iOS Help Creating a UIImageView

[xcodeNewbie]

I'm making a game in which the user controls a ship and has to shoot at other ships that fly by. When the user presses the button that says "shoot", the method "shoot" gets called, creating a UIImageView for the shot.

-(IBAction)shoot {
    UIImageView *shot = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"shot.jpg"]];
    [shot setBounds:CGRectMake(0, 0, 30, 30)];
}

I set the image to the top right corner of the screen for testing purposes. However, when I run the program and press "shoot", nothing happens. What am I doing wrong?

 

[robbieduncan]

You have not added the view as a subview of an existing visible view. So it is never drawn as it is not part of the on-screen view hierarchy.

 

[pulsewidth947]

-(IBAction)shoot {
    UIImageView *shot = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"shot.jpg"]];
    [shot setBounds:CGRectMake(0, 0, 30, 30)];
    [window addSubview:shot]; // syntax may be wrong there.. but along the right lines
    [shot release] // dont forget - if you alloc, you are responsible for releasing.
}

Also - if you haven't already seen it, start lurking on stack overflow.

 

[xcodeNewbie]

Another UIImageView question

This is sort of an add on to a previous question...I create a UIImageView programmatically in the code below.

-(IBAction)shoot {
    UIImageView *shot = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"shot.jpg"]];
    [shot setBounds:CGRectMake(ship.center.x-15,ship.center.y-15,25,25)];
    [superView addSubview:shot];
    [shot release];    
}

I'm trying to make it so the shot appears right above my ship, so it appears the ship is shooting. However, no matter how I change the CGRetMake, the shot will always appear in the upper left part of the screen. I even once set the starting coordinates to 99999999999 just to see what would happen. It still appeared in the top left corner of the screen.

 

[robbieduncan]

Read, and understand, the View Programming Guide. In particular pay attention to the difference between a views frame and it's bounds.