Thursday, June 25, 2009
[iPhone] Getting images from your bundle without hardcoding
Thursday, June 25, 2009 
Update 3. Better yet:
Update. I'm a moron. I should have just looked into NSBundle.h.
You can get the number of a type of item in your bundle on the iPhone, and this can come in very handy. No magic numbers. This code example doesn't look in a resource directory, but you could supply the inDirectory with something like @"backgrounds" and thus build up arrays of images of differing types, etc. There may be a better way of doing this (ie. if you only want to get the count of the items), but I don't know about it yet.
totalCount = 0;Update 2. Since the file structure normally gets flattened out within your iPhone application (I guess there are some compiler tricks you can do), you'll always be targeting the root of the app directory. With that in mind, you'll want to probably use some kind of naming convention to separate any special files you'd like to collect from the bundle. You can also use extension. Say collect up and get the count of all images in your bundle that are JPGs and contain "image_" in the title:
NSArray *d = [[NSBundle mainBundle] pathsForResourcesOfType:@"jpg" inDirectory:nil];
for(NSString *s in d){
if([[s lastPathComponent] hasPrefix:@"image_"]){
totalCount++;
}
}
totalCount = 0;Boom.
NSArray *d = [[NSBundle mainBundle] pathsForResourcesOfType:@"jpg" inDirectory:nil];
for( int i=0;i<[d count];i++){
NSString *searchForMe = @"image_";
NSString *s = [[NSString alloc] initWithString:[d objectAtIndex:i]];
NSRange range = [s rangeOfString:searchForMe];
if( range.location != NSNotFound ){
totalCount++;
}
}
Update. I'm a moron. I should have just looked into NSBundle.h.
NSUInteger jpegCount = [[[NSBundle mainBundle] pathsForResourcesOfType:@"jpg" inDirectory:subDirName] count];
You can get the number of a type of item in your bundle on the iPhone, and this can come in very handy. No magic numbers. This code example doesn't look in a resource directory, but you could supply the inDirectory with something like @"backgrounds" and thus build up arrays of images of differing types, etc. There may be a better way of doing this (ie. if you only want to get the count of the items), but I don't know about it yet.
NSMutableArray * imageArray = [[NSMutableArray alloc] init];Tada. I hope to find some more examples.
NSEnumerator * imageBundlePathEnumerator = [[[NSBundle mainBundle] pathsForResourcesOfType: @"jpg" inDirectory: nil] objectEnumerator];
NSString * imageBundlePath = nil;
while (imageBundlePath = [imageBundlePathEnumerator nextObject])
{
[imageArray addObject: [[[NSImage alloc] initWithContentsOfFile: imageBundlePath] autorelease]];
}
NSLog(@"Number of images loaded : %d", [imageArray count]);
NSImage * anImage = nil;
NSEnumerator * imageEnumerator = [imageArray objectEnumerator];
while (anImage = [imageEnumerator nextObject])
{
NSLog(@"image = %@", anImage);
}
Labels: iPhone, Objective-C
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