如果项目中经常需要使用该方法时可以新建一个UIimage的分类,并将方法封装到其分类中.

绘制方法的封装:

//绘制指定颜色图片+ (UIImage *)createImageWithColor:(UIColor *)color RectSize:(CGSize)rectSize                                                CornerRadius:(float)cornerRadius{     //直接绘制图像方法//    CGRect rect=CGRectMake(0.0f, 0.0f, 50.0f, 50.0f);//    UIGraphicsBeginImageContext(rect.size);//    CGContextRef context = UIGraphicsGetCurrentContext();//    CGContextSetFillColorWithColor(context, [color CGColor]);//    CGContextFillRect(context, rect);//    UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();//    UIGraphicsEndImageContext();        //带圆角图像的绘制方法    UIImage *theImage;    CGRect rect = CGRectMake(0.0f, 0.0f, rectSize.width, rectSize.height);        UIGraphicsBeginImageContext(rect.size);   //开始画线    [theImage drawInRect:CGRectMake(0, 0, rect.size.width, rect.size.height)];    //获取上下文    CGContextRef context = UIGraphicsGetCurrentContext();    //边框大小    CGContextSetLineWidth(context, 1);    //边框颜色    CGContextSetStrokeColorWithColor(context, COLORS_CLEAR.CGColor);    //矩形填充颜色    CGContextSetFillColorWithColor(context, [color CGColor]);    /*     *     将要绘制的图像大小,分割成8个点,每两个点可以可以确定一条射线,每两条射线相交处可以设置圆弧.     当前方法中先绘制的右下角,     例如,将要绘制的圆角图片大小为:宽100,高100 圆角5,则需要的点分别为:     A(100,10)     B(100,100)     C(90,100)     D(0,100)     E(0,90)     F(0,0)     G(10,0)     H(100,0)     *    */        //绘制图像及圆角    CGContextMoveToPoint(context, rectSize.width, cornerRadius * 2);  // 开始坐标右边开始    CGContextAddArcToPoint(context, rectSize.width, rectSize.height, rectSize.width - 10, rectSize.height, cornerRadius);  // 右下角    CGContextAddArcToPoint(context, 0, rectSize.height, 0, rectSize.height - 10, cornerRadius); // 左下角    CGContextAddArcToPoint(context, 0, 0, cornerRadius * 2, 0, cornerRadius); // 左上角    CGContextAddArcToPoint(context, rectSize.width, 0, rectSize.width, cornerRadius * 2, cornerRadius); // 右上角    CGContextDrawPath(context, kCGPathFillStroke); //根据当前坐标绘制路径    theImage = UIGraphicsGetImageFromCurrentImageContext();//获取绘图        //拉伸当前图像    CGFloat h = theImage.size.height * 0.5;    CGFloat w = theImage.size.width * 0.5;    UIImage *rsizeImg = [theImage resizableImageWithCapInsets:UIEdgeInsetsMake(h, w, h, w) resizingMode:UIImageResizingModeStretch];        return rsizeImg;}

使用时方法:

UIButton *testBtn = [[UIButton alloc]initWithFrame:CGRectMake(0,0, 85, 40)];[testBtn setImage:[UIImage createImageWithColor:[UIColor grarColor] RectSize:testBtn.size CornerRadius:5] forState:UIControlStateNormal];[testBtn setImage:[UIImage createImageWithColor:[UIColor yellowColor] RectSize:testBtn.size CornerRadius:5] forState:UIControlStateHighlighted]

在实际使用时的效果: