Button deletes in array but not in View - iphone

Question

I'm having trouble removing image in my scrollView, i put my images in UIScrollView then add button, when clicked will prompt an alert view asking if you want to delete it. When yes, deletes in my NSDocumentDirectory but not in my View. My images is from NSDocumentDirectory picked from an ImagePicker.
- (void)addImage:(UIImage *)image {
[_images addObject:image];
[_thumbs addObject:[image imageByScalingAndCroppingForSize:CGSizeMake(60, 60)]];
[self createScrollView];
}
- (void) createScrollView {
[scrollView setNeedsDisplay];
int row = 0;
int column = 0;
for(int i = 0; i < _thumbs.count; ++i) {
UIImage *thumb = [_thumbs objectAtIndex:i];
UIButton * button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake(column*60+10, row*60+10, 60, 75);
[button setImage:thumb forState:UIControlStateNormal];
[button addTarget:self
action:#selector(buttonClicked:)
forControlEvents:UIControlEventTouchUpInside];
button.tag = i;
[scrollView addSubview:button];
if (column == 4) {
column = 0;
row++;
} else {
column++;
}
}
[scrollView setContentSize:CGSizeMake(300, (row+1) * 60 + 10)];
}
- (IBAction)buttonClicked:(id)sender {
_clickedButton = (UIButton *)sender;
UIAlertView *saveMessage = [[UIAlertView alloc] initWithTitle:#""
message:#"DELETE？"
delegate:self
cancelButtonTitle:#"NO"
otherButtonTitles:#"YES", nil];
[saveMessage show];
}
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
NSString *title = [alertView buttonTitleAtIndex:buttonIndex];
if([title isEqualToString:#"YES"]) {
UIButton *button = _clickedButton;
[button removeFromSuperview];
[_images objectAtIndex:button.tag];
[_images removeObjectAtIndex:button.tag];
NSFileManager *fileManager = [NSFileManager defaultManager];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:#"images%lu.png", button.tag]];
[fileManager removeItemAtPath: fullPath error:NULL];
NSLog(#"image removed");
}
- (void)viewDidLoad
{
self.slotBg = [[UIView alloc] initWithFrame:CGRectMake(43, 370, 310, 143)];
CAGradientLayer *gradient = [CAGradientLayer layer];
gradient.frame = self.slotBg.bounds;
gradient.colors = [NSArray arrayWithObjects:(id)[[UIColor grayColor] CGColor], (id)[[UIColor whiteColor] CGColor], nil];
[self.slotBg.layer insertSublayer:gradient atIndex:0];
[self.view addSubview:self.slotBg];
self.scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0.0f,0.0f,300.0f,130.0f)];
[slotBg addSubview:self.scrollView];
}
- (void)viewDidAppear:(BOOL)animated
{
[_thumbs removeAllObjects];
for(int i = 0; i <= 100; i++)
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [paths objectAtIndex:0];
NSString *savedImagePath = [documentsDir stringByAppendingPathComponent:[NSString stringWithFormat:#"oneSlotImages%d.png", i]];
NSLog(#"savedImagePath=%#",savedImagePath);
if([[NSFileManager defaultManager] fileExistsAtPath:savedImagePath]){
[self addImage:[UIImage imageWithContentsOfFile:savedImagePath]];
NSLog(#"file exists");
}
}
NSLog(#"Count : %d", [_images count]);
}

Answer 1

You are calling createScrollView each time you add an image to your array. What it seems to be doing is creating buttons containing the same image on top of each other. Your code seems to be removing it from the view, but it looks like there are similar buttons just below it. So call createScrollView only after you've added all the images and remove it from your addImage:.
for(int i = 0; i <= 100; i++)
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [paths objectAtIndex:0];
NSString *savedImagePath = [documentsDir stringByAppendingPathComponent:[NSString stringWithFormat:#"oneSlotImages%d.png", i]];
NSLog(#"savedImagePath=%#",savedImagePath);
if([[NSFileManager defaultManager] fileExistsAtPath:savedImagePath]){
[self addImage:[UIImage imageWithContentsOfFile:savedImagePath]];
NSLog(#"file exists");
}
}
[self createScrollView];

Answer 2

//after deleting the image from document directory just call viewDidAppear again...
[self viewDidAppear:yes];
Hope this will help you...

Answer 3

set tag value to button.then get the button in the following function by
(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
UIButton *btn = (UIButton*)[scrollview viewWithTag:button.tag];
//your button tag
[btn removeFromSuperView];
}

Answer 4

try this method :
- (void)removeObjectWithTag:(int)objectTag
{
[_thumbs removeObjectAtIndex:objectTag];
for (UIView *view in scrollView.subviews)
{
[view removeFromSuperview];
}
scrollView.contentSize = CGSizeZero;
[self createScrollView];
}