March 2014
Intermediate to advanced
672 pages
40h 11m
English
Content preview from The Core iOS Developer’s Cookbook, Fifth Edition
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Testing URLs
You can test whether a URL service is available. If the UIApplication’s canOpenURL: method returns YES, you are guaranteed that openURL: can launch another application to open that URL:
if ([[UIApplication sharedApplication] canOpenURL:aURL]) [[UIApplication sharedApplication] openURL:aURL];
You are not guaranteed that the URL is valid—only that its scheme is registered properly to an existing application.
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