What is NSAssert1?

ios objective-c nsassert
Getsy picture Getsy · Mar 31, 2011 · Viewed 8.7k times · Source

I am developing an application on iOS. I see there is a macro called NSAssert1. What is it for? What are the differences in usage between NSLog and NSAssert1?

Please guide me or suggest a tutorial where I can read about it.

Answer

user457812 picture user457812 · Mar 31, 2011

NSAssert variants take a condition and a message. If the condition isn't met/true, then the assertion fails and NSAssert raises an exception with the message provided. For example, NSAssert((a == b), @"Error message"); will raise an exception when a is not equal to b. NSAssert1 is a variant that takes an additional argument and inserts it into the format string provided, like so: NSAssert1((a == b), @"Error message: %@", someErrorString);

NSLog will just write something to the console.

Documentation for all of those macros is on Apple's developer site.

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