在所有选项卡中都有一个可见的视图(UITabBarController) [英] Having a single view visible in all tabs (UITabBarController)

问题描述

如何在UITabViewController的所有选项卡中显示单个视图(UIButton)?

How can I have a single view (UIButton) visible in all tabs of a UITabViewController?

例如，我需要在所有选项卡中保持单个信息"按钮可见，而不是将其添加到所有选项卡的XIB中，并且不重写所有选项卡中的重复代码.

For example I need to keep a single "info" button visible in all tabs, and not add it to XIBs of all tabs and not rewrite repeated code in all tabs.

推荐答案

实现选项卡栏控制器类，并在 viewDidLoad 方法中，遍历所有选项卡栏视图控制器并以编程方式添加按钮.

Implement a Tab Bar Controller class and in the viewDidLoad method, loop through all the Tab Bar View Controllers and programmatically add your button.

- (void)viewDidLoad
{
    [super viewDidLoad];
    for(UIViewController *viewController in [self viewControllers]){
        UIButton *infoButton =  [UIButton buttonWithType:UIButtonTypeInfoDark];
        CGRect buttonRect = infoButton.frame;

        // This will place the button 20px away from the top right corner
        buttonRect.origin.x = self.view.frame.size.width - buttonRect.size.width - 20;
        buttonRect.origin.y = 20;
        [infoButton setFrame:buttonRect];

        [infoButton addTarget:self action:@selector(showInfo:) forControlEvents:UIControlEventTouchUpInside];
        [viewController.view addSubview:infoButton];
    }
}

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