CODEWITHSUNDEEP
iphoneobjective-c
Duck
Duck

Reputation: 35953

iphone: try end try

Is there in objective-C any way to see if it is possible to do a certain task without risking crash the application?

Other languages like javascript have 

try
  {
  //Run some code here
  }
catch(err)
  {
  //Handle errors here
  }

is there something in Objective-C? If so, what is the syntax?

thanks.

Upvotes: 0

Views: 2401

Answers (3)

bbum
bbum

Reputation: 162712

While Felix's answer is technically correct, it isn't the whole story.

On the iOS and Mac OS X, exceptions are used to indicate non-recoverable program errors. Exceptions are not used to indicate user error or recoverable errors like on Java.

Any exception that passes through system framework code will leave said framework in an undefined state.. Catching said exceptions and trying to recover from it will lead to memory leaks, undefined behaviour and crashing.

Upvotes: 17

Kendall Helmstetter Gelner
Kendall Helmstetter Gelner

Reputation: 75058

The real question is, what are you trying to do in that error catching block?

There are different ways to hook into different kinds of errors. What kind of code specifically are you looking to wrap in a block like that?

Upvotes: 0

Felix Kling
Felix Kling

Reputation: 816422

Have a look at Exception Handling :

Cup *cup = [[Cup alloc] init];

@try {
    [cup fill];
}
@catch (NSException *exception) {
    NSLog(@"main: Caught %@: %@", [exception name], [exception reason]);
}
@finally {
    [cup release];
}

Also worth to have a look: Error Handling Programming Guide

Upvotes: 4

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