How to animate the drawing of UIImages inside a
drawRect: method of a UIView?
in the drawRect: method of one of my app's UIViews, I'm drawing a grid
of images, one per grid point. The code below works great except, of
course, that it ignores the animating argument. I would like to
animate the drawing by drawing what appears to the user as one image
at a time, with a short time delay between images. (Of course, I'm
*always* drawing one image at a time with the code below, but you know
what I mean).
Now, it's not clear to me how to accomplish the animation. If these
were UIImageViews instead of images, I could animate their frame
properties using the beginAnimations:context: and commitAnimations
class methods of UIView. Is that the way to go? If so, won't that be
expensive and slow, considering that I'll be laying out about 100
subviews? (there are 2 "interlocked" grids of 49 images each). If
that's not the way to go, then how do I animate the drawing?
Thanks in advance.
- (void) drawGridInRect: (CGRect) rect Animating: (BOOL) animating
CGFloat xmin = rect.origin.x;
CGFloat ymin = rect.origin.y;
for (int i = 0; i < kGridSize; ++i)
CGFloat x = xmin + i * deltaX;
for (int j = 0; j < kGridSize; ++j)
CGFloat y = ymin + j * deltaY;
UIImage* imageObj = ...; // the image is provided by an
CGFloat wo2 = imageObj.size.width / 2.0;
CGFloat ho2 = imageObj.size.height / 2.0;
[imageObj drawAtPoint: CGPointMake(x - wo2, y - ho2)];
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