January 2023
Intermediate to advanced
288 pages
6h 6m
Chinese
Content preview from 移动端AI与ML应用开发：基于iOS和Android
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第
6
章
6.1.3
第
3
步：设置故事板
名为
main.storyboard
的故事板文件将包含你的应用程序的用户界面。向其添加 UIImage
视图并将其属性设置为 Aspect Fit。然后，添加一个按钮控件，将其文本更改为“ Do
Inference”。最后添加一个 UILabel 并使用属性检查器将其 Lines 属性设置为“0”，以
确保它具有多行文本属性。调整标签大小以提供足够的空间。完成后，你的故事板应如
图 6-4 所示。
图
6-4
：创建简单的故事板
接下来，你需要为图像和标签控件创建输出，并为按钮创建一个动作。为此，你可以打
开一个单独的窗口并将控件拖动到
ViewController.swift
文件中。如果你对此不熟悉，请
返回第 3 章查看详细示例。
关于何时需要输出和何时需要动作可能会令人困惑，所以我喜欢这样思考。如果你想
读取或设置控件的属性，则需要一个“ outlet”（ 输 出）。例如，我们需要读取图像视图
控件的内容以传递给 ML Kit 对其进行分类。你还需要写入标签的内容来呈现结果。因
此，它们都需要设置一个输出，该输出的名称是你在代码中引用这些控件的方式。当
你需要响应用户对控件执行某些操作时（例如按下按钮），你需要一个“动作”。当你将
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.