Swift版iOS Apprentice：构建检查列表应用

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"iOS_Apprentice_2_Checklists_v3.0" 这本资源是《The iOS Apprentice》（第三版）的Checklists部分，由Matthijs Hollemans编写，专注于SWIFT语言和iOS 8的开发。这本书是Razeware LLC的版权作品，未经许可禁止复制或分发。作者和版权所有者对软件或源代码的使用不提供任何明示或暗示的保证，包括但不限于适销性、特定用途适用性和非侵权的保证。他们不对因软件或其使用而产生的任何索赔、损害或其他责任负责。书中内容主要分为以下几个部分： 1. **你自己的待办事项应用** 这部分可能是引导读者创建一个基本的待办事项应用，学习如何在iOS平台上构建用户界面和数据管理的基础知识。这通常会涉及UI设计，如使用UILabels、Buttons等元素，以及如何处理用户交互和数据存储。 2. **玩转表格视图** 表格视图（UITableView）是iOS开发中的重要组件，用于展示列表数据。这部分可能会讲解如何设置和定制表格视图，包括行的创建、复选框的添加、数据源方法的实现，以及如何响应用户的选择事件。 3. **模型-视图-控制器（MVC）模式** MVC是一种常见的软件设计模式，对于iOS开发尤其重要。在这里，读者将学习如何分离应用程序的数据（模型）、用户界面（视图）和业务逻辑（控制器）。理解并正确使用MVC可以帮助保持代码结构清晰，便于维护和扩展。 4. **向检查列表中添加新条目** 这一章节可能深入讨论如何动态地向应用的检查列表中添加新的项目。这涉及到数据模型的更新、表格视图的刷新，以及可能的用户输入验证。通过这些内容，初学者可以系统地学习到iOS应用的基本构造和交互方式，为之后更复杂的开发打下基础。书中的源代码也会帮助读者更好地理解和实践书中的概念，提升Swift编程技能。

The iOS Apprentice (Third Edition) Checklists

Sometimes it can be hard to see exactly what is selected, so keep an eye on the

outline pane to make sure you’ve picked the right thing.

! Drag a Label from the Object Library into this cell. Make sure the label spans the

entire width of the cell (but leave a small margin on the sides).

Adding the label to the prototype cell

Besides the label you will also add a checkmark to the cell’s design. The checkmark

is provided by something called the accessory, which is a built-in subview that

appears on the right side of the cell. You can choose from a few standard accessory

controls or provide your own.

! Select the Table View Cell again. Inside the Attributes inspector set the

Accessory field to Checkmark:

Changing the accessory to get a checkmark

(If you don’t see this option, then make sure you selected the Table View Cell, not

the Content View or Label below it.)

Your design now looks like this:

The design of the prototype cell: a label and a checkmark

You may want to resize the label a bit so that it doesn’t overlap the checkmark.

The iOS Apprentice (Third Edition) Checklists

Your implementation of tableView(numberOfRowsInSection) – the first method that

you added – returns the value 1. This tells the table view that you just have one

row of data.

The return statement is very important in Swift. It allows a method to send data

back to its caller. In the case of tableView(numberOfRowsInSection), the caller is the

UITableView object and it wants to know how many rows are in the table.

The statements inside a method usually perform some kind of computation using

instance variables and any data received through the method’s parameters. When

the method is done, return says, “Hey, I’m done. Here is the answer I came up

with.” The return value is often called the result of the method.

For tableView(numberOfRowsInSection) the answer is really simple: there is only one

row, so return 1.

Now that the table view knows it has one row, it calls the second method you

added – tableView(cellForRowAtIndexPath) – to obtain a cell for that row. This

method grabs a copy of the prototype cell and gives that back to the table view,

again with a return statement.

Inside tableView(cellForRowAtIndexPath) is also where you would normally put the

row data into the cell, but the app doesn’t have any row data yet.

! Run the app and you’ll see there is a single cell in the table:

The table now has one row

Notice how the iPhone’s status bar partially overlaps the table view. This is new as

of iOS 7. On previous versions of iOS the status bar had its own separate area, but

now it is simply drawn on top of the view controller.

Later in this chapter you will fix this small cosmetic problem by placing a navigation

bar on top of the table view.

Note: It’s possible you’re getting the following message in the Xcode debug

pane: “Warning once only: Detected a case where constraints ambiguously

suggest a height of zero for a table view cell’s content view, yadda yadda

yadda.” I think this is a bug in Xcode or iOS 8.0; in any case, you’ll make

some changes to the table view later that will make this warning go away.

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