iOS自定义collectionView实现毛玻璃效果

先来看看效果图，由于录屏软件不给力，毛玻璃效果不明显，请见谅。

步骤详解:

说下思路,很简单,首先自定义一个collectionView, 重写它的initWithFrame:collectionViewLayout:方法,在这里面做配置,这里用的是AXECollectionView.

与之对应的自定义一个collectionViewCell,在cell里配置操作:设置layer涂层,加载图片等操作,这里用的是AXECollectionViewCell.

最后在需要展示的控制器里调用AXECollectionView,给它传入一个自定义的流水布局和图片数组,大功告成.

示例代码如下：

// viewController
@interface ViewController ()

@property (nonatomic, strong) AXECollectionView *collectionView;

@end

@implementation ViewController

- (void)viewDidLoad {
  [super viewDidLoad];

  // 流水布局
  UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
  flowLayout.minimumLineSpacing = kItem_Margin;
  flowLayout.minimumInteritemSpacing = [UIScreen mainScreen].bounds.size.height;
  flowLayout.itemSize = CGSizeMake([UIScreen mainScreen].bounds.size.width - kItem_Margin, kItem_Height);
  flowLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
  flowLayout.sectionInset = UIEdgeInsetsMake(0, kItem_Margin / 2, 0, kItem_Margin / 2);

  CGRect frame = self.view.bounds;
  _collectionView = [[AXECollectionView alloc] initWithFrame:frame collectionViewLayout:flowLayout];

  // 传入图片数组
  _collectionView.imgArr = @[
                @"0",
                @"1",
                @"2",
                @"3",
                @"4",
                @"5",
                @"6",
                @"7",
                ];

  [self.view addSubview:_collectionView];
}

// AXECollectionView.h
@interface AXECollectionView : UICollectionView

@property (nonatomic, strong) NSArray *imgArr;

@end


// AXECollectionView.m
@interface AXECollectionView () <UICollectionViewDelegate, UICollectionViewDataSource>

// 背景imgView
@property (nonatomic, strong) UIImageView *bgImgView;

@end

@implementation AXECollectionView

static NSString *const AXECollectionViewCellID = @"AXECollectionViewCell";

- (instancetype)initWithFrame:(CGRect)frame collectionViewLayout:(UICollectionViewLayout *)layout
{
  if(self = [super initWithFrame:frame collectionViewLayout:layout])
  {
    [self setup];
  }
  return self;
}

- (void)setup
{
  self.showsVerticalScrollIndicator = NO;
  self.showsHorizontalScrollIndicator = NO;
  self.pagingEnabled = YES;
  self.dataSource = self;
  self.delegate = self;
  [self registerClass:[AXECollectionViewCell class] forCellWithReuseIdentifier:AXECollectionViewCellID];

  // collectionView背景view
  UIImageView *bgImgView = [[UIImageView alloc] initWithFrame:self.bounds];
  self.backgroundView = bgImgView;
  self.bgImgView = bgImgView;

  // 毛玻璃效果 (iOS8.0以后适用)
  UIBlurEffect *blurEffect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];
  UIVisualEffectView *effectView = [[UIVisualEffectView alloc] initWithEffect:blurEffect];
  effectView.frame = self.bounds;
  [self.backgroundView addSubview:effectView];
}

#pragma mark - UICollectionViewDataSource

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
  AXECollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:AXECollectionViewCellID forIndexPath:indexPath];
  cell.img = self.imgArr[indexPath.row];

  // 设置毛玻璃图片
  self.bgImgView.image = [UIImage imageNamed:self.imgArr[indexPath.row]];
  return cell;
}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
  return self.imgArr.count;
}

#pragma mark - UICollectionViewDelegate

- (void)collectionView:(UICollectionView *)collectionView willDisplayCell:(UICollectionViewCell *)cell forItemAtIndexPath:(NSIndexPath *)indexPath
{
  AXECollectionViewCell *myCell = (AXECollectionViewCell *)cell;
  [UIView animateWithDuration:0.5 animations:^{
    myCell.transform = CGAffineTransformScale(CGAffineTransformIdentity, 1.0, 1.4);
  }];
}								 
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