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。#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。