How to define and implement properties in protocol

Question

I want to define one protocol with few properties and need to use those properties in another NSObject subclass. Please give me link or example code. I need that to work wit

Answer 1

@property just says to the compiler that the class is expected to define the methods to match that property.

@protocol MyProtocol
@property (nonatomic, readonly) id someObject;
@property (nonatomic, getter=isAlive) BOOL alive;
@end

Anything implementing that protocol will now need to have

- (id)someObject;
- (BOOL)isAlive;
- (void)setAlive:(BOOL)aBOOL;

Answer 2

I think the things you're dealing with are primarily side effects of the introduction of Objective-C 2.0. It lets you do things like declare properties without also defining instance vars. But (as you have discovered), it is only x86_64 and post-10.5 compatible.