CODEWITHSUNDEEP
objective-cmacoscocoansview
Sentos
Sentos

Reputation: 35

How to specify which NSView to draw on in objective-c?

I found this example of drawing a rectangle in objective-c cocoa

NSRect r = NSMakeRect(10, 10, 50, 60);
NSBezierPath *bp = [NSBezierPath bezierPathWithRect:r];
NSColor *color = [NSColor blueColor];
[color set];
[bp stroke];

However, where should I specify which NSView to draw on in the code?

For example, if I have two NSView objects, and I run this code, how do I specify which one to draw on?

Upvotes: 3

Views: 868

Answers (2)

Andrew Madsen
Andrew Madsen

Reputation: 21383

You don't run this code on an NSView, rather it runs in an NSView subclass's override of the -drawRect: method.

You'll need to create your own subclass of NSView, then in that subclass, override -drawRect: and put this code there:

@interface CustomView : NSView
@end

@implementation CustomView

- (void)drawRect:(NSRect)dirtyRect
{
    NSRect r = NSMakeRect(10, 10, 50, 60);
    NSBezierPath *bp = [NSBezierPath bezierPathWithRect:r];
    NSColor *color = [NSColor blueColor];
    [color set];
    [bp stroke];
}

@end

Finally, you will of course have to instantiate an instance of CustomView and add it to your view hierarchy, just as you would normally do with a regular NSView.

Upvotes: 4

Phillip Mills
Phillip Mills

Reputation: 31026

Subclass NSView, add your code to the drawRect: method of the subclass, and replace the appropriate NSView with an instance of your class.

Upvotes: 1

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