UIWebView长按图片生成封存菜单

UIWebView长按图片生成保存菜单
UIWebView长按图片生成保存菜单
参考：
http://www.icab.de/blog/2010/07/11/customize-the-contextual-menu-of-uiwebview/
http://www.icab.de/blog/2011/10/17/elementfrompoint-under-ios-5/comment-page-1/#comment-30184

自定义UILongPressGestureRecognizer
创建 UnpreventableUILongPressGestureRecognizer.h

#import <Foundation/Foundation.h>@interface UnpreventableUILongPressGestureRecognizer : UILongPressGestureRecognizer {}@end

UnpreventableUILongPressGestureRecognizer.m

#import "UnpreventableUILongPressGestureRecognizer.h" @implementation UnpreventableUILongPressGestureRecognizer- (BOOL)canBePreventedByGestureRecognizer:(UIGestureRecognizer *)preventedGestureRecognizer {    return NO;}@end

UIWebview页面给webview添加手势 ViewController.m：

UnpreventableUILongPressGestureRecognizer *longPressRecognizer = [[UnpreventableUILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)];longPressRecognizer.allowableMovement = 20;longPressRecognizer.minimumPressDuration = 1.0f;[webview addGestureRecognizer:longPressRecognizer];

ViewController.m 处理手势：

-(void)handleLongPress:(UILongPressGestureRecognizer *)gestureRecognizer{    if (gestureRecognizer.state == UIGestureRecognizerStateBegan) {                 CGPoint pt = [gestureRecognizer locationInView:self.webview];                 // convert point from view to HTML coordinate system        // ?? ??? ??? HTML ???? ????.        CGSize viewSize = [webview frame].size;        CGSize windowSize = [webview windowSize];        CGFloat f = windowSize.width / viewSize.width;         if ([[[UIDevice currentDevice] systemVersion] doubleValue] >= 5.0) {            pt.x = pt.x * f;            pt.y = pt.y * f;        } else {            // On iOS 4 and previous, document.elementFromPoint is not taking            // offset into account, we have to handle it            CGPoint offset = [webview scrollOffset];            pt.x = pt.x * f + offset.x;            pt.y = pt.y * f + offset.y;        }                 [self openContextualMenuAt:pt];    }}

创建分类 WebViewAdditions.h

#import <foundation foundation.h="">@interface UIWebView(WebViewAdditions)- (CGSize)windowSize;- (CGPoint)scrollOffset;@end</foundation>

WebViewAdditions.m

#import "WebViewAdditions.h" @implementation UIWebView(WebViewAdditions) - (CGSize)windowSize{    CGSize size;    size.width = [[self stringByEvaluatingJavaScriptFromString:@"window.innerWidth"] integerValue];    size.height = [[self stringByEvaluatingJavaScriptFromString:@"window.innerHeight"] integerValue];    return size;} - (CGPoint)scrollOffset{    CGPoint pt;    pt.x = [[self stringByEvaluatingJavaScriptFromString:@"window.pageXOffset"] integerValue];    pt.y = [[self stringByEvaluatingJavaScriptFromString:@"window.pageYOffset"] integerValue];    return pt;}@end

弹出菜单 ViewController.m

- (void)openContextualMenuAt:(CGPoint)pt{    // Load the JavaScript code from the Resources and inject it into the web page    NSBundle *bundle = [NSBundle bundleWithPath:[[NSBundle mainBundle] pathForResource:@"Naving" ofType:@"bundle"]];    NSString *path = [bundle pathForResource:@"JSTools" ofType:@"js"];    NSString *jsCode = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];    [webview stringByEvaluatingJavaScriptFromString:jsCode];         // get the Tags at the touch location    NSString *tags = [webview stringByEvaluatingJavaScriptFromString:                      [NSString stringWithFormat:@"MyAppGetHTMLElementsAtPoint(%i,%i);",(NSInteger)pt.x,(NSInteger)pt.y]];         NSString *tagsHREF = [webview stringByEvaluatingJavaScriptFromString:                          [NSString stringWithFormat:@"MyAppGetLinkHREFAtPoint(%i,%i);",(NSInteger)pt.x,(NSInteger)pt.y]];         NSString *tagsSRC = [webview stringByEvaluatingJavaScriptFromString:                         [NSString stringWithFormat:@"MyAppGetLinkSRCAtPoint(%i,%i);",(NSInteger)pt.x,(NSInteger)pt.y]];         NSLog(@"tags : %@",tags);    NSLog(@"href : %@",tagsHREF);    NSLog(@"src : %@",tagsSRC);         if (!_actionActionSheet) {        _actionActionSheet = nil;    }    _actionActionSheet = [[UIActionSheet alloc] initWithTitle:nil                                                       delegate:self                                              cancelButtonTitle:nil                                         destructiveButtonTitle:nil                                              otherButtonTitles:nil];         selectedLinkURL = @"";    selectedImageURL = @"";         // If an image was touched, add image-related buttons.    if ([tags rangeOfString:@",IMG,"].location != NSNotFound) {        selectedImageURL = tagsSRC;                 if (_actionActionSheet.title == nil) {            _actionActionSheet.title = tagsSRC;        }                 [_actionActionSheet addButtonWithTitle:@"Save Image"];        [_actionActionSheet addButtonWithTitle:@"Copy Image"];    }    // If a link is pressed add image buttons.    if ([tags rangeOfString:@",A,"].location != NSNotFound){        selectedLinkURL = tagsHREF;                 _actionActionSheet.title = tagsHREF;        [_actionActionSheet addButtonWithTitle:@"Open Link"];        [_actionActionSheet addButtonWithTitle:@"Copy Link"];    }         if (_actionActionSheet.numberOfButtons > 0) {        [_actionActionSheet addButtonWithTitle:@"Cancel"];        _actionActionSheet.cancelButtonIndex = (_actionActionSheet.numberOfButtons-1);                          [_actionActionSheet showInView:webview];    }     }

工具文件 JSTools.js

function MyAppGetHTMLElementsAtPoint(x,y) {    var tags = ",";    var e = document.elementFromPoint(x,y);    while (e) {        if (e.tagName) {            tags += e.tagName + ',';        }        e = e.parentNode;    }    return tags;} function MyAppGetLinkSRCAtPoint(x,y) {    var tags = "";    var e = document.elementFromPoint(x,y);    while (e) {        if (e.src) {            tags += e.src;            break;        }        e = e.parentNode;    }    return tags;} function MyAppGetLinkHREFAtPoint(x,y) {    var tags = "";    var e = document.elementFromPoint(x,y);    while (e) {        if (e.href) {            tags += e.href;            break;        }        e = e.parentNode;    }    return tags;}

ViewController.m 处理ActionSheet事件

#pragma UIActionSheetDelegate-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{    if ([[actionSheet buttonTitleAtIndex:buttonIndex] isEqualToString:@"Open Link"]){        [webview loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:selectedLinkURL]]];    }    else if ([[actionSheet buttonTitleAtIndex:buttonIndex] isEqualToString:@"Copy Link"]){        [[UIPasteboard generalPasteboard] setString:selectedLinkURL];    }    else if ([[actionSheet buttonTitleAtIndex:buttonIndex] isEqualToString:@"Copy Image"]){        [[UIPasteboard generalPasteboard] setString:selectedImageURL];    }    else if ([[actionSheet buttonTitleAtIndex:buttonIndex] isEqualToString:@"Save Image"]){        NSOperationQueue *queue = [NSOperationQueue new];        NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:self                                                                                selector:@selector(saveImageURL:) object:selectedImageURL];        [queue addOperation:operation];        //[operation release];    }} -(void)saveImageURL:(NSString*)url{    [self performSelectorOnMainThread:@selector(showStartSaveAlert)                            withObject:nil                        waitUntilDone:YES];         UIImageWriteToSavedPhotosAlbum([UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:url]]], nil, nil, nil);         [self performSelectorOnMainThread:@selector(showFinishedSaveAlert)                           withObject:nil                        waitUntilDone:YES];}

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