Re: [iPhone] Black background behind UIView??
Re: [iPhone] Black background behind UIView??
- Subject: Re: [iPhone] Black background behind UIView??
- From: PCWiz <email@hidden>
- Date: Sun, 14 Feb 2010 12:26:26 -0700
That did the trick, thanks :)
Independent Cocoa Developer, Macatomy Software
http://macatomy.com
On 2010-02-14, at 12:22 AM, David Duncan wrote:
> On Feb 13, 2010, at 9:45 PM, PCWiz wrote:
>
>> I have a really simple UIView subclass, all it contains is this:
>>
>> - (void)drawRect:(CGRect)rect
>> {
>> CGContextRef ctx = UIGraphicsGetCurrentContext();
>> CGContextSetRGBFillColor(ctx, 1.0f, 1.0f, 1.0f, 1.0f);
>> CGContextFillEllipseInRect(ctx, CGRectMake(10.0f, 10.0f, 100.0f, 100.0f));
>> }
>>
>> It should draw a white circle. To use it, I'm programatically creating the view using UIView initWithFrame: then adding it as a subview in my UIViewController's viewDidLoad method. The problem is that a black square appears behind the circle. I don't know if this is due to the fact that there are several CALayers under the view. Any suggestions?
>
>
> By default views are opaque, and the backing store for the view is likely filled with zeros (this is not guaranteed, but common) so the view's backing store is interpreted as a white circle on a black background.
>
> If you set opaque=NO, then you may get white on a clear background, but you can only guarantee such behavior if you set backgroundColor=[UIColor clearColor];
> --
> David Duncan
> Apple DTS Animation and Printing
>
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