在tabbarcontroller上添加按鈕

Question

是否可以使用界面生成器在tabbar控制器上添加按鈕？

我正在嘗試在界面生成器中執行此操作，但每次將按鈕添加到tabbar時，都會用按鈕填充屏幕的其餘部分，而不是將按鈕放在tabbar上。

像Instagram中的相機。

Answer 1

這是我如何解決了這個問題：

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view, typically from a nib. 
    UIImage *buttonImage = [UIImage imageNamed:@"cameraTabBarItem.png"]; 
    UIImage *highlightImage = [UIImage imageNamed:@"cameraTabBarItem.png"]; 
    UIButton* button = [UIButton buttonWithType:UIButtonTypeCustom]; 
    button.frame = CGRectMake(0.0, 0.0, buttonImage.size.width, buttonImage.size.height); 
    [button setBackgroundImage:buttonImage forState:UIControlStateNormal]; 
    [button setBackgroundImage:highlightImage forState:UIControlStateHighlighted]; 
    CGFloat heightDifference = buttonImage.size.height - self.tabBarController.tabBar.frame.size.height; 
    if (heightDifference < 0) 
     button.center = self.tabBarController.tabBar.center; 
    else 
    { 
     CGPoint center = self.tabBarController.tabBar.center; 
     center.y = center.y - heightDifference/2.0; 
     button.center = center; 
    } 
    [button addTarget:self action:@selector(share:) forControlEvents:UIControlEventTouchUpInside]; 
    [self.tabBarController.view addSubview:button]; 
} 

Answer 2

你可能需要添加按鈕，您的應用程序委託的窗口的子視圖：

[self.window addSubview:myButton];