Question

我试图使用编程约束在UIScrollView中添加UIView，但我认为由于约束缺失，我无法看到UIView。当我试图通过CGRectMake添加其工作正常时我也检查了下面的代码，在视图层次结构中有UIScrollview内的视图。

我没有尝试过。解决方案但没有取得任何成功

UIScrollView with iOS Auto Layout Constraints: Wrong size for subviews

Programmatically creating controller with UIScrollView and AutoLayout is not sizing the views properly

这是我的代码

    vendorDetailsScrollView = UIScrollView()
    vendorDetailsScrollView!.translatesAutoresizingMaskIntoConstraints = false
    vendorDetailsScrollView!.backgroundColor = UIColor.redColor()
    self.view.addSubview(vendorDetailsScrollView!)

    vendorSubView = UIView()
    vendorSubView!.translatesAutoresizingMaskIntoConstraints = false
    vendorSubView!.backgroundColor = UIColor.greenColor()
    self.vendorDetailsScrollView!.addSubview(vendorSubView!)

    viewDictionary!["vendorDetailsScrollView"] = vendorDetailsScrollView!
    viewDictionary!["vendorSubView"] = vendorSubView!

    metricDictionary!["navigationHeight"] = navigationHeight
    metricDictionary!["vendorDetailsScrollViewHeight"] = self.view.frame.size.height  - navigationHeight
    metricDictionary!["vendorSubViewHeight"] =  100

    self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("|[vendorDetailsScrollView]|", options: NSLayoutFormatOptions(rawValue: 0), metrics: metricDictionary!, views: viewDictionary!))

    self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-navigationHeight-[vendorDetailsScrollView(vendorDetailsScrollViewHeight)]-|", options: NSLayoutFormatOptions(rawValue: 0), metrics: metricDictionary!, views: viewDictionary!))

    self.vendorDetailsScrollView!.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("|-[vendorSubView]-|", options: NSLayoutFormatOptions(rawValue: 0), metrics: metricDictionary!, views: viewDictionary!))

    self.vendorDetailsScrollView!.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-[vendorSubView(vendorSubViewHeight)]-|", options: NSLayoutFormatOptions(rawValue: 0), metrics: metricDictionary!, views: viewDictionary!))

Answer 1

您需要添加以下代码

self.vendorDetailsScrollView.addConstraint(NSLayoutConstraint(item: vendorSubView, attribute: .Width, relatedBy: .Equal, toItem: vendorDetailsScrollView, attribute: .Width, multiplier: 1.0, constant: 0))

而不是

self.vendorDetailsScrollView!.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("|-[vendorSubView]-|", options: NSLayoutFormatOptions(rawValue: 0), metrics: metricDictionary!, views: viewDictionary!))

Answer 2

在vendorDetailsScrollView中添加一个视图作为子视图，然后在子视图中添加所有子视图。

无法通过编程约束在UIScrollView中查看子视图

2 个答案: