pagethreeviewcontroller.m

一个navigation view的xcode手机程序

//
// File:	   PageThreeViewController.m
//
// Abstract:   The view controller for page three of this sample.
//
// Version:    1.7
//
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//             software.
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//
//             The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO
//             WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
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// Copyright (C) 2008 Apple Inc. All Rights Reserved.
//

#import "PageThreeViewController.h"
#import "Constants.h"

@implementation PageThreeViewController

- (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(@"PageThreeTitle", @"");
	}
	
	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 to the right
	UISegmentedControl *segmentedControl = [[[UISegmentedControl alloc] initWithItems:
												[NSArray arrayWithObjects:
													[UIImage imageNamed:@"up.png"],
													[UIImage imageNamed:@"down.png"],
													nil]] autorelease];
	[segmentedControl addTarget:self action:@selector(segmentAction:) forControlEvents:UIControlEventValueChanged];
	segmentedControl.frame = CGRectMake(0, 0, 90, kCustomButtonHeight);
	segmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;
	segmentedControl.momentary = YES;
	
	defaultTintColor = [segmentedControl.tintColor retain];	// keep track of this for later
	
	UIBarButtonItem *segmentBarItem = [[[UIBarButtonItem alloc] initWithCustomView:segmentedControl] autorelease];
	self.navigationItem.rightBarButtonItem = segmentBarItem;
}

- (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.rightBarButtonItem.customView;
	
	// 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