How is it possible to set the an image as background of the WebView in a Mac App? Because the WebView has that "bouncing" effect, if you scroll further down than the content, the background is usually just white. Is it possible to set a Background-image like it is possible for the UIWebView?
EDIT: The alternate way would be to completely deactivate the bouncing-effect of the webView.
If you are creating this webview programically then create an image then create the webview. Make sure their positions (x,y) and sizes (height, width) are the same.
If you are doing this through IB put down an image (litterally just drag an image) then put the webview on top of it.
Here is a way I found that stops the bouncing:
id sub = self.web.subviews[0];
if ([sub isKindOfClass:[WebFrameView class]])
[sub setAllowsScrolling:NO];
The class check may not be needed, but I like to make sure.
We can add background image in WebView using cocoa. to do this we need to add css for body tag.
Create a webview:
WebView *webView;
Fetch image form bundle path:
NSString *path = [[NSBundle mainBundle] pathForResource:#"my-bg" ofType:#"jpg"];
write Css for body tag.
NSMutableString *htmlBuilder = [[NSMutableString alloc] init];
[htmlBuilder appendString:#"body {"];
[htmlBuilder appendString:[NSString stringWithFormat:#" background-image: url('file://%#');",path]];
[htmlBuilder appendString:#"}"];
Load this image on webview
[[webView mainFrame] loadHTMLString:htmlBuilder baseURL:nil];
[webView setDrawsBackground:NO];
Your image will be added in background on webview.
Related
I have a very weird issue. I have a watch app and I am trying to display an image programatically. When I debug the code, I can see the image is correctly loaded but on simulator or real device I cannot see the image. I have added that image in both watch and extension bundle resources.
Firstly I use the code below to open the view.
NSArray *objects =[NSArray arrayWithObjects:#"MainPageView",#"InterfaceController",#"PoseImageView",nil];
[self presentControllerWithNames:objects contexts:nil];
Inside PoseImageView I am trying to display an image with:
UIImage *imgTest = [UIImage imageNamed:[NSString stringWithFormat:#"1.jpg", strAngle]]; // I can see 1.jpg in debugger
[_imgPose setImage: imgTest];
The image is not there on watch or simulator. I am wondering how to fix the issue.
Note: From assets its not loading as well.
Note2: I can only display the image if the view is initial view.
You are trying to use imageNamed for .jpg which will not work.
Try using
NSString *filePath = [[NSBundle mainBundle] pathForResource:[NSString stringWithFormat:#"imageName"] ofType:#"jpg"];
UIImage *theImage = [UIImage imageWithContentsOfFile:filePath];
I am displaying a video to my UIWebView from an online Database as:
//-------- Creating webview --------//
UIWebView *webview=[[UIWebView alloc]initWithFrame:CGRectMake(10, 145, 300,190)];
webview.scalesPageToFit = YES;
webview.backgroundColor = [UIColor redColor];
webview.opaque = NO;
[self.view addSubview:webview];
//-------- Loading Video --------//
NSURL *fileURL = [NSURL URLWithString:
[NSString stringWithFormat:#"http://mysite.org/myProject/sample.php?name=123746"]];
NSURL *nsurl=fileURL;
[webview loadRequest:nsrequest];
It is working great. But the video looks like below:
So, Is there is any way to align the video to center of the web view? Anyone please help. thanks.
3 Options.
If the video will always be that size, make the UIWebView just slightly bigger and center that.
Use [webView stringByEvaluatingJavaScriptFromString:#""] to pass in javascript to adjust the css to center it.
If its a webpage you control, add css to the HTML to center the video div in the window
as I was not able to find any good inbuilt solution using Xcode, I have solved the issue with the help of backend and HTML iframes. I've saved the exact url in a data base and using HTML <iframe>, I loaded the video in the webview with tag to the iframes.
Let's say I have a WebView that loads up twitter.com.
Here's what appears in my WebView:
And here's what I want to show:
How can I change the default Upper Left Corner position of website on the WebView to display another position of the same website?
I get it to move using this (you need to set the frameLoadDelegate):
-(void)webView:(WebView *)sender didFinishLoadForFrame:(WebFrame *)frame
{
if (frame == self.myWebview.mainFrame)
{
DOMDocument *mainDoc = [self.myWebview.mainFrame DOMDocument];
DOMNodeList *list = [mainDoc getElementsByClassName:#"front-signin js-front-signin"];
DOMNode *loginElement = [list item:0];
NSRect myRect = loginElement.boundingBox;
[self.myWebview stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:#"window.scrollTo(%d,%d);", (int)myRect.origin.x, (int)myRect.origin.y]];
}
}
"front-signin js-front-signin" being the name of the class used in the source html of www.twitter.com.
So it is failure prone to rely on that which could change at any time.
There is also in this case the header that doesn't move. So either account for it and display it, or move your view up the size of this header and hide it.
You need to adjust the scrollTo call to center it in your view.
And you might want to consider fading the view once it's loaded, cause the scroll is kind of jerky, and not very osx like.
But apart from this, it could work ;-)
You could execute javascript in the UIWebView:
[webView stringByEvaluatingJavaScriptFromString:#"window.pageYOffset=200;"];
This should scroll the window down 200 pixels.
You can use the following on OS X:
[webView stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:#"window.scrollTo(%f, %f)", xPos, yPos]];
You can also play with the webview's scrollView contentOffset.
UIWebView * webView = [[UIwebView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
[webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:#"http://www.twitter.com"]]];
[webView.scrollView setContentOffset:CGPointMake(50, 60)];
[webView release];
I have an NSBox set up in my main view that accepts drag and drop. We store the URL into str. We then load the image and add it to the content view of NSBox.
imageView = [[NSImageView alloc] initWithFrame:CGRectMake(0, 0, 390, 150)];
NSURL *imageURL = [NSURL URLWithString:str];
NSImage *image = [[NSImage alloc] initByReferencingURL:imageURL];
[imageView setImage:image];
[self setContentView:imageView];
However, this doesn't do anything. The image is not displayed in the nsbox.
Another oddity. At first I was trying to add the NSImageView via interface builder, but the only image container they had was IKImageView... Is this odd? Isn't NSImageView more ubiquitous? I mainly develop on iOS, so I have the version from the ios developer site.
Any thoughts?
Edit: I should also add, when I was using IKImageView in IB, the image would show up.
Edit2: I've also tried just taking the initWithFrame out and replacing it with just init, no go.
The problem was that I was using initByReferencingURL to get the NSImage. This doesn't work for local files, so instead I used initByReferencingFile and everything worked out well!
is it possible to convert the HTML page to image in cocoa?
Actually i have created the complete view in the HTML and now i want to convert the whole html preview to the image (any jpeg or png etc.).
I couldn't find any resource or sample on the web, which provides some sort of help on my above queries.It's highly appreciated if someone could share his wisdom on how I can achieve this.
Thanks in advance..
First off, I'd like to thank sergio... his answer got me started but I thought I'd share some of the code that I didn't find obvious that I had to write to make it work:
Here's how to make a thumbnail for a page without ever having it displayed:
// Your width and height can be whatever you like, but if you want this to render
// off screen, you need an x and y bigger than the superview's width and height
UIWebView* webView = [[UIWebView alloc] initWithFrame:CGRectMake(largerScreenDimension, largerScreenDimension, largerScreenDimension, largerScreenDimension)];
[self.view addSubview:webView]; // UIWebViews without an assigned superview don't load ever.
webView.delegate = self; // or whoever you have implement UIWebViewDelegate
webView.scalesToFit = YES; // This zooms the page appropriately to fill the entire thumbnail.
[webView loadRequest:[NSURLRequest requestWithURL:url]];
Then implement this in your delegate:
- (void)webViewDidFinishLoad:(UIWebView *)webView {
UIGraphicsBeginImageContext(webView.bounds.size);
[webView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *webViewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData *thumbnailData = UIImagePNGRepresentation(webViewImage);
[webView removeFromSuperview];
}
Finally, to display this thumbnail you'll need something like:
thumbnailImageView.image = [UIImage imageWithData:thumbnailData];
As a bonus thing I'll mention, I wanted multiple thumbnails to be generated at once. I found using objc_setAssociatedObject() and objc_getAssociatedObject() to be very helpful with keeping track of which webView was loading which thumbnail. Going into detail on how that worked is beyond the scope of this question, though.
You can draw your view in an image context, like this:
UIWebView* view = ...
....
UIGraphicsBeginImageContext(view.bounds.size);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData *imagedata = UIImagePNGRepresentation(viewimage);
NSString *encodedString = [imageData base64Encoding];
Another option would be using Quartz PDF engine to create a PDF.