try & catch in iPhone?

Question

The try{}catch construct is common to C++, Java & related languages. In the iOS SDK is there and any functionality like this?

possible duplicate of [Try-catch exception handling practice for iPhone/Objective-C](http://stackoverflow.com/questions/3678438/try-catch-exception-handling-practice-for-iphone-objective-c) — ceejayoz, Apr 18 '11 at 14:06
Some advice since it looks like you're coming over from the Java world: in iOS exceptions are rarely used for program control. An exception almost always means that the programmer did something wrong and it should be fixed. http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/ErrorHandlingCocoa/CreateCustomizeNSError/CreateCustomizeNSError.html#//apple_ref/doc/uid/TP40001806-CH204-BAJIIGCC — kubi, Apr 18 '11 at 14:13
Here's a better link that describes the role of exceptions in Cocoa/iOS: http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/ErrorHandlingCocoa/CreateCustomizeNSError/CreateCustomizeNSError.html#//apple_ref/doc/uid/TP40001806-CH204-BAJIIGCC — kubi, Apr 18 '11 at 14:20

score 92 · Accepted Answer · answered Apr 18 '11 at 14:06

92

@try {
    // Try something
}
@catch (NSException * e) {
    NSLog(@"Exception: %@", e); 
}
@finally {
    // Added to show finally works as well
}

answered Apr 18 '11 at 14:06

Neil Knight

4

Curious: is there EVER a situation where the exception caught would not be of type `NSException`? More importantly, is there ever a situation in which the `NSLog` could blow up? If you think this is a different question, let me know and I'll ask it properly. – Dan Rosenstark Jan 12 '12 at 19:12
Yes, you can capture a specific exception or a custom exception. Check out the example under "Catching Different Types of Exception". http://developer.apple.com/library/ios/#documentation/cocoa/conceptual/objectivec/Chapters/ocExceptionHandling.html – IanStallings Nov 29 '12 at 04:41

1 Answers1