如何移动/动画CGRects

Question

I'm having trouble moving CGRects around. I'm trying to make a breakout game. In my drawView file, I have written code in the drawRect function by removing the comments. I end my drawRect function with this moveBall(&_ball, &_context, rect);

moveball() is declared/implemented in my viewController.h/viewController.m.

I'm not sure how to then move/animate the ball once it is in my controller. I have the following code:

void moveBall(CGRect *ball, CGContextRef *context, CGRect rect) 
{
    CGFloat velX = 1;
    CGFloat velY = 1;

    while (ball->origin.x + CGRectGetWidth(*ball) < CGRectGetWidth(rect))
    {
        CGContextClearRect(*context, *ball);
        *ball = CGRectOffset(*ball, velX, velY);
        CGContextFillEllipseInRect(*context, *ball);
    }
};

What happens is that the ball is "moved" to a different place, not animated there. The problem is that the while loop is implemented and the final result is displayed. I want the while loop to run after the drawing is done.

Can anyone guide me to make the ball move?

Answer 1

Trying to make animations inside the drawRect method using CoreGraphics framework is exercise in futility.

For animations you should use other frameworks/technologies intended for that.

• Standard apps - Core Animation
• Games - SpriteKit, OpenGL ES, Metal, cocos2D, Unity3D,