有時候需要為uiview新增虛線描邊，本文記錄一種實現方式，主要是通過對uiview的根layer新增cashapelayer來完成。效果圖如下:
cgsize screensize = [uiscreen mainscreen].bounds.size;
cgfloat viewwidth = 200;cgfloat viewheight = 200;
uiview *view = [[uiview alloc] initwithframe:cgrectmake((screensize.width - viewwidth)/2, (screensize.height - viewheight) / 2, viewwidth, viewheight)];
view.backgroundcolor = [uicolor colorwithwhite:0.9 alpha:1];
view.layer.cornerradius = cgrectgetwidth(view.bounds)/2;
cashapelayer *borderlayer = [cashapelayer layer];
borderlayer.bounds = cgrectmake(0, 0, viewwidth, viewheight);
borderlayer.position = cgpointmake(cgrectgetmidx(view.bounds), cgrectgetmidy(view.bounds));//
borderlayer.path = [uibezierpath bezierpathwithrect:borderlayer.bounds].cgpath;
borderlayer.path = [uibezierpath bezierpathwithroundedrect:borderlayer.bounds cornerradius:cgrectgetwidth(borderlayer.bounds)/2].cgpath;borderlayer.linewidth = 1. / [[uiscreen mainscreen] scale];
//虛線邊框borderlayer.linedashpattern = @[@8, @8];
//實線邊框// borderlayer.linedashpattern = nil;
borderlayer.fillcolor = [uicolor clearcolor].cgcolor;
borderlayer.strokecolor = [uicolor redcolor].cgcolor;
[view.layer addsublayer:borderlayer];
[self.view addsubview:view];
置為nil
即可。
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