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ios 开发之ios视频截屏的实现代码
现在好多视频截屏软件，这里提供一个ios 视频截屏的方法，大家可以参考下，
实现代码：
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//截屏
static int i=0;
-(ibaction)screenshot:(id)sender{
uigraphicsbeginimagecontextwithoptions(cgsizemake(640, 960), yes, 0);
[[self.window layer] renderincontext:uigraphicsgetcurrentcontext()];
uiimage *viewimage = uigraphicsgetimagefromcurrentimagecontext();
uigraphicsendimagecontext();
cgimageref imageref = viewimage.cgimage;
cgrect rect =cgrectmake(166, 211, 426, 320);//这里可以设置想要截图的区域
cgimageref imagerefrect =cgimagecreatewithimageinrect(imageref, rect);
uiimage *sendimage = [[uiimage alloc] initwithcgimage:imagerefrect];
uiimagewritetosavedphotosalbum(sendimage, nil, nil, nil);//保存图片到照片库
nsdata *imageviewdata = uiimagepngrepresentation(sendimage);
nsarray *paths = nssearchpathfordirectoriesindomains(nsdocumentdirectory, nsuserdomainmask, yes);
nsstring *documentsdirectory = [paths objectatindex:0];
nsstring *picturename= [nsstring stringwithformat:@"screenshow_%d.png",i];
nsstring *savedimagepath = [documentsdirectory stringbyappendingpathcomponent:picturename];
nslog(@"%@", savedimagepath);
[imageviewdata writetofile:savedimagepath atomically:yes];//保存照片到沙盒目录
cgimagerelease(imagerefrect);
i++;
}
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