UIColor `-colorWithPatternImage:` alpha blending problem solution. (iOS SDK 4.1)

Question

Solution note, not a question.

I used this code to set background as a pattern image:

UIImage *bg     =   SomeImage();
UIColor *bgc    =   [UIColor colorWithPatternImage:bg];
[self setBackgroundColor:bgc];
[self setOpaque:NO];

This works, but alpha blending doesn't work. Might be a bug. How to make it work?

Platform: iOS SDK 4.1

Ahh, you genius! I'm so glad you posted this Eonil. Saved me hours of head scratching and eye gouging. Might be worth mentioning: to access and modify layer properties one'll need to import ``. — David Foster, Oct 17 '10 at 11:31

score 12 · Accepted Answer · answered Mar 18 '11 at 05:16

12

This code make it alpha blended on both of simulator and device.

UIImage *bg     =   SomeImage();
UIColor *bgc    =   [UIColor colorWithPatternImage:bg];
[self setBackgroundColor:bgc];
[self setOpaque:NO];
[[self layer] setOpaque:NO];      // Added this line.

answered Mar 18 '11 at 05:16

eonil

83,476
81
317
516

1

I did not have to set the layer opaque. It worked fine without it. – Palimondo Jul 21 '11 at 14:14
@Palimondo So, I can assume it has been patched. Thanks! – eonil Jul 22 '11 at 04:40

UIColor `-colorWithPatternImage:` alpha blending problem solution. (iOS SDK 4.1)

Solution note, not a question.

1 Answers1