UIWindow addSubview的位置

Question

我想在特定位置（右下角）的UIWindow上添加一个按钮。该按钮在视图上显示良好，但不在正确的位置。它总是出现在左上角（x：0，y：0）。

我该怎么做？

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：我想补充的一个UIWindow我的按钮，因为我需要对其他视图控制器按钮为好。

我正在使用this按钮库。

---

UPDATE 我通过添加约束解决了我的问题：

@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

要显示你必须指定其限制或设置框右侧位置的子视图（您的按钮）。当您将视图的子视图添加到另一个视图时，不会执行约束和位置。