iOS实现列表与网格两种视图的相互切换

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;
}

- (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]];
  }
}

#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								 
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