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我想在 iOS 中使用具有以下概念的图像编辑应用程序创建一个应用程序。当我单击图像上的一个位置时，相关位置应该缩放，如果我在它上面画一个圆圈，它会在关闭缩放位置时保存到确切位置

. 当我单击图像时，我使用 CAShapelayer 做了一些事情，将通过以下代码以编程方式绘制一个圆圈

. 现在工作，当我点击图像时会完美地画一个圆圈

. 但我想，当我点击图像时，它会创建一个小圆圈图像视图并填充点击的图像药水（缩放图像）

. 当我单击该缩放图像视图时，它需要创建一个圆圈并关闭缩放视图，并且该圆圈需要显示在普通图像上

. 有图书馆吗？我希望有人会帮助做到这一点。

  (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
    {
        UITouch *touch = [touches anyObject];
        CGPoint touch_point = [touch locationInView:self.view];

        if ([imgVw pointInside:touch_point withEvent:event])
        {
            NSLog(@"point inside imageview");

            CGPoint point = [touch locationInView:self.view];
            NSLog(@"X location: %f", point.x);
            NSLog(@"Y Location: %f",point.y);



            CAShapeLayer *circleLayer = [CAShapeLayer layer];
            // Give the layer the same bounds as your image view
            [circleLayer setBounds:CGRectMake(0.0f, 0.0f, [imgVw bounds].size.width,
                                              [imgVw bounds].size.height)];
            // Position the circle anywhere you like, but this will center it
            // In the parent layer, which will be your image view's root layer
            [circleLayer setPosition:CGPointMake([imgVw bounds].size.width/2.0f,
                                                 [imgVw bounds].size.height/2.0f)];






            // Create a circle path.
            UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:
                                  CGRectMake(point.x, point.y, 10.0f, 10.0f)];
            // Set the path on the layer
            [circleLayer setPath:[path CGPath]];
            // Set the stroke color
            [circleLayer setStrokeColor:[[UIColor redColor] CGColor]];
            // Set the stroke line width
            [circleLayer setLineWidth:2.0f];

            [layerArray addObject:circleLayer];         // will push all layer in to array it will help to re edit like undo operation
            [[imgVw layer] addSublayer:circleLayer];    //will add a circle on image

        }
 }
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