CODEWITHSUNDEEP
iphoneios5objective-c-2.0
user1275979
user1275979

Reputation: 11

How do we know if a class/interface has a delegate? --iOS

I am newb. Every one is talking about delegates.Yes, It is powerful but always I ask my self a question : "How do we know any class in ios SDK has a delegate?" which gives more functionality. For example, we use UITextField/UIAlertview several times and it took me some time to know that it has a delegate and gives some more functionality. I knew this,what if I don`t know that it has a delegate and limit my self to use Alertview functionality without knowing its delegate methods. Any one can please through some light on it ? how do I know any xxxclass has a delegate? Thanks in advance!

Upvotes: 0

Views: 193

Answers (5)

sch
sch

Reputation: 27506

Alt-click on the class name in your code and you will see some documentation.

enter image description here

Then you can click on the link to the class reference or on the book icon to get the reference of the class.

So whenever you have a doubt about a class, your first reflex should be to have a look at the documentation.

Upvotes: 1

Vignesh
Vignesh

Reputation: 10251

Whenever you use a API class, see the header file. It has all the information you need regarding the API. Suppose if you want to know more about UITextfield look at UITextfield.h.

Upvotes: 1

grahamparks
grahamparks

Reputation: 16296

Apple's documentation is generally very good at explaining this kind of thing.

If you hold the option (alt) key and click on the class name in your code, XCode will pop up a mini documentation widget, and you can click on the Reference link to get to the full documentation page for that class. The Overview section will cover what delegates, notifications etc are available.

Upvotes: 1

Jamie
Jamie

Reputation: 5112

If you weren't sure, you can look in the class reference file. If the class has a delegate property, you can be sure you can be the delegate of the class. For example.

http://developer.apple.com/library/ios/#documentation/uikit/reference/UITextField_Class/Reference/UITextField.html

Hope this helps.

Upvotes: 1

Novarg
Novarg

Reputation: 7450

Declare a variable and then see if it has a delegate property or a setDelegate: method. Example:

UITextField *testTextField = [[UITextField alloc]init];
testTextField.delegate = self;

If it doesn't have a delegate it will give you an error.

Hope it helps

Upvotes: 0

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