ViewController.m
//首先让我们先设置一个宏定义
#define screenHeight [[UIScreen mainScreen]bounds].size.height //屏幕高度
#define screenWidth [[UIScreen mainScreen]bounds].size.width //屏幕宽度
#define colletionCell 3 //设置具体几列
导入头文件#import "CollectionViewCell.h"
//接下来我们设置代理以及创建成员变量
<UICollectionViewDelegate,UICollectionViewDataSource>{
UICollectionView *collectionView1;
NSMutableArray *hArr; //记录每个cell的高度
}
//接下来我们在设置viewDidlod
- (void)viewDidLoad {
[super viewDidLoad];
hArr = [[NSMutableArray alloc] init];
UICollectionViewFlowLayout *flowLayout=[[UICollectionViewFlowLayout alloc]init];
[flowLayout setScrollDirection:UICollectionViewScrollDirectionVertical]; //设置横向还是竖向
collectionView1=[[UICollectionView alloc] initWithFrame:CGRectMake(0, 0, screenWidth ,screenHeight) collectionViewLayout:flowLayout];
collectionView1.dataSource=self;
collectionView1.delegate=self;
[collectionView1 setBackgroundColor:[UIColor clearColor]];
[collectionView1 registerClass:[CollectionViewCell class] forCellWithReuseIdentifier:@"UICollectionViewCell"];
[self.view addSubview:collectionView1];
}
//接下来实现网格的代理方法注意这里必须要实现的代理方法
#pragma mark -- UICollectionViewDataSource
//定义展示的UICollectionViewCell的个数
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
return 10;
}
//定义展示的Section的个数
-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
return 1;
}
//每个UICollectionView展示的内容
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
static NSString * CellIdentifier = @"UICollectionViewCell";
CollectionViewCell * cell = [collectionView dequeueReusableCellWithReuseIdentifier:CellIdentifier forIndexPath:indexPath];
cell.backgroundColor = [UIColor purpleColor];
NSArray *arr = @[[UIImage imageNamed:@"1.jpg"],[UIImage imageNamed:@"2.jpg"],[UIImage imageNamed:@"1.jpg"],[UIImage imageNamed:@"2.jpg"],[UIImage imageNamed:@"1.jpg"],[UIImage imageNamed:@"2.jpg"],[UIImage imageNamed:@"1.jpg"],[UIImage imageNamed:@"2.jpg"],[UIImage imageNamed:@"1.jpg"],[UIImage imageNamed:@"2.jpg"]];
cell.Img.image = arr[indexPath.row];
//移除cell
for (id subView in cell.contentView.subviews) {
[subView removeFromSuperview];}
NSInteger remainder=indexPath.row%colletionCell;
NSInteger currentRow=indexPath.row/colletionCell;
CGFloat currentHeight=[hArr[indexPath.row] floatValue];
CGFloat positonX=(screenWidth/colletionCell-8)*remainder+5*(remainder+1);
CGFloat positionY=(currentRow+1)*5;
for (NSInteger i=0; i<currentRow; i++){
NSInteger position=remainder+i*colletionCell;
positionY+=[hArr[position] floatValue];}
cell.frame = CGRectMake(positonX, positionY,screenWidth/colletionCell-8,currentHeight) ;//重新定义cell位置、宽高
return cell;}
#pragma mark --UICollectionViewDelegateFlowLayout
//定义每个Item 的大小
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
CGFloat height=100+(arc4random()%120);
[hArr addObject:[NSString stringWithFormat:@"%f",height]];
return CGSizeMake(screenWidth/colletionCell-8, height); //设置cell宽高
}
//定义每个UICollectionView 的 margin
-(UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section
{
return UIEdgeInsetsMake(0,0, 0, 0);
}
#pragma mark --UICollectionViewDelegate
//UICollectionView被选中时调用的方法
-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
CollectionViewCell * cell = (CollectionViewCell *)[collectionView cellForItemAtIndexPath:indexPath];
cell.backgroundColor = [UIColor redColor];
}
//返回这个UICollectionView是否可以被选择
-(BOOL)collectionView:(UICollectionView *)collectionView shouldSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
return YES;
}
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