September 2002
Intermediate to advanced
1272 pages
31h 12m
English
Content preview from Cocoa® Programming
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Common Runtime Functions
Several runtime functions are commonly used in Cocoa applications. The NSStringFromSelector(SEL) function converts selectors into strings. The following line of code can be placed in any method implementation to output the name of the method:
NSLog(@"%@", NSStringForSelector(_cmd));
The NSSelectorFromString(NSString *) function returns the selector if any that corresponds to a string.
The NSClassFromString(NSString *) function returns the class identified by a string name. The following lines of code can be used to send a user specified message to a user specified class object:
void MYSendMessageToAClass(NSString *className, NSString *messageName) { [NSClassFromString(className) performSelector: NSSelectorFromString(messageName)]; ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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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.