swift - 在没有 socket 的情况下以快速方式以编程方式创建 ScrollView

Question

我已经尝试了足够多，但我不明白代码有什么问题，当我创建一个 socket 时它工作正常，但后来我发现我不需要一个 socket ，所以想以编程方式创建它.

var BestPractices = UIScrollView(frame: CGRectMake(0, 94, 768, 924))
BestPractices.hidden = true

我无法访问 viewController 中“BestPractices”的属性，而相同的代码在 Playground 上运行良好

Answer 1

这是 this 的回答问题。 .

class ScrollingViewController : UIViewController {
// Create a scrollView property that we'll set as our view in -loadView
let scrollView = UIScrollView(frame: UIScreen.mainScreen().bounds)

override func loadView() {
    // calling self.view later on will return a UIView!, but we can simply call 
    // self.scrollView to adjust properties of the scroll view:
    self.view = self.scrollView

    // setup the scroll view
    self.scrollView.contentSize = CGSize(width:1234, height: 5678)
    // etc...
}

func example() {
    let sampleSubView = UIView()
    self.view.addSubview(sampleSubView) // adds to the scroll view

    // cannot do this:
    // self.view.contentOffset = CGPoint(x: 10, y: 20)
    // so instead we do this:
    self.scrollView.contentOffset = CGPoint(x: 10, y: 20)
}