Objective-C: message syntax vs. dot syntax; what's the difference?

问题:

If I'm using @synthesize foo;, what's the difference between the following:

// message syntax [myObj setFoo:5]; [myObj foo];

and

// dot syntax myObj.foo = 5; myObj.foo;

I like the consistency of the dot syntax but I don't know if it's doing something I should be I concerned about.

Any additional information would be a great help.

回答1:

There is no functional difference between using dot syntax and using message syntax.

I find that using message syntax is more consistent with the language as a whole and that dot syntax was just implemented as a convenience to programmers who were coming over from languages that used it (Java comes to mind).

All I ask is: Whichever one you choose, be consistent with it. Do not mix and match single property setters! (Multiple-argument setters are obviously exempt).

回答2:

They are the same.

The dot syntax is used to signify the access of @property's which you can also acces via:

[myObject setValue: [NSNumber numberWithIntValue:5] forKey:@"foo"]; [myObject valueForKey:@"foo"];

But in essence the calls are the same.

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