January 2020
Intermediate to advanced
356 pages
6h 4m
Chinese
Content preview from Swift游戏开发经典实例
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322
｜
第
10
章
图
10
-
7
：一个 ARKit APP
10.10 AR
场景的点击测试
问题
你想判断何时用户点击了
ARKit
视图中真实世界的某个地方，然后在用户点击的地
方创建一个对象。
使用外设
｜
323
解决方案
要检测用户点击在真实世界中的哪个位置，首先需要算出用户点击了屏幕的哪个位
置。在知道屏幕位置之后，将这个位置传递给
ARKit
，让它计算出真实世界的坐标。
首先，需要在你的
ARSCNView
中添加一个轻击手势识别器。
本例参考了
10.9
节。
1.
打开
Main.storyboard
，在
Object Library
中，搜索
tap gesture recognizer
。然后
将它拖进
ARSCNView
中。
2.
在
Outline
窗口中找到
Tap Gesture Recognizer
（如果找不到
Outline
窗口，请点
击画布左下角的按钮）。
3.
打开助手编辑器。
4.
按住
Ctrl
键，从
Tap Gesture Recognizer
拖一条线到
ViewController
类源代
码。当连接窗口弹出时，设置
type
为
Action
，
name
为
sceneTapped
。点击
Connect
，将在源代码中添加一个方法。
在添加
IBAction
时，会生成一个方法，这个方法有一个参数，代表了触发这个动
作的对象。 ...
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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.