iOS UICollectionView 的简单显示
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController<UICollectionViewDataSource,UICollectionViewDelegate>
@property (nonatomic ,strong) UICollectionView *collection;
@property (nonatomic ,strong) NSMutableArray *arrImg;
@end
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.arrImg = [NSMutableArray array];
for (int i = 0; i < 47; i++) {
[self.arrImg addObject:[NSString stringWithFormat:@"%d.jpg",i]];
}
//
UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
self.collection = [[UICollectionView alloc] initWithFrame:self.view.bounds collectionViewLayout:layout];
//self.collection.backgroundColor = [UIColor redColor];
self.collection.dataSource =self;
self.collection.delegate = self;
[self.view addSubview:self.collection];
[self.collection registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"Collection"];
}
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
return self.arrImg.count;
}
//-( NSInteger )numberOfSectionsInCollectionView:( UICollectionView *)collectionView
//
//{
//
// return 1 ;
//
//}
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"Collection" forIndexPath:indexPath];
cell.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:self.arrImg[indexPath.row]]];
return cell;
}
-( void )collectionView:( UICollectionView *)collectionView didSelectItemAtIndexPath:( NSIndexPath *)indexPath
{
UICollectionViewCell * cell = ( UICollectionViewCell *)[collectionView cellForItemAtIndexPath :indexPath];
cell. backgroundColor = [ UIColor colorWithRed :(( arc4random ()% 255 )/ 255.0 ) green :(( arc4random ()% 255 )/ 255.0 ) blue :(( arc4random ()% 255 )/ 255.0 ) alpha : 1.0f ];
}
-( BOOL )collectionView:( UICollectionView *)collectionView shouldSelectItemAtIndexPath:( NSIndexPath *)indexPath
{
return YES ;
}
- ( CGSize )collectionView:( UICollectionView *)collectionView layout:( UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:( NSIndexPath *)indexPath
{
return CGSizeMake ( 90 , 90 );
}
-( UIEdgeInsets )collectionView:( UICollectionView *)collectionView layout:( UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:( NSInteger )section
{
return UIEdgeInsetsMake ( 10 , 10 , 10 , 10 );
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
运行结果如下:
@end