点击一个textView里的link导航至程序内可返回的自定义webView

1,在AppDelegate.h里定义一个

id currentViewController;

在AppDelegate.m里

@implementation UIApplication (Private)

- (BOOL)customOpenURL:(NSURL*)url

{

beautyAppDelegate *MyWatcher = [[UIApplication sharedApplication] delegate];

if (MyWatcher.currentViewController) {

[MyWatcher.currentViewController handleURL:url];

return YES;

}

return NO;

}

@end

- (void)applicationDidBecomeActive:(UIApplication *)application {

Method customOpenUrl = class_getInstanceMethod([UIApplication class],@selector(customOpenURL:));

Method openUrl = class_getInstanceMethod([UIApplication class], @selector(openURL:));

method_exchangeImplementations(openUrl, customOpenUrl);

}

在某个viewController里 AppDelegate.currentViewController = self;

在viewController里定义一个 -(void)handleURL:(NSURL*)url,在这个函数里加载一个自定义的webView;

当viewController里有某个链接url用户点击时就会回调AppDelegate的- (BOOL)customOpenURL:(NSURL*)url;

自定义的webView代码如下:

WebViewController.h里

#import <UIKit/UIKit.h>

@interface WebViewController : UIViewController <UIActionSheetDelegate, UIWebViewDelegate> {

UIWebView *webView;

NSURL *url;

UIToolbar* toolbar;

UIBarButtonItem *backButton;

UIBarButtonItem *forwardButton;

UIBarButtonItem *actionButton;

}

@property (nonatomic, retain) UIWebView *webView;

@property (nonatomic, retain) NSURL *url;

@property (nonatomic, retain) UIToolbar* toolbar;

@property (nonatomic, retain) UIBarButtonItem *backButton;

@property (nonatomic, retain) UIBarButtonItem *forwardButton;

@property (nonatomic, retain) UIBarButtonItem *actionButton;

- (id) initWithURL:(NSURL*)u;

- (void) doAction;

- (void)goBack;

- (void)goForward;

- (void)reload;

- (void)stop;

@end

WebViewController.m里:

#import <objc/runtime.h>

#import "beautyAppDelegate.h"

#import "WebViewController.h"

typedef enum {

BUTTON_RELOAD,

BUTTON_STOP,

} ToolbarButton;

@interface WebViewController (Private)

- (void)updateToolbar:(ToolbarButton)state;

@end;

@implementation WebViewController

@synthesize webView;

@synthesize url;

@synthesize toolbar, backButton, forwardButton, actionButton;

- (id) initWithURL:(NSURL *)u

{

if ( (self = [super init]) )

{

backButton    = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"back.png"]style:UIBarButtonItemStylePlain target:self action:@selector(goBack)];

forwardButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"forward.png"]style:UIBarButtonItemStylePlain target:self action:@selector(goForward)];

actionButton  = [[UIBarButtonItemalloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:selfaction:@selector(doAction)];

toolbar           = [UIToolbar new];

toolbar.barStyle  = UIBarStyleDefault;

toolbar.tintColor = [UIColor lightGrayColor];

[toolbar sizeToFit];

CGFloat toolbarHeight = [toolbar frame].size.height;

CGRect mainViewBounds = self.view.bounds;

[toolbar setFrame:CGRectMake(CGRectGetMinX(mainViewBounds),

CGRectGetMinY(mainViewBounds) + CGRectGetHeight(mainViewBounds) - (toolbarHeight * 2.0) + 2.0,

CGRectGetWidth(mainViewBounds),

toolbarHeight)];

webView                 = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 320, 380)];

webView.delegate        = self;

webView.scalesPageToFit = YES;

url = [u copy];

[self.view addSubview:webView];

[self.view addSubview:toolbar];

UIBarButtonItem *flexItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];

NSArray *items = [NSArray arrayWithObjects: flexItem, backButton, flexItem, flexItem, flexItem,forwardButton,

flexItem, flexItem, flexItem, flexItem, flexItem, flexItem,

actionButton, flexItem, flexItem, flexItem,actionButton, flexItem, nil];

[self.toolbar setItems:items animated:NO];

[webView loadRequest:[NSURLRequest requestWithURL:url]];

}

return self;

}

- (void)viewDidAppear:(BOOL)animated

{

[super viewDidAppear:animated];

}

- (void)viewWillDisappear:(BOOL)animated

{

[webView stopLoading];

[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;

}

#pragma mark -

#pragma mark WebViewActions

- (void)reload

{

[webView reload];

[self updateToolbar:BUTTON_STOP];

}

- (void)stop

{

[webView stopLoading];

[self updateToolbar:BUTTON_RELOAD];

}

- (void) goBack

{

[webView goBack];

}

- (void) goForward

{

[webView goForward];

}

- (void) doAction

{

UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:[self.url absoluteString]

delegate:self

cancelButtonTitle:@"Cancel"

destructiveButtonTitle:nil

otherButtonTitles:@"Open with Safari", nil];

[actionSheet showInView:self.navigationController.view];

[actionSheet release];

}

- (void)actionSheet:(UIActionSheet *)as clickedButtonAtIndex:(NSInteger)buttonIndex

{

if (as.cancelButtonIndex == buttonIndex) return;

if (buttonIndex == 0) {

// swizzle methods, from here we want to open Safari

Method customOpenUrl = class_getInstanceMethod([UIApplication class],@selector(customOpenURL:));

Method openUrl = class_getInstanceMethod([UIApplication class], @selector(openURL:));

method_exchangeImplementations(customOpenUrl, openUrl);

[[UIApplication sharedApplication] openURL:self.url];

}

}

#pragma mark -

#pragma mark UIWebView

- (BOOL)webView:(UIWebView *)aWebView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType

{

return true;

}

- (void)webViewDidStartLoad:(UIWebView *)aWebView

{

[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;

[self updateToolbar:BUTTON_STOP];

}

- (void)webViewDidFinishLoad:(UIWebView *)aWebView

{

[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;

self.title = [aWebView stringByEvaluatingJavaScriptFromString:@"document.title"];

[self updateToolbar:BUTTON_RELOAD];

self.url = aWebView.request.mainDocumentURL;

}

- (void)webView:(UIWebView *)aWebView didFailLoadWithError:(NSError *)error

{

[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;

}

-(void)updateToolbar:(ToolbarButton)button

{

NSMutableArray *items = [toolbar.items mutableCopy];

UIBarButtonItem *newItem;

if (button == BUTTON_STOP) {

UIActivityIndicatorView *activityView = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];

[activityView startAnimating];

newItem = [[UIBarButtonItem alloc] initWithCustomView:activityView];

[activityView release];

}

else {

newItem = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemRefreshtarget:self action:@selector(reload)] autorelease];

}

[items replaceObjectAtIndex:12 withObject:newItem];

[toolbar setItems:items animated:false];

[items release];

// workaround to change toolbar state

backButton.enabled = true;

forwardButton.enabled = true;

backButton.enabled = false;

forwardButton.enabled = false;

backButton.enabled = (webView.canGoBack) ? true : false;

forwardButton.enabled = (webView.canGoForward) ? true : false;

}

#pragma mark -

- (void)dealloc

{

[webView release];

[url release];

[toolbar release];

[backButton release];

[forwardButton release];

[actionButton release];

[super dealloc];

}

@end

本文转载至 http://blog.csdn.net/zhuangyou123/article/details/6936850