CODEWITHSUNDEEP
objective-c
futureelite7
futureelite7

Reputation: 11502

How do I test which class an object is in Objective-C?

How do I test whether an object is an instance of a particular class in Objective-C? Let's say I want to see if object a is an instance of class b, or class c, how do I go about doing it?

Upvotes: 212

Views: 149836

Answers (6)

Saranjith
Saranjith

Reputation: 11547

You can also check run time. Put one breakpoint in code and inside (lldb) console write

(lldb) po [yourObject class]

Like this..

enter image description here

Upvotes: 0

Vladimir
Vladimir

Reputation: 170809

To test if object is an instance of class a:

[yourObject isKindOfClass:[a class]]
// Returns a Boolean value that indicates whether the receiver is an instance of 
// given class or an instance of any class that inherits from that class.

or

[yourObject isMemberOfClass:[a class]]
// Returns a Boolean value that indicates whether the receiver is an instance of a 
// given class.

To get object's class name you can use NSStringFromClass function:

NSString *className = NSStringFromClass([yourObject class]);

or c-function from objective-c runtime api:

#import <objc/runtime.h>

/* ... */

const char* className = class_getName([yourObject class]);
NSLog(@"yourObject is a: %s", className);

EDIT: In Swift

if touch.view is UIPickerView {
    // touch.view is of type UIPickerView
}

Upvotes: 350

Kuldeep Tanwar
Kuldeep Tanwar

Reputation: 3526

if you want to get the name of the class simply call:-

id yourObject= [AnotherClass returningObject];

NSString *className=[yourObject className];

NSLog(@"Class name is : %@",className);

Upvotes: 1

Inder Kumar Rathore
Inder Kumar Rathore

Reputation: 39978

If you want to check for a specific class then you can use

if([MyClass class] == [myClassObj class]) {
//your object is instance of MyClass
}

Upvotes: 2

Duke
Duke

Reputation: 61

What means about isKindOfClass in Apple Documentation

Be careful when using this method on objects represented by a class cluster. Because of the nature of class clusters, the object you get back may not always be the type you expected. If you call a method that returns a class cluster, the exact type returned by the method is the best indicator of what you can do with that object. For example, if a method returns a pointer to an NSArray object, you should not use this method to see if the array is mutable, as shown in the following code:

// DO NOT DO THIS!
if ([myArray isKindOfClass:[NSMutableArray class]])
{
    // Modify the object
}

If you use such constructs in your code, you might think it is alright to modify an object that in reality should not be modified. Doing so might then create problems for other code that expected the object to remain unchanged.

Upvotes: 3

Clement M
Clement M

Reputation: 779

You also can use 

NSString *className = [[myObject class] description];

on any NSObject

Upvotes: 22

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