I read some code, I founded the @protocol have defined a @property's protocol.
For example
protocol1.h
@protocol protocol2;
@protocol protocol1
-(void)p1_method1;
-(void)p1_method2;
@property (readonly, nonatomic) id<protocol2>p2;
@end
protocol2.h
@protocol protocol2
-(void)p2_method1;
-(void)p2_method2;
@end
I don't know the protocol have a @property protocol mean. Have a simple example? Thanks.
All you need to do is @synthesize p2 in a class that conforms to protocol1. Properties from protocols don't get automatically synthesised.
@interface Class1 : NSObject <protocol1>
@end
@implementation Class1
@synthesize p2; // Synthesize p2, the property from protocol1
- (void)p1_method1 {
// Do something
}
- (void)p1_method2 {
// Do something else
}
This will create the correct getter/setter for the property (in your example the property is readonly so only a getter). The @synthesize will also create the ivar, in this case p2.
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