Delegates: Difference between revisions
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Typos |
Example of delegate that does not implement "thing" |
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* Implement "thing" and return the string "delegate implementaion" |
* Implement "thing" and return the string "delegate implementaion" |
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Show how objets are created and used. First, without a delegate, then with a delegate. |
Show how objets are created and used. First, without a delegate, then with a delegate that does not implement 'thing', and last with a delegate that implement "thing". |
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==[[Objective-C]]== |
==[[Objective-C]]== |
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int main() |
int main() |
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{ |
{ |
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// Without a delegate |
// Without a delegate: |
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Delegator *a = [[Delegator alloc] init]; |
Delegator *a = [[Delegator alloc] init]; |
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assert([[a operation] isEqualToString:@"default implementation"]); |
assert([[a operation] isEqualToString:@"default implementation"]); |
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// With a delegate |
// With a delegate that does not implement thing: |
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[a setDelegate:@"A delegate may be any object"]; |
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assert([isEqualToString:@"delegate implementation"]); |
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// With a delegate that implement "thing": |
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Delegate *d = [[Delegate alloc] init]; |
Delegate *d = [[Delegate alloc] init]; |
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[a setDelegate:d]; |
[a setDelegate:d]; |
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assert a.operation() == 'default implementation' |
assert a.operation() == 'default implementation' |
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# With delegate |
# With a delegate that does not implement "thing" |
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a.delegate = 'A delegate may be any object' |
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assert a.operation() == 'default implementation' |
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# With delegate that implement "thing" |
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a.delegate = Delegate() |
a.delegate = Delegate() |
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assert a.operation() == 'delegate implementation' |
assert a.operation() == 'delegate implementation' |
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