UITabBar屏幕顶部

Question

我需要将我的标签栏放在屏幕的顶部。

我试过，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 
    } 

问题是我，当我把我的设备的屏幕。

我应该重新生成这样的布局和变化：

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

我怎么能每次都改变这一点，你打开屏幕？

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

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; 
} 

定义UITabBar添加以下方法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) 
    } 
}