在缩放时保持UIButton相对 [英] Keeping UIButton relative when zooming

问题描述

我有一个带有UIImageview的UIScrollview，里面显示了平面图。我在scrollview中也有一个UIButton作为标记/引脚。

I have a UIScrollview with a UIImageview inside it showing a floor plan. I also have a UIButton within the scrollview that acts as a marker/pin.

我已经实现了对图像进行捏合/双击的缩放，但是UIButton元素显然没有当图像滚动和/或缩放时移动。

I have implemented zooming with pinching/double tapping on the image, but the UIButton element obviously doesn't move when the image scrolls and/or zooms.

我已尝试以下代码尝试在缩放完成时重新定位按钮：

I have tried the following code to try and resposition the button when a zoom is completed:

[myButton setFrame:CGRectMake(
                          (myButton.frame.origin.x - myButton.frame.size.width / 2) * _scrollView.zoomScale,
                          (myButton.frame.origin.y - myButton.frame.size.height / 2) * _scrollView.zoomScale,
                          myButton.frame.size.width, myButton.frame.size.height)];

这会将按钮移动到左上角。

This moves the button to the top left hand corner.

有没有人知道我应该做些什么来保持按钮相对于图像（就像标记在谷歌地图上的做法一样）。

Has anyone got any idea of what I should be doing to keep the button relative to the image (the same way a marker does on a Google map).

推荐答案

好的，这可以通过以下方式解决：

Ok well this was solved by the following:

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
[button setBackgroundImage:[UIImage imageNamed:@"Marker.png"] forState:UIControlStateNormal];
button.frame = CGRectMake(640.0, 230.0, 30.0, 46.0);
[button addTarget:self action:@selector(aMethod:)forControlEvents:UIControlEventTouchUpInside];
[self.imageView addSubview: button];
self.imageView.userInteractionEnabled = YES;

基本上通过直接添加按钮到imageView然后启用userInteraction，我就可以获得所有需要的功能。

Basically by adding the button to the imageView directly and then enabling userInteraction, I was able to get all the functionality needed.

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