stretch a Image like android nine-patch?

Question

UIImage Method :

- (UIImage *)stretchableImageWithLeftCapWidth:(NSInteger)leftCapWidth topCapHeight:(NSInteger)topCapHeight.

Here the stretchable area is forced to be a single pixel high/wide.

I can not set the stretchable area, so I want to know: is there a UIImage category to do that?

After I googled, I found a lib.

Question: Is there a nine-patch loader for iPhone?

Announcement: http://blog.tortuga22.com/2010/05/31/announcing-tortuga-22-ninepatch/

This is a source pic, and I want to stretch the inside gray rect.

Thanks in advance.

Answer 1

One way to achieve this is using the below approach,

UIImage * backgroundImg = [UIImage imageNamed:@"bg.png"];

backgroundImg = [backgroundImg resizableImageWithCapInsets:UIEdgeInsetsMake(2,2, 2, 2)];

[imgView setImage: backgroundImg];

UIEdgeInsetsMake(2,2, 2, 2) is the amount of pixels you want unstretchable.

Answer 2

You can achieve nine patch with Tortuga22 software

You can find source from this GitHub here

Use it like this

[btnSubmit setImage: [TUNinePatchCache imageOfSize:[btnSubmit bounds].size 
                                forNinePatchNamed:@"imgNormalBackground"]
                       forControlState:UIControlStateNormal];