iOS webView长按保存图片

#import <Photos/Photos.h>

 

 

遵守代理:UIGestureRecognizerDelegate

 

在webView的懒加载里加上以下代码

WKWebViewConfiguration *configuration = [[WKWebViewConfiguration alloc] init];

WKUserContentController *userController = [[WKUserContentController alloc] init];

configuration.userContentController = userController;

//禁止长按逻辑

NSMutableString *javascript = [NSMutableString string];

[javascript appendString:@"document.documentElement.style.webkitTouchCallout='none';"];//禁止长按

WKUserScript *noneSelectScript = [[WKUserScript alloc] initWithSource:javascript injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];

[configuration.userContentController addUserScript:noneSelectScript];

        

 

// 实现长按事件的方法

-(void)addLongPressGesture

{

    //添加手势前把3d Touch的移除掉，不然有些机型因为3D Touch不能长按保存

    for (UIView* subview in self.webView.scrollView.subviews) {

        if ([subview isKindOfClass:NSClassFromString(@"WKContentView")]) {

            for (UIGestureRecognizer* longPress in subview.gestureRecognizers) {

                if ([longPress isKindOfClass:UILongPressGestureRecognizer.class]) {

                    [subview removeGestureRecognizer:longPress];

                }

            }

        }

    }

 

    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(startLongPress:)];

    longPress.delegate = self;

 

    longPress.minimumPressDuration = 0.4f;

    longPress.numberOfTouchesRequired = 1;

    longPress.cancelsTouchesInView = YES;

    [self.webView addGestureRecognizer:longPress];

    

}

 

- (void)startLongPress:(UILongPressGestureRecognizer *)pressSender

{

    if(pressSender.state == UIGestureRecognizerStateBegan){

 

       //实现相关功能

        [self detectInWebView:pressSender];

//        DebugLog(@"1. 开始长按手势");

 

    }else if(pressSender.state == UIGestureRecognizerStateEnded){

 

        //可以添加你长按手势执行的方法,不过是在手指松开后执行

//        DebugLog(@"2. 结束长按手势");

 

    }else if(pressSender.state == UIGestureRecognizerStateChanged){

 

        //在手指点下去一直不松开的状态执行

//        DebugLog(@"3. 长按手势改变");

    }

}

 

 

- (void)viewDidLoad {

   [super viewDidLoad];

   [self addLongPressGesture];

}

    

 

- (void)detectInWebView:(UIGestureRecognizer *)ges{

 

    CGPoint touchPoint = [ges locationInView:ges.view];

    NSString *jsString = [NSString stringWithFormat:@"function getURLandRect(){\

                              var ele=document.elementFromPoint(%f, %f);\

                              var url=ele.src;\

                              var jsonString= `{\"url\":\"${url}\"}`;\

                              return(jsonString)} getURLandRect()", touchPoint.x, touchPoint.y];

    [self.webView evaluateJavaScript:jsString completionHandler:^(id _Nullable result, NSError * _Nullable error) {

        NSData *data = [result dataUsingEncoding:NSUTF8StringEncoding];

        NSDictionary*resultDic = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];

        NSString* imageURL = resultDic[@"url"];

        if(imageURL.length==0|| [imageURL isEqualToString:@"undefined"]) {

            return;

        }

        NSData* imageData=nil;

        if(([imageURL hasPrefix:@"http"])) {

            imageData = [NSURLConnection sendSynchronousRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:imageURL]] returningResponse:NULL error:NULL];

            

        }else{

            NSString*dataString = [[imageURL componentsSeparatedByString:@","]lastObject];

//            imageData = [dataString dataUsingEncoding:NSUTF8StringEncoding];

            imageData = [[NSData alloc] initWithBase64EncodedString:dataString options:NSDataBase64DecodingIgnoreUnknownCharacters];

            

        }

        UIImage*image=[UIImage imageWithData:imageData];

        if(image) {

            __weak typeof(self) weakSelf = self;

            [TBNOAlertView showAlertView:@"提示" msg:@"保存到相册" sureTitle:@"保存" canTitle:@"取消" sureBlock:^{

                //判断相册权限

                PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];

                if (status == PHAuthorizationStatusRestricted ||

                    status == PHAuthorizationStatusDenied) {

                    [InstanceTool permissionToRemindWithRemindTitle:@"请在ipone的“设置－隐私－相册”选项中,允许访问你的相册" remindType:IAPermissionToRemindTypePhoto];

                    return;

                }

    

                __strong typeof(weakSelf) strongSelf = weakSelf;

                [strongSelf loadImageFinished:image];

            } cancelBlock:^{

                

            }];

        }

    }];

}

 

- (void)loadImageFinished:(UIImage *)image {

    [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{

            

//         /写入图片到相册

         PHAssetChangeRequest *req = [PHAssetChangeRequest creationRequestForAssetFromImage:image];

            

            

     } completionHandler:^(BOOL success, NSError * _Nullable error) {

            

         NSLog(@"success = %d, error = %@", success, error);

         if(success) {

             [TBNOAlertView showAlertView:@"提示" msg:@"保存成功！" sureTitle:@"" canTitle:@"确定" sureBlock:^{

                 

             } cancelBlock:^{

                 

             }];

         }

    }];

 

}