Hi,
I'm currently working in a test project trying to figure out how to implement a custom context menu for a UIWebView. That way I can have menu items that say for example, "open in a new tab", or "save image".
I've been following this tutorial: http://www.icab.de/blog/2010/07/11/customize-the-contextual-menu-of-uiwebview/
However, after having followed the instructions, nothing happens. I'm sure I've made some mistake somewhere, but I've no idea what it is. I'll post the relevant code below:
AppDelegate.h
(This previously said UIWindow instead of MyWindow.)
ViewController.m
None of the methods I've added to ViewController.m from the tutorial work at all. An exception to webViewDidFinishLoad which runs as expected. I used break points to determine that they don't load after I tap and hold on a link at Apple.com. Also, the app compiles without error or warning.
You can find the contents of MyWindow.h/m at the tutorial. I haven't changed any of it, although I did add break points to see if any code in .h/m runs, which it doesn't.
Does anyone have any idea of my mistake? Any help would be appreciated! Thanks.
I'm currently working in a test project trying to figure out how to implement a custom context menu for a UIWebView. That way I can have menu items that say for example, "open in a new tab", or "save image".
I've been following this tutorial: http://www.icab.de/blog/2010/07/11/customize-the-contextual-menu-of-uiwebview/
However, after having followed the instructions, nothing happens. I'm sure I've made some mistake somewhere, but I've no idea what it is. I'll post the relevant code below:
AppDelegate.h
Code:
#import <UIKit/UIKit.h>
#import "MyWindow.h"
@interface AppDelegate : UIResponder <UIApplicationDelegate>
@property (strong, nonatomic) MyWindow *window;
@endViewController.m
Code:
#import "ViewController.h"
#include "WebViewAdditions.h"
@implementation ViewController
@synthesize myWebView;
#pragma mark - View lifecycle
- (void)viewDidLoad
{
[super viewDidLoad];
myWebView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 320, 460)];
myWebView.scalesPageToFit = YES;
myWebView.delegate = self;
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(contextualMenuAction:) name:@"TapAndHoldNotification" object:nil];
NSURL *url = [[NSURL alloc] initWithString:@"http://www.apple.com"];
NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
[myWebView loadRequest:request];
[self.view addSubview:myWebView];
}
- (void)contextualMenuAction:(NSNotification*)notification
{
CGPoint pt;
NSDictionary *coord = [notification object];
pt.x = [[coord objectForKey:@"x"] floatValue];
pt.y = [[coord objectForKey:@"y"] floatValue];
// convert point from window to view coordinate system
pt = [myWebView convertPoint:pt fromView:nil];
// convert point from view to HTML coordinate system
CGPoint offset = [myWebView scrollOffset];
CGSize viewSize = [myWebView frame].size;
CGSize windowSize = [myWebView windowSize];
CGFloat f = windowSize.width / viewSize.width;
pt.x = pt.x * f + offset.x;
pt.y = pt.y * f + offset.y;
[self openContextualMenuAt:pt];
}
- (void)openContextualMenuAt:(CGPoint)pt
{
// Load the JavaScript code from the Resources and inject it into the web page
NSString *path = [[NSBundle mainBundle] pathForResource:@"JSTools" ofType:@"js"];
NSString *jsCode = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
[myWebView stringByEvaluatingJavaScriptFromString: jsCode];
// get the Tags at the touch location
NSString *tags = [myWebView stringByEvaluatingJavaScriptFromString:
[NSString stringWithFormat:@"MyAppGetHTMLElementsAtPoint(%i,%i);",(NSInteger)pt.x,(NSInteger)pt.y]];
// create the UIActionSheet and populate it with buttons related to the tags
UIActionSheet *sheet = [[UIActionSheet alloc] initWithTitle:@"Contextual Menu" delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:nil otherButtonTitles:nil];
// If a link was touched, add link-related buttons
if ([tags rangeOfString:@",A,"].location != NSNotFound) {
[sheet addButtonWithTitle:@"Open Link"];
[sheet addButtonWithTitle:@"Open Link in Tab"];
[sheet addButtonWithTitle:@"Download Link"];
}
// If an image was touched, add image-related buttons
if ([tags rangeOfString:@",IMG,"].location != NSNotFound) {
[sheet addButtonWithTitle:@"Save Picture"];
}
// Add buttons which should be always available
[sheet addButtonWithTitle:@"Save Page as Bookmark"];
[sheet addButtonWithTitle:@"Open Page in Safari"];
[sheet showInView:myWebView];
}
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
[webView stringByEvaluatingJavaScriptFromString:@"document.body.style.webkitTouchCallout='none';"];
}None of the methods I've added to ViewController.m from the tutorial work at all. An exception to webViewDidFinishLoad which runs as expected. I used break points to determine that they don't load after I tap and hold on a link at Apple.com. Also, the app compiles without error or warning.
You can find the contents of MyWindow.h/m at the tutorial. I haven't changed any of it, although I did add break points to see if any code in .h/m runs, which it doesn't.
Does anyone have any idea of my mistake? Any help would be appreciated! Thanks.