Swift扩展navigationBar高度并添加segmentControl

Question

我是按照UINavigationBar设计的，但我是否有可能添加如下所示的segmentControl？实现这一目标的最佳途径是什么？

Answer 1

您可以按如下方式模仿您的要求：

-(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;
}

或者有另一种方法如下：

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];