ARC + Blocks examination

gistfile1.m

# MyObject.h
@interface MyObject : NSObject
 
@property (nonatomic, copy) void (^block)();
@property (nonatomic, copy) NSString *str;
 
- (void)performBlock;
 
@end
 
# MyObject.m
@implementation MyObject
 
- (void)performBlock
{
    if (self.block) {
        self.block();
    }
}
 
@end
 
# Test
MyObject *object = [[MyObject alloc] init];
object.str = @"hoge";
 
object.block = ^{
    NSLog(@"block: str=%@", object.str);
};
 
[object performBlock];