将自定义中心按钮添加到选项卡栏的最佳方法是什么？

发布于 2024-12-06 03:57:26 字数 227 浏览 3 评论 0原文

许多应用程序都有一个标准选项卡栏，中间有一个自定义按钮，可以执行一些特殊功能。一些示例可以在这里找到：

http://mobile-patterns.com/custom-tab-navigation< /a>

实现这个的最佳方法是什么？

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濫情▎り 2024-12-13 03:57:26

此处您可以了解如何实现该按钮。我要粘贴代码，以便它永远留在这里：

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.tabBar.frame.size.height;
if (heightDifference < 0)
    button.center = self.tabBar.center;
else
{
    CGPoint center = self.tabBar.center;
    center.y = center.y - heightDifference/2.0;
    button.center = center;
}

[self.view addSubview:button];

希望有帮助

Here you can see how to implement that button. I am gonna paste the code so it stays here forever:

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.tabBar.frame.size.height;
if (heightDifference < 0)
    button.center = self.tabBar.center;
else
{
    CGPoint center = self.tabBar.center;
    center.y = center.y - heightDifference/2.0;
    button.center = center;
}

[self.view addSubview:button];

Hope it helps

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酒解孤独 2024-12-13 03:57:26

我对 Franciso 的代码进行了一些小的调整。我将代码放置在 Xcode 4.1 中标准选项卡栏应用程序模板的应用程序 didFinishLaunchingWithOptions 方法中。我相信 Xcode 4.2 可能有不同的模板。

UIImage *buttonImage = [UIImage imageNamed:@"tabItemOff.png"];
UIImage *highlightImage = [UIImage imageNamed:@"tabItemSelected.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;
}
[self.tabBarController.view addSubview:button];

I got Franciso's code working with a few minor tweaks. I placed the code in the application didFinishLaunchingWithOptions method of a standard Tab Bar Application template in Xcode 4.1. I believe Xcode 4.2 may have a different template.

UIImage *buttonImage = [UIImage imageNamed:@"tabItemOff.png"];
UIImage *highlightImage = [UIImage imageNamed:@"tabItemSelected.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;
}
[self.tabBarController.view addSubview:button];

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