ios - UITabBar 屏幕顶部

Question

我需要将标签栏放在屏幕顶部。

我试过了，我做到了，这是代码:

  override func viewDidLoad() {
        self.tabBar.frame = CGRectMake(0, 90, self.view.bounds.size.width, self.view.bounds.size.height);
        self.tabBar.autoresizingMask = UIViewAutoresizing.FlexibleWidth
  }

问题出在我转动设备屏幕时。

我应该重新生成布局并以这种方式更改:

self.tabBar.frame = CGRectMake(0, 80, self.view.bounds.size.width, self.view.bounds.size.height);

我怎样才能在每次转动屏幕时更改它？

编辑:

新代码:

  override func viewDidLayoutSubviews()
  {
        //check tabBar not null
        if (self.tabBar != nil)
        {
            //make changes in frame here according to orientation if any
            self.tabBar.frame = CGRect(x: 00, y: 20, width:self.view.bounds.size.width, height: 49)
        }
  }
  override func viewDidLoad() 
  {
     //Make changes in frame according to your requirement
    self.tabBar.frame = CGRectMake(0, 20, self.view.bounds.size.width,49);
    //resizing here
    self.tabBar.autoresizingMask = UIViewAutoresizing.FlexibleTopMargin;UIViewAutoresizing.FlexibleLeftMargin;UIViewAutoresizing.FlexibleWidth;UIViewAutoresizing.FlexibleRightMargin;
  }

Answer 1

在viewDidLoad中定义UITabBar

override func viewDidLoad() 
{
    //Make changes in frame according to your requirement
    self.tabBar.frame = CGRectMake(0, 20, self.view.bounds.size.width,49);
    //resizing here
    self.tabBar.autoresizingMask = UIViewAutoresizing.FlexibleTopMargin;UIViewAutoresizing.FlexibleLeftMargin;UIViewAutoresizing.FlexibleWidth;UIViewAutoresizing.FlexibleRightMargin;
}

添加下面的方法 viewDidLayoutSubviews

override func viewDidLayoutSubviews()
{
    //check tabBar not null
    if (self.tabBar != nil)
    {
        //make changes in frame here according to orientation if any
        self.tabBar.frame = CGRect(x: 00, y: 20, width:self.view.bounds.size.width, height: 49)
    }
}