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Swift Essentials

You're reading from   Swift Essentials Get up and running lightning fast with this practical guide to building applications with Swift

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Product type Paperback
Published in Dec 2014
Publisher
ISBN-13 9781784396701
Length 228 pages
Edition 1st Edition
Languages
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Authors (2):
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Bandlem Limited Bandlem Limited
Author Profile Icon Bandlem Limited
Bandlem Limited
Alex Blewitt Alex Blewitt
Author Profile Icon Alex Blewitt
Alex Blewitt
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Toc

Advanced techniques

The playground has its own framework, XCPlayground, which can be used to perform certain tasks. For example, individual values can be captured during loops for later analysis. It also permits asynchronous code to continue to execute once the playground has finished running.

Capturing values explicitly

It is possible to explicitly add values to the timeline by importing the XCPlayground framework and calling XCPCaptureValue with a value that should be displayed in the timeline. This takes an identifier, which is used both as the title and for group-related data values in the same series. When the value history button is selected, it essentially inserts a call to XCPCaptureValue with the value of the expression as the identifier.

For example, to add the logo to the timeline automatically:

import XCPlayground
XCPCaptureValue("logo",logo)
Capturing values explicitly

It is possible to use an identifier to group the data that is being shown in a loop with the identifier representing categories of...

You have been reading a chapter from
Swift Essentials
Published in: Dec 2014
Publisher:
ISBN-13: 9781784396701
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