我有UIWebView，在其scrollView中，我添加了一个像这样的UIImageView：
self.webview.scrollView.addSubview(image)
我的问题是当我将设备从纵向旋转到横向时，UIImageView没有停留在我最初在scrollView上设置的位置，我理解屏幕的宽度和高度变化，我猜我想要的是什么它会改变我的UIImageView上的位置，所以看起来它没有改变。
我有这个方法：
override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {
var newScrollViewFrame = webview.scrollView.frame
var newFrame = webview.frame
newFrame.size.width = size.width
newFrame.size.height = size.height
newScrollViewFrame.size.width = size.width
newScrollViewFrame.size.height = size.height
webview.frame = newFrame
webview.scrollView.frame = newScrollViewFrame
}
此方法中的当前代码只调整UIWebView及其滚动视图的大小，但不调整scrollView中的UIImageViews
任何帮助都将不胜感激。
谢谢，
我尝试了以下内容：
for views in webview.scrollView.subviews
{
if(views.isKindOfClass(UIImageView))
{
views.transform = CGAffineTransformMakeRotation(CGFloat(M_PI)/2);
}
}
但这会在旋转时侧向放置UIImageView
以下是我如何将webview添加到视图中：
webview = UIWebView()
webview.frame = self.view.bounds
webview.scrollView.frame = webview.frame
webview.userInteractionEnabled = true
webview.scalesPageToFit = true
webview.becomeFirstResponder()
webview.delegate = self
webview.scrollView.delegate = self
self.view.addSubview(webview)
我有一半解决了我的问题，但做了以下事情：
webview.translatesAutoresizingMaskIntoConstraints = false
let horizontalConstraint = NSLayoutConstraint(item: webview, attribute: NSLayoutAttribute.CenterX, relatedBy: NSLayoutRelation.Equal, toItem: view, attribute: NSLayoutAttribute.CenterX, multiplier: 1, constant: 0)
view.addConstraint(horizontalConstraint)
let verticalConstraint = NSLayoutConstraint(item: webview, attribute: NSLayoutAttribute.CenterY, relatedBy: NSLayoutRelation.Equal, toItem: view, attribute: NSLayoutAttribute.CenterY, multiplier: 1, constant: 0)
view.addConstraint(verticalConstraint)
let widthConstraint = NSLayoutConstraint(item: webview, attribute: NSLayoutAttribute.Width, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 0.1, constant: 500)
view.addConstraint(widthConstraint)
let heightConstraint = NSLayoutConstraint(item: webview, attribute: NSLayoutAttribute.Height, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1, constant: 500)
view.addConstraint(heightConstraint)
但是现在，UIWebView不是全宽或高度:( Sooooo close。
我也试过这个，但是UIImageView不会保留在同一个地方。
let left = NSLayoutConstraint(item: self.webView, attribute: .Left, relatedBy: .Equal, toItem: self.view, attribute: .Left, multiplier: 1, constant: 0)
let right = NSLayoutConstraint(item: self.webView, attribute: .Right, relatedBy: .Equal, toItem: self.view, attribute: .Right, multiplier: 1, constant: 0)
let top = NSLayoutConstraint(item: self.webView, attribute: .Top, relatedBy: .Equal, toItem: self.view, attribute: .Top, multiplier: 1, constant: 0)
let bottom = NSLayoutConstraint(item: self.webView, attribute: .Bottom, relatedBy: .Equal, toItem: self.view, attribute: .Bottom, multiplier: 1, constant: 0)
NSLayoutConstraint.activateConstraints([top, bottom, left, right])
我也尝试过向UIImageView添加约束
let stampView:StampAnnotation = StampAnnotation(imageIcon: UIImage(named: "approved.png"), location: CGPointMake(currentPoint.x, currentPoint.y))
self.webview.scrollView.addSubview(stampView)
let left = NSLayoutConstraint(item: stampView, attribute: .Left, relatedBy: .Equal, toItem: self.webview.scrollView, attribute: .Left, multiplier: 1, constant: 0)
let right = NSLayoutConstraint(item: stampView, attribute: .Right, relatedBy: .Equal, toItem: self.webview.scrollView, attribute: .Right, multiplier: 1, constant: 0)
let top = NSLayoutConstraint(item: stampView, attribute: .Top, relatedBy: .Equal, toItem: self.webview.scrollView, attribute: .Top, multiplier: 1, constant: 0)
let bottom = NSLayoutConstraint(item: stampView, attribute: .Bottom, relatedBy: .Equal, toItem: self.webview.scrollView, attribute: .Bottom, multiplier: 1, constant: 0)
NSLayoutConstraint.activateConstraints([top, bottom, left, right])
同样的结果，UIImageView不会停留在同一个地方。
更新
我的网页浏览：
webview = UIWebView()
webview.userInteractionEnabled = true
webview.scalesPageToFit = true
webview.becomeFirstResponder()
webview.delegate = self
webview.scrollView.delegate = self
self.view.addSubview(webview)
webview.loadRequest(NSURLRequest(URL:url))
webview.gestureRecognizers = [pinchRecognizer, panRecognizer]
webview.translatesAutoresizingMaskIntoConstraints = false
let left = NSLayoutConstraint(item: webview, attribute: .Left, relatedBy: .Equal, toItem: self.view, attribute: .Left, multiplier: 1, constant: 0)
let right = NSLayoutConstraint(item: webview, attribute: .Right, relatedBy: .Equal, toItem: self.view, attribute: .Right, multiplier: 1, constant: 0)
let top = NSLayoutConstraint(item: webview, attribute: .Top, relatedBy: .Equal, toItem: self.view, attribute: .Top, multiplier: 1, constant: 0)
let bottom = NSLayoutConstraint(item: webview, attribute: .Bottom, relatedBy: .Equal, toItem: self.view, attribute: .Bottom, multiplier: 1, constant: 0)
NSLayoutConstraint.activateConstraints([top, bottom, left, right])
的UIImageView
stampView.translatesAutoresizingMaskIntoConstraints = false
let left = NSLayoutConstraint(item: stampView, attribute: .Left, relatedBy: .Equal, toItem: self.webview.scrollView, attribute: .Left, multiplier: 1, constant: 100)
let right = NSLayoutConstraint(item: stampView, attribute: .Right, relatedBy: .Equal, toItem: self.webview.scrollView, attribute: .Right, multiplier: 1, constant: 0)
let top = NSLayoutConstraint(item: stampView, attribute: .Top, relatedBy: .Equal, toItem: self.webview.scrollView, attribute: .Top, multiplier: 1, constant: 100)
let bottom = NSLayoutConstraint(item: stampView, attribute: .Bottom, relatedBy: .Equal, toItem: self.webview.scrollView, attribute: .Bottom, multiplier: 1, constant: 0)
let width = NSLayoutConstraint(item: stampView, attribute: NSLayoutAttribute.Width, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 0.1, constant: 150)
let height = NSLayoutConstraint(item: stampView, attribute: NSLayoutAttribute.Height, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1, constant: 73)
NSLayoutConstraint.activateConstraints([left, right, top, bottom, width, height])
我只需要弄清楚数学让这个设备处于触摸位置。 （百分比？）
答案 0 :(得分：2)
我认为如果不使用自动布局，这些事情总是更容易做到。为此，我建议使用viewDidLayoutSubviews（）。这是我的代码：
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
webView.frame = view.bounds
let screen = UIScreen.mainScreen().fixedCoordinateSpace
//These values will give a rect half the size of the screen and centered.
let width = screen.bounds.width / 2
let height = screen.bounds.height / 2
let x = (screen.bounds.width - width) / 2
let y = (screen.bounds.height - height) / 2
let absoluteRect = CGRect(x: x, y: y, width: width, height: height)
let stampRect = screen.convertRect(absoluteRect, toCoordinateSpace: webView)
stampView.frame = stampRect
//Change the orientation of the image
switch UIDevice.currentDevice().orientation {
case .LandscapeLeft:
stampView.image = UIImage(CGImage:originalImage.CGImage!, scale:originalImage.scale, orientation: UIImageOrientation.Left)
break
case .LandscapeRight:
stampView.image = UIImage(CGImage:originalImage.CGImage!, scale:originalImage.scale, orientation: UIImageOrientation.Right)
break
default:
stampView.image = UIImage(CGImage:originalImage.CGImage!, scale:originalImage.scale, orientation: UIImageOrientation.Up)
break
}
}
我在这里做了几件事......首先我设置了webViewFrame。接下来，在此处定义相对于屏幕的绝对坐标系统很有帮助。当手机方向改变时，屏幕的值不会改变（允许你将imageView保持在同一个地方。）接下来我为stampView定义了所需的帧，然后将绝对帧转换为其在scrollView中的等效帧（它＆＃ 39; s superView）并将其分配给stampView。最后，如果您希望StampView中的图像始终正确定向，则需要更改图像方向。 CGAffineTransformMakeRotation仅在视图为方形时才有效，但我们可以通过实际更改stampView中的imageOrientation来使其更加通用。这需要原始图片的属性：
let originalImage = UIImage(named: "image_name")!
最后，因为viewWillLayoutSubViews（）没有为横向过渡调用，请执行以下操作：
override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {
view.setNeedsLayout()
}
此代码不适用于最漂亮的过渡，它应该有助于解决您的布局问题。
答案 1 :(得分：1)
要使UIImageView保持相同的尺寸并保持与UIWebView相同的位置，您可以将观看次数设置为各自的{ {1}}。在这里，我创建了一些模拟视图来说明基本思想：
superView然后在旋转时更改框架（注意import UIKit
class ViewController: UIViewController {
//we create some views for testing and create references to the size and points we need for positioning
let webView = UIWebView()
let image = UIImageView()
let image2 = UIImageView()
var imageViewSize = CGSize()
var imageViewCenter = CGPoint()
override func viewDidLoad() {
super.viewDidLoad()
//set webView frame
webView.frame = self.view.bounds
webView.backgroundColor = UIColor.clearColor()
webView.userInteractionEnabled = true
webView.scalesPageToFit = true
webView.opaque = false
self.view.addSubview(webView)
//we will hold onto the original size of the UIImageView for later
imageViewSize = CGSizeMake(webView.bounds.size.width * 0.2, webView.bounds.size.height * 0.1)
//mock UIImageView
image.backgroundColor = UIColor.orangeColor()
image.frame.size = CGSizeMake(imageViewSize.width, imageViewSize.height)
image.center = CGPointMake(webView.bounds.size.width / 2, webView.bounds.size.height / 2)
webView.scrollView.addSubview(image)
//I've created a subset image to illustrate the orientation
image2.backgroundColor = UIColor.whiteColor()
image2.frame = CGRectMake(10, 10, 10, 10)
image.addSubview(image2)
}
上的位置和UIImageView的宽度是相对于{{1}的高度设置的s，反之亦然，因为设备已旋转）：
UIWebView由于您要将视图的位置和大小创建为superView的百分比，因此代码将使用不同的设备大小（即iPhone / iPad）播放更好。