UIImage 마스크(스텐실) 효과 주기 - Core Graphics

iOS/Skills 2010. 7. 21. 19:47

원본: http://iphonedevelopertips.com/general/remove-shine-gloss-effect-on-iphone-icon.html
출처: http://www.devpia.com/MAEUL/Contents/Detail.aspx?BoardID=7462&MAEULNO=911&no=51777&page=1

How to Mask an Image

Posted on December 9, 2008 by Rodney Aiglstorfer in Cocoa

Masking an image enables a developer to create images with irregular shapes dynamically. Masking is often used to create a user interface that is more compelling and less boring.

Take for example the following example …

Creating the mask above is really simple using CoreGraphics on the iPhone. The following is a function that takes two images and uses one to mask the other.

- (UIImage*) maskImage:(UIImage *)image withMask:(UIImage *)maskImage {
 
	CGImageRef maskRef = maskImage.CGImage; 
 
	CGImageRef mask = CGImageMaskCreate(CGImageGetWidth(maskRef),
		CGImageGetHeight(maskRef),
		CGImageGetBitsPerComponent(maskRef),
		CGImageGetBitsPerPixel(maskRef),
		CGImageGetBytesPerRow(maskRef),
		CGImageGetDataProvider(maskRef), NULL, false);
 
	CGImageRef masked = CGImageCreateWithMask([image CGImage], mask);
	return [UIImage imageWithCGImage:masked];
 
}

Yep … its just that simple!

NOTE: The mask image cannot have ANY transparency. Instead, transparent areas must be white or some value between black and white. The more towards black a pixel is the less transparent it becomes.

저작자표시

'iOS > Skills' 카테고리의 다른 글

UIBarButtonSystemItem 추가된 아이템 (0)	2010.07.21
UIAlertView 커스터마이징 (0)	2010.07.21
UINavigationBar 커스터마이징 (0)	2010.07.21
App Icon에 뱃지(Badge) 달기 (0)	2010.07.21
앱 아이콘 반사효과 없애기 (0)	2010.07.21