I have an app that behaves somewhat like a photo gallery. They choose an image from there camera roll, and the image gets displayed in a UIImageView. I have a total of 9 image views. Now, I'm trying to add in the ability to press an edit button, and allow the user to delete photos. I accomplished this by placing a hidden UIButton over each image, and when the button is tapped, a UIAlertView appears asking if they would like to delete that image. After they click "Yes" in the UIAlertView, I would like that particular UIImageView to stop displaying the picture, and move each displayed picture 1 row to the left, so that there isn't a blank space in the gallery.
This is where things get tricky for me, I'm still very new to Objective-C and have no idea how to do this. I know that I should probably call moveRowAtIndexPath
and toIndexPath
, but I'm not sure if I should do this in viewDidLoad, viewWillAppear, or should I just create my own method for this? Here is a sample of what I'm working with, which may or may not be relevant:
- (void)applicationDidEnterBackground:(UIApplication*)application {
NSLog(@"Image on didenterbackground: %@", imageView);
NSMutableArray* array = [NSMutableArray arrayWithObject:[NSData dataWithData:UIImagePNGRepresentation(imageView.image)]];
[array addObject:[NSData dataWithData:UIImagePNGRepresentation(imageView2.image)]];
[array addObject:[NSData dataWithData:UIImagePNGRepresentation(imageView3.image)]];
[array addObject:[NSData dataWithData:UIImagePNGRepresentation(imageView4.image)]];
[self.user setObject:array forKey:@"images"];
[user synchronize];
}
- (void)viewDidLoad
{
self.user = [NSUserDefaults standardUserDefaults];
NSLog(@"It is %@", self.user);
NSMutableArray* array = [[self.user objectForKey:@"images"]mutableCopy];
imageView.image = [[UIImage alloc] initWithData:[array objectAtIndex:0]];
imageView2.image = [[UIImage alloc] initWithData:[array objectAtIndex:1]];
imageView3.image = [[UIImage alloc] initWithData:[array objectAtIndex:2]];
imageView4.image = [[UIImage alloc] initWithData:[array objectAtIndex:3]];
UIApplication *app = [UIApplication sharedApplication];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(applicationDidEnterBackground:)
name:UIApplicationDidEnterBackgroundNotification
object:app];
backToGalleryButton.hidden = YES;
tapToDeleteLabel.hidden = YES;
deleteButton1.hidden = YES;
[super viewDidLoad];
}
Any help or advice on this is much appreciated, thank you!
Why dont you just remove the object from the array if it is a delete function? removeObject or removeObjectAtIndex will do the job just fine. If you are using a tableview then call reloadData on it next.
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