Skip to main content

Posts

Showing posts with the label arc

iOS ARC - weak and strong properties

I'm trying to understand the way ARC works, and as far as I know, I should be doing something wrong here. This is the code I'm using: Interface: @interface ViewController : UIViewController{ } @property (strong, nonatomic) NSString * myString ; @property (weak, nonatomic) NSString * myPointer ; Implementation: - (void)viewDidLoad{ [super viewDidLoad]; self.myString = @"Hello world!" ; // myString is strong self.myPointer = self.myString ; // myPointer var is weak [self performSelector:@selector(makeNilMyValue) withObject:nil afterDelay:1]; [self performSelector:@selector(printValues) withObject:nil afterDelay:2]; } - (void) makeNilMyValue{ self.myString = nil ; } - (void) printValues{ NSLog(@"myString: %@", self.myString) ; NSLog(@"myPointer: %@", self.myPointer) ; } After executing this, I get: 2012-02-26 11:40:41.652 test1[933:207] myString: (null) 2012-02-26 11:40:41.653 test1[933:207] myP