UIWindow addSubview位置

Question

我试图在特定位置(右下角)的UIWindow上添加一个按钮。该按钮在视图上显示得很好，但位置不对。它总是出现在左上角(x: 0，y: 0)。

我怎么能这么做？

我的代码：

@IBOutlet var myButton: ANLongTapButton!

// MARK: - View Lifecycle
override func viewDidLoad() {
    super.viewDidLoad()

    let titleString = "Title\n"
    let hintString = "SubTitle"
    let title = NSMutableAttributedString(string: titleString + hintString)
    let titleAttributes = [NSForegroundColorAttributeName: UIColor.whiteColor(), NSBackgroundColorAttributeName: UIColor.clearColor(), NSFontAttributeName: UIFont(name: "HelveticaNeue-Light", size: 18)!]
    let hitAttributes = [NSForegroundColorAttributeName: UIColor.whiteColor(), NSBackgroundColorAttributeName: UIColor.clearColor(), NSFontAttributeName: UIFont(name: "HelveticaNeue-Light", size: 12)!]
    title.setAttributes(titleAttributes, range: NSMakeRange(0, titleString.characters.count))
    title.setAttributes(hitAttributes, range: NSMakeRange(titleString.characters.count, hintString.characters.count))

    myButton.titleLabel?.lineBreakMode = .ByWordWrapping
    myButton.titleLabel?.textAlignment = .Center
    myButton.setAttributedTitle(title, forState: .Normal)

    let win:UIWindow = UIApplication.sharedApplication().delegate!.window!!
    win.addSubview(myButton)
}

注意:我试图在UIWindow上添加我的按钮，因为我还需要在其他视图控制器上添加该按钮。

我正在使用这按钮库。

UPDATE I通过添加约束来解决问题：

@IBOutlet var myButton: ANLongTapButton!

// MARK: - View Lifecycle
override func viewDidLoad() {
    super.viewDidLoad()

    let titleString = "Title\n"
    let hintString = "SubTitle"
    let title = NSMutableAttributedString(string: titleString + hintString)
    let titleAttributes = [NSForegroundColorAttributeName: UIColor.whiteColor(), NSBackgroundColorAttributeName: UIColor.clearColor(), NSFontAttributeName: UIFont(name: "HelveticaNeue-Light", size: 18)!]
    let hitAttributes = [NSForegroundColorAttributeName: UIColor.whiteColor(), NSBackgroundColorAttributeName: UIColor.clearColor(), NSFontAttributeName: UIFont(name: "HelveticaNeue-Light", size: 12)!]
    title.setAttributes(titleAttributes, range: NSMakeRange(0, titleString.characters.count))
    title.setAttributes(hitAttributes, range: NSMakeRange(titleString.characters.count, hintString.characters.count))

    myButton.titleLabel?.lineBreakMode = .ByWordWrapping
    myButton.titleLabel?.textAlignment = .Center
    myButton.setAttributedTitle(title, forState: .Normal)

    let win:UIWindow = UIApplication.sharedApplication().delegate!.window!!
    win.addSubview(myButton)

    win.addConstraint(NSLayoutConstraint(item: myButton, attribute: NSLayoutAttribute.Right, relatedBy: NSLayoutRelation.Equal, toItem: win, attribute: NSLayoutAttribute.Right, multiplier: 1, constant: -10))
    win.addConstraint(NSLayoutConstraint(item: myButton, attribute: NSLayoutAttribute.Bottom, relatedBy: NSLayoutRelation.Equal, toItem: win, attribute: NSLayoutAttribute.Bottom, multiplier: 1, constant: -10))
}

Answer 1

要在正确的位置上显示子视图(按钮)，必须指定其约束或设置框架。当您将某些视图的子视图添加到另一个视图时，约束和位置不会被携带。