I am loading a UIWebview of a hosted .jpg. It's actually a schedule, so it is a rather large image. Instead of having users have to zoom in right away, I would like to load the web view already zoomed in. Although I still need the user to be able to zoom in and out, and scroll. Basically I am just looking for an "initial" zoom. How would I accomplish this? Just FYI I put the method below I am using to load the image...Thanks!
// Webview code
NSString *urlAddress = #"http://www.google.com";
//Create a URL object.
NSURL *url = [NSURL URLWithString:urlAddress];
//URL Requst Object
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
//Load the request in the UIWebView.
[webview loadRequest:requestObj];
In iOS 5 you can access the UIWebView's scrollView property and set the zoom level on it after the page has loaded. That would likely work as you wanted. To get the same thing on pre-iOS 5 you'd probably want to go through the UIWebView's subviews until you find a UIScrollView and do the same thing on that.
I don't think there's any other way to programatically zoom it. Unless you can do it with Javascript and execute some using UIWebView's stringByEvaluatingJavaScriptFromString: method.
Related
I am using UIWebView to display textual content in my app (I store the content in local HTML files that I pack with the app). All together, I have three web views whose content I change dynamically based on user feedback.
Although some might argue that this is not the most accepted way, I find UIWebView very convenient to display formatted text, and modify that text using HTML if necessary. While this works 99% of the time, on occasion, I experience problems that generally fall into one of these categories:
Sometimes, the web view content loads slow and is late a second or so.
The content loads but is not showing. However, as long as, I touch the view (try to scroll or something) the content pops in.
A few times I received memory warnings (usually not long after the app's initial loading) that in no way affected the performance of my app. It logged the memory warning but the app worked like nothing happened.
This is the method I use to load content to my web views:
- (void)loadSimpleDocument:(NSString*)documentName inView:(UIWebView*)webView
{
NSString *path = [[NSBundle mainBundle] pathForResource:documentName ofType:#"html"];
NSURL *url = [NSURL fileURLWithPath:path];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[webView loadRequest:request];
}
Aside from this, the shouldStartLoadWithRequest delegate method is also implemented, always returning a YES.
My question is: Is there a way to improve the reliability/performance of my web views (in particular loading)? Is there something I have overlooked, did wrong, or do not know about?
Some additional info:
I am on iOS6 SDK, use ARC, and do everything programmatically (do not use IB or storyboard).
You have 2 options to check what's going on:
Implement webViewDidStartLoad & webViewDidFinishLoad delegate methods to check why the content isn't showing (may be the content isn't loaded yet).
read the html content to an NSString then use loadHTMLString:baseURL instead of using loadRequest and check if it loads faster.
Hope this could help.
In my iPad application I have a UIWebView with a youtube video embedded in it. I have matched the UIWebView size and the size of the embedded video as well as made sure that the aspect ratio was correct. I have set the UIWebView background color to clear color with no luck. How can I center the embedded video inside my UIWebView. I also used content mode: center and it doesn't seem to respect it. See the screenshot below:
http://cl.ly/1N3c0d343r3v1i0J1h0d
NSString *video_ID = #"7Ek1QwGp9Tw?rel=0";
NSString *htmlStr = [NSString stringWithFormat:#"<iframe class=\"youtube-player\" type=\"text/html\" width=\"453\" height=\"255\" src=\"http://www.youtube.com/embed/%#\" frameborder=\"0\"></iframe>",video_ID];
[webView loadHTMLString:htmlStr baseURL:nil];
Any help would be appreciated.
just a wild guess: you need to reset the margins and paddings of your html documents body and the youtube iframe.
edit add something like <html><head><title>.</title><style>body,html,iframe{margin:0;padding:0;}</style></head><body>[YOUR YOUTUBE CODE]</body></html>
Don't use an iframe, just load the video directly in the webview (a webview is basically like a "native" iframe anyway):
NSString *URLString = [NSString stringWithFormat:#"http://www.youtube.com/embed/%#",video_ID];
NSURL *URL = [NSURL URLWithString:URLString];
NSURLRequest *request = [NSURLRequest requestWithURL:URL];
[webView loadRequest:request];
I am trying to display url in UIWebView but I can not display, webview just call the fail with error method. My url is this "http://www.tekniknoktamarket.com/index.php?route=feed/google_base",
So please help me how to display this url in UIWebView *?*
In order to have a UIWebView download and display the content from a URL, you need to go through a couple of layers of abstraction, the first being an instance of NSURL, which contains your URL string. Then, you hand the NSURL to an instance of NSURLRequest. Finally, you hand the NSURLRequest to the webView. It all looks something like this:
NSURL *url = [NSURL URLWithString:#"www.your-url.com"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[yourWebView loadRequest:request];
That should do it.
This is the code loading a URL into a webview:
[webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:#"http://www.theurl.com"]]];
If you're using this code and are encountering any problems, please provide the code you were using and the exact error
For a current project I am embedding a mobile site into an iOS app. I've taken use of the goback() and goforward() functions, with UIWebView. But how would I make a custom function that onClick (or onTouch which ever is the correct term) Sends the UIWebView back to the page initially loaded? Any Help would be much appreciated as I have bene unable to find anything on the web thus far.
Add something like to the implementation file:
- (IBAction)loadPage:(id)sender;
{
NSURL *url = [NSURL URLWithString:#"http://www.stackoverflow.com/"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[webView loadRequest:request];
}
And add this to the header file (each line at the appropriate position):
- (IBAction)loadPage:(id)sender;
IBOutlet UIWebView *webView;
Then bind the button to loadPage within interface builder,
and bind webView to the UIWebView.
Response to comment:
I created this sample project, hopefully it helps:
- http://dd5.org/static/iPhone_Browser_Sample.zip
Binding the button:
Right-click and drag to the class where you added the code above.
Release the button. Now a little dark-gray panel should appear.
Then click on the loadPage: entry within that panel.
If the code was added correctly, the entry should show up there.
I'm using a UIWebView to load a pure Text HTML page for my iPad app. The size of the HTMP page is only 40KB. But when I use the instrument to monitor the memory use for loading the UIWebView, I found down it consumes like 20MB memory, if I scroll the web view, the memory is even getting higher. Finally I get a level 1 memory warning.
Could anyone help me with this? How could I reduce the memory for this? (I need to use the HTML to show the text here).
NSString *htmlPath = [[NSBundle mainBundle] pathForResource:#"index" ofType:#"html" inDirectory:#"SPC"];
NSURL *url = [NSURL fileURLWithPath:htmlPath];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[webView loadRequest:request];
htmlPath
url
request
release all of them after this line
[webView loadRequest:request];
then release webview in dealloc and use webview as ivar