Test ARC whether it retains self on method execution or not

ViewController.m

@interface MyObject : NSObject
@end

@implementation MyObject

- (void)doSomething {
    for (int i = 0; i < 1000; i++) {
        [self print:i];
        usleep(100);
    }
}

- (void)print:(int)i {
    NSLog(@">>> %d", i);
}

- (void)dealloc {
    NSLog(@"DEALLOC");
}

@end


@interface ViewController ()

@property (nonatomic) MyObject *sut;

@end

@implementation ViewController

- (instancetype)initWithCoder:(NSCoder *)aDecoder {
    self = [super initWithCoder:aDecoder];
    if (self) {
        _sut = [MyObject new];
    }
    return self;
}

- (void)viewDidLoad {
    [super viewDidLoad];

    // start executing long running task in the background
    dispatch_async(dispatch_get_global_queue(QOS_CLASS_BACKGROUND, 0), ^{
        [self.sut doSomething];
    });
}

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];

    // set property to nil in a bit
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        NSLog(@"SET PROPERTY TO NIL");
        self.sut = nil;
    });
}

@end