December 2019
Beginner
1201 pages
33h 24m
English
Content preview from Programming iOS 13
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Chapter 17. Photo Library and Camera
The stored photos and videos accessed by the user through the Photos app constitute the device’s photo library:
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The UIImagePickerController class can be used to give the user an interface for exploring the photo library and choosing a photo.
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The Photos framework, also known as PhotoKit, lets you access the photo library and its contents programmatically — including the ability to modify a photo’s image. You’ll need to
import Photos.
The user’s device may include one or more cameras, and your app might want to let the user take (capture) a photo or video:
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The UIImagePickerController class can be used to give the user an interface similar to the Camera app, letting the user capture photos and videos.
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At a deeper level, the AV Foundation framework (Chapter 15) provides direct control over the camera hardware. You’ll need to
import AVFoundation.
The two subjects are related, especially because having allowed the user to capture an image, you will typically store it in the photo library, just as the Camera app does. So this chapter treats them together.
Constants such as kUTTypeImage, referred to in this chapter, are provided by the Mobile Core Services framework; you’ll need to import MobileCoreServices.
Browsing with UIImagePickerController
UIImagePickerController is a view controller providing an interface in which the user can choose an item from the photo library, similar to the Photos app. You are expected to treat the UIImagePickerController ...
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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.