewStyle)style {
// Override initWithStyle: if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.
if ((self = [super initWithStyle:style])) {
}
return self;
}
*/
#pragma mark -
#pragma mark View lifecycle
- (void)viewDidLoad {
self.title = NSLocalizedString(@"Delete Categories",@"Delete your Categories");
categoryArray = [[NSMutableArray alloc]init];
[self initializeCategoryArray];
[super viewDidLoad];
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
self.navigationItem.rightBarButtonItem = self.editButtonItem;
}
/*
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
}
*/
/*
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
}
*/
/*
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
}
*/
/*
- (void)viewDidDisappear:(BOOL)animated {
[super viewDidDisappear:animated];
}
*/
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
#pragma mark -
#pragma mark Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
// Return the number of rows in the section.
return [self.categoryArray count];
}
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}
// Configure the cell...
NSUInteger row = [indexPath row];
cell.text = [categoryArray objectAtIndex:row];
return cell;
}
/*
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
// Return NO if you do not want the specified item to be editable.
return YES;
}
*/
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete the row from the data source
[categoryArray removeObjectAtIndex:indexPath.row];
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:YES];
[deleteCategoryTable reloadData];
NSString *selectedCategory = [categoryArray objectAtIndex:indexPath.row];
sqlite3 *db= [KeyCryptAppAppDelegate getNewDBConnection];
KeyCryptAppAppDelegate *appDelegate = (KeyCryptAppAppDelegate *)[[UIApplication sharedApplication] delegate];
const char *sql = [[NSString stringWithFormat:@"Delete from Categories where Category = '%@';", selectedCategory]cString];
sqlite3_stmt *compiledStatement;
if (sqlite3_prepare_v2(db, sql, -1, &compiledStatement, NULL)==SQLITE_OK)
{
sqlite3_exec(db,sql,NULL,NULL,NULL);
}
else {
NSAssert1(0,@"Error preparing statement", sqlite3_errmsg(db));
}
sqlite3_finalize(compiledStatement);
}
else if (editingStyle == UITableViewCellEditingStyleInsert) {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath {
}
*/
/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath {
// Return NO if you do not want the item to be re-orderable.
return YES;
}
*/
#pragma mark -
#pragma mark Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// Navigation logic may go here. Create and push another view controller.
/*
<#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:@"<#Nib name#>" bundle:nil];
// ...
// Pass the selected object to the new view controller.
[self.navigationController pushViewController:detailViewController animated:YES];
[detailViewController release];
*/
}
#pragma mark -
#pragma mark Memory management
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Relinquish ownership any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
// Relinquish ownership of anything that can be recreated in viewDidLoad or on demand.
// For example: self.myOutlet = nil;
}
- (void)dealloc {
[super dealloc];
}
@end
发布于 2010-12-21 17:52:02
1)删除的问题是
[categoryArray removeObjectAtIndex:indexPath.row];
也从db中删除它。
删除行后,使用[tableView reloadData]
重新装载tableView
2)如果它是唯一的一项,则没有问题
编辑:
这就是问题所在
[categoryArray removeObjectAtIndex:indexPath.row];
NSString *selectedCategory = [categoryArray objectAtIndex:indexPath.row];
在访问同一个indexPath.row处的值之后,您已经从数组中删除了indexPath.row处的值,显然它只会删除下一个值。:)
所以把这句话
NSString *selectedCategory = [categoryArray objectAtIndex:indexPath.row]
[categoryArray removeObjectAtIndex:indexPath.row];
之前的行
发布于 2015-06-24 15:52:34
这是你需要做的所有。归根结底,它可以很好地实现一种方法。
Swift 2
func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if editingStyle == .Delete {
//1. remove data from model
data.removeAtIndex(indexPath.row)
//2. remove row from view
tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
//3. custom method to update your view after removing
updateView()
}
}
Swift 3
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
//1. remove data from model
data.remove(at: indexPath.row)
//2. remove row from view
tableView.deleteRows(at: [indexPath as IndexPath], with: .fade)
//3. custom method to update your view after removing
updateView()
}
}
发布于 2010-12-21 17:56:17
您的代码很好,只是withRowAnimation:
不需要BOOL,而需要UITableViewRowAnimation
成员。例如:UITableViewRowAnimationRight
,让它滑出到桌子的右侧。
另外:你只是从数组中获取对象,你必须删除它!如果它是一个可变数组,你可以使用[categoryArray removeObjectAtIndex:indexpath.row]
https://stackoverflow.com/questions/4497925
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