Objective-C: Assertion vs. Exception vs. Error

Question

In Cocoa, when should I use NSAssert, NSException, NSError?

Here\'s what I\'ve been thinking:

NSAssert - When creating any client program us

Answer 1

Edit: In Xcode 4.2, assertions are turned off by default for release builds,

Now NSAssert will not be compiled into your code in a release build, but you can change it in build settings

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@Mike Weller, There are one wrong in your answer.

One thing to note is that NSAssert will not be compiled into your code in a release build, so this is typically used for sanity checking during development.

Actually, NSAssert will be compiled into your code if you don't add NS_BLOCK_ASSERTIONS in your precompiled prefix files.

In Technical Note TN2190 we can find:

Macros like NDEBUG to turn off C assert or NS_BLOCK_ASSERTIONS to turn off Foundation's NSAssert are important to specify for your precompiled prefix files

Or you can read this one:How to know if NSAssert is disabled in release builds?