xcode - 找到 X 轴的中间以放置标签 Swift Xcode 6

Question

我在 Swift 中有一个以编程方式创建的标签。无论设备的屏幕尺寸如何，我都试图将此标签定位在 x 轴的中间。我该怎么做？

    var label = UILabel(frame: CGRectMake(0, 0, 400, 50))
    label.textColor = UIColor.whiteColor()
    label.font = UIFont(name: label.font.fontName, size: 50)
    label.textAlignment = NSTextAlignment.Center
    label.text = "My label is cool"
    self.view?.addSubview(label)

Answer 1

使用 UIScreen.mainScreen().bounds.width 和 height 如下:

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    let label = UILabel(frame: CGRectMake(0, 0, UIScreen.mainScreen().bounds.width, UIScreen.mainScreen().bounds.height))
    label.textColor = UIColor.blackColor()
    label.font = UIFont(name: label.font.fontName, size: 50)
    label.textAlignment = NSTextAlignment.Center
    label.text = "My label is cool"
    self.view?.addSubview(label)

}