CollectionView（一）

1.cell（继承于UICollectionViewCell）

cell.h文件

@interface Cell : UICollectionViewCell

@property (strong,nonatomic)IBOutlet UIImageView *image;

@property (strong,nonatomic)IBOutlet UILabel *label;

cell.m文件

#import"Cell.h"

#import"CustomCellBackground.h"

@implementation Cell

- (id)initWithCoder:(NSCoder *)aDecoder{    

   self = [super initWithCoder:aDecoder]; 

if (self) { 

  CustomCellBackground *backgroundView = [[CustomCellBackground alloc]        initWithFrame:CGRectZero];        

  self.selectedBackgroundView = backgroundView;   

   }    

returnself;

}

2.CustomCellBackground（选中的背景）

.h文件

@interface CustomCellBackground :UIView

.m文件

#import "CustomCellBackground.h"

@implementation CustomCellBackground

- (void)drawRect:(CGRect)rect

{

    // draw a rounded rect bezier path filled with blue

    CGContextRef aRef =UIGraphicsGetCurrentContext();

    CGContextSaveGState(aRef);

    UIBezierPath *bezierPath = [UIBezierPathbezierPathWithRoundedRect:rectcornerRadius:5.0f];

    [bezierPathsetLineWidth:5.0f];

    [[UIColor blackColor] setStroke];

    

   UIColor *fillColor = [UIColorcolorWithRed:0.529green:0.808 blue:0.922alpha:1];

    [fillColorsetFill];

    

    [bezierPathstroke];

    [bezierPathfill];

    CGContextRestoreGState(aRef);

}

@end

3.CollectionViewController（继承于UICollectionViewController）

.h文件

@interface CollectionViewController : UICollectionViewController

.m文件

#import "CollectionViewController.h"

#import "DetailViewController.h"

#import "Cell.h"

NSString *kDetailedViewControllerID =@"DetailView";    

NSString *kCellID =@"cellID";                          

@implementationCollectionViewController

- (NSInteger)collectionView:(UICollectionView *)view numberOfItemsInSection:(NSInteger)section;

{

   return 32;

}

- (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath;

{

   

    Cell *cell = [cvdequeueReusableCellWithReuseIdentifier:kCellIDforIndexPath:indexPath];

    

    cell.label.text = [NSStringstringWithFormat:@"{%ld,%ld}", (long)indexPath.row, (long)indexPath.section];

    

   NSString *imageToLoad = [NSStringstringWithFormat:@"%ld.JPG", (long)indexPath.row];

    cell.image.image = [UIImageimageNamed:imageToLoad];

    

   return cell;

}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender

{

    if ([[segueidentifier]isEqualToString:@"showDetail"])

    {

        NSIndexPath *selectedIndexPath = [[self.collectionViewindexPathsForSelectedItems]objectAtIndex:0];

        

        // 点击详情图片加载大图

       NSString *imageNameToLoad = [NSStringstringWithFormat:@"%ld_full", (long)selectedIndexPath.row];

       NSString *pathToImage = [[NSBundlemainBundle]pathForResource:imageNameToLoadofType:@"JPG"];

        UIImage *image = [[UIImagealloc]initWithContentsOfFile:pathToImage];

        

        DetailViewController *detailViewController = [seguedestinationViewController];

        detailViewController.image = image;

    }

}

@end

4.DetailViewController

.h文件

@interface DetailViewController :UIViewController

@property (nonatomic,strong)UIImage *image;

.m文件

@interface DetailViewController ()

@property (nonatomic,weak)IBOutletUIImageView *imageView;

@end

@implementation DetailViewController

- (void)viewWillAppear:(BOOL)animated

{

    [superviewWillAppear:animated];

    self.imageView.image =self.image;

}

@end