Setting up a view to draw to in Objective-C (iPhone) ?

Posted by Johannes Jensen on Stack Overflow See other posts from Stack Overflow or by Johannes Jensen
Published on 2010-03-31T23:18:09Z Indexed on 2010/03/31 23:23 UTC
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Okay, so, I'm all new to iPhone and stuff, but I'm not even at programming, I have many years of experience with ActionScript 2.0 and 3.0, I want to set up a view, that I can also pass variables to. The view is gonna draw everything with Quartz.

I tried to make another game where I tried to add a pointer to a NSMutableArray to the view class, but it didn't work cause I didn't know how to store an actual class.

I wanted to do like:

[myView setNeedsDisplay];

but I had to do

[(View*)self.view setNeedsDisplay];

didn't really work out in the end...

Okay, so now I got:

- (void) viewDidLoad {
    [super viewDidLoad];
 viewClass = [[View class] retain];
 gameView = [[[viewClass alloc] initWithFrame: CGRectZero] retain];
 [gameView setNeedsDisplay];
}

This is in my drawInContext:context, which is fired by drawRect:

Also, my drawRect does [self drawInContext: UIGraphicsGetCurrentContext()];

CGContextSetStrokeColorWithColor(context, [[UIColor blackColor] CGColor]);
CGContextSetLineWidth(context, 3.0);
CGContextSetLineCap(context, kCGLineCapRound);
CGContextSetLineJoin(context, kCGLineJoinRound);
CGMutablePathRef aPath = CGPathCreateMutable();
CGPathMoveToPoint(aPath, nil, 5, 5);
CGPathAddLineToPoint(aPath, nil, 45, 43);
CGContextAddPath(context, aPath);
CGContextStrokePath(context);

Nothing happens.

Help?

Oh yeah, I get this error: : invalid context for each time I use those functions. :[

Thanks!

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