pagefourviewcontroller.m

一个navigation view的xcode手机程序

//
// File:	   PageFourViewController.m
//
// Abstract:   The view controller for page four of this sample.
//
// Version:    1.7
//
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//             installation, modification or redistribution of this Apple software
//             constitutes acceptance of these terms.  If you do not agree with these
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//             software.
//
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//             Software may be incorporated.
//
//             The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO
//             WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
//             WARRANTIES OF NON - INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A
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// Copyright (C) 2008 Apple Inc. All Rights Reserved.
//

#import "PageFourViewController.h"
#import "Constants.h"

@implementation PageFourViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
	self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
	if (self)
	{
		// this will appear as the title in the navigation bar
		self.title = NSLocalizedString(@"PageFourTitle", @"");
	}
	
	return self;
}

- (void)dealloc
{
	[defaultTintColor release];
	[super dealloc];
}

// Automatically invoked after -loadView
// This is the preferred override point for doing additional setup after -initWithNibName:bundle:
//
- (void)viewDidLoad
{
	// segmented control as the custom title view
	NSArray *segmentTextContent = [NSArray arrayWithObjects:
										NSLocalizedString(@"Image", @""),
										NSLocalizedString(@"Text", @""),
										NSLocalizedString(@"Video", @""),
										nil];
	UISegmentedControl* segmentedControl = [[UISegmentedControl alloc] initWithItems:segmentTextContent];
	segmentedControl.selectedSegmentIndex = 0;
	segmentedControl.autoresizingMask = UIViewAutoresizingFlexibleWidth;
	segmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;
	segmentedControl.frame = CGRectMake(0, 0, 400, kCustomButtonHeight);
	[segmentedControl addTarget:self action:@selector(segmentAction:) forControlEvents:UIControlEventValueChanged];
	
	defaultTintColor = [segmentedControl.tintColor retain];	// keep track of this for later

	self.navigationItem.titleView = segmentedControl;
	[segmentedControl release];
}

- (void)segmentAction:(id)sender
{
	UISegmentedControl* segCtl = sender;
	// the segmented control was clicked, handle it here 
	NSLog(@"segment clicked %d", [segCtl selectedSegmentIndex]);
}

- (void)viewWillAppear:(BOOL)animated
{
	UISegmentedControl *segmentedControl = (UISegmentedControl *)self.navigationItem.titleView;
	
	// before we show this view make sure the segmentedControl matches the nav bar style
	if (self.navigationController.navigationBar.barStyle == UIBarStyleBlackTranslucent ||
		self.navigationController.navigationBar.barStyle == UIBarStyleBlackOpaque) 
	{
		segmentedControl.tintColor = [UIColor darkGrayColor];
	}
	else
	{
		segmentedControl.tintColor = defaultTintColor;
	}
}

@end