iOS-UIImage图片绘制颜色

- (uiimage *)dtk_setimagecolor:(uicolor *)imagecolor{
    //获取画布
    uigraphicsbeginimagecontextwithoptions(self.size, no, 0.0f);
    //画笔沾取颜色
    [imagecolor setfill];
    cgrect bounds = cgrectmake(0, 0, self.size.width, self.size.height);
    //绘制一次
    uirectfill(bounds);
    //再绘制一次
    [self drawinrect:bounds blendmode:kcgblendmodeoverlay alpha:1.0f];
    //获取图片
    [self drawinrect:bounds blendmode:kcgblendmodedestinationin alpha:1.0f];
    uiimage *image = uigraphicsgetimagefromcurrentimagecontext();
    uigraphicsendimagecontext();
    return image;
}