Using a variable in a statement to reference the image stored in a UIImageView

Answer 1

Ugh! Your line in question:

((UIImageView *) (Tst)).image = sampleimage;

is casting a string pointer as a UIImageView pointer - you're basically saying that your pointer to a string is actually a pointer to a UIImageView! It will compile (because the compiler will accept your assertion happily) but will of course crash on running.

You need to declare a variable of type UIImageView. This can then hold whichever view you want to set the image of. So your code could look like the following:

NSString *TmpImage = @"0.png";
UIImageView *myImageView;

If (someCondition == YES) {
    myImageView = si1_1_2;  //Assuming this is the name of your UIImageView
} else {
    myImageView = si1_1_3;  //etc
}

UIImage *sampleimage = [UIImage imageNamed:TmpImage];  //no need to retain it
myImageView.image = sampleImage;

Hopefully this makes sense!

Edit: I should add, why are you trying to have multiple UIImageViews? Because a UIImageView's image can be changed at any time (and in fact can hold many), would it not be better to have merely one UIImageView and just change the image in it?