兩段**，首先是使用方法
01cgcontextref context = uigraphicsgetcurrentcontext();
02nsarray *colors = [nsarray arraywithobjects:
03[uicolor colorwithred:225.0 / 255.0 green:225.0 / 255.0 blue:225.0 / 255.0 alpha:1.0],
04[uicolor colorwithred:168.0 / 255.0 green:168.0 / 255.0 blue:168.0 / 255.0 alpha:1.0],
05nil];
06[self _drawgradientcolor:context
07rect:cgrectmake(rx, ry, rw, rh)
08options:kcggradientdrawsafterendlocation
09colors:colors];
10cgcontextstrokepath(context);// 描線,即繪製形狀
11cgcontextfillpath(context);// 填充形狀內的顏色
在一段就是繪製背景色漸變的矩形
01/**
02* 繪製背景色漸變的矩形，p_colors漸變顏色設定，集合中儲存uicolor物件（建立color時一定用三原色來建立）
03**/
04- (void)_drawgradientcolor:(cgcontextref)p_context
05rect:(cgrect)p_cliprect
06options:(cggradientdrawingoptions)p_options
07colors:(nsarray *)p_colors
21}
22cggradientref gradient = cggradientcreatewithcolorcomponents(rgb, colorcomponents, null, colorcount);
23cgcolorspacerelease(rgb);
24cgpoint startpoint = p_cliprect.origin;
25cgpoint endpoint = cgpointmake(cgrectgetminx(p_cliprect), cgrectgetmaxy(p_cliprect));
26cgcontextdrawlineargradient(p_context, gradient, startpoint, endpoint, p_options);
27cggradientrelease(gradient);
28cgcontextrestoregstate(p_context);// 恢復到之前的context
29}
還有一種實現方式
1cagradientlayer *gradient = [cagradientlayer layer];
2gradient.frame = cgrectmake(rx, ry, rw, rh);
3gradient.colors = [nsarray arraywithobjects:
4(id)[uicolor blackcolor].cgcolor,
5(id)[uicolor graycolor].cgcolor,
6(id)[uicolor blackcolor].cgcolor,
7nil];
8[self.view.layer insertsublayer:gradient atindex:0];
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