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SEUICollectionViewLayout:一个基本的集合视图,简化了替代视图的绘图动画
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2021-05-15
02:16:14
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SEUICollectionViewLayout SEUICollectionViewLayout是用于编写自定义UICollectionViewLayout子类的增强的基类。 它使用自己的机制来注册视图以及为补充视图和装饰视图设置动画,因此您只需要编写prepareLayout和layoutAttributesForElementsInRect: 。 调查演示 该演示是用Swift编写的,展示了如何通过告诉布局跳过绘图而不是操纵模型来从布局中插入和删除视图。 调查项目是根据可见性定义的: { " id " : " lang-ios-swift " , " show-if " : " lang-ios=true " } 更改值时,KVO更新hidden字段,这会触发布局无效: survey. hidingChangedCallback = { [ unowned self
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