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
