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。
总结
以上就是这篇文章的全部内容了，可能由于笔者水平有限，文中如果有错误的地方，还望大家能够指出。或者有更好的方法和建议，我们也可以一起交流。希望这篇文章的内容对大家能有所帮助。
