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POUIButton and action for "next' and previous image
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  1. POUIButton and action for "next' and previous image
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    copied!<p>So, pretty new to iPhone dev and learning all the time. I know what I want but dont quite know where to start. I have really only dealt with tableView apps before this project so my practical knowledge of imageView's and custom actions is very much lacking!</p> <p>I want to have a UIImageView loaded with an image (using an array populated by a fetchedResultsController as images will be stored in a CoreData DB ). </p> <p>I want an UIButton with action "next" and UIButton with action "previous" which will control the previously mentioned imageViews' displayed image.</p> <p>Thus far I have the DB mapped and interface design but am failing to find this answer to these points (I am sure it will be fairly straight forward to those who know).</p> <p>Any advise or example code would be greatly appreciated. </p> <p>DetartrateD</p> <p>@shawnwall code snippet from below...</p> <pre><code>-(IBAction)nextImage { index++; int imageCount=31; if (index&lt;=imageCount) { NSString* imageName=[NSString stringWithFormat:@"img%i.jpg", index]; [picture setImage: [UIImage imageNamed: imageName]]; } } </code></pre> <p>Mutatable array seeded in viewDidLoad:</p> <pre><code>NSFetchRequest *request = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"Images" inManagedObjectContext:managedObjectContext]; [request setEntity:entity]; NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"topImage" ascending:YES]; NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil]; [request setSortDescriptors:sortDescriptors]; [sortDescriptor release]; [sortDescriptors release]; NSError *error = nil; NSMutableArray *mutableFetchResultsT = [[managedObjectContext executeFetchRequest:request error:&amp;error]mutableCopy]; if (mutableFetchResultsT == nil) { } [self setTopImageArray:mutableFetchResultsT]; NSLog(@"%i" , [topImageArray count]); </code></pre> <p>Image being added to array here:</p> <pre><code>Images *imageS = (Images *)[NSEntityDescription insertNewObjectForEntityForName:@"Images" inManagedObjectContext:managedObjectContext]; imageS.topImage = selectedImage; [topImageArray insertObject:imageS.topImage atIndex:0]; NSLog(@"%i" , [topImageArray count]); </code></pre> <p>... ...</p> <p>Same method but after I have created a thumbnail i call:</p> <pre><code>[self updateTopIV]; </code></pre> <p>Which is :</p> <pre><code>-(void)updateTopIV { topIV.image = [topImageArray objectAtIndex:0]; } </code></pre> <p>I then have the 2 action buttons (next/previous):</p> <pre><code>- (IBAction)nextTouch { [self showPhoto:1]; } - (IBAction)previousTouch { [self showPhoto:-1]; } - (void)showPhoto:(NSInteger)numberToAdd { topIV.image = [topImageArray objectAtIndex:currentPhotoIndex + numberToAdd]; } </code></pre>
 

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