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Cleaned up Kittens sample app and added comments for clarity.

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In particular, the NSValue-boxed CGSize array used as a data model for the kittens
is generated with random sizes, for unclear reasons.  It turns out this is a workaround
to convince PlaceKitten to send us unique images.
This commit is contained in:
Hannah Troisi
2015-06-21 11:36:19 -07:00
parent ed4ccfcc7f
commit 710c51593e
2 changed files with 22 additions and 7 deletions
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6
examples/Kittens/Sample/BlurbNode.m
View File

@@ -28,6 +28,9 @@ static NSString *kLinkAttributeName = @"PlaceKittenNodeLinkAttributeName";
@implementation BlurbNode
#pragma mark -
#pragma mark ASCellNode.
- (instancetype)init
{
if (!(self = [super init]))
@@ -85,6 +88,9 @@ static NSString *kLinkAttributeName = @"PlaceKittenNodeLinkAttributeName";
textNodeSize.height);
}
#pragma mark -
#pragma mark ASTextNodeDelegate methods.
- (BOOL)textNode:(ASTextNode *)richTextNode shouldHighlightLinkAttribute:(NSString *)attribute value:(id)value atPoint:(CGPoint)point
{
// opt into link highlighting -- tap and hold the link to try it! must enable highlighting on a layer, see -didLoad

23
examples/Kittens/Sample/ViewController.m
View File

@@ -18,15 +18,15 @@
#import "KittenNode.h"
static const NSInteger kLitterSize = 20;
static const NSInteger kLitterBatchSize = 10;
static const NSInteger kMaxLitterSize = 100;
static const NSInteger kLitterSize = 20; // intial number of kitten cells in ASTableView
static const NSInteger kLitterBatchSize = 10; // number of kitten cells to add to ASTableView
static const NSInteger kMaxLitterSize = 100; // max number of kitten cells allowed in ASTableView
@interface ViewController () <ASTableViewDataSource, ASTableViewDelegate>
{
ASTableView *_tableView;
// array of boxed CGSizes corresponding to placekitten kittens
// array of boxed CGSizes corresponding to placekitten.com kittens
NSArray *_kittenDataSource;
BOOL _dataSourceLocked;
@@ -54,7 +54,6 @@ static const NSInteger kMaxLitterSize = 100;
_tableView.asyncDelegate = self;
// populate our "data source" with some random kittens
_kittenDataSource = [self createLitterWithSize:kLitterSize];
return self;
@@ -64,10 +63,13 @@ static const NSInteger kMaxLitterSize = 100;
{
NSMutableArray *kittens = [NSMutableArray arrayWithCapacity:litterSize];
for (NSInteger i = 0; i < litterSize; i++) {
// placekitten.com will return the same kitten picture if the same pixel height & width are requested,
// so generate kittens with different width & height values.
u_int32_t deltaX = arc4random_uniform(10) - 5;
u_int32_t deltaY = arc4random_uniform(10) - 5;
CGSize size = CGSizeMake(350 + 2 * deltaX, 350 + 4 * deltaY);
[kittens addObject:[NSValue valueWithCGSize:size]];
}
return kittens;
@@ -98,7 +100,7 @@ static const NSInteger kMaxLitterSize = 100;
#pragma mark -
#pragma mark Kittens.
#pragma mark ASTableView.
- (ASCellNode *)tableView:(ASTableView *)tableView nodeForRowAtIndexPath:(NSIndexPath *)indexPath
{
@@ -143,17 +145,24 @@ static const NSInteger kMaxLitterSize = 100;
- (void)tableView:(UITableView *)tableView willBeginBatchFetchWithContext:(ASBatchContext *)context
{
NSLog(@"adding kitties");
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
sleep(1);
dispatch_async(dispatch_get_main_queue(), ^{
// populate a new array of random-sized kittens
NSArray *moarKittens = [self createLitterWithSize:kLitterBatchSize];
NSMutableArray *indexPaths = [[NSMutableArray alloc] init];
// find number of kittens in the data source and create their indexPaths
NSInteger existingRows = _kittenDataSource.count + 1;
for (NSInteger i = 0; i < moarKittens.count; i++) {
[indexPaths addObject:[NSIndexPath indexPathForRow:existingRows + i inSection:0]];
}
// add new kittens to the data source & notify table of new indexpaths
_kittenDataSource = [_kittenDataSource arrayByAddingObjectsFromArray:moarKittens];
[tableView insertRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationFade];