In Objective-C, you can check if a class has a particular method using the respondsToSelector: method. This method is typically used to check if a class or object can respond to a particular message or method call.
Here's a quick example:
// Let's say we have a class called "MyClass"
@interface MyClass : NSObject
- (void)myMethod;
@end
// We can check if the class "MyClass" has the method "myMethod" like this:
if ([MyClass respondsToSelector:@selector(myMethod)]) {
NSLog(@"MyClass has the method myMethod");
} else {
NSLog(@"MyClass does not have the method myMethod");
}
In this example, we're using the respondsToSelector: method to check if the MyClass class responds to the myMethod selector. If the class does have the method, we'll log out that it does. If not, we'll log out that it doesn't.
You can also use the respondsToSelector: method on an instance of a class to check if that particular object has a certain method implemented:
// Let's say we have an instance of "MyClass" called "myInstance"
MyClass *myInstance = [[MyClass alloc] init];
// We can check if "myInstance" has the method "myMethod" like this:
if ([myInstance respondsToSelector:@selector(myMethod)]) {
NSLog(@"myInstance has the method myMethod");
} else {
NSLog(@"myInstance does not have the method myMethod");
}
This will give us the same output as before, but now we're checking if the specific instance of the MyClass class has the myMethod method implemented.