Ios 快速扩展导航栏高度并添加分段控制

我设计了以下UINavigationBar，但是我有点困惑是否可以添加下面这样的分段控件？实现这一目标的最佳方式是什么

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您可以按如下方式模拟您的需求：

-(void) segmentAction: (UISegmentedControl *) segmentedControl
{
    // Update the label with the segment number
    NSString *segmentNumber = [NSString stringWithFormat:@"%0d", 
        segmentedControl.selectedSegmentIndex + 1];
    [(UITextView *)self.view setText:segmentNumber];
}              
- (void) loadView
{
    [super loadView];

    // Create a central text view
    UITextView *textView = [[UITextView alloc] 
        initWithFrame:self.view.frame];
    textView.font = [UIFont fontWithName:@"Futura" size:96.0f];
    textView.textAlignment = UITextAlignmentCenter;
    self.view = textView;

    // Create the segmented control
    NSArray *buttonNames = [NSArray arrayWithObjects:
        @"Recent", @"Popular", @"My", nil];
    UISegmentedControl* segmentedControl = [[UISegmentedControl alloc] 
        initWithItems:buttonNames];
    segmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;
    segmentedControl.momentary = YES;
    [segmentedControl addTarget:self action:@selector(segmentAction:) 
        forControlEvents:UIControlEventValueChanged];

    // Add it to the navigation bar
    self.navigationItem.titleView = segmentedControl;
}

或者还有另一种方法，如下所示：

UISegmentedControl *segmentedControl = [[UISegmentedControl alloc] initWithItems:
                                            [NSArray arrayWithObjects:
[NSString stringWithString:NSLocalizedString(@"Recent", @"")],
[NSString stringWithString:NSLocalizedString(@"Popular", @"")],
[NSString stringWithString:NSLocalizedString(@"My", @"")],
nil]];

segmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;
segmentedControl.tintColor = [UIColor clearColor];

[segmentedControl setSelectedSegmentIndex:0];


[segmentedControl addTarget:self action:@selector(changeSegment:) 
               forControlEvents:UIControlEventValueChanged];

[segmentedControl setFrame:[self.navigationController.toolbar bounds]];

[self.navigationController.toolbar addSubview:segmentedControl];

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导航条的延伸。（对不起，没有回答彼得的问题。）

在Xcode中，File-New-Swift File-Name类

import UIKit
import Foundation


extension UINavigationController
{
    func makeBlackNavigationbar (){

        print("black navigation")

        navigationController?.navigationBarHidden = false
    }
}

extension UINavigationBar
{

func makeBlackNavigationBar ()
    {
        barTintColor = UIColor.blackColor()
        let titleDict: NSDictionary = [NSForegroundColorAttributeName: UIColor.whiteColor()]
        titleTextAttributes = titleDict as [NSObject : AnyObject]
    }
}

它可以在项目的任何地方实现

self.navigationController?.makeBlackNavigationbar()
self.navigationController?.navigationBar.makeBlackNavigationBar()

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这适用于Swift 4 func makeBlackNavigationBar（）{barTintColor=UIColor.black let titleDict:NSDictionary=[NSAttributedString.Key.foregroundColor:UIColor.marine]titlextAttributes=titleDict as[NSObject:AnyObject]as？[NSAttributedString.Key:Any]}