**：
- (uiimage *)stretchableimagewithleftcapwidth:(nsinteger)leftcapwidth topcapheight:(nsinteger)topcapheight
- (uiimage *)resizableimagewithcapinsets:(uiedgeinsets)capinsets
//保持四周一定區域畫素不拉伸，將影象擴散到一定的大小
- (nsimage *)stretchableimagewithsize:(nssize)size edgeinsets:(nsedgeinsets)insets;
//保持leftwidth,rightwidth這左右一定區域不拉伸，將寬度拉伸到(leftwidth+middlewidth+rightwidth)
- (nsimage *)stretchableimagewithleftcapwidth:(float)leftwidth middlewidth:(float)middlewidth rightcapwidth:(float)rightwidth;
詳細**如下：
/**
* //保持四周一定區域畫素不拉伸，將影象擴散到一定的大小
*/- (nsimage *)stretchableimagewithsize:(nssize)size edgeinsets:(nsedgeinsets)insets
;
nsrect rect = nsmakerect(0, 0, size.width, size.height);
// source rects
nsrect srcrect = (nsrect);
nsrect srctopl, srctopc, srctopr, srcmidl, srcmidc, srcmidr, srcbotl, srcbotc, srcbotr;
makeareas(srcrect, &srctopl, &srctopc, &srctopr, &srcmidl, &srcmidc, &srcmidr, &srcbotl, &srcbotc, &srcbotr);
// destinations rects
nsrect dsttopl, dsttopc, dsttopr, dstmidl, dstmidc, dstmidr, dstbotl, dstbotc, dstbotr;
makeareas(rect, &dsttopl, &dsttopc, &dsttopr, &dstmidl, &dstmidc, &dstmidr, &dstbotl, &dstbotc, &dstbotr);
nsrect srcrects = ;
nsrect dstrects = ;
nsmutablearray *partimgs = [nsmutablearray arraywithcapacity:9];
for (int i=0;i<9;i++)
// draw
nsimage *resultimg = [[nsimage alloc] initwithsize:rect.size];
[resultimg lockfocus];
nsdrawninepartimage(rect,
[partimgs objectatindex:0],
[partimgs objectatindex:1],
[partimgs objectatindex:2],
[partimgs objectatindex:3],
[partimgs objectatindex:4],
[partimgs objectatindex:5],
[partimgs objectatindex:6],
[partimgs objectatindex:7],
[partimgs objectatindex:8],
nscompositesourceover, 1, no);
[resultimg unlockfocus];
return resultimg;
}/**
* //保持leftwidth,rightwidth這左右一定區域不拉伸，將寬度拉伸到(leftwidth+middlewidth+rightwidth)
*/- (nsimage *)stretchableimagewithleftcapwidth:(float)leftwidth middlewidth:(float)middlewidth rightcapwidth:(float)rightwidth
// generate the middle image
nsrect rectmiddle = nsmakerect(0, 0, middlewidth, imageheight);
nsimage *imagemiddle = [[nsimage alloc] initwithsize:rectmiddle.size];
if (imagemiddle.size.width > 0)
// generate the right image
nsrect rectright = nsmakerect(0, 0, rightwidth, imageheight);
nsimage *imageright = [[nsimage alloc] initwithsize:rectright.size];
if (imageright.size.width > 0)
// combine the images
nsimage *newimage = [[nsimage alloc] initwithsize:nsmakesize(imagewidth, imageheight)];
if (newimage.size.width > 0)
// release the images and return the new image
return newimage;
}
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