AssetTablePicker behaves like iOS Photos: loads scrolled to the bottom and loads quickly

Classes/ELCAssetTablePicker.h

@@ -24,6 +24,7 @@
 @property (nonatomic, assign) ALAssetsGroup *assetGroup;
 @property (nonatomic, retain) NSMutableArray *elcAssets;
 @property (nonatomic, retain) IBOutlet UILabel *selectedAssetsLabel;
+@property (nonatomic) BOOL reloadData;
 
 -(int)totalSelectedAssets;
 -(void)preparePhotos;

Classes/ELCAssetTablePicker.m

@@ -12,13 +12,15 @@
 
 
 @implementation ELCAssetTablePicker
-
+{
+    NSInteger start;
+}
 @synthesize parent;
 @synthesize selectedAssetsLabel;
-@synthesize assetGroup, elcAssets;
+@synthesize assetGroup, elcAssets, reloadData;
 
 -(void)viewDidLoad {
-        
+    self.reloadData = YES;
 	[self.tableView setSeparatorColor:[UIColor clearColor]];
 	[self.tableView setAllowsSelection:NO];
 
@@ -30,10 +32,35 @@ -(void)viewDidLoad {
 	[self.navigationItem setRightBarButtonItem:doneButtonItem];
 	[self.navigationItem setTitle:@"Loading..."];
 
+    NSInteger count = self.assetGroup.numberOfAssets;
+    NSInteger startNumberOfAssets = 96 + count%4;
+    start = MAX(0, count-startNumberOfAssets);
+
+    // Set up the first ~100 photos
+    NSIndexSet *indexSet = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(start, count > startNumberOfAssets ? startNumberOfAssets : count)];
+    for (int i = 0; i < start; i++){
+        [self.elcAssets addObject:[NSNull null]];
+    }
+    [self.assetGroup enumerateAssetsAtIndexes:indexSet options:0 usingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {
+        if(result == nil) 
+        {
+            return;
+        }
+        ELCAsset *elcAsset = [[[ELCAsset alloc] initWithAsset:result] autorelease];
+        [elcAsset setParent:self];
+        [self.elcAssets addObject:elcAsset];
+    }];
+    [self.tableView reloadData];
+
+    [self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:ceil(assetGroup.numberOfAssets / 4.0)-1 inSection:0] atScrollPosition:UITableViewScrollPositionBottom animated:NO];
+
+    // For some reason it only scrolls about 80% through the final image... This scrolls
+    // the table view all the way to the bottom. 50 is just a number thats bigger than the 
+    // sliver of the image thats covered up.
+    [self.tableView setContentOffset:CGPointMake(0, self.tableView.contentOffset.y+50)];
+
 	[self performSelectorInBackground:@selector(preparePhotos) withObject:nil];
 
-    // Show partial while full list loads
-	[self.tableView performSelector:@selector(reloadData) withObject:nil afterDelay:.5];
 }
 
 -(void)preparePhotos {
@@ -42,21 +69,19 @@ -(void)preparePhotos {
 
 
     NSLog(@"enumerating photos");
-    [self.assetGroup enumerateAssetsUsingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) 
-     {         
-         if(result == nil) 
-         {
-             return;
-         }
-         
-         ELCAsset *elcAsset = [[[ELCAsset alloc] initWithAsset:result] autorelease];
-         [elcAsset setParent:self];
-         [self.elcAssets addObject:elcAsset];
-     }];    
+
+    NSIndexSet *newIndexSet = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, start)];
+    [self.assetGroup enumerateAssetsAtIndexes:newIndexSet options:0 usingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {
+        if(result == nil) 
+        {
+            return;
+        }
+        ELCAsset *elcAsset = [[[ELCAsset alloc] initWithAsset:result] autorelease];
+        [elcAsset setParent:self];
+        [self.elcAssets replaceObjectAtIndex:index withObject:elcAsset];
+    }];
     NSLog(@"done enumerating photos");
-
-	[self.tableView reloadData];
-	[self.navigationItem setTitle:@"Pick Photos"];
+    [self.navigationItem performSelectorOnMainThread:@selector(setTitle:) withObject:@"Pick Photos" waitUntilDone:NO];
 
     [pool release];
 
@@ -65,15 +90,14 @@ -(void)preparePhotos {
 - (void) doneAction:(id)sender {
 
 	NSMutableArray *selectedAssetsImages = [[[NSMutableArray alloc] init] autorelease];
-	    
-	for(ELCAsset *elcAsset in self.elcAssets) 
+    NSArray *currentlyLoadedAssets = [self.elcAssets copy];
+	for(ELCAsset *elcAsset in currentlyLoadedAssets) 
     {		
-		if([elcAsset selected]) {
+		if(elcAsset != (id)[NSNull null] && [elcAsset selected]) {
 
 			[selectedAssetsImages addObject:[elcAsset asset]];
 		}
 	}
-
     [(ELCAlbumPickerController*)self.parent selectedAssets:selectedAssetsImages];
 }
 
@@ -86,7 +110,7 @@ - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
 
 
 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
-    return ceil([self.assetGroup numberOfAssets] / 4.0);
+    return ceil(assetGroup.numberOfAssets / 4.0);
 }
 
 - (NSArray*)assetsForIndexPath:(NSIndexPath*)_indexPath {
@@ -135,14 +159,17 @@ - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(N
 
     ELCAssetCell *cell = (ELCAssetCell*)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
 
+    NSMutableArray *assets = [[self assetsForIndexPath:indexPath] mutableCopy];
+    [assets removeObjectIdenticalTo:[NSNull null]];
     if (cell == nil) 
     {		        
-        cell = [[[ELCAssetCell alloc] initWithAssets:[self assetsForIndexPath:indexPath] reuseIdentifier:CellIdentifier] autorelease];
+        cell = [[[ELCAssetCell alloc] initWithAssets:assets reuseIdentifier:CellIdentifier] autorelease];
     }	
 	else 
     {		
-		[cell setAssets:[self assetsForIndexPath:indexPath]];
+		[cell setAssets:assets];
 	}
+
 
     return cell;
 }