Reload UIScrollView by tapping a UIButton - ios

Question

Let me explain my project first. I have some data in my SQLIte DB table called "note".
In "note" table I have these fields: id, noteToken, note.
What I am doing here is load all the note in an NSMUtableArray from that table. And create UIButton according to that array content number and add those buttons in a UIScrollView as subView. The number of buttons and width of scrollview generate auto according to the number of content of that array. Now, when some one tap one of those Buttons, it will bring him to a next viewController and show him the corresponding note details in that viewController.
I do the same thing with another NSMUtableArray, but these time it read all the id from the "note" table. It equally generate new delete button in the same UIScrollView. But if some one tap on these delete button it will delete that particular note from the table "note" of SQLIte DB. AND RELOAD THE UIScrollView. All are done except the RELOAD THE UIScrollView part. This is what I want. I tried with all exist solution but don't know why it's not working.
Here is my code:
- (void)viewDidLoad
{
[super viewDidLoad];
self.noteToken = [NSString stringWithFormat:#"%#%#", fairId, exibitorId];
scrollViewNoteWidth = 100;
[scrollViewNote setScrollEnabled:YES];
[scrollViewNote setContentSize:CGSizeMake((noteButtonWidth * countNoteButtonArray) + scrollViewNoteWidth, 100)];
sqLite = [[SQLite alloc] init];
[self.sqLite callDataBaseAndNoteTableMethods];
self.noteButtonArrayy = [[NSMutableArray alloc] init];
noteButtonArrayy = [self.sqLite returnDataFromNoteTable:noteToken];
[self LoadNoteButtonAndDeleteButton:noteButtonArrayy];
}
//////////////*----------------------- Note Section (Down) -----------------------*//////////////
-(void) LoadNoteButtonAndDeleteButton:(NSMutableArray *) noteButtonArray
{
sQLiteClass = [[SQLiteClass alloc] init];
noteButtonArrayToShowNoteButton = [[NSMutableArray alloc] init];
/*--------------- Load the noteButton & pass note (Down)---------------*/
for (int i = 0; i < [noteButtonArray count]; i++)
{
sQLiteClass = [noteButtonArray objectAtIndex:i];
// NSString *ids = [NSString stringWithFormat:#"%d", sQLiteClass.idNum];
NSString *nt = sQLiteClass.note;
[noteButtonArrayToShowNoteButton addObject:nt];
}
[self ShowNoteButtonMethod:noteButtonArrayToShowNoteButton];
/*--------------- Load the noteButton & pass note (Up)---------------*/
/*--------------- Load the deleteButton & pass id (Down)---------------*/
noteButtonArrayToDeleteNoteButton = [[NSMutableArray alloc] init];
for (int i = 0; i < [noteButtonArray count]; i++)
{
sQLiteClass = [noteButtonArray objectAtIndex:i];
// Convert int into NSString
NSString *ids = [NSString stringWithFormat:#"%d", sQLiteClass.idNum];
[noteButtonArrayToDeleteNoteButton addObject:ids];
}
[self ShowNoteDeleteButtonMethod:noteButtonArrayToDeleteNoteButton];
/*--------------- Load the deleteButton & pass id (Down)---------------*/
}
-(void) ShowNoteButtonMethod:(NSMutableArray *) btnarray
{
countNoteButtonArray = [btnarray count];
// For note button
noteButtonWidth = 60;
noteButtonXposition = 8;
for (NSString *urls in btnarray)
{
noteButtonXposition = [self addNoteButton:noteButtonXposition AndURL:urls];
}
}
-(int) addNoteButton:(int) xposition AndURL:(NSString *) urls
{
noteButton =[ButtonClass buttonWithType:UIButtonTypeCustom];
noteButton.frame = CGRectMake(noteButtonXposition, 8.0, noteButtonWidth, 60.0);
[noteButton setImage:[UIImage imageNamed:#"note.png"] forState:UIControlStateNormal];
[noteButton addTarget:self action:#selector(tapOnNoteButton:) forControlEvents:UIControlEventTouchUpInside];
[noteButton setUrl:urls];
noteButton.backgroundColor = [UIColor clearColor];
[self.scrollViewNote addSubview:noteButton];
noteButtonXposition = noteButtonXposition + noteButtonWidth + 18;
return noteButtonXposition;
}
-(void)tapOnNoteButton:(ButtonClass*)sender
{
urlNote = sender.url;
[self performSegueWithIdentifier:#"goToNoteDetailsViewController" sender:urlNote];
}
-(void) ShowNoteDeleteButtonMethod:(NSMutableArray *) btnarray
{
countNoteButtonArray = [btnarray count];
// For delete button
deleteNoteButtonWidth = 14;
deleteNoteButtonXposition = 31;
for (NSString *idNumber in btnarray)
{
deleteNoteButtonXposition = [self addDeleteButton:deleteNoteButtonXposition AndURL:idNumber];
}
}
-(int) addDeleteButton:(int) xposition AndURL:(NSString *) idNumber
{
deleteNoteButton =[ButtonClass buttonWithType:UIButtonTypeCustom];
deleteNoteButton.frame = CGRectMake(deleteNoteButtonXposition, 74.0, deleteNoteButtonWidth, 20.0);
[deleteNoteButton setImage:[UIImage imageNamed:#"delete.png"] forState:UIControlStateNormal];
[deleteNoteButton addTarget:self action:#selector(tapOnDeleteButton:) forControlEvents:UIControlEventTouchUpInside];
[deleteNoteButton setIdNum:idNumber];
deleteNoteButton.backgroundColor = [UIColor clearColor];
[self.scrollViewNote addSubview:deleteNoteButton];
deleteNoteButtonXposition = deleteNoteButtonXposition + deleteNoteButtonWidth + 65;
return deleteNoteButtonXposition;
}
-(void)tapOnDeleteButton:(ButtonClass*)sender
{
idNumb = sender.idNum;
[self.sqLite deleteData:[NSString stringWithFormat:#"DELETE FROM note WHERE id IS '%#'", idNumb]];
// NSLog(#"idNumb %#", idNumb);
//[self.view setNeedsDisplay];
//[self.view setNeedsLayout];
//[self LoadNoteButtonAndDeleteButton];
//[self viewDidLoad];
// if ([self isViewLoaded])
// {
// //self.view = Nil;
// //[self viewDidLoad];
// [self LoadNoteButtonAndDeleteButton];
// }
}
//////////////*----------------------- Note Section (Up) -----------------------*//////////////
-(void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:#"goToNoteDetailsViewController"])
{
NoteDetailsViewController *noteDetailsViewController = [segue destinationViewController];
[noteDetailsViewController setUrl:sender];
}
}
Here's the screen shot:

Answer 1

Here we can feel the difference between UIScrollView and UICollectionView, however UICollectionView is made up of UIScrollView, UICollectionView can be reload and adjust its content accordingly, where UIScrollView can't.
Ok, now in your case, you've to reload (refresh) your scroll view, which is not possible as we can with UICollectionView or UITableView.
You've two options,
Best option (little tough) : replace UIScrollView with UICollectionView - will take some of your time, but better for reducing code complexity and good performance of your app.
Poor option (easy) : Stay as it with UIScrollView - when you want to reload, delete each subview from it, and then again show and load everything. Highly not recommended.
IMHO, you should go with best option.