Using a compound statement enclosed in parentheses to enclose scope of a local UIView that's added to your view controller's view hierarchy and held as a weak reference. In response to http://ashfurrow.com/blog/weakstrong-dance

gistfile1.m

#import "ViewController.h"

@interface ViewController ()

@property (nonatomic, weak) UILabel *label;

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    // For more information on GNU C's statement expressions (and conveniently, Clang's
    // statement expressions, too), see http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html
    // and http://cocoa-dom.tumblr.com/post/56517731293/new-thing-i-do-in-code

    // `label`, being the last expression, becomes the value of the entire
    // statement expression, that is, the value of everything between ({}) to
    // outsiders. So, you could *kind of* think about it like you're passing the
    // return value of some anonymous function to -[UIView addSubview:].
    [self.view addSubview:({
        UILabel *label = [UILabel new];
        label.text = @"Hello world";
        label.frame = (CGRect) { .origin.x = 20, .origin.y = 100 };
        [label sizeToFit];
        self.label = label;
    })];

    // Alternatively, if you don't like the GNU C extension nature of statement
    // expressions, you could create an anonymous block and immediately evaluate
    // it.
    [self.view addSubview:^id{
        UILabel *label = [UILabel new];
        label.text = @"Hello world";
        label.frame = (CGRect) { .origin.x = 20, .origin.y = 100 };
        [label sizeToFit];
        self.label = label;
        return self.label;
    }()];

    // `label` is not polluting the local scope of -viewDidLoad, and
    // `self.label` is a weak reference.

    // In response to http://ashfurrow.com/blog/weakstrong-dance
}

@end