How a class extension works as a means of implementing private methods
I believe a popular way to declare "private methods" in Objective-C is to create its class extension and declare methods that you would like to make as private.
I would like to know more in detail on how an class extension makes the methods work as private.
- Update: I asked this question with the term empty category which is incorrect. I now ch开发者_Python百科anged it as class extension
That's not an "empty category", it's a class extension. Read Bbum's explanation of them at the link I provided.
That's because you create your empty category in your implementation file, not your header file so other classes can't access it.
//TestClass.h
@interface TestClass : NSObject
{
}
-(void)publicMethod;
@end
//TestClass.m
@interface TestClass()
-(void)privateMethod;
@end
@implementation TestClass
-(void)publicMethod
{
NSLog (@"public");
}
-(void)privateMethod
{
NSLog (@"private");
}
@end
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