Swift擴展navigationBar高度並添加segmentControl

Question

我設計了以下UINavigationBar，但是我有點困惑，是否有可能像下面這樣添加segmentControl？什麼是最好的方式來實現這樣的？

Answer 1

擴展。 （對不起，不回答彼得的問題。）

在Xcode中，File - New - Swift File - 命名類。

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] 
    } 
} 

它可以在項目的任何地方實施。

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

Answer 2

如下您可以模仿你的要求：

-(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; 
} 

或有另一種方法如下：UInavigation吧

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];