MAC Day 11 : objective-c : try catch

1. catch

@try {

...

}

@catch (CustomException *ce) { // 1

...

}

@catch (NSException *ne) { // 2

// Perform processing necessary at this level.

...

}

@catch (id ue) {

...

}

@finally { // 3

// Perform processing necessary whether an exception occurred or not.

...

}

2. throw

SException *exception = [NSException exceptionWithName: @"HotTeaException"

reason: @"The tea is too hot"

userInfo: nil];

@throw exception;

ref: http://developer.apple.com/library/ios/#documentation/cocoa/conceptual/objectivec/Chapters/ocExceptionHandling.html