我是iOS开发的初学者。我的问题是:是否可以将UITabBar放在顶部,如何放置?我无法将UITabBar放置在视图顶部。
有可能吗?可以,但是它违反了人机界面准则。
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TabController.h:
#import <UIKit/UIKit.h>
@interface TabController : UITabBarController <UITabBarControllerDelegate>
@end
TabController.m:
#import "TabController.h"
@interface TabController ()
@end
@implementation TabController
- (void)viewDidLoad
{
[super viewDidLoad];
self.delegate = self;
}
- (void)viewWillLayoutSubviews
{
[super viewWillLayoutSubviews];
[self.tabBar invalidateIntrinsicContentSize];
CGFloat tabSize = 44.0;
UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
if (UIInterfaceOrientationIsLandscape(orientation))
{
tabSize = 32.0;
}
CGRect tabFrame = self.tabBar.frame;
tabFrame.size.height = tabSize;
tabFrame.origin.y = self.view.frame.origin.y;
self.tabBar.frame = tabFrame;
// Set the translucent property to NO then back to YES to
// force the UITabBar to reblur, otherwise part of the
// new frame will be completely transparent if we rotate
// from a landscape orientation to a portrait orientation.
self.tabBar.translucent = NO;
self.tabBar.translucent = YES;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
@end
Swift3:为此,我为UITabBarController
创建了一个自定义类:
class CustomTabBarController: UITabBarController {
@IBOutlet weak var financialTabBar: UITabBar!
override func viewDidLoad() {
super.viewDidLoad()
// I've added this line to viewDidLoad
UIApplication.shared.statusBarFrame.size.height
financialTabBar.frame = CGRect(x: 0, y: financialTabBar.frame.size.height, width: financialTabBar.frame.size.width, height: financialTabBar.frame.size.height)
}
不要忘记将您的自定义类别设置为TabBarController
结果将是这样:
这里是一个有效的aviatorken89代码的3示例。
将以下代码添加到类中。
override func viewWillLayoutSubviews() {
super.viewWillLayoutSubviews()
var tabFrame:CGRect = self.tabBar.frame
tabFrame.origin.y = self.view.frame.origin.y
self.tabBar.frame = tabFrame
}
如果使用故事板,请确保通过“身份检查器”将选项卡栏类更改为自定义类。
override func viewWillLayoutSubviews() {
super.viewWillLayoutSubviews()
tabBar.frame = CGRect(x: 0, y: 0, width: tabBar.frame.size.width, height: tabBar.frame.size.height)
}
更新IOS 11问题
上面的代码在ios 11上不起作用,所以这是我发现的解决方法。
override func viewDidLayoutSubviews() {
tabBar.frame = CGRect(x: 0, y: 0, width: tabBar.frame.size.width, height: tabBar.frame.size.height)
super.viewDidLayoutSubviews()
}
TabbarController的子视图隐藏在Tabbar的背面。因此,使用此代码进行修复:
class CustomTabBarController: UITabBarController ,UITabBarControllerDelegate{
override func viewDidLayoutSubviews() {
tabBar.frame = CGRect(x: 0, y: 0, width: tabBar.frame.size.width, height: tabBar.frame.size.height)
super.viewDidLayoutSubviews()
delegate = self
selectedViewController?.view.frame.origin = CGPoint(x: 0, y: tabBar.frame.size.height)
}
func tabBarController(_ tabBarController: UITabBarController, didSelect viewController: UIViewController) {
selectedViewController?.view.frame.origin = CGPoint(x: 0, y: tabBar.frame.size.height)
}
}
您可以通过自己制作来创建自定义选项卡,但是苹果强烈不建议将系统控件模仿其原本不打算使用的功能。
再次,我不鼓励您这样做,因为它违反了您的应用程序和系统应用程序的一致性。但是因为我在做,所以我们开始:
对于自定义标签栏,您需要创建一个包含多个按钮的视图。您还需要UITabBar
的容器视图以下](因为您希望UITabBar
位于顶部)。按下按钮时,将更改容器内的UIViewController
。它非常简单,但是当然不建议这样做。
Swift 5
如果要在顶部放置类似UITabBar的东西,那么如何创建自定义UIView并在其中添加任意数量的UIButton。然后通过Segue将一些ViewController与每个按钮链接。做完了!