Question

I’m trying to recall an image that I load in (void)viewDidLoad in another block, (void)moveObject. However, because I’m dealing with two different blocks, I apparently can’t recall the image. Is there some way I should rearrange the code to be able to make it work?

- (void)viewDidLoad {
    CGRect myImageRect = CGRectMake(200.0f, 350.0f, 52.0f, 100.0f);
    UIImageView *myImage = [[UIImageView alloc] initWithFrame:myImageRect];
    [myImage setImage:[UIImage imageNamed:@"flake.png"]];
    myImage.opaque = YES;
    [self.view addSubview:myImage];

    moveObjectTimer = [NSTimer scheduledTimerWithTimeInterval:0.001 target:self selector:@selector(moveObject) userInfo:nil repeats:YES];
}

-(void) moveObject { 
    myImage.center = CGPointMake(myImage.center.x, myImage.center.y +1);
}

Answer 1

Create an instance variable for myImage, or a property if you’d like getters and setters as well.

Here’s how with just an instance variable:

.m

@implementation MyClass {

    UIImageView *_myImage;

}

- (void)viewDidLoad
{
    CGRect myImageRect = CGRectMake(200.0f, 350.0f, 52.0f, 100.0f);
    UIImageView *myImage = [[UIImageView alloc] initWithFrame:myImageRect];
    [myImage setImage:[UIImage imageNamed:@"flake.png"]];
    myImage.opaque = YES;
    [self.view addSubview:myImage];
    _myImage = myImage;
}

-(void) moveObject { 
    _myImage.center = CGPointMake(_myImage.center.x, _myImage.center.y +1);