UICollectionViewFlowLayout使用示例

//
//  ViewController.m
//  LayoutViewController
//
//  Created by YouXianMing on 16/5/3.
//  Copyright © 2016年 YouXianMing. All rights reserved.
//

#import "ViewController.h"
#import "UIView+SetRect.h"
#import "RootModel.h"
#import "FlowStyleCell.h"
#import "CollectionHeaderView.h"
#import "CollectionBottomView.h"

@interface ViewController () <UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout>

@property (nonatomic, strong) RootModel         *rootModel;
@property (nonatomic, strong) UICollectionView  *collectionView;

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

[self createDataSource];

[self createCollectionView];
}

#pragma mark - Create data source.

- (void)createDataSource {

NSDictionary *datas = @{@"response" : @YES,
@"datas"    : @[@{@"title"    : @"Header1",
@"subTitle" : @"Bottom1",
@"infos"    : @[@{@"name" : @"1"}, @{@"name" : @"2"},
@{@"name" : @"3"}, @{@"name" : @"4"},
@{@"name" : @"5"}, @{@"name" : @"6"},
@{@"name" : @"7"}, @{@"name" : @"8"},
@{@"name" : @"9"}]},
@{@"title"    : @"Header2",
@"subTitle" : @"Bottom2",
@"infos"    : @[@{@"name" : @"1"}, @{@"name" : @"2"},
@{@"name" : @"3"}, @{@"name" : @"4"},
@{@"name" : @"5"}, @{@"name" : @"6"}]},
@{@"title"    : @"Header3",
@"subTitle" : @"Bottom3",
@"infos"    : @[@{@"name" : @"1"}, @{@"name" : @"2"},
@{@"name" : @"3"}, @{@"name" : @"4"},
@{@"name" : @"5"}, @{@"name" : @"6"},
@{@"name" : @"7"}, @{@"name" : @"8"}]}]};
self.rootModel = [[RootModel alloc] initWithDictionary:datas];
}

#pragma mark - Create UICollectionView.

- (void)createCollectionView {

self.view.backgroundColor = [UIColor whiteColor];

// Setup UICollectionViewFlowLayout.
UICollectionViewFlowLayout *layout = [UICollectionViewFlowLayout new];
layout.itemSize                    = CGSizeMake(90, 120);
layout.sectionInset                = UIEdgeInsetsMake(0, 0, 0, 0);
layout.minimumInteritemSpacing     = 10.f; // 横向排列最小间距
layout.minimumLineSpacing          = 5.0f; // 纵向排列最小间距

// Init UICollectionView.
self.collectionView                 = [[UICollectionView alloc] initWithFrame:self.view.bounds collectionViewLayout:layout];
self.collectionView.backgroundColor = [UIColor clearColor];
self.collectionView.delegate        = self;
self.collectionView.dataSource      = self;

// Register CollectionHeaderView & CollectionBottomView.
[self.collectionView registerClass:[FlowStyleCell class] forCellWithReuseIdentifier:@"FlowStyleCell"];
[self.collectionView registerClass:[CollectionHeaderView class]
forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"CollectionHeaderView"];
[self.collectionView registerClass:[CollectionBottomView class]
forSupplementaryViewOfKind:UICollectionElementKindSectionFooter withReuseIdentifier:@"CollectionBottomView"];

[self.view addSubview:self.collectionView];
}

#pragma mark - UICollectionView's delegate & dataSource.

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

DatasModel *dataModel = self.rootModel.datas[section];

return dataModel.infos.count;
}

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

return self.rootModel.datas.count;
}

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

DatasModel *dataModel = self.rootModel.datas[indexPath.section];
InfoModel  *infoModel = dataModel.infos[indexPath.row];

FlowStyleCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"FlowStyleCell" forIndexPath:indexPath];
cell.data           = infoModel;
cell.indexPath      = indexPath;
[cell loadContent];

return cell;
}

- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView
viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath {

CustomCollectionReusableView *reusableView = nil;

if ([kind isEqualToString:UICollectionElementKindSectionHeader]) {

reusableView = [collectionView dequeueReusableSupplementaryViewOfKind:kind withReuseIdentifier:@"CollectionHeaderView"
forIndexPath:indexPath];

DatasModel *dataModel  = self.rootModel.datas[indexPath.section];
reusableView.data      = dataModel;
reusableView.indexPath = indexPath;
[reusableView loadContent];

} else if ([kind isEqualToString:UICollectionElementKindSectionFooter]) {

reusableView = [collectionView dequeueReusableSupplementaryViewOfKind:kind withReuseIdentifier:@"CollectionBottomView"
forIndexPath:indexPath];

DatasModel *dataModel  = self.rootModel.datas[indexPath.section];
reusableView.data      = dataModel;
reusableView.indexPath = indexPath;
[reusableView loadContent];
}

return reusableView;
}

#pragma mark - UICollectionViewDelegateFlowLayout.

- (CGSize)collectionView:(UICollectionView *)collectionView
layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section {

// If you have headerView, you must implement this method.
return CGSizeMake(Width, 30);
}

- (CGSize)collectionView:(UICollectionView *)collectionView
layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForFooterInSection:(NSInteger)section {

// If you have footerView, you must implement this method.
return CGSizeMake(Width, 40);
}

#pragma mark - Hide statusBar.

- (BOOL)prefersStatusBarHidden {

return YES;
}

@end