通用iOS應用中的自定義TabBar

Question

我希望重新創建在許多應用程序中看到的凸起的標簽欄，但希望在需要更改凸起位置的通用應用程序中執行此操作。

目前，我創建它的運氣並不好，因此來這里啟發一下是可以的，否則，我可能只是創建一個自定義的標簽欄背景。

如果是這種情況，是否可以在應用程序委托中區分兩個設備？

if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {

UITarBar *tabBar = [UITabBar appearance];
[tabBar setBackgroundImage: [UIImage imageNamed:@"iPadtabBar.png"]];

}
else {

UITarBar *tabBar = [UITabBar appearance];
[tabBar setBackgroundImage: [UIImage imageNamed:@"iPhonetabBar.png"]];

}

您可能在想，為什么他不只是進行測試..那樣會更容易，如果可以，我寧願先問也不問，但是直到下周初我才恢復Mac！

Answer 1

您將必須繼承UITabBarController並自定義該中心選項卡按鈕。 這里有一個做得很好的例子： https : //github.com/boctor/idev-recipes/tree/master/RaisedCenterTabBar/Classes

頭文件：@interface CustomTabBarViewController：UITabBarController {}

// Create a view controller and setup it's tab bar item with a title and image
-(UIViewController*) viewControllerWithTabTitle:(NSString*)title image:(UIImage*)image;

// Create a custom UIButton and add it to the center of our tab bar
-(void) addCenterButtonWithImage:(UIImage*)buttonImage highlightImage:(UIImage*)highlightImage;

@end

實施文件：

@implementation CustomTabBarViewController

// Create a view controller and setup it's tab bar item with a title and image
-(UIViewController*) viewControllerWithTabTitle:(NSString*) title image:(UIImage*)image
{
    UIViewController* viewController = [[UIViewController alloc] init];
    viewController.tabBarItem = [[UITabBarItem alloc] initWithTitle:title image:image tag:0];
    return viewController;
}

// Create a custom UIButton and add it to the center of our tab bar
-(void) addCenterButtonWithImage:(UIImage*)buttonImage highlightImage:(UIImage*)highlightImage
{
    UIButton* button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.autoresizingMask = UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleTopMargin;
    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];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return YES;
}

@end