ios - 当我移动 View 的框架时它不会移动 : why?

Question

我正在尝试将一个栏(除其他外)固定到屏幕底部。代码是:

    var screen = UIScreen.mainScreen()
    var bottom_view = view.viewWithTag(bottom_panel_tag)!
    var pad = bottom_view.frame.minX // is 0
    var screen_h = screen.bounds.maxY
    var screen_w = screen.bounds.maxX

    var b = CGRectMake( pad, screen_h - ( pad + bottom_view.frame.height ), screen_w - 2*pad, bottom_view.frame.height )
    bottom_view.frame = b
    bottom_view.setNeedsDisplay()

这在 viewDidLoad 中调用，我已将其放入调试器中，因此我知道它正在运行。 View 不会移动(或我更改的任何其他 View )。没有任何限制。我做错了什么？

Answer 1

试试这个:

self.view.removeConstraints(self.view.constraints())
bottom_view.setTranslatesAutoresizingMaskIntoConstraints(true)

在更改其框架之前，将此行添加到 viewDidLoad() 中。

Explanation: Even if you don't add any Autolayout constraint it will add at runtime if you create views using Storyboard & if you don't want to use this solution then you should create view programatically then it will change frame using your code only.