我的目标是以编程方式创建多个 UILabel 和 UIButton,然后以编程方式创建它们并将其插入到 UIScrollView 中。
我在以下类(class)中操作。
class ViewController: UIViewController {
我首先创建了如下所示的 ScrollView 。
@IBOutlet weak var scrollView: UIScrollView!
override func viewDidLoad() {
super.viewDidLoad()
createTitleBar() //Function that creates fixed buttons and labels not included in scrollView
createUpperTabs() //Function that creates fixed buttons and labels not included in scrollView
createLowerNavBars() //Function that creates fixed buttons and labels not included in scrollView
for _ in 0...10 {
createTemplate() //This function consists of nested functions that creates labels and buttons that are then added to the scrollView
}
scrollView = UIScrollView(frame: view.bounds)
scrollView.backgroundColor = UIColor.black
scrollView.contentSize = CGSize(width: screenSize.width, height: currentStackY)
scrollView.autoresizingMask = UIViewAutoresizing.flexibleHeight
view.addSubview(scrollView)
}
创建标签和按钮后,我使用以下语句将 View 单独添加到 ScrollView 中
self.scrollView.addSubview(UILabel或UIButton名称)
。
这里有一些片段展示了我如何创建 UILabel 和 UIButton。
let titleHeader = UILabel()
self.scrollView.addSubview(titleHeader)
currentStackY += 8
titleHeader.backgroundColor = .gray
titleHeader.text = headerTitle
titleHeader.font = UIFont(name: buttonFont, size: buttonFontSize)
let labelWidth = titleHeader.intrinsicContentSize.width + 16
titleHeader.snp.makeConstraints { (make) in
make.height.equalTo(titleHeader)
make.width.equalTo(titleHeader)
make.top.equalTo(currentStackY)
make.left.equalTo(view).offset(8)
}
以及
for i in 0...chiefComplaintArray.count - 1 {
let btn = UIButton()
chiefComplaintButton.append(btn)
buttonDictionary[chiefComplaintButton[i]] = numberButtonPressed
chiefComplaintButton[i].setTitle(chiefComplaintArray[i], for: .normal)
chiefComplaintButton[i].setTitleColor(UIColor.black, for: .normal)
chiefComplaintButton[i].titleLabel!.font = UIFont(name: buttonFont, size: buttonFontSize)
chiefComplaintButton[i].backgroundColor = UIColor.gray
chiefComplaintButton[i].sizeToFit()
let buttonWidth = chiefComplaintButton[i].frame.width + 10
let buttonHeight = chiefComplaintButton[i].frame.height + 5
if i == 0 {
currentStackX = 20
currentStackY += 5
} else if (currentStackX + buttonWidth) > screenSize.width {
currentStackX = 20
currentStackY += buttonHeight + 5
}
chiefComplaintButton[i].frame = CGRect(x: currentStackX, y: currentStackY, width: buttonWidth, height: buttonHeight)
currentStackX += chiefComplaintButton[i].frame.width + 5
if i == chiefComplaintArray.count - 1 {
currentStackY += chiefComplaintButton[i].frame.height
}
self.scrollView.addSubview(chiefComplaintButton[i])
chiefComplaintButton[i].addTarget(self, action: #selector(self.buttonPressed), for: .touchUpInside)
}
我使用类似的语句将所有创建的内容添加到 ScrollView 中。我根据堆栈中的其他解决方案以及其他在线引用文献对 UIScrollView 进行了建模。预先感谢您的时间和考虑。
我随后尝试过
let titleHeader = UILabel()
scrollView.addSubview(titleHeader)
self.view.addSubview(scrollView)
currentStackY += 8
titleHeader.backgroundColor = .gray
titleHeader.text = headerTitle
titleHeader.font = UIFont(name: buttonFont, size: buttonFontSize)
let labelWidth = titleHeader.intrinsicContentSize.width + 16
仍然遇到同样的错误。
最佳答案
您的代码的问题是您在调用崩溃的方法后初始化您的 scrollView
,因为当时您的 scrollView
为零。
您需要在之后调用您的方法
view.addSubview(scrollView)
编辑
override func viewDidLoad() {
super.viewDidLoad()
for _ in 0...10 {
createTemplate() //This function consists of nested functions that creates labels and buttons that are then added to the scrollView
}
scrollView = UIScrollView(frame: view.bounds)
scrollView.backgroundColor = UIColor.black
scrollView.contentSize = CGSize(width: screenSize.width, height: currentStackY)
scrollView.autoresizingMask = UIViewAutoresizing.flexibleHeight
view.addSubview(scrollView)
createTitleBar() //Function that creates fixed buttons and labels not included in scrollView
createUpperTabs() //Function that creates fixed buttons and labels not included in scrollView
createLowerNavBars() //Function that creates fixed buttons and labels not included in scrollView
}
也来自这里
let titleHeader = UILabel()
scrollView.addSubview(titleHeader)
self.view.addSubview(scrollView)
currentStackY += 8
titleHeader.backgroundColor = .gray
titleHeader.text = headerTitle
titleHeader.font = UIFont(name: buttonFont, size: buttonFontSize)
let labelWidth = titleHeader.intrinsicContentSize.width + 16
删除这个
self.view.addSubview(scrollView)
关于ios - 在 Swift 中以编程方式将 UILabels 和 UIButtons 添加到 UIScrollView,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/40689574/