ios - UICollectionView 中的动画自定义布局
<p><p>我需要创建一个如下图所示的 UICollectionView。</p>
<p> <a href="/image/N5CNC.png" rel="noreferrer noopener nofollow"><img src="/image/N5CNC.png" alt="enter image description here"/></a> </p>
<p>我已经能够使水平滚动，但无法使 UI 像图片一样。有什么帮助吗？谢谢。</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>这就是你想要的，你只需要一个自定义的 UICollectionViewFlowLayout，并重写方法 <code>-(NSArray<UICollectionViewLayoutAttributes *> *)layoutAttributesForElementsInRect:(CGRect)rect</code> 来改变单元格显示属性.</p>
<p> <a href="/image/Gnd1R.png" rel="noreferrer noopener nofollow"><img src="/image/Gnd1R.png" alt="enter image description here"/></a> </p>
<p>这是每个主要操作中带有注释的布局代码</p>
<pre><code>@implementation HorizonSclaeLayout
-(instancetype)init{
self = ;
if (self) {
self.scrollDirection = UICollectionViewScrollDirectionHorizontal;
}
return self;
}
static const CGFloat kMaxDistancePercentage = 0.3f;
static const CGFloat kMaxRotation = 0;//(CGFloat)(70.0 * (M_PI / 180.0));
static const CGFloat kMaxZoom = 0.6f;
-(NSArray<UICollectionViewLayoutAttributes *> *)layoutAttributesForElementsInRect:(CGRect)rect{
//1 the visible rectangle of the collection view, calculated using the content offset of the view and the bounds size.
CGRect visibleRect = (CGRect){
.origin = self.collectionView.contentOffset,
.size = self.collectionView.bounds.size
};
//2 the maximum distance away from the center, which defines the distance from the center at which each cell is fully rotated
CGFloat maxDistance = visibleRect.size.width/2;
NSArray *array = ;
for (UICollectionViewLayoutAttributes *attributes in array) {
//3 find the distance of the cell from the center of the current visible rectangle
CGFloat distance = CGRectGetMidX(visibleRect) - attributes.center.x;
//4 normalize this distance against the maximum distance to give a percentage of how far the view is along the line from the center to the maximum points in either direction
CGFloat normalizedDistance = distance / maxDistance;
normalizedDistance = MIN(normalizedDistance, 1.0f);
normalizedDistance = MAX(normalizedDistance, -1.0f);
//5 calculate the rotation and zoom
CGFloat rotation = normalizedDistance * kMaxRotation;
CGFloat zoom = 1.0f + ((1.0f - ABS(normalizedDistance))*kMaxZoom);
//6 create the required transform by first setting m34 so that when the rotation is done
// skew is applied to make it have the appearance of coming out of and going into the screen
CATransform3D transform = CATransform3DIdentity;
transform.m34 = - 1.0 / 550.0;
transform = CATransform3DRotate(transform, rotation, 0.0f, 1.0f, 0.0f);
transform = CATransform3DScale(transform, zoom, zoom, 0.0f);
attributes.transform3D = transform;
}
return array;
}
-(CGSize)itemSize{
return CGSizeMake(60, 60 * 1.2);
}
-(CGFloat)minimumLineSpacing{
return 30;
}
-(BOOL)shouldInvalidateLayoutForBoundsChange:(CGRect)newBounds{
return YES;
}
@end
</code></pre></p>
<p style="font-size: 20px;">关于ios - UICollectionView 中的动画自定义布局，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/41207199/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/41207199/
</a>
</p>
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