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Matthias Plappert
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‎Classes/PWWebViewController.h

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//
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// PWWebViewController.h
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// PWWebViewController
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//
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// Created by Matthias Plappert on 24.10.09.
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// Copyright 2009 phapswebsolutions. All rights reserved.
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//
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#import <UIKit/UIKit.h>
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#import <MessageUI/MessageUI.h>
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// You can use this to identify a action sheet tag that was created by PWWebViewController
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#define kPWWebViewControllerActionSheetTag 5000
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// The index of the mail action
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#define kPWWebViewControllerActionSheetMailIndex 1
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// The index of the open in safari action
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#define kPWWebViewControllerActionSheetSafariIndex 0
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@interface PWWebViewController : UIViewController <UIWebViewDelegate, UIActionSheetDelegate, MFMailComposeViewControllerDelegate> {
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// The web view
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UIWebView *_webView;
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// Toolbar and used buttons
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UIToolbar *_toolbar;
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UIBarButtonItem *_actionButton;
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UIBarButtonItem *_reloadButton;
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UIBarButtonItem *_loadingButton;
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UIBarButtonItem *_forwardButton;
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UIBarButtonItem *_backButton;
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UIBarButtonItem *_flexibleSpace;
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/* This is used to store the request if the view is loaded.
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Important if view was released because of low memory conditions */
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NSURLRequest *_request;
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}
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/* Readonly property to access the UIWebView.
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However, you should use this only to retreive values from the web view */
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@property (nonatomic, readonly) UIWebView *webView;
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// Use this method to init the web view controller
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- (id)initWithRequest:(NSURLRequest *)request;
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// Shows all available actions in a UIActionSheet that can be performed on the current page
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- (void)showAvailableActions;
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// Reloads the current website
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- (void)reload;
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// Go one site back, if available
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- (void)goBack;
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// Go on site forward, if available
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- (void)goForward;
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@end

‎Classes/PWWebViewController.m

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//
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// PWWebViewController.m
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// PWWebViewController
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//
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// Created by Matthias Plappert on 24.10.09.
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// Copyright 2009 phapswebsolutions. All rights reserved.
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//
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#import "PWWebViewController.h"
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@interface PWWebViewController (Private)
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// This is used internally to check if the forward/back buttons are enabled
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- (void)checkNavigationStatus;
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@end
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@implementation PWWebViewController
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- (id)initWithRequest:(NSURLRequest *)request
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{
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if (self = [super init]) {
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_request = [request retain];
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self.hidesBottomBarWhenPushed = YES;
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}
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return self;
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}
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- (void)loadView
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{
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// Get frames
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CGRect screenRect = self.navigationController.view.frame;
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CGRect navigationBarFrame = self.navigationController.navigationBar.frame;
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// Get status bar frame. Check if it is not zero and than make width + height 20.0. Seems like a bug in iPhone OS
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CGRect statusRect = [UIApplication sharedApplication].statusBarFrame;
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if (statusRect.size.width != 0.0 && statusRect.size.height != 0.0) {
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statusRect.size.width = statusRect.size.height = 20.0;
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}
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// Create final view rect
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CGRect frame = CGRectMake(0.0, 0.0, screenRect.size.width, screenRect.size.height - statusRect.size.height - navigationBarFrame.size.height);
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// Simple background view
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UIView *view = [[UIView alloc] initWithFrame:frame];
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self.view = view;
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[view release];
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// Load web view
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_webView = [[UIWebView alloc] initWithFrame:CGRectMake(frame.origin.x, frame.origin.y, frame.size.width, frame.size.height - navigationBarFrame.size.height)];
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_webView.delegate = self;
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_webView.scalesPageToFit = YES;
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_webView.autoresizingMask = (UIViewAutoresizingFlexibleLeftMargin |
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UIViewAutoresizingFlexibleWidth |
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UIViewAutoresizingFlexibleRightMargin |
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UIViewAutoresizingFlexibleTopMargin |
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UIViewAutoresizingFlexibleHeight |
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UIViewAutoresizingFlexibleBottomMargin);
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[self.view addSubview:_webView];
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// Load content of web view
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[_webView loadRequest:_request];
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// Create action button. This shows a selection of available actions in context of the displayed page
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_actionButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction
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target:self
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action:@selector(showAvailableActions)];
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// Create reload button to reload the current page
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_reloadButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh
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target:self
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action:@selector(reload)];
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// Create loading button that is displayed if the web view is loading anything
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UIActivityIndicatorView *activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
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[activityView startAnimating];
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_loadingButton = [[UIBarButtonItem alloc] initWithCustomView:activityView];
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[activityView release];
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// Shows the next page, is disabled by default. Web view checks if it can go forward and disables the button if neccessary
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_forwardButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"PWWebViewControllerArrowRight.png"] style:UIBarButtonItemStylePlain
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target:self
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action:@selector(goForward)];
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_forwardButton.enabled = NO;
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// Shows the last page, is disabled by default. Web view checks if it can go back and disables the button if neccessary
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_backButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"PWWebViewControllerArrowLeft.png"] style:UIBarButtonItemStylePlain
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target:self
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action:@selector(goBack)];
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_backButton.enabled = NO;
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// Create toolbar
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_toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(frame.origin.x, frame.origin.y + frame.size.height - navigationBarFrame.size.height, frame.size.width, navigationBarFrame.size.height)];
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_toolbar.autoresizingMask = (UIViewAutoresizingFlexibleLeftMargin |
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UIViewAutoresizingFlexibleWidth |
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UIViewAutoresizingFlexibleRightMargin |
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UIViewAutoresizingFlexibleTopMargin |
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UIViewAutoresizingFlexibleHeight |
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UIViewAutoresizingFlexibleBottomMargin);
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[self.view addSubview:_toolbar];
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// Flexible space
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_flexibleSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:NULL];
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// Assign buttons to toolbar
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_toolbar.items = [NSArray arrayWithObjects:_actionButton, _flexibleSpace, _backButton, _flexibleSpace, _forwardButton, _flexibleSpace, _reloadButton, nil];
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}
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- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
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{
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return (interfaceOrientation == UIInterfaceOrientationPortrait ||
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interfaceOrientation == UIInterfaceOrientationLandscapeLeft ||
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interfaceOrientation == UIInterfaceOrientationLandscapeRight);
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}
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- (void)viewDidUnload
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{
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// Save last request
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[_request release];
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_request = [_webView.request retain];
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[_webView release];
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_webView = nil;
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[_actionButton release];
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_actionButton = nil;
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[_reloadButton release];
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_reloadButton = nil;
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[_loadingButton release];
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_loadingButton = nil;
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[_forwardButton release];
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_forwardButton = nil;
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[_backButton release];
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_backButton = nil;
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[_flexibleSpace release];
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_flexibleSpace = nil;
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}
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- (void)dealloc
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{
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[_webView release];
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[_request release];
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[_toolbar release];
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[_actionButton release];
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[_reloadButton release];
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[_loadingButton release];
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[_forwardButton release];
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[_backButton release];
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[_flexibleSpace release];
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[super dealloc];
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}
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#pragma mark -
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#pragma mark Accessors
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- (UIWebView *)webView
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{
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return _webView;
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}
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#pragma mark -
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#pragma mark Button actions
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- (void)showAvailableActions
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{
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// Create action sheet without any buttons
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UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:[self.webView.request.URL absoluteString]
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delegate:self
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cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:nil];
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// Add buttons
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[actionSheet addButtonWithTitle:NSLocalizedString(@"Open in Safari", nil)];
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if ([MFMailComposeViewController canSendMail]) {
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// The iPhone/iPod touch is ready to send mails. If it is not, do not add the mail link button
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[actionSheet addButtonWithTitle:NSLocalizedString(@"Mail Link", nil)];
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}
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// Add cancel button and mark is as cancel button
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[actionSheet addButtonWithTitle:NSLocalizedString(@"Cancel", nil)];
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actionSheet.cancelButtonIndex = actionSheet.numberOfButtons - 1;
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// Assign tag, show it from toolbar and release it
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actionSheet.tag = kPWWebViewControllerActionSheetTag;
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[actionSheet showFromToolbar:_toolbar];
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[actionSheet release];
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}
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- (void)reload
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{
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[self.webView reload];
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}
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- (void)goBack
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{
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if (self.webView.canGoBack == YES) {
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// We can go back. So make the web view load the previous page.
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[self.webView goBack];
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// Check the status of the forward/back buttons
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[self checkNavigationStatus];
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}
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}
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- (void)goForward
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{
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if (self.webView.canGoForward == YES) {
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// We can go forward. So make the web view load the next page.
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[self.webView goForward];
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// Check the status of the forward/back buttons
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[self checkNavigationStatus];
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}
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}
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#pragma mark -
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#pragma mark UIWebViewDelegate
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- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
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{
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return YES;
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}
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- (void)webViewDidStartLoad:(UIWebView *)webView
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{
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// Change toolbar items
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_toolbar.items = [NSArray arrayWithObjects:_actionButton, _flexibleSpace, _backButton, _flexibleSpace, _forwardButton, _flexibleSpace, _loadingButton, nil];
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// Set title
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self.title = NSLocalizedString(@"Loading...", nil);
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}
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- (void)webViewDidFinishLoad:(UIWebView *)webView
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{
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// Change toolbar items
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_toolbar.items = [NSArray arrayWithObjects:_actionButton, _flexibleSpace, _backButton, _flexibleSpace, _forwardButton, _flexibleSpace, _reloadButton, nil];
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// Set title
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NSString *title = [webView stringByEvaluatingJavaScriptFromString:@"document.title"];
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self.title = title;
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// Check if forward/back buttons are available
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[self checkNavigationStatus];
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}
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- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
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{
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// Change toolbar items
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_toolbar.items = [NSArray arrayWithObjects:_actionButton, _flexibleSpace, _backButton, _flexibleSpace, _forwardButton, _flexibleSpace, _reloadButton, nil];
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// Check if forward/back buttons are available
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[self checkNavigationStatus];
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// Set title
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self.title = NSLocalizedString(@"Page not found", nil);
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// Display an alert view that tells the userr what went wrong.
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UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Connection did fail", nil)
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message:[error localizedDescription]
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delegate:nil
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cancelButtonTitle:NSLocalizedString(@"OK", nil)
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otherButtonTitles:nil];
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[alertView show];
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[alertView release];
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}
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#pragma mark -
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#pragma mark UIActionSheetDelegate
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- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
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{
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if (actionSheet.tag == kPWWebViewControllerActionSheetTag && buttonIndex != actionSheet.cancelButtonIndex) {
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// It is one of your action sheets and it was not canceled
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if (buttonIndex == kPWWebViewControllerActionSheetSafariIndex) {
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// Open URL in Safari
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[[UIApplication sharedApplication] openURL:self.webView.request.URL];
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} else if (buttonIndex == kPWWebViewControllerActionSheetMailIndex) {
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// Mail URL
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MFMailComposeViewController *controller = [[MFMailComposeViewController alloc] init];
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[controller setMessageBody:[self.webView.request.URL absoluteString] isHTML:NO];
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controller.mailComposeDelegate = self;
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[self presentModalViewController:controller animated:YES];
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[controller release];
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}
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}
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}
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#pragma mark -
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#pragma mark MFMailComposeViewControllerDelegate
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- (void)mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error
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{
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if (result == MFMailComposeResultFailed && error != nil) {
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// There was an error. Display an alert view.
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UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Sending failed", nil)
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message:[error localizedDescription]
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delegate:nil
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cancelButtonTitle:NSLocalizedString(@"OK", nil)
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otherButtonTitles:nil];
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[alertView show];
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[alertView release];
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}
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// Hide controller
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[controller dismissModalViewControllerAnimated:YES];
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}
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#pragma mark -
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#pragma mark Private methods
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- (void)checkNavigationStatus
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{
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// Check if we can go forward or back
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_backButton.enabled = self.webView.canGoBack;
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_forwardButton.enabled = self.webView.canGoForward;
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}
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@end

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