@Property attributes

properties.m

#import <Foundation/Foundation.h>
#import <objc/runtime.h>

@interface MyClass : NSObject

@property(assign)            NSString *strAssign;
@property(retain)            NSString *strRetain;
@property(copy)              NSString *strCopy;
@property(weak)              NSString *strWeak;
@property(strong)            NSString *strStrong;
@property(unsafe_unretained) NSString *strUnsafe;
@end

@implementation MyClass
@synthesize strAssign, strRetain, strCopy, strWeak, strStrong, strUnsafe;
@end

int main (int argc, const char * argv[])
{
    @autoreleasepool
    {
        const char *props[] =
        {
            "strAssign",
            "strUnsafe",
            "strWeak",
            "strRetain",
            "strStrong",
            "strCopy",
            NULL
        };
        
        const char **ptr = props;
        
        while(*ptr != NULL)
        {
            objc_property_t prop = class_getProperty([MyClass class], *ptr);
            
            NSLog(@"%-9s: %s", *ptr, property_getAttributes(prop));
            
            ptr++;
        }
    }
    return 0;
}

// The weak property attribute is, according to Apple documentation, reported by the letter W
/* Expected output:
 
 strAssign: T@"NSString",VstrAssign
 strUnsafe: T@"NSString",VstrUnsafe
 strWeak  : T@"NSString",W,VstrWeak
 strRetain: T@"NSString",&,VstrRetain
 strStrong: T@"NSString",&,VstrStrong
 strCopy  : T@"NSString",C,VstrCopy
 */

/* Actual output:
 
 strAssign: T@"NSString",VstrAssign
 strUnsafe: T@"NSString",VstrUnsafe
 strWeak  : T@"NSString",VstrWeak
 strRetain: T@"NSString",&,VstrRetain
 strStrong: T@"NSString",&,VstrStrong
 strCopy  : T@"NSString",C,VstrCopy
 */