我是新手，UICollectionView我决定以UICollectionView编程方式创建一个测试。所以我SingleViewApplication在 Xcode 中创建了一个新项目并编写了以下代码：
@interface GzViewController ()
@property (nonatomic, strong) UICollectionView *collectionView;
@property (nonatomic, strong) NSArray *items;
@end
@implementation GzViewController
- (void)viewDidLoad{
[super viewDidLoad];
self.items = @[@"Address Book", @"Contact", @"Email", @"Phone", @"SMS", @"Free Text", @"URL", @"WiFi"];
UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
self.collectionView = [[UICollectionView alloc] initWithFrame:[self.view frame] collectionViewLayout:flowLayout];
[self.collectionView setDataSource:self];
[self.collectionView setDelegate:self];
[self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"Cell"];
[self.view addSubview:self.collectionView];
}
#pragma mark - UICollectionView Datasource
- (NSInteger)collectionView:(UICollectionView *)view numberOfItemsInSection:(NSInteger)section {
return 1;
}
- (NSInteger)numberOfSectionsInCollectionView: (UICollectionView *)collectionView {
return [self.items count];
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath {
UICollectionViewCell *cell = [cv dequeueReusableCellWithReuseIdentifier:@"Cell" forIndexPath:indexPath];
cell.backgroundColor = [UIColor whiteColor];
return cell;
}
#pragma mark – UICollectionViewDelegateFlowLayout
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
CGSize retval = CGSizeMake(80, 80);
return retval;
}
- (UIEdgeInsets)collectionView:
(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section {
return UIEdgeInsetsMake(5, 20, 5, 5);
}
结果是这样的：
我必须做什么才能UICollectionView在屏幕上显示两列？
OSX 10.8.3 Xcode 4.6.2 iOS 6.1