ios - UICollectionViewCell 阴影颜色

Question

在新的 UICollectionView 中，我看不到如何向 UICollectionViewCell 添加阴影。我该怎么办。我会添加另一个视图吗？

    [self.collectionView cellForItemAtIndexPath:[self.collectionView indexPathForItemAtPoint:[recognizer locationInView:[self view]]]].layer.shadowPath = [UIBezierPath bezierPathWithRect:rect].CGPath;
    [self.collectionView cellForItemAtIndexPath:[self.collectionView indexPathForItemAtPoint:[recognizer locationInView:[self view]]]].layer.shadowColor = [UIColor yellowColor].CGColor;
    [self.collectionView cellForItemAtIndexPath:[self.collectionView indexPathForItemAtPoint:[recognizer locationInView:[self view]]]].layer.shadowRadius = .5;
    [self.collectionView cellForItemAtIndexPath:[self.collectionView indexPathForItemAtPoint:[recognizer locationInView:[self view]]]].layer.shadowOpacity = .1;

在此处输入图像描述

score 42 · Accepted Answer

你忘了设置masksToBounds到. 这应该有效：UIViewNO

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    PhotoCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"PhotoCell" forIndexPath:indexPath];

    cell.layer.masksToBounds = NO;
    cell.layer.borderColor = [UIColor whiteColor].CGColor;
    cell.layer.borderWidth = 7.0f;
    cell.layer.contentsScale = [UIScreen mainScreen].scale;
    cell.layer.shadowOpacity = 0.75f;
    cell.layer.shadowRadius = 5.0f;
    cell.layer.shadowOffset = CGSizeZero;
    cell.layer.shadowPath = [UIBezierPath bezierPathWithRect:cell.bounds].CGPath;
    cell.layer.shouldRasterize = YES;

    return cell;
}

score 2 · Accepted Answer

[self.collectionView cellForItemAtIndexPath:[self.collectionView indexPathForItemAtPoint:[recognizer locationInView:[self view]]]].layer.masksToBounds = NO;

score 1 · Accepted Answer

most likely your problem is best solved with the existing answer to How do I draw a shadow under a UIView?

to be specific to your circumstance, you would probably have code that would do what the following code does (depending upon where you get your collectionView and someIndexPath in order to point to the cell you're interested in):

    UICollectionViewCell* collectionViewCell
      = [collectionView dequeueReusableCellWithReuseIdentifier:DEFINED_IDENTIFIER forIndexPath:someIndexPath];
    collectionViewCell.layer.shadowPath = [UIBezierPath bezierPathWithRect:collectionViewCell.bounds].CGPath;

there are obviously other ways to get the cell. the important thing is the 2nd line, to set the shadowPath.

score 0 · Accepted Answer

0

您没有在图层上设置 shadowOffset 属性。

myCell.layer.shadowOffset = CGSizeMake(10,10);

于 2012-10-11T16:30:04.617 回答

score 0 · Accepted Answer

转到 CustomCollectionviewCell.m 并尝试添加：

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        //////// make shadow  of total view
        self.clipsToBounds = NO;
        self.layer.masksToBounds = NO;
        self.layer.shadowRadius = 5;
        self.layer.shadowOpacity = 0.5;
        self.layer.shadowColor = [UIColor blackColor].CGColor;
        self.layer.shadowOffset = CGSizeMake(0, 1);
        self.layer.shadowPath = [UIBezierPath bezierPathWithRect:self.bounds].CGPath;

        // make radius of the cell
        self.layer.cornerRadius = 5;

    }
    return self;
}

ios - UICollectionViewCell 阴影颜色

5 回答 5

Related

Reference