import "ViewController.h"
@interface ViewController ()<UICollectionViewDelegate,UICollectionViewDataSource>
{
UICollectionView *collection; //网格视图
}
@end
//设置可重用标识符
static NSString * const reuseID = @"cell";
@implementation ViewController
-
(void)viewDidLoad {
[super viewDidLoad];//创建一个布局对象
UICollectionViewFlowLayout *flowlayout = [[UICollectionViewFlowLayout alloc]init];//设置每个格子的大小
flowlayout.itemSize = CGSizeMake(100, 100);//设置每个格子的最小水平间距
flowlayout.minimumInteritemSpacing = 20;//设置行间距 最小行间距
flowlayout.minimumLineSpacing = 20;//设置组与组之间的间隔
flowlayout.sectionInset = UIEdgeInsetsMake(50, 10, 0, 10);
//创建网格对象
collection = [[UICollectionView alloc]initWithFrame:self.view.frame collectionViewLayout:flowlayout];//设置代理
collection.delegate = self;
collection.dataSource = self;//设置网格背景颜色
collection.backgroundColor = [UIColor greenColor];//注册cell
[collection registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:reuseID];//将网格添加到父视图上
[self.view addSubview:collection];
}
//=========数据源方法=========
//设置组数
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
return 5;
}
//设置行数
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
return 5;
}
//设置 cell 内容
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
//根据可重用标识符查找cell
UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseID forIndexPath:indexPath];
//设置cell的背景颜色
cell.backgroundColor = [UIColor colorWithRed:((float)arc4random_uniform(256) / 255.0)green:((float)arc4random_uniform(256) / 255.0)blue:((float)arc4random_uniform(256) / 255.0)alpha:1.0];
return cell;
}
