01-08 UICollectionView 例子

1. #import "TimeCollectionCell.h"  

2. #import <UIKit/UIKit.h>   

   typedef void (^ReturnBlock)(NSString *showText);

   @interface TimeCollectionCell : UICollectionViewCell

   @property (nonatomic,strong)UILabel *timeLab;

   @property(nonatomic,strong) UIButton *btn;

   @property (nonatomic, copy) ReturnBlock returnTextBlock;

   - (void)returnText:(ReturnBlock)block;

   @end

3. #import "TimeCollectionCell.m"

4. #import "TimeCollectionCell.h"

    

   @implementation TimeCollectionCell

   - (instancetype)initWithFrame:(CGRect)frame{

       self = [super initWithFrame:frame];

       if (self) {

           

   //        self.timeLab = [[UILabel alloc] initWithFrame:self.contentView.bounds];

   //        self.timeLab = [[UILabel alloc] initWithFrame:CGRectMake(5, 5,40 , 40)];

   //        

   ////        _timeLab.backgroundColor = [UIColor lightGrayColor];

   //        _timeLab.backgroundColor=[UIColor redColor];

   //        _timeLab.font =[UIFont systemFontOfSize:15];

   //        _timeLab.textAlignment = NSTextAlignmentCenter;

   //        [self.contentView addSubview:self.timeLab];

           

           _btn=[[UIButton alloc]initWithFrame:CGRectMake(5, 5, 40 , 40)];

           _btn.backgroundColor=[UIColor redColor];

           [_btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];

           [self.contentView addSubview:_btn];

           

       }

       return self;

   }

    

    

   -(void)btnClick:(UIButton *)btn{

    

       NSLog(@"hh");

       if (self.returnTextBlock != nil) {

           self.returnTextBlock(@"你好！");

       }

    

   }

    

   -(void)returnText:(ReturnBlock)block{

       

       self.returnTextBlock = block;

       

   }

    

    

   #pragma mark  lizi

   /*

    

    #import "YYimageCell.h"

    

    @interface YYimageCell ()

    @property(nonatomic,strong)UIImageView *imageView;

    @end

    @implementation YYimageCell

    

    - (id)initWithFrame:(CGRect)frame

    {

    self = [super initWithFrame:frame];

    if (self) {

    

    UIImageView *imageView=[[UIImageView alloc]init];

    [self addSubview:imageView];

    self.imageView=imageView;

    }

    return self;

    }

    

    -(void)setIcon:(NSString *)icon

    {

    _icon=[icon copy];

    self.imageView.image=[UIImage imageNamed:icon];

    }

    

    

    -(void)layoutSubviews

    {

    [super layoutSubviews];

    self.imageView.frame=self.bounds;

    }

    */

    

   @end

5. #import "AppDelegate.h"

   #import "GzCollectionViewController.h"

   @interface AppDelegate ()

    

   @end

    

   @implementation AppDelegate

    

    

   - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

       _window=[[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];

       GzCollectionViewController  *cc=[GzCollectionViewController new];

       UINavigationController *nav=[[UINavigationController alloc]initWithRootViewController:cc];

       _window.rootViewController=nav;

       

       [_window makeKeyAndVisible];

       return YES;

   }

6.  

   主函数

7. #import "GzCollectionViewController.h"

   #import "TimeCollectionCell.h"

   @interface GzCollectionViewController ()<UICollectionViewDataSource,UICollectionViewDelegate,UICollectionViewDelegateFlowLayout>{

       UICollectionView *_collectionView;

   }

    

   @end

    

   #define SCREENW [UIScreen mainScreen].bounds.size.width

   #define SCREENH [UIScreen mainScreen].bounds.size.height

    

   @implementation GzCollectionViewController

    

   - (void)viewDidLoad {

       [super viewDidLoad];

       self.view.backgroundColor=[UIColor yellowColor];

       

       self.title=@"瀑布流";

       

   #pragma mark  http://www.cnblogs.com/wendingding/p/3888797.html  文顶顶    http://www.cnblogs.com/wendingding/p/3888642.html   http://www.cnblogs.com/wendingding/p/3890953.html

       UICollectionViewFlowLayout *flowLayOut = [[UICollectionViewFlowLayout alloc]init];

   //    [flowLayOut setItemSize:CGSizeMake((SCREENW - 20)/6, 30)];

   //    [flowLayOut setItemSize:CGSizeMake(200, 100)];

       flowLayOut.sectionInset = UIEdgeInsetsMake(5, 5, 5, 5);

       

       

       _collectionView = [[UICollectionView alloc]initWithFrame:CGRectMake(0, 0, SCREENW, SCREENH) collectionViewLayout:flowLayOut];

       _collectionView.dataSource = self;

       _collectionView.delegate = self;

       _collectionView.backgroundColor = [UIColor yellowColor];

       [self.view addSubview:_collectionView];

       

       

       [_collectionView registerClass:[TimeCollectionCell class] forCellWithReuseIdentifier:@"cell"];

    

   // 6     [self.collectinView registerNib:[UINib nibWithNibName:@"YYcell" bundle:nil] forCellWithReuseIdentifier:YYIDCell];

   }

    

   -(void)preference{

   /*'''

    

    

    50     //默认处于第0组的第500个模型的左边

    51 //    [self.collectinView scrollToItemAtIndexPath:[NSIndexPath indexPathForItem:500 inSection:0] atScrollPosition:UICollectionViewScrollPositionLeft animated:YES];

    52

    53      [self.collectinView scrollToItemAtIndexPath:[NSIndexPath indexPathForItem:0 inSection:50] atScrollPosition:UICollectionViewScrollPositionLeft animated:YES];

    

    

    

    

    

    　//3）通过动画滚动到下一个位置

    37      [self.collectinView scrollToItemAtIndexPath:nextIndexPath atScrollPosition:UICollectionViewScrollPositionLeft animated:YES];

    

    

    */

    

   }

    

   -(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{

       return 2 ;

   }

   - (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{

       return 5;

   }

    

   - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{

       static NSString *identifier = @"cell";

       

       //也可以 向tableviewcell 那样的在这里面写，但是可能会出错  （可能会出错的点  好像是三点 ？？？）

       

       TimeCollectionCell *cell =(TimeCollectionCell*) [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];

       cell.layer.borderColor = [UIColor lightGrayColor].CGColor;

       cell.layer.borderWidth = 2;

   //    

   //    cell.timeLab.backgroundColor =[UIColor whiteColor];

       cell.backgroundColor =[UIColor greenColor];

   //    cell.timeLab.textColor=[UIColor redColor];

   //    cell.timeLab.text = @"200";

       

       

       

       [cell.btn  setTitle:@"200" forState:UIControlStateNormal];

        __block  NSString  *reStr;

       [cell returnText:^(NSString *showText) {

             reStr=showText;

    

       }];

      

   //    NSLog(@"....heihei......");

       

       return cell ;

   }

   -(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{

    

       NSLog(@"嘿嘿  选中了 ！！！");

       

   }

    

   //定义每个UICollectionView 的大小

   - (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath

   {

   //    return CGSizeMake((SCREENW - 10)/5, 26);

       return CGSizeMake(60,60);

   }

    

   //- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section{

   //    return 0;

   //}

   //- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section{

   //    return 0;

   //}

   @end