iOS实现列表与网格两种视图的相互切换

2020-07-26 03:08:29

字体：大中小

来源：转载

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下图为京东商城的截图

很多人看到这个，第一眼想到的是用TableView和CollectionView来做切换，笔者刚开始也是认为这么做，后来发现还有一个非常的简单方法，就可以实现这个功能。

实现代码

1、首先创建一个CollectionView。

- (UICollectionView *)collectionView{  if (!_collectionView)  {    UICollectionViewFlowLayout *flowlayout = [[UICollectionViewFlowLayout alloc] init];    //设置滚动方向    [flowlayout setScrollDirection:UICollectionViewScrollDirectionVertical];    //左右间距    flowlayout.minimumInteritemSpacing = 2;    //上下间距    flowlayout.minimumLineSpacing = 2;    _collectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(2 , 2 , self.view.bounds.size.width - 4, self.view.bounds.size.height - 4) collectionViewLayout:flowlayout];    _collectionView.delegate = self;    _collectionView.dataSource = self;    _collectionView.showsVerticalScrollIndicator = NO;    _collectionView.showsHorizontalScrollIndicator = NO;    [_collectionView setBackgroundColor:[UIColor clearColor]];    //注册cell    [_collectionView registerClass:[GridListCollectionViewCell class] forCellWithReuseIdentifier:kCellIdentifier_CollectionViewCell];  }  return _collectionView;}

然后去京东商城抓取json数据，再去解析数据装入模型，objectWithDictionary:是将字典转化为模型，这个工具是我用 Runtime 写的，一行代码解析数据。

- (void)viewDidLoad {  [super viewDidLoad];  // Do any additional setup after loading the view, typically from a nib.  // 默认列表视图  _isGrid = NO;  NSString *path = [[NSBundle mainBundle] pathForResource:@"product" ofType:@"json"];  NSData *data = [NSData dataWithContentsOfFile:path];  NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];  [self.view addSubview:self.collectionView];  NSArray *products = dict[@"wareInfo"];  for (id obj in products) {    [self.dataSource addObject:[GridListModel objectWithDictionary:obj]];  }}

再去自定义CollectionViewCell，给cell添加一个属性isGrid，用来判断是列表还是格子视图。

.h文件：

#import <UIKit/UIKit.h>#define kCellIdentifier_CollectionViewCell @"GridListCollectionViewCell"@class GridListModel;@interface GridListCollectionViewCell : UICollectionViewCell/** 0：列表视图，1：格子视图 */@property (nonatomic, assign) BOOL isGrid;@property (nonatomic, strong) GridListModel *model;@end

.m文件

#import "GridListCollectionViewCell.h"#import "GridListModel.h"#import "UIImageView+WebCache.h"#define ScreenWidth ([UIScreen mainScreen].bounds.size.width)@interface GridListCollectionViewCell ()@property (nonatomic, strong) UIImageView *imageV;@property (nonatomic, strong) UILabel *titleLabel;@property (nonatomic, strong) UILabel *priceLabel;@end@implementation GridListCollectionViewCell- (instancetype)initWithFrame:(CGRect)frame{  self = [super initWithFrame:frame];  if (self) {    [self configureUI];  }  return self;}- (void)configureUI{  _imageV = [[UIImageView alloc] initWithFrame:CGRectZero];  [self.contentView addSubview:_imageV];  _titleLabel = [[UILabel alloc] initWithFrame:CGRectZero];  _titleLabel.numberOfLines = 0;  _titleLabel.font = [UIFont boldSystemFontOfSize:14];  [self.contentView addSubview:_titleLabel];  _priceLabel = [[UILabel alloc] initWithFrame:CGRectZero];  _priceLabel.textColor = [UIColor redColor];  _priceLabel.font = [UIFont systemFontOfSize:16];  [self.contentView addSubview:_priceLabel];}- (void)setIsGrid:(BOOL)isGrid{  _isGrid = isGrid;  if (isGrid) {    _imageV.frame = CGRectMake(5, 5, self.bounds.size.width - 60, self.bounds.size.width - 60);    _titleLabel.frame = CGRectMake(5, self.bounds.size.width - 45, ScreenWidth/2, 20);    _priceLabel.frame = CGRectMake(5, self.bounds.size.width - 20, ScreenWidth/2, 20);  } else {    _imageV.frame = CGRectMake(5, 5, self.bounds.size.height - 10, self.bounds.size.height - 10);    _titleLabel.frame = CGRectMake(self.bounds.size.height + 10, 0, ScreenWidth/2, self.bounds.size.height - 20);;    _priceLabel.frame = CGRectMake(self.bounds.size.height + 10, self.bounds.size.height - 30, ScreenWidth/2, 20);;  }}- (void)setModel:(GridListModel *)model{  _model = model;  [_imageV sd_setImageWithURL:[NSURL URLWithString:model.imageurl]];  _titleLabel.text = model.wname;  _priceLabel.text = [NSString stringWithFormat:@"￥%.2f",model.jdPrice];}@end

再添加一个切换视图的按钮，按钮的点击事件如下：

#pragma mark - Action- (IBAction)onBtnClick:(id)sender{  _isGrid = !_isGrid;  [self.collectionView reloadData];  if (_isGrid) {    [self.swithBtn setImage:[UIImage imageNamed:@"product_list_grid_btn"] forState:0];  } else {    [self.swithBtn setImage:[UIImage imageNamed:@"product_list_list_btn"] forState:0];  }}

最后还要设置一下切换时的CollectionView的ItemSize。

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath{  if (_isGrid) {    return CGSizeMake((ScreenWidth - 6) / 2, (ScreenWidth - 6) / 2 + 40);  } else {    return CGSizeMake(ScreenWidth - 4, (ScreenWidth - 6) / 4 + 20);  }}

这样子就大体实现了列表视图和网格视图的相互切换，是不是很简单。