Question

我使用以下代码创建并按下按钮触摸视图控制器作为附加到按钮的实用方法

 func createSmartController() -> UIViewController{

    //Create controller and get view
                var controller = UIViewController()
                var view = controller.view
                var tag:String
                var count = 0

                //Create and layout scroll view
                var scrollView = UIScrollView()
                scrollView.setTranslatesAutoresizingMaskIntoConstraints(false)
                view.addSubview(scrollView)
                view.addConstraint(NSLayoutConstraint(item: scrollView, attribute: NSLayoutAttribute.Top, relatedBy: NSLayoutRelation.Equal, toItem: view, attribute: NSLayoutAttribute.Top, multiplier: 1.0, constant: 0.0))
                view.addConstraint(NSLayoutConstraint(item: scrollView, attribute: NSLayoutAttribute.Bottom, relatedBy: NSLayoutRelation.Equal, toItem: view, attribute: NSLayoutAttribute.Bottom, multiplier: 1.0, constant: 0.0))
                view.addConstraint(NSLayoutConstraint(item: scrollView, attribute: NSLayoutAttribute.Leading, relatedBy: NSLayoutRelation.Equal, toItem: view, attribute: NSLayoutAttribute.Leading, multiplier: 1.0, constant: 0.0))
                view.addConstraint(NSLayoutConstraint(item: scrollView, attribute: NSLayoutAttribute.Trailing, relatedBy: NSLayoutRelation.Equal, toItem: view, attribute: NSLayoutAttribute.Trailing, multiplier: 1.0, constant: 0.0))

                //Create and add content view
                var scrollContent = UIView()
                scrollContent.setTranslatesAutoresizingMaskIntoConstraints(false)
                scrollView.addSubview(scrollContent)
                scrollView.addConstraint(NSLayoutConstraint(item: scrollContent, attribute: NSLayoutAttribute.Top, relatedBy: NSLayoutRelation.Equal, toItem: scrollView, attribute: NSLayoutAttribute.Top, multiplier: 1.0, constant: 0.0))
                scrollView.addConstraint(NSLayoutConstraint(item: scrollContent, attribute: NSLayoutAttribute.Bottom, relatedBy: NSLayoutRelation.Equal, toItem: scrollView, attribute: NSLayoutAttribute.Bottom, multiplier: 1.0, constant: 0.0))
                scrollView.addConstraint(NSLayoutConstraint(item: scrollContent, attribute: NSLayoutAttribute.Leading, relatedBy: NSLayoutRelation.Equal, toItem: scrollView, attribute: NSLayoutAttribute.Leading, multiplier: 1.0, constant: 0.0))
                scrollView.addConstraint(NSLayoutConstraint(item: scrollContent, attribute: NSLayoutAttribute.Trailing, relatedBy: NSLayoutRelation.Equal, toItem: scrollView, attribute: NSLayoutAttribute.Trailing, multiplier: 1.0, constant: 0.0))
                view.addConstraint(NSLayoutConstraint(item: scrollContent, attribute: NSLayoutAttribute.Leading, relatedBy: NSLayoutRelation.Equal, toItem: view, attribute: NSLayoutAttribute.Leading, multiplier: 1.0, constant: 0.0))
                view.addConstraint(NSLayoutConstraint(item: scrollContent, attribute: NSLayoutAttribute.Trailing, relatedBy: NSLayoutRelation.Equal, toItem: view, attribute: NSLayoutAttribute.Trailing, multiplier: 1.0, constant: 0.0))

                //Create all buttons
                var buttons = self.GetMyButtons() //Just returns and array of UIButtons

                //Add buttons to view with constraints
                var prevButton:String
                var constH:NSArray
                var constV:NSArray
                var hString:String
                var vString:String
                var index = 0
                for button in buttons{
                    button.setTranslatesAutoresizingMaskIntoConstraints(false)
                    scrollContent.addSubview(button)
                    button.bounds.size.height = 90
                    scrollContent.addConstraint(NSLayoutConstraint(item: button, attribute: NSLayoutAttribute.Leading, relatedBy: NSLayoutRelation.Equal, toItem: scrollContent, attribute: NSLayoutAttribute.Leading, multiplier: 1.0, constant: 0.0))
                    scrollContent.addConstraint(NSLayoutConstraint(item: button, attribute: NSLayoutAttribute.Trailing, relatedBy: NSLayoutRelation.Equal, toItem: scrollContent, attribute: NSLayoutAttribute.Trailing, multiplier: 1.0, constant: 0.0))
                    if(index == 0){
                        scrollContent.addConstraint(NSLayoutConstraint(item: button, attribute: NSLayoutAttribute.Top, relatedBy: NSLayoutRelation.Equal, toItem: scrollContent, attribute: NSLayoutAttribute.Top, multiplier: 1.0, constant: 8.0))
                    }
                    else{
                        scrollContent.addConstraint(NSLayoutConstraint(item: button, attribute: NSLayoutAttribute.Top, relatedBy: NSLayoutRelation.Equal, toItem: buttons[index-1], attribute: NSLayoutAttribute.Bottom, multiplier: 1.0, constant: 8.0))
                    }
                    if(index == buttons.count-1){
                        scrollContent.addConstraint(NSLayoutConstraint(item: button, attribute: NSLayoutAttribute.Bottom, relatedBy: NSLayoutRelation.Equal, toItem: scrollContent, attribute: NSLayoutAttribute.Bottom, multiplier: 1.0, constant: -8.0))
                    }
                    index++
                }
return controller
    }

此方法用于以下调用，以在按钮touchupinside上生成并推送视图控制器

var controller = button.getSmartController()
            self.navigationController?.pushViewController(controller, animated: true)

但是，我推送的视图控制器似乎根本没有视图。它是黑色/空白。推动画也似乎有点麻烦。

Answer 1

所有背景颜色均不存在且显示为黑色。以编程方式创建元素时，还必须添加样式，否则所有默认值将返回为null / black。

以编程方式创建和推送视图控制器

1 个答案: