Why it does not draw circle ? (iPhone)

A:

Please read the documentation on Quartz 2D library that will let you draw the basic shapes and more.

Ram 2009-08-03 06:06:31

Thanks, but why it does't draw in my case ?

Lukas Šalkauskas 2009-08-03 06:08:17

You might have to get the correct Device GraphicsContext and draw to that graphics context, there are few of them available

Ram 2009-08-03 06:16:00

Brad is right, you need to override drawRect method and call setNeedsDisplay when you need the view to repaint itself

Ram 2009-08-03 07:32:42

+6 A:

All custom drawing for a UIView needs to be done within its -drawRect: method. You'll need to subclass UIView, move everything from line 41 through 50 into that method in the subclass, and create a boolean property on that subclass which controls whether or not the circle gets drawn. Within your controller code above, you'll need to set the new property to YES and call -setNeedsDisplay on your UIView to trigger a redraw of the view, leading to your circle being displayed.

Alternatively, you could create a UIView subclass that always draws the circle, and just add and remove it from your controller's main view as needed.

Brad Larson 2009-08-03 06:54:58

Thanks, I will try to do that.

Lukas Šalkauskas 2009-08-03 07:55:55

Still can't make it... :S I'm totaly new to this kind of development idiology, also i'm new to objective-c. Maybe you could give me some example code. I could send mine code to you if you'll give me your contacts.

Lukas Šalkauskas 2009-08-03 17:32:42

A:

Hmm I can't understand how to do that...

Maybe anyone can explain (In very detailed way) me every step by step strating with creation of new project ?

Lukas Šalkauskas 2009-08-03 21:14:31

A:

Try watching the two part lecture series to see how to draw to a UIView:

http://www.myiphoneadventure.com/?p=98

statikfx 2009-11-22 17:54:00

ansaurus

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Why it does not draw circle ? (iPhone)

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