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