ios6 UICollectionView を試してみた

この記事はアピリッツの技術ブログ「DoRuby」から移行した記事です。情報が古い可能性がありますのでご注意ください。

ios6から追加されたUICollectionViewのサンプルを作成してみました。

実装画面

下記が実装したアプリ画面です。

UICollectionViewDemoController.h

#import <uikit /uikit.h>

@interface UICollectionViewDemoController : UIViewController 
<uicollectionviewdatasource , uicollectionviewdelegate> {
    UICollectionView *_collectionView;
}

@property (nonatomic, retain) UICollectionView *collectionView;


@end

UICollectionViewDemoController.m

#import "UICollectionViewDemoController.h"

@interface UICollectionViewDemoController (Private)
- (void)setUp;
- (CGFloat)getRandInt:(int)min max:(int)max;
@end


@implementation UICollectionViewDemoController


- (void)viewDidLoad
{
    [super viewDidLoad];
    [self setUp];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

- (void)setUp
{
    UICollectionViewFlowLayout *flowLayout = [[[UICollectionViewFlowLayout alloc] init] autorelease];
    [flowLayout setItemSize:CGSizeMake(79, 80)];
    [flowLayout setMinimumLineSpacing:1.0f];
    [flowLayout setMinimumInteritemSpacing:1.0f];
    //[flowLayout setScrollDirection:UICollectionViewScrollDirectionHorizontal];
    
    UICollectionView *collectionView = 
[[[UICollectionView alloc] initWithFrame:self.view.frame collectionViewLayout:flowLayout] autorelease];
    self.collectionView = collectionView;
    self.collectionView.delegate   = self;
    self.collectionView.dataSource = self;
    
    [self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"UICollectionViewCell"];
    [self.view addSubview:self.collectionView];
}

-(CGFloat)getRandInt:(int)min max:(int)max {
	static int randInitFlag;
	if (randInitFlag == 0) {
		srand(time(NULL));
		randInitFlag = 1;
	}
	return min + (rand()*(max-min+1.0)/(1.0+RAND_MAX));
}

#pragma UICollectionViewDelegate

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    return 1000;
}

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
    return 1;
}

#pragma UICollectionViewDataSource

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    UICollectionViewCell *cell =
 [collectionView dequeueReusableCellWithReuseIdentifier:@"UICollectionViewCell" forIndexPath:indexPath];

    CGFloat red   = [self getRandInt:1 max:1000] / 1000;
    CGFloat green = [self getRandInt:1 max:1000] / 1000;
    CGFloat blue  = [self getRandInt:1 max:1000] / 1000;
    
    UIColor *color = [UIColor colorWithRed:red green:green blue:blue alpha:1.0];
    [cell setBackgroundColor:color];
    
    return cell;
}


@end

以上です。