我有一个导航控制器,上面有一个表格视图。我想要导航栏上的两个按钮,即“添加到收藏夹”,另一个是“编辑”。
两个按钮都应该触发使表格视图进入编辑模式的事件。从“添加到收藏夹”按钮中,我希望表格视图进入插入模式,即每个单元格前面的+绿色符号和编辑按钮,我希望它进入删除模式,即 - 每个单元格前面的负号。
我已经整理好编辑按钮,但我无法执行添加到收藏按钮。将我的代码贴在这里以供参考
viewDidLoad 方法:
- (void)viewDidLoad
{
self.navigationItem.rightBarButtonItem = self.editButtonItem;
self.navigationItem.leftBarButtonItem=[[[UIBarButtonItem alloc]initWithTitle:@"Add to Favourite" style:UIBarButtonItemStylePlain target:self action:@selector(saveAction:)]autorelease];
[super viewDidLoad];
- (void)setEditing:(BOOL)editing animated:(BOOL)animated {
[super setEditing:editing animated:animated];
[self.tableView setEditing:editing animated:YES];
//Do not let the user add if the app is in edit mode.
if(editing)
self.navigationItem.leftBarButtonItem.enabled = NO;
else
self.navigationItem.leftBarButtonItem.enabled = YES;
NSLog(@"i came till here"); }
在这种方法中,我只是从数据库中检索值并将其从数据库和表视图中删除。
- (void)tableView:(UITableView *)tv commitEditingStyle:(UITableViewCellEditingStyle)editingStyle
forRowAtIndexPath:(NSIndexPath *)indexPath {
if(editingStyle == UITableViewCellEditingStyleDelete) {
NSDictionary *rowVals = (NSDictionary *) [appdelegate.tablearr objectAtIndex:indexPath.row];
NSString *keyValue = (NSString *) [rowVals objectForKey:@"id"];
// [tableView beginUpdates];
sqlite3 *db;
int dbrc; //Codice di ritorno del database (database return code)
AppDelegate *appDelegate = (AppDelegate*) [UIApplication sharedApplication].delegate;
const char *dbFilePathUTF8 = [appDelegate.dbFilePath UTF8String];
dbrc = sqlite3_open(dbFilePathUTF8, &db);
if (dbrc) {
NSLog(@"Impossibile aprire il Database!");
return;
}
sqlite3_stmt *dbps; //Istruzione di preparazione del database
NSString *deleteStatementsNS = [NSString stringWithFormat: @"DELETE FROM \"Hell\" WHERE id='%@'", keyValue];
const char *deleteStatement = [deleteStatementsNS UTF8String];
dbrc = sqlite3_prepare_v2(db, deleteStatement, -1, &dbps, NULL);
dbrc = sqlite3_step(dbps);
sqlite3_finalize(dbps);
sqlite3_close(db);
[appdelegate.tablearr removeObjectAtIndex:indexPath.row];
//Delete the object from the table.
[self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
这是我按下“添加到收藏夹”按钮时触发的一种方法
-(void)saveAction:(UIBarButtonItem *)sender{
NSLog(@"here");
}
现在我应该在这个方法中写什么,以便表格视图进入编辑状态,并在每个单元格前面插入一个 + 绿色的东西?