iOS UICollectionView 完全指南：第二版

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"AWP.iOS.UICollectionView.2nd.Edition，一本深入探讨iOS开发中UICollectionView使用的教程。" 在iOS开发中，UICollectionView是一个强大的组件，用于展示和管理可自定义布局的可滚动视图集合。它是苹果iOS SDK中的核心部分，允许开发者以灵活的方式展示大量数据，如网格、列表或者其他复杂布局。这本《UICollectionView: The Complete Guide 2nd Edition》由Ash Furrow撰写，是Addison-Wesley Mobile Programming Series系列的一部分，旨在为开发者提供详尽的UICollectionView使用指南。本书涵盖了以下关键知识点： 1. **UICollectionView基础**：讲解了如何创建并设置UICollectionView的基本结构，包括初始化、配置UICollectionViewFlowLayout，以及设置代理和数据源方法。 2. **自定义布局**：深入介绍了如何创建自定义UICollectionViewLayout，以实现独特的滚动效果和展示方式，比如瀑布流、棋盘格布局等。 3. **Cell和 Supplementary Views**：讨论了如何设计和重用UICollectionViewCell以及Header和Footer等Supplementary Views，确保高效地显示内容。 4. **交互与动画**：涵盖用户交互事件处理，如点击、拖动和缩放，以及如何在UICollectionView中添加平滑的过渡和动画效果。 5. **性能优化**：讨论了在处理大量数据时，如何通过内存管理、预加载策略和异步加载来优化UICollectionView的性能。 6. **实时更新与动态内容**：介绍如何在应用运行时动态添加、删除或修改UICollectionView的内容，保持视图与数据模型的一致性。 7. **响应式设计**：探讨如何利用UICollectionView适应不同屏幕尺寸和设备方向，实现响应式界面设计。 8. **扩展与最佳实践**：分享了一些高级技巧和最佳实践，如单元格的复用策略、滚动性能的提升等。完成本书的学习后，开发者将能够充分利用UICollectionView的功能，构建出具有高度交互性和视觉吸引力的iOS应用。书中提供的代码示例可直接用于项目开发，有助于读者快速上手并熟练掌握UICollectionView的使用。此外，读者还可以访问informit.com/mobile获取更多关于移动编程系列的出版物信息，以及通过informit.com/socialconnect与作者和其他开发者进行互动交流，获取最新的开发资讯和技术支持。

ptg12441863

house the network access code. As discussed in Chapter 6, “Adding Interactivity to

UICollectionView

,” the network code should be placed

outside

of the typical MVC

pyramid. Network access should not involve the view whatsoever, but it can sometimes

involve the model.

Well, that’s

mostly

true. In fact, a common paradigm for fetching details about a model

from an application programming interface (API) involves Grand Central Dispatch blocks.

A block lets developers treat anonymous functions as first-class Objective-C objects. These

blocks can be invoked later. Controllers can start a network request and pass the network-

fetching object a callback block that updates the view. Technically, the network code has an

indirect reference to the view, but you ignore it lest you find yourself falling down a rabbit

hole of pedantry.

If you are experienced in iOS development, all of this should sound familiar.

UICollec-

tionView

and

UICollectionViewController

don’t exist in silos; they are used within

applications with models and with the rest of CocoaTouch. It would be irresponsible to

present them in any other context than that of MVC.

MVC and

UICollectionView

Now that you've read about the MVC paradigm, look at its application in the context of

writing

UICollectionView

code.

The view component of MVC with

UICollectionView

is unsurprisingly the

UICollectionView

itself; the controller is either a subclass of

UICollectionView-

Controller

or a subclass of

UIViewController

that conforms to the

UICollection-

ViewDataSource

and

UICollectionViewDelegate

protocols; the model can be

anything.

Like with

UITableView

, your controller can either subclass

UIViewController

and

conform to the two protocols for the collection view data source and delegate or it can

subclass

UICollectionViewController

itself. If you look in the header file of

UICollectionViewController

, you see that it’s very sparse. The controller inherits

from

UIViewController

—conforming to

UICollectionViewDataSource

and

UICollectionViewDelegate

—and has a convenience initializer to programmatically

create an instance of it using a collection view with a specific layout. It contains a property

to access the collection view and another property to specify whether the selection in a

collection view becomes cleared when it (re)appears.

When using a

UICollectionViewController

subclass, the

view

property of

UIViewController

points to the same object as the

collectionView

property of

UICollectionViewController

. The view

the collection view. If you plan to use only

UICollectionView

to display data to your user, I strongly recommend subclassing this

prebuilt controller. In my experience, you run into fewer “gotchas” using these special

controllers from Apple.

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iOS UICollectionView 完全指南：第二版

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