Swift：如何在View编程结束时设置按钮

Question

点击按钮，我已经以编程方式设置了UIWebView。

if(button.tag = 1)
{
    let webV:UIWebView = UIWebView(frame: CGRectMake(10, 80, (UIScreen.mainScreen().bounds.width)-20, (UIScreen.mainScreen().bounds.height)/2))
    webView.loadHTMLString(html!, baseURL: nil)

let button = UIButton(frame: CGRect(x: 100, y: 100, width: 100, height: 50))
  button.backgroundColor = .greenColor()
  button.setTitle("Test Button", forState: .Normal)
  button.addTarget(self, action: #selector(buttonAction), forControlEvents: .TouchUpInside)
  webView.addSubview(button)
self.view.addSubview(webV)
}

我尝试在webView末尾设置按钮，但我无法设置。我尝试了很多次，但我还在进行中。我想在我以编程方式创建的webView结尾处设置按钮。

Answer 1

使用父视图的bounds属性来定位子视图。

let bottomMargin = CGFloat(50) //Space between button and bottom of the screen
let buttonSize = CGSize(width: 100, height: 50)

let button = UIButton(frame: CGRect(
        x: 0, y: 0, width: buttonSize.width, height: buttonSize.height
    ))

button.center = CGPoint(x: parentView.bounds.size.width / 2,
                        y: parentView.bounds.size.height - buttonSize.height / 2 - bottomMargin)

Answer 2

如何以编程方式在视图末尾设置按钮

@IBOutlet弱var bottomView：UIView！ self.bottamView.addSubview（btnTrvalRpt）btnTrvalRpt.translatesAutoresizingMaskIntoConstraints = false btnTrvalRpt.centerXAnchor.constraint（equalTo：self.view.centerXAnchor）.isActive = true btnTrvalRpt.widthAnchor.Constraint（equalt = 50％） （equalToConstant：50）.isActive = true btnTrvalRpt.bottomAnchor.constraint（equalTo：self.view.bottomAnchor，常数：-20）.isActive = true –