-(UIImage*)imageWithBorderW:(CGFloat)borderW borderColor:(UIColor*)color image:(UIImage*)image{

//1.開(kāi)啟一個(gè)和原始圖片一樣大小的位圖上下文.

CGSizesize =CGSizeMake(image.size.width+2*borderW, image.size.height+2* borderW);

UIGraphicsBeginImageContextWithOptions(size,NO,0);

//2.繪制一個(gè)大圓,填充

UIBezierPath*path = [UIBezierPathbezierPathWithOvalInRect:CGRectMake(0,0, size.width, size.height)];

[BGCOLORset];

[pathfill];

//3.添加一個(gè)裁剪區(qū)域.

path = [UIBezierPathbezierPathWithOvalInRect:CGRectMake(borderW, borderW, image.size.width, image.size.height)];

[pathaddClip];

//4.把圖片繪制到裁剪區(qū)域當(dāng)中.

[imagedrawAtPoint:CGPointMake(borderW, borderW)];

//5.生成一張新圖片.

UIImage*clipImage =UIGraphicsGetImageFromCurrentImageContext();

//6.關(guān)閉上下文.

UIGraphicsEndImageContext();

returnclipImage;

}

然后self調(diào)用即可.效果如下圖