Is there any way to refresh only part of an HTML file displayed in a UIWebView? For example, if I make changes to a div in the body, is there any way to refresh only the contents of that div tag? Or do I have to reload the entire file into my UIWebView?
You have to reload entire HTML file. It is not possible to reload only part of pure HTML file.
Using a little bit of javascript?
use javascript like this
NSString *js = [NSString stringWithFormat:#"document.getElementById('foo').innerHTML ='update';"];
NSString *res = [self stringByEvaluatingJavaScriptFromString:js];
Related
I loaded a file on uiWebView. Its extension type is ".pages". Now I trying to get HTML string from webview, but it returns to empty string.
For ".doc or .docx" files getting the String. It happens to ".pages" extension only.
Thanks in Advance,
NSString *html = [webView stringByEvaluatingJavaScriptFromString:#"document.documentElement.outerHTML"];
Refer this post - Reading HTML content from a UIWebView
My question is: Can UIWebView import from website only plain text? Without any formatting etc? Or mayby there is another simple way to import just simple text from website into an iOS app?
Thanks for help!
It shouldn't be done with UIWebView.
Use an Http Connection to get page content then strip the HTML tags.
nsurlConnection
Stripping
or, in the did finish loading get html and strip it then reset the webview content
- (void)webViewDidFinishLoad:(UIWebView *)webView {
[myUIWebView loadHTMLString:strripedString baseURL:nil];
}
In my app for iOS i need to create a pdf document from my webview content. I watched these posts: Creating PDF file from UIWebView and https://coderchrismills.wordpress.com/2011/06/25/making-a-pdf-from-a-uiwebview/
I wonder if there is a simpler way to do it. For example for my project for Mac i use this:
NSData *pdf = [[[[webView mainFrame] frameView] documentView] dataWithPDFInsideRect:[[[webView mainFrame] frameView] documentView].frame];
PDFDocument *doc = [[PDFDocument alloc] initWithData:pdf];
Is there any simple way to do this in iOS?
Which is the best option to obtain best quality pdf document from a webview content?
There isn't a method that allows this directly via the SDK like there is on Mac however you may wish to take a look at BNHtmlPdfKit which allows you to save the contents of URLs, web views and also html strings as PDFs.
For example, as follows:
self.htmlPdfKit = [BNHtmlPdfKit saveUrlAsPdf:[NSURL URLWithString:#"http://itsbrent.net"] toFile:#"...itsbrent.pdf" pageSize:BNPageSizeA6 success:^(NSString *pdfFileName) {
NSLog(#"Done");
} failure:^(NSError *err) {
NSLog(#"Failure");
}];
It makes use of a custom UIPrintPageRenderer which overrides paperRect and printableRect thus causing the UIPrintFormatter to return a pageCount as well as render the document.
I found good answer by AnderCover at
"Creating PDF file from UIWebView"
also it's not using any third party api. To create pdf from webview.
Hope it help's you.
I want to load a web site on a UIWebView which is not under my control and edit/add certain UI changes (Some texts, images, etc) to it. Can I do this within my iOS source code? I can't change the hosted html contents since them not under my control.
If this cannot doable within iOS source code, please advice me the correct way to achieve this.
Load the webpage into an NSString, make any modifications and then put the html into the UIWebView.
NSURL *url = [NSURL URLWithString:#"http://example.com/"];
NSString *page = [NSString stringWithContentsOfURL:url usedEncoding:nil error:nil];
/* Make changes to page here */
[self.webView loadHTMLString:page baseURL:nil];
I'd get the dom with JavaScript, manipulate, then inject back with JavaScript.
See stringByEvaluatingJavaScriptFromString:.
You can write your own full featured, minified JavaScript, then pass into using this method.
// Change body color of any HTML content inside a UIWebView.
NSString *javaScript = #"document.getElementByTagName('body').backgroundColor = '#888';";
[webView stringByEvaluatingJavaScriptFromString:javaScript];
I'm trying to show a UIWebView with a GIF in it, but only once the GIF has loaded.
I load the GIF as follows:
self.GIFWebView = [[UIWebView alloc] init];
self.GIFWebView.delegate = self;
NSString *html = [NSString stringWithFormat:#"<html><head></head><body><img src=\"%#\"></body></html>", post.url];
[self.GIFWebView loadHTMLString:html baseURL:nil];
Where post is just an object with some properties such as the URL for the GIF.
Then in webViewDidFinishLoad: I show the web view:
- (void)webViewDidFinishLoad:(UIWebView *)webView {
NSLog(#"%f", webView.scrollView.frame.size.width);
NSLog(#"%#", [webView.request.URL absoluteString]);
}
I get "0" and "about:blank" for the NSLogs each time, however.
Why does it not load the GIF properly?
I get "0" and "about:blank" for the NSLogs each time, however.
Not surprising. You're telling the web view to load HTML that you're providing in a string rather than giving it a request. The URL that you're logging is the request URL, and since there's no request, there's no request URL.
Why does it not load the GIF properly?
Possibly because you're misusing the URL object. Look at the code:
NSString *html = [NSString stringWithFormat:#"<html><head></head><body><img src=\"%#\"></body></html>", post.url];
We can't tell what type post.url is, but it's probably NSURL*. You're probably passing a NSURL into the format string, and that may not produce the result you're looking for. Try passing in a string like [post.url absoluteString] instead of the actual NSURL object.
Also, you might want to log the value of html right after you create it so that you can check the full HTML that you're sending to the web view.
Update: Some additional things to check:
Are you running the code in question on the main thread?
Is the thread's run loop getting time?
Have you tried setting a non-nil base URL?
If the web view's delegate has a -webView:shouldStartLoadWithRequest: method, does it return YES?
What happens if you use a constant string that includes the HTML you want and the hard-coded URL instead of constructing the string with +stringWithFormat:?
Is the test device connected to the network? (Sometimes it's the simplest thing that gets you.)
Does it work correctly if you use a different image? I notice that the URL you're using is for an animated .gif file, try a non-animated .gif or a .jpg image instead.
Update 2: The problem lies in your creation of the web view. Look at the very first line in the code that you showed:
self.GIFWebView = [[UIWebView alloc] init];
That looks okay for a typical object, but -init is not the designated initializer for a view. You should use -initWithFrame: instead. The image loads fine in your sample project when I change the code in your project to use the right initializer:
UIWebView *GIFWebView = [[UIWebView alloc] initWithFrame:self.view.bounds];