uiscrollview 相关问题

如何禁用 UIScrollView 到平移手势识别器？

当平移手势识别器（我们称之为 SomePanGestureRecognizer）被调用时，如何禁用或强制失败 UIScrollView 中的手势识别器？ gestureRecognizer(_:

拦截 UIScrollView 上的平移手势会中断滚动

我有一个垂直滚动的 UIScrollView。我还想在其上处理水平平移，同时允许默认的垂直滚动行为。我在滚动视图上放置了一个透明的 UIView，并且...

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我无法修复这个复杂视图中的滚动视图约束

我的代码有约束问题。我看到以下类型的错误： 将尝试通过打破约束来恢复 我的代码中存在约束问题。我看到以下类型的错误： 会尝试通过打破约束来恢复 在 UIViewAlertForUnsatisfiableConstraints 处创建一个符号断点以在调试器中捕获它。 中列出的 UIView 的 UIConstraintBasedLayoutDebugging 类别中的方法也可能有帮助。 我认为限制是问题所在。 我遇到的另一个问题是按钮视图中的按钮。它们有一点偏移，有时当 numN 改变时它不适合屏幕。 import UIKit import Foundation class PianoRollView: UIView { var numN = 127 var numT = 4 override func draw(_ rect: CGRect) { super.draw(rect) // Draw the grid let context = UIGraphicsGetCurrentContext() context?.setStrokeColor(UIColor.black.cgColor) context?.setLineWidth(1.0) let noteHeight = rect.height / CGFloat(numN) for i in 1..<numN { let y = CGFloat(i) * noteHeight context?.move(to: CGPoint(x: 0, y: y)) context?.addLine(to: CGPoint(x: rect.width, y: y)) } let timeSlotWidth = rect.width / CGFloat(numT) for i in 1..<numT { let x = CGFloat(i) * timeSlotWidth context?.move(to: CGPoint(x: x, y: 0)) context?.addLine(to: CGPoint(x: x, y: rect.height)) } // Add line to right of grid context?.move(to: CGPoint(x: rect.width, y: 0)) context?.addLine(to: CGPoint(x: rect.width, y: rect.height)) // Add line to left of grid context?.move(to: CGPoint(x: 0, y: 0)) context?.addLine(to: CGPoint(x: 0, y: rect.height)) // Add line to top of grid context?.move(to: CGPoint(x: 0, y: 0)) context?.addLine(to: CGPoint(x: rect.width, y: 0)) // Draw bottom line context?.move(to: CGPoint(x: 0, y: rect.height)) context?.addLine(to: CGPoint(x: rect.width, y: rect.height)) context?.strokePath() } } class ViewController: UIViewController, UIScrollViewDelegate { let scrollView = UIScrollView() let pianoRollView = PianoRollView() // Create a container view to hold both the PianoRollView and the ButtonView let containerView = UIView() override func viewDidLoad() { super.viewDidLoad() // Add the UIScrollView to the view controller's view view.addSubview(scrollView) // Set the container view as the content view of the scroll view scrollView.addSubview(containerView) // Disable the autoresizing mask for both the UIScrollView and the PianoRollView scrollView.translatesAutoresizingMaskIntoConstraints = false pianoRollView.translatesAutoresizingMaskIntoConstraints = false // Set the constraints for the UIScrollView to fill the view controller's view scrollView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true scrollView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true scrollView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true scrollView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true // Initialize the piano roll view pianoRollView.frame = CGRect(x: 0, y: 0, width: 2000, height: 2000) pianoRollView.layer.zPosition = 1 containerView.frame = pianoRollView.frame containerView.addSubview(pianoRollView) // Set the constraints for the PianoRollView to fill the container view pianoRollView.leadingAnchor.constraint(equalTo: containerView.leadingAnchor).isActive = true pianoRollView.trailingAnchor.constraint(equalTo: containerView.trailingAnchor).isActive = true pianoRollView.topAnchor.constraint(equalTo: containerView.topAnchor).isActive = true pianoRollView.bottomAnchor.constraint(equalTo: containerView.bottomAnchor).isActive = true pianoRollView.widthAnchor.constraint(equalTo: containerView.widthAnchor).isActive = true // Set the constraints for the container view to fill the scroll view containerView.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor).isActive = true containerView.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor).isActive = true containerView.topAnchor.constraint(equalTo: scrollView.topAnchor).isActive = true containerView.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor).isActive = true containerView.widthAnchor.constraint(equalTo: scrollView.widthAnchor).isActive = true containerView.heightAnchor.constraint(equalTo: scrollView.heightAnchor).isActive = true // Add a UIView under the PianoRollView let buttonView = UIView() buttonView.translatesAutoresizingMaskIntoConstraints = false buttonView.frame = pianoRollView.frame containerView.addSubview(buttonView) // Set the constraints for the ButtonView to align with the PianoRollView buttonView.leadingAnchor.constraint(equalTo: containerView.leadingAnchor).isActive = true buttonView.trailingAnchor.constraint(equalTo: containerView.trailingAnchor).isActive = true buttonView.topAnchor.constraint(equalTo: containerView.topAnchor).isActive = true buttonView.bottomAnchor.constraint(equalTo: containerView.bottomAnchor).isActive = true buttonView.heightAnchor.constraint(equalTo: containerView.heightAnchor).isActive = true // calculate size of notes let noteHeight = Int(round(pianoRollView.frame.height / CGFloat(pianoRollView.numN)) ) // Add buttons to the buttonView with the same height as the space between the grids for i in 0..<pianoRollView.numN { let button = UIButton() button.translatesAutoresizingMaskIntoConstraints = false buttonView.addSubview(button) button.leadingAnchor.constraint(equalTo: buttonView.leadingAnchor).isActive = true button.trailingAnchor.constraint(equalTo: buttonView.trailingAnchor).isActive = true button.topAnchor.constraint(equalTo: buttonView.topAnchor, constant: CGFloat(i) * CGFloat(noteHeight)).isActive = true button.bottomAnchor.constraint(equalTo: buttonView.topAnchor, constant: CGFloat(i+1) * CGFloat(noteHeight)).isActive = true button.setTitle("Button \(i)", for: .normal) button.setTitleColor(.black, for: .normal) button.backgroundColor = .red } // Set the content size of the scroll view to match the size of the piano roll view scrollView.contentSize = containerView.bounds.size // Enable scrolling in both directions scrollView.isScrollEnabled = true scrollView.showsVerticalScrollIndicator = true scrollView.showsHorizontalScrollIndicator = true // Set the background color of the piano roll view to white pianoRollView.backgroundColor = UIColor.clear // Set the delegate of the scroll view to self scrollView.delegate = self // Set the minimum zoom scale let minZoomScale = max(view.bounds.width / pianoRollView.bounds.width, view.bounds.height / pianoRollView.bounds.height) scrollView.minimumZoomScale = minZoomScale // scrollView.minimumZoomScale = 1 scrollView.maximumZoomScale = 5 } // Return the container view in the viewForZooming method func viewForZooming(in scrollView: UIScrollView) -> UIView? { return containerView } func scrollViewDidZoom(_ scrollView: UIScrollView) { // Adjust the content offset so that the content stays centered when zooming let horizontalInset = max(0, (scrollView.bounds.width - scrollView.contentSize.width) / 2) let verticalInset = max(0, (scrollView.bounds.height - scrollView.contentSize.height) / 2) scrollView.contentInset = UIEdgeInsets(top: verticalInset, left: horizontalInset, bottom: verticalInset, right: horizontalInset) } } 部分问题是您将显式框架设置与约束混合在一起。 通常在使用 UIScrollView 时，我们要么设置框架，要么 .contentSize OR 我们使用约束并让自动布局为我们完成所有工作。 将代码组织成“相关”任务会很有帮助。例如： 创建视图和设置属性 将所有视图添加到层次结构 设置约束 做任何额外的任务 对于您的项目，scrollView / pianoRollView / containerView 被创建为类属性，因此 viewDidLoad() 中的第一件事将是： // buttons will go under the PianoRollView let buttonView = UIView() 接下来，将它们添加到视图层次结构中： // Add the UIScrollView to the view controller's view view.addSubview(scrollView) // Set the container view as the content view of the scroll view scrollView.addSubview(containerView) // add buttonView to containerView containerView.addSubview(buttonView) // add pianoRollView to containerView containerView.addSubview(pianoRollView) 我们想使用自动布局，所以跟着： // we will use auto-layout on all views scrollView.translatesAutoresizingMaskIntoConstraints = false containerView.translatesAutoresizingMaskIntoConstraints = false buttonView.translatesAutoresizingMaskIntoConstraints = false pianoRollView.translatesAutoresizingMaskIntoConstraints = false 现在我们可以对所有这些视图设置约束，相对于彼此...... // we (almost) always want to respect the safe area let safeG = view.safeAreaLayoutGuide // we want to constrain scrollView subviews to the scrollView's Content Layout Guide let contentG = scrollView.contentLayoutGuide NSLayoutConstraint.activate([ // Set the constraints for the UIScrollView to fill the view controller's view (safe area) scrollView.leadingAnchor.constraint(equalTo: safeG.leadingAnchor), scrollView.trailingAnchor.constraint(equalTo: safeG.trailingAnchor), scrollView.topAnchor.constraint(equalTo: safeG.topAnchor), scrollView.bottomAnchor.constraint(equalTo: safeG.bottomAnchor), // constrain containerView to Content Layout Guide // this will define the "scrollable area" // so we won't be setting .contentSize anywhere containerView.leadingAnchor.constraint(equalTo: contentG.leadingAnchor), containerView.trailingAnchor.constraint(equalTo: contentG.trailingAnchor), containerView.topAnchor.constraint(equalTo: contentG.topAnchor), containerView.bottomAnchor.constraint(equalTo: contentG.bottomAnchor), // constrain all 4 sides of buttonView to containerView buttonView.leadingAnchor.constraint(equalTo: containerView.leadingAnchor), buttonView.trailingAnchor.constraint(equalTo: containerView.trailingAnchor), buttonView.topAnchor.constraint(equalTo: containerView.topAnchor), buttonView.bottomAnchor.constraint(equalTo: containerView.bottomAnchor), // constrain all 4 sides of pianoRollView to containerView pianoRollView.leadingAnchor.constraint(equalTo: containerView.leadingAnchor), pianoRollView.trailingAnchor.constraint(equalTo: containerView.trailingAnchor), pianoRollView.topAnchor.constraint(equalTo: containerView.topAnchor), pianoRollView.bottomAnchor.constraint(equalTo: containerView.bottomAnchor), // pianoRollView width pianoRollView.widthAnchor.constraint(equalToConstant: 2000.0), ]) 请注意，我们确实NOT在heightAnchor上设置了pianoRollView。你会明白为什么...... 您还向numN 添加了buttonView 按钮...在对上述视图设置约束后 更有意义。 您的代码表明您希望 pianoView（以及 buttonView）的高度为 2000。然后您希望用 numN 按钮均匀填充该高度。 在您发布的代码中，您正在像这样计算按钮的高度： let noteHeight = Int(round(pianoRollView.frame.height / CGFloat(pianoRollView.numN)) ) 所以，高度是 2000，numN 是 127： 2000.0 / 127.0 == 15.748031496062993 你正在使用 round()，这很好，因为不使用部分点是个好主意。 如果我们使用round()，我们得到： round(2000.0 / 127.0) == 16.0 但是，如果我们有 127 个按钮，每个按钮的高度都是 16... 16 * 127 == 2032 所以我们不会看到底部的两个按钮！ 我们可以尝试使用 floor() ...我们得到： floor(2000.0 / 127.0) == 15 但是，如果我们有 127 个按钮，每个按钮的高度都是 15... 15 * 127 == 1905 所以我们在底部有一个95分的“差距”！ 您可能想要做的是使用 floor() 和 ceil()，然后比较这些值以查看哪个 最接近 2000。 这可以写成更少的行，但为了澄清： // in this example, pianoRollView.numN is 127 let targetHeight: CGFloat = 2000.0 let floatNumN: CGFloat = CGFloat(pianoRollView.numN) let noteH1: CGFloat = floor(targetHeight / floatNumN) // == 15.0 let noteH2: CGFloat = ceil(targetHeight / floatNumN) // == 16.0 let totalHeight1: CGFloat = noteH1 * floatNumN // == 1905 let totalHeight2: CGFloat = noteH2 * floatNumN // == 2032 let diff1: CGFloat = abs(targetHeight - totalHeight1) // == 95 let diff2: CGFloat = abs(targetHeight - totalHeight2) // == 32 // if diff1 is less than diff2, use noteH1 else noteH2 let noteHeight: CGFloat = diff1 < diff2 ? noteH1 : noteH2 noteHeight 现在等于 16 和 totalHeight 等于 2032 ... about 2000. 与其在 buttonView 上设置高度然后循环并设置按钮的框架，不如继续利用自动布局。 我们将创建约束的“垂直链”： 将first按钮的顶部约束到buttonView的顶部 将每个后续按钮的顶部限制在其上方按钮的底部 将last按钮的底部约束到buttonView的底部 现在的约束链： 确定buttonView的高度 这也决定了 pianoRollView 的高度 这也决定了 containerView 的高度 定义 .contentSize——“可滚动区域” 您遇到的另一个问题是您对按钮的noteHeight使用不同的计算： let noteHeight = Int(round(pianoRollView.frame.height / CGFloat(pianoRollView.numN)) ) 对于pianoRollView中的水平线： let noteHeight = rect.height / CGFloat(numN) 所以你的每个按钮都有16-points的高度，但是你的线间隔为15.748031496062993。 更好的选择是使noteHeight成为pianoRollView的属性......并在您计算noteHeight（按钮高度）时设置它viewDidLoad()。不需要再计算了。 这是完整的东西，还有一些额外的修改。通读评论，以便您了解发生了什么： class PianoRollView: UIView { var noteHeight: CGFloat = 0 var numN = 127 var numT = 4 override func draw(_ rect: CGRect) { super.draw(rect) // Draw the grid let context = UIGraphicsGetCurrentContext() context?.setStrokeColor(UIColor.black.cgColor) context?.setLineWidth(1.0) // UIKit *may* tell us to draw only PART of the view // (the rect), so use bounds instead of rect // noteHeight will be set by the controller // when it calculates the button heights // let noteHeight = rect.height / CGFloat(numN) for i in 1..<numN { let y = CGFloat(i) * noteHeight context?.move(to: CGPoint(x: 0, y: y)) context?.addLine(to: CGPoint(x: bounds.width, y: y)) } let timeSlotWidth = bounds.width / CGFloat(numT) for i in 1..<numT { let x = CGFloat(i) * timeSlotWidth context?.move(to: CGPoint(x: x, y: 0)) context?.addLine(to: CGPoint(x: x, y: bounds.height)) } // Add line to right of grid context?.move(to: CGPoint(x: bounds.width, y: 0)) context?.addLine(to: CGPoint(x: bounds.width, y: bounds.height)) // Add line to left of grid context?.move(to: CGPoint(x: 0, y: 0)) context?.addLine(to: CGPoint(x: 0, y: bounds.height)) // Add line to top of grid context?.move(to: CGPoint(x: 0, y: 0)) context?.addLine(to: CGPoint(x: bounds.width, y: 0)) // Draw bottom line context?.move(to: CGPoint(x: 0, y: bounds.height)) context?.addLine(to: CGPoint(x: bounds.width, y: bounds.height)) context?.strokePath() } } class PianoViewController: UIViewController, UIScrollViewDelegate { let scrollView = UIScrollView() let pianoRollView = PianoRollView() // Create a container view to hold both the PianoRollView and the ButtonView let containerView = UIView() override func viewDidLoad() { super.viewDidLoad() view.backgroundColor = UIColor(white: 0.95, alpha: 1.0) // buttons will go under the PianoRollView let buttonView = UIView() // Add the UIScrollView to the view controller's view view.addSubview(scrollView) // Set the container view as the content view of the scroll view scrollView.addSubview(containerView) // add buttonView to containerView containerView.addSubview(buttonView) // add pianoRollView to containerView containerView.addSubview(pianoRollView) // we will use auto-layout on all views scrollView.translatesAutoresizingMaskIntoConstraints = false containerView.translatesAutoresizingMaskIntoConstraints = false buttonView.translatesAutoresizingMaskIntoConstraints = false pianoRollView.translatesAutoresizingMaskIntoConstraints = false // we (almost) always want to respect the safe area let safeG = view.safeAreaLayoutGuide // we want to constrain scrollView subviews to the scrollView's Content Layout Guide let contentG = scrollView.contentLayoutGuide NSLayoutConstraint.activate([ // Set the constraints for the UIScrollView to fill the view controller's view (safe area) scrollView.leadingAnchor.constraint(equalTo: safeG.leadingAnchor), scrollView.trailingAnchor.constraint(equalTo: safeG.trailingAnchor), scrollView.topAnchor.constraint(equalTo: safeG.topAnchor), scrollView.bottomAnchor.constraint(equalTo: safeG.bottomAnchor), // constrain containerView to Content Layout Guide // this will define the "scrollable area" // so we won't be setting .contentSize anywhere containerView.leadingAnchor.constraint(equalTo: contentG.leadingAnchor), containerView.trailingAnchor.constraint(equalTo: contentG.trailingAnchor), containerView.topAnchor.constraint(equalTo: contentG.topAnchor), containerView.bottomAnchor.constraint(equalTo: contentG.bottomAnchor), // constrain all 4 sides of buttonView to containerView buttonView.leadingAnchor.constraint(equalTo: containerView.leadingAnchor), buttonView.trailingAnchor.constraint(equalTo: containerView.trailingAnchor), buttonView.topAnchor.constraint(equalTo: containerView.topAnchor), buttonView.bottomAnchor.constraint(equalTo: containerView.bottomAnchor), // constrain all 4 sides of pianoRollView to containerView pianoRollView.leadingAnchor.constraint(equalTo: containerView.leadingAnchor), pianoRollView.trailingAnchor.constraint(equalTo: containerView.trailingAnchor), pianoRollView.topAnchor.constraint(equalTo: containerView.topAnchor), pianoRollView.bottomAnchor.constraint(equalTo: containerView.bottomAnchor), // pianoRollView width 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the buttonView // we can constrain them vertically to each other var previousButton: UIButton! for i in 0..<pianoRollView.numN { let button = UIButton() button.translatesAutoresizingMaskIntoConstraints = false buttonView.addSubview(button) button.leadingAnchor.constraint(equalTo: buttonView.leadingAnchor).isActive = true button.trailingAnchor.constraint(equalTo: buttonView.trailingAnchor).isActive = true button.heightAnchor.constraint(equalToConstant: noteHeight).isActive = true if previousButton == nil { // constrain FIRST button to Top of buttonView button.topAnchor.constraint(equalTo: buttonView.topAnchor).isActive = true } else { // constrain other buttons to Bottom of Previous Button button.topAnchor.constraint(equalTo: previousButton.bottomAnchor).isActive = true } // update previousButton to the current button previousButton = button button.setTitle("Button \(i)", for: .normal) button.setTitleColor(.black, for: .normal) button.backgroundColor = .red } // constrain bottom of LAST button to bottom of buttonsView previousButton.bottomAnchor.constraint(equalTo: buttonView.bottomAnchor).isActive = true // so, our buttons are constrained with a "vertical chain" inside buttonView // which determines the height of buttonView // which also determines the height of pianoRollView // which also determines the height of containerView // which defines the .contentSize -- the "scrollable area" // set the noteHeight in pianoRollView so it will match // pianoRollView no longer needs to re-caluclate the "line spacing" pianoRollView.noteHeight = noteHeight // these all default to True, so not needed // Enable scrolling in both directions //scrollView.isScrollEnabled = true //scrollView.showsVerticalScrollIndicator = true //scrollView.showsHorizontalScrollIndicator = true // Set the background color of the piano roll view to clear pianoRollView.backgroundColor = UIColor.clear // Set the delegate of the scroll view to self scrollView.delegate = self // Set the minimum zoom scale // can't do this here... views have not been laid-out yet // so do it in viewDidAppear //let minZoomScale = max(view.bounds.width / pianoRollView.bounds.width, view.bounds.height / pianoRollView.bounds.height) //scrollView.minimumZoomScale = minZoomScale scrollView.maximumZoomScale = 5 // during development, so we can see the scrollView framing scrollView.backgroundColor = .systemBlue } override func viewDidAppear(_ animated: Bool) { super.viewDidAppear(animated) // views have been laid-out, so now we can use their frames/bounds to calculate minZoomScale let minZoomScale = min(scrollView.frame.width / pianoRollView.bounds.width, scrollView.frame.height / pianoRollView.bounds.height) scrollView.minimumZoomScale = minZoomScale } // Return the container view in the viewForZooming method func viewForZooming(in scrollView: UIScrollView) -> UIView? { return containerView } func scrollViewDidZoom(_ scrollView: UIScrollView) { // Adjust the content offset so that the content stays centered 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我正在构建一个应用程序，我想显示一个平面图，其中图像是1260x1000，大于我的视图控制器的大小。我希望用户能够平移图像，放大和...

BSimagepicker在分页滚动视图中只显示最后选择的图片的问题 Swift

我的Bsimagepicker允许我选择3张图片，并将它们放置在分页uiscrollview中，但前两张图片不见了，最后一张图片显示出来，在发生变化之前，我的工作是正常的。

分页和UITableView？

当用户垂直滚动时，UITableView会改变行数！可以为UITableView行添加分页吗？

动态地找到合适的缩放比例以适应视图的一部分。

我有一个网格视图，它就像一个棋盘。层次结构是这样的 。UIScrollView---UIView---【UIViews】这是一张截图。知道一个瓷砖的宽度和高度是tileSide，我怎么能找到......？

如果CollectionView在一个UIScrollView里面，如何设置UICollectionView项目大小？

我在故事板中添加的UIScrollView的最后有一个UICollectionView。滚动视图的内容高度是通过autolayout固定的），也是我通过返回集合视图的单元格大小 ...