将UITabBar定位在顶部 [英] Positioning UITabBar at the top

问题描述

我是iOS开发的初学者。我的问题是：是否可以将UITabBar定位在顶部以及如何定位？
我无法将我的UITabBar放在视图的顶部。

I'm a beginner in iOS development. My question is: is it possible to position UITabBar at the top and how? I can't position my UITabBar at the top of the view.

推荐答案

有可能吗？当然，但它违反了人机界面指南。

Is it possible? Sure, but it violates the human interface guidelines.

TabController .h：

TabController.h:

#import <UIKit/UIKit.h>

@interface TabController : UITabBarController <UITabBarControllerDelegate>

@end

TabController.m：

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

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