ios 在 UIScrollView 中关闭缩放

Turn off Zooming in UIScrollView

提问by CodingWithoutComments

Does anyone know a way to temporarily turn off zooming when using a UIScrollView?

有谁知道在使用 UIScrollView 时暂时关闭缩放的方法？

I see that you can disable scrolling using the following:

我看到您可以使用以下方法禁用滚动：

self.scrollView.scrollEnabled = false;

but I'm not seeing a similar command for zooming. Any thoughts?

但我没有看到类似的缩放命令。有什么想法吗？

回答by combinatorial

If you want to disable the user's ability to zoom through gestures then in iOS 5 and above you can disable the pinch gesture. This still allows you to control the scroll view from code...

如果您想禁用用户缩放手势的能力，那么在 iOS 5 及更高版本中，您可以禁用捏合手势。这仍然允许您从代码控制滚动视图...

scrollView.pinchGestureRecognizer.enabled = NO;

similarly for pan...

同样对于锅...

scrollView.panGestureRecognizer.enabled = NO;

This must be called in - (void)viewDidAppear:(BOOL)animatedor later as otherwise the system resets it to enabled.

这必须被调用- (void)viewDidAppear:(BOOL)animated或稍后调用，否则系统会将其重置为启用。

Swift 4.x and above:

Swift 4.x 及更高版本：

imageZoomView.pinchGestureRecognizer?.isEnabled= false/ true

imageZoomView.pinchGestureRecognizer?.isEnabled=假/真

回答by CodingWithoutComments

Following fbrereto's advice above, I created two functions lockZoom and unlockZoom. When locking Zoom i copied my max and min zoom scales to variables then set the max and min zoom scale to 1.0. Unlocking zoom just reverses the process.

按照上面 fbrereto 的建议，我创建了两个函数 lockZoom 和 unlockZoom。锁定缩放时，我将最大和最小缩放比例复制到变量，然后将最大和最小缩放比例设置为 1.0。解锁缩放只是颠倒了这个过程。

-(void)lockZoom
{
    maximumZoomScale = self.scrollView.maximumZoomScale;
    minimumZoomScale = self.scrollView.minimumZoomScale;

    self.scrollView.maximumZoomScale = 1.0;
    self.scrollView.minimumZoomScale = 1.0;
}

-(void)unlockZoom
{

    self.scrollView.maximumZoomScale = maximumZoomScale;
    self.scrollView.minimumZoomScale = minimumZoomScale;

}

回答by derand

Also you can return "nil" as zooming view in UIScrollViewDelegate:

您也可以在 UIScrollViewDelegate 中返回“nil”作为缩放视图：

- (UIView *) viewForZoomingInScrollView:(UIScrollView *) scrollView
{
    return canZoom?view:nil;
}

回答by fbrereto

Check setting minimumZoomScaleand maximumZoomScale; According to the docs:

检查设置minimumZoomScale和maximumZoomScale；根据文档：

maximumZoomScalemust be greater than minimumZoomScalefor zooming to be enabled.

maximumZoomScale必须大于minimumZoomScale才能启用缩放。

So, setting the values to be the same should disable zooming.

因此，将值设置为相同应该禁用缩放。

回答by yohannes

I have tried setting minimumZoomScaleand maximumZoomScaleproperties of UIScrollViewto 1or isMultipleTouchEnabledproperty of UIViewto falseor return nilfrom viewForZooming(in:)of UIScrollViewDelegatebut none worked. In my case, after several trial and error, the following works in my case [Tested on iOS 10.3]:

我试过设置minimumZoomScale和maximumZoomScale属性UIScrollViewto1或isMultipleTouchEnabled属性UIViewtofalse或 return nilfrom viewForZooming(in:)ofUIScrollViewDelegate但没有奏效。就我而言，经过多次反复试验，以下在我的情况下有效[在 iOS 10.3 上测试]：

class MyViewController: UIViewController {
   var webView: WKWebView?

   override viewDidLoad() {
      super.viewDidLoad()

      //...
      self.webView.scrollView.delegate = self
      //...
   }
}

extension MyViewController: UIScrollViewDelegate { 
   func scrollViewWillBeginZooming(_ scrollView: UIScrollView, with view: UIView?) {
      scrollView.pinchGestureRecognizer?.isEnabled = false
   }
}

回答by iChirag

here, my solution for stop zooming on scrollview.

在这里，我停止缩放滚动视图的解决方案。

self.scrollView.minimumZoomScale=self.scrollView.maximumZoomScale;

回答by Paul.s

I know this is a really old question but I made a slight variation for my purposes.

我知道这是一个非常古老的问题，但为了我的目的，我做了一些改动。

I wanted to be able to easily tell if the zooming was in fact enabled/disabled without relying on a comparison between scrollView.minimumZoomScale == scrollView.maximumZoomScale, which could possibly not reflect whether zooming was actually enabled/disabled.

我希望能够在不依赖于 之间的比较的情况下轻松判断缩放是否实际上已启用/禁用scrollView.minimumZoomScale == scrollView.maximumZoomScale，这可能无法反映缩放是否实际启用/禁用。

So I did this

所以我做了这个

// .h
@property (assign, nonatomic, getter=isZoomEnabled) BOOL zoomEnabled;

// .m
@synthesize zoomEnabled = _zoomEnabled;

- (void)setZoomEnabled:(BOOL)zoomEnabled;
{
  _zoomEnabled = zoomEnabled;

  UIScrollView *scrollView = self.scrollView;

  if (zoomEnabled) {
    scrollView.minimumZoomScale = self.minimumZoomScale;
    scrollView.maximumZoomScale = self.maximumZoomScale;
  } else {
    scrollView.minimumZoomScale = 0.0f;
    scrollView.maximumZoomScale = 0.0f;
  }
}

The values for self.minimumZoomScaleand self.maximumZoomScaleare set at the time the UIScrollViewis configured.

对值self.minimumZoomScale和self.maximumZoomScale被设置在所述的时间UIScrollView配置。

This gives me the ability to set/ask if zooming is enabled.

这使我能够设置/询问是否启用缩放。

myViewController.zoomEnabled = YES;
myViewController.isZoomEnabled;

回答by Ahmad F

Swift 3 Version:

斯威夫特 3 版本：

func lockScrollViewZooming() {
    scrollView.minimumZoomScale = 1.0
    scrollView.maximumZoomScale = 1.0
    scrollView.bounces = false
    scrollView.bouncesZoom = false

    // Also, if you have double tap recognizer,
    // remember to remove it
    scrollView.removeGestureRecognizer(doubleTapGestureRecognizer)
}

func unlockScrollViewZooming() {
    scrollView.minimumZoomScale = 1.0
    scrollView.maximumZoomScale = 4.0
    scrollView.bounces = true
    scrollView.bouncesZoom = true

    // Also, if you have double tap recognizer,
    // remember to add it
    scrollView.removeGestureRecognizer(doubleTapGestureRecognizer)
}

Note that doubleTapGestureRecognizershould be an instance variable. It should be similar to:

注意doubleTapGestureRecognizer应该是一个实例变量。它应该类似于：

private lazy var doubleTapGestureRecognizer: UITapGestureRecognizer = {
    let doubleTapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(handleDoubleTap(_:)))
    doubleTapGestureRecognizer.numberOfTapsRequired = 2
    doubleTapGestureRecognizer.delegate = self

    return doubleTapGestureRecognizer
}()

@objc private func handleDoubleTap(_ recognizer: UITapGestureRecognizer) {
    //scrollView.setZoomScale((scrollView.zoomScale > scrollView.minimumZoomScale) ? scrollView.minimumZoomScale : scrollView.maximumZoomScale, animated: true)

    if scrollView.zoomScale > scrollView.minimumZoomScale {
        scrollView.setZoomScale(scrollView.minimumZoomScale, animated: true)
    } else {
        let touchLocation = recognizer.location(in: recognizer.view)
        scrollView.zoom(to: CGRect(origin: touchLocation, size: CGSize(width: 22.0, height: 20.0)), animated: true)
    }
}

回答by mmtootmm

If you want to disable only zooming with pinch gesture, below code does the trick.

如果您只想禁用捏合手势缩放，下面的代码可以解决问题。

scrollView.pinchGestureRecognizer?.requireGestureRecognizerToFail(scrollView.panGestureRecognizer)