IOS开发基础之网易新闻UICollectionView的使用第3天

由于第3天的UICollectionView 并不实现，我查阅相关资料，也没解决，先从本地的plist加载的数据，不是网络的上的数据。有一定的参考意义。
父类是UIViewController 通过纯代码添加进去的，addSubView 方式添加进去的，这跟UITableViewController类似，可以拖控件，指定相应的类，但是这种方法并没有学会。源码在我的主页下面。等回头这块知识健全了，再补充回来。

//
//  ViewController.m
//  imageRunLoop1
//
//  Created by 鲁军 on 2021/4/11.
//#import "HMImageLoopController.h"
#import "YYCell.h"
#import "YYNews.h"
#define kWidth [UIScreen mainScreen].bounds.size.width
#define kHeight [UIScreen mainScreen].bounds.size.height
#define MaxSections 100
@interface HMImageLoopController()<UICollectionViewDataSource,UICollectionViewDelegate>
@property (nonatomic , strong) UICollectionView *collectionView;
@property (nonatomic , strong) UIPageControl *pageControl;
@property (nonatomic , strong) NSMutableArray *newses;
@property (nonatomic , strong) NSTimer *timer;
@property (nonatomic, strong) NSMutableArray *news;
@end
@implementation HMImageLoopController
-(NSArray *)newses{if (_newses == nil) {NSBundle *bundle = [NSBundle mainBundle];NSString *path =[bundle pathForResource:@"resource.plist" ofType:nil];NSArray *array = [NSArray arrayWithContentsOfFile:path];_newses=[NSMutableArray array];for (NSDictionary *dict in array) {[_newses addObject: [YYNews newsWithDict:dict]];}}return  _newses;
}- (void)viewDidLoad{[super viewDidLoad];[self.view addSubview:self.collectionView];[self.view addSubview:self.pageControl];// 注册cell[self.collectionView registerClass:[YYCell class] forCellWithReuseIdentifier:@"Cell"];// 添加定时器 实现轮播功能呢[self addTimer];}- (void)addTimer
{_timer = [NSTimer scheduledTimerWithTimeInterval:8.0 target:self selector:@selector(nextPage) userInfo:NULL repeats:YES];}
// 定时器的内容
- (void)nextPage
{// 获取当前的 indexPathNSIndexPath *currentIndexPath = [[self.collectionView indexPathsForVisibleItems] lastObject];NSIndexPath *currentIndexPathSet = [NSIndexPath indexPathForItem:currentIndexPath.item inSection:MaxSections / 2];[self.collectionView scrollToItemAtIndexPath:currentIndexPathSet atScrollPosition:UICollectionViewScrollPositionLeft animated:NO];// 设置下一个滚动的item的indexPathNSInteger nextItem = currentIndexPathSet.item + 1;NSInteger nextSection = currentIndexPathSet.section;if (nextItem == self.news.count) {// 当item等于轮播图的总个数的时候// item等于0, 分区加1// 未达到的时候永远在50分区中nextItem = 0;nextSection ++;}// NSLog(@"----%ld---%ld", nextItem, nextSection);NSIndexPath *nextIndexPath = [NSIndexPath indexPathForItem:nextItem inSection:nextSection];[self.collectionView scrollToItemAtIndexPath:nextIndexPath atScrollPosition:UICollectionViewScrollPositionLeft animated:YES];
}#pragma mark ----ScrollView 代理方法
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{// 添加定时器[self addTimer];
}
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{// 移除定时器[self.timer invalidate];self.timer = nil;
}-(void)scrollViewDidScroll:(UIScrollView *)scrollView
{// 滚动时 动态设置 pageControl.currentPage//int page = (int)(scrollView.contentOffset.x / scrollView.frame.size.width + 0.5) % self.news.count;int page = (int)(scrollView.contentOffset.x / scrollView.frame.size.width + 0.5) % 5;self.pageControl.currentPage = page;
}#pragma mark ---- 创建集合视图// 创建集合视图
- (UICollectionView *)collectionView
{if (!_collectionView) {// 创建UICollectionViewFlowLayout约束对象UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];// 设置item的Size大小flowLayout.itemSize = CGSizeMake(kWidth, kHeight);// 设置uicollection 的 横向滑动flowLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal;flowLayout.minimumLineSpacing = 0;_collectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(0, 0, kWidth, kHeight) collectionViewLayout:flowLayout];// 设置代理_collectionView.delegate = self;_collectionView.dataSource = self;// 设置不展示滑动条_collectionView.showsHorizontalScrollIndicator = NO;// 设置整页滑动_collectionView.pagingEnabled = YES;_collectionView.backgroundColor = [UIColor clearColor];// 设置当前collectionView 到哪个位置(indexPath row 0 section 取中间(50个))[self.collectionView scrollToItemAtIndexPath:[NSIndexPath indexPathForItem:0 inSection:MaxSections / 2] atScrollPosition:UICollectionViewScrollPositionLeft animated:YES];}return _collectionView;}- (UIPageControl *)pageControl
{if (!_pageControl) {UIPageControl *pageControl = [[UIPageControl alloc] init];pageControl.center = CGPointMake(kWidth / 2, kHeight - 100);pageControl.numberOfPages = _news.count;pageControl.bounds = CGRectMake(0, 0, 150, 40);pageControl.enabled = NO;pageControl.pageIndicatorTintColor = [UIColor blueColor];pageControl.currentPageIndicatorTintColor = [UIColor redColor];[self.view addSubview:pageControl];_pageControl = pageControl;}return _pageControl;
}
#pragma mark --- 数据源
- (NSMutableArray *)news
{if (!_news) {NSString *path = [[NSBundle mainBundle] pathForResource:@"resource.plist" ofType:nil];NSArray *arr = [NSArray arrayWithContentsOfFile:path];_news = [NSMutableArray array];for (NSDictionary *dic1 in arr) {[_news addObject:[YYNews newsWithDict:dic1]];}}return _news;
}
/**[HMHeadline headlines:^(NSArray * _Nonnull array) {self.headlines = array;} errorBlock:^(NSError * _Nonnull err) {NSLog(@"出错了");}];*/#pragma mark --- 实现collectionView代理方法
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{return MaxSections;
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{return self.news.count;}- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{static NSString *string = @"Cell";YYCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:string forIndexPath:indexPath];if (!cell) {cell = [[YYCell alloc] init];}cell.news = self.news[indexPath.row];return cell;
}
@end

//
//  YYCell.m
//  图片轮播（无限循环）
//
//  Created by yixiang on 14/12/12.
//  Copyright (c) 2014年 yixiang. All rights reserved.
//#import "YYCell.h"
#import "YYNews.h"@interface YYCell()
@property (weak , nonatomic)  UILabel *label;
@property (weak , nonatomic)  UIImageView *imageView;
@end
@implementation YYCell-(instancetype)initWithFrame:(CGRect)frame{self =[super initWithFrame:frame];if (self) {UIImageView *img = [[UIImageView alloc] init];[self.contentView addSubview:img];self.imageView = img;UILabel *lab = [[UILabel alloc] init];[self.contentView addSubview:lab];self.label = lab;}return self;
}-(void)setNews:(YYNews *)news
{_news=news;[self settingData];[self settingFrame];
}#pragma mark 给子控件赋值
-(void) settingData{self.imageView.image = [UIImage imageNamed:_news.icon];self.label.text = _news.title;}#pragma mark 设置子控件的frame
-(void) settingFrame{CGFloat screenWidth = self.contentView.frame.size.width;self.imageView.frame = CGRectMake(0, 0, screenWidth, 200);self.label.frame = CGRectMake(0, 0, screenWidth, 200);self.label.font = [UIFont systemFontOfSize:30];self.label.textAlignment = NSTextAlignmentCenter;
}@end

#import <UIKit/UIKit.h>
@class YYNews;@interface YYCell : UICollectionViewCell
@property (nonatomic, strong) YYNews *news;
@end

#import <Foundation/Foundation.h>@interface YYNews : NSObject
@property (nonatomic, copy) NSString *title;
@property (nonatomic, copy) NSString *icon;-(id)initWithDict:(NSDictionary *)dict;
+(id)newsWithDict : (NSDictionary *) dict;
@end

#import "YYNews.h"@implementation YYNews-(id)initWithDict:(NSDictionary *)dict{if (self=[super init]) {self.title = dict[@"title"];self.icon = dict[@"icon"];}return self;
}+(id)newsWithDict:(NSDictionary *)dict{return [[self alloc] initWithDict:dict];
}
@end

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IOS开发基础之网易新闻UICollectionView的使用第3天

IOS开发基础之网易新闻UICollectionView的使用第3天

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