I have html text returned from the server and I am using a UITextView on the IOS client to render the text. I am first converting the html string to attributed string and then enumerating over the attributes and changing the font, foreground color of the text as needed. Finally I am setting the attributed text of UiTextView. However, when the html contains images and I see that they get cut off when rendered in UITextView.
Any pointers on how I could change the width and height of images contained in the html text in order to fit my phone screen width?
I use SwiftSoup to extract data from html or edit the HTML string. I also have found that when images are present it's easier to manage the layout and format inside a WKWebView.
This example also helps to add support for dark mode in your WKWebView.
var newsRssBody: String = ""
let css = "#media (prefers-color-scheme: dark) {body { background-color: rgb(38,38,41); color: white; } a:link { color: #0096e2; } a:visited { color: #9d57df; } }"
try doc.head()?.append("<style>\(css)</style>")
self.newsRssBody = "\(doc)"
The headerString line helps with content sizing based on the device.
let headerString = "<header><meta name='viewport' content='width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, user-scalable=no'></header>"
self.webView.loadHTMLString(headerSting + self.newsRssBody, baseURL: nil)
I have embedded a youtube video in a UIWebView for display in my app.
Here's the code for that:
func loadVideo(){
if let youtubeCode = exerciseYoutubeCode {
guard !youtubeCode.isEmpty else { return }
exerciseVideoWebView.isHidden = false
exerciseVideoWebView.allowsInlineMediaPlayback = true
exerciseVideoWebView.scrollView.isScrollEnabled = false
exerciseVideoWebView.scrollView.bounces = false
exerciseVideoWebView.loadHTMLString("<html><head><style>body{margin:0px}</style></head><body><iframe width=\"\(exerciseVideoWebView.frame.width)\" height=\"\(exerciseVideoWebView.frame.height)\" src=\"https://www.youtube.com/embed/\(youtubeCode)?&playsinline=1\" frameborder=\"0\" allowfullscreen></iframe></body></html>",
baseURL: nil)
}
}
The problem is that the embedded video does not seem to be respecting the width and height of the UIWebView that I am passing in to the iframe. In the simulator, the video is roughly 15-25 pixels larger than the UIWebView. I can live with that, but when running on a physical device, it's rendering 15-25 pixels smaller than the UIWebView, exposing the white of the HTML page on the right and bottom sides of the UIWebView.
The UIWebView has an AutoConstraint to a 16:9 ratio, which matches YouTube's video aspect ratio.
If I put the following script into the HTML, I can see that the width and height of the video iframe is an exact match to the height and width printed to the console for the UIWebView:
<script>setTimeout(function(){
alert(document.getElementsByTagName('iframe')[0].offsetWidth + ' ' + document.getElementsByTagName('iframe')[0].offsetHeight)},10000)
</script>
Clearly there is some sort of scaling happening if the HTML thinks its the same size as the UIWebView, but I can't figure out how to fix it.
I have embedded HTML5 video with mp4 format. How to get thumbnail image like poster without using "poster" attribute. This problem coming on Safari and iOS. I have added video like below mentioned code.
<video height=350 id='TestVideo' webkit-playsinline><source src='test.mp4' type=video/mp4></video>
On Chrome, IE, Firefox first frame of video coming as thumbnail image, but not coming on Safari and iOS.
simply add preload="metadata" in video tag and set #t=0.1 at url src, it will get the frame of 0.1s of your video as thumbnail
however, the disadvantage of this solution is when you click to play the video, it always start at 0.1s
<video preload="metadata" controls>
<source src="video.mp4#t=0.1" type="video/mp4">
</video>
If you want to do this without storing server side images it is possible, though a bit clunky... uses a canvas to record the first frame of the video and then overlay that over the video element. It may be possible to use the URL for the Canvas as a source for the Poster (eg video.poster = c.toDataURL();) but that requires correct CORS setup (not sure if the video was on your own server, and if you have control over that, so took the safest option). This will work best if video is correctly encoded for streaming (so MOOV atom is at the front of the video, otherwise it will be slow to draw the overlay - see this answer for more detail)
The HEAD contains styling for the video and the overlay (you will need to adjust sizing and position to suit your application)
<head>
<style>
video_box{
float:left;
}
#video_overlays {
position:absolute;
float:left;
width:640px;
min-height:264px;
background-color: #000000;
z-index:300000;
}
</style>
</head>
In the BODY you will need the div for the overlay and the video. The overlay div has an onclick handler to hide the overlay and start the video playing
<div id="video_box">
<div id="video_overlays" onclick="this.style.display='none';document.getElementById('video').play()"></div>
<video id="video" controls width="640" height="264">
<source src="BigBuck.mp4" type='video/mp4'>
</video>
</div>
</div>
Finally you will need code that will load the video, seek to the first frame and load the visual into a canvas that you then insert into the overlay
<script>
function generateOverlay() {
video.removeEventListener('seeked',generateOverlay); / tidy up the event handler so it doesn't redraw the overlay every time the user manually seeks the video
var c = document.createElement("canvas");
var ctx = c.getContext("2d");
c.width = 640;
c.height = 264;
ctx.drawImage(video, 0, 0, 640, 264); // take the content of the video frame and place in canvas
overlay.appendChild(c); // insert canvas into the overlay div
}
// identify the video and the overlay
var video = document.getElementById("video");
var overlay = document.getElementById("video_overlays");
// add a handler that when the metadata for the video is loaded it then seeks to the first frame
video.addEventListener('loadeddata', function() {
this.currentTime = 0;
}, false);
// add a handler that when correctly seeked, it generated the overlay
video.addEventListener('seeked', function() {
// now video has seeked and current frames will show
// at the time as we expect
generateOverlay();
}, false);
// load the video, which will trigger the event handlers in turn
video.load();
</script>
this is a bit late but we had the same scenario. I can't use the attribute 'muted' because my videos are podcasts. This is what I came up with and I hope to share it with future visitors. What I did is load the video in the body tag, drew a canvas, retrieved as base64 and applied to the video as the background image.
Since my video should be fixed 150px in height, I computed the aspect ratio so that whatever height and width of the actual video, it will be resized into 150px height and dynamic width.
$('body').append('<video class="checkmeload" style="position:absolute;top:-10000px" controls preload="auto" playsinline src="//src-here"><source src="//src-here" type="//videotype-here"></video>');
$('body').find('.checkmeload').on('loadeddata', function(){
var video = $('.checkmeload');
var canvas = document.createElement('canvas');
aspectratio = (video[0].videoWidth / video[0].videoHeight);
newwidth = (150 * aspectratio);
canvas.width = newwidth;
canvas.height = 150;
var context = canvas.getContext('2d');
context.drawImage(video[0], 0, 0, canvas.width, canvas.height);
var dataURI = canvas.toDataURL('image/jpeg');
$('body').find('.checkmeload').remove();
$('#myvideo').css('background-image','url("'+dataURI +'")');
});
Source: How to set the thumbnail image on HTML5 video?
This worked for me:
<img src="thumbnail.png" alt="thumbnail" />
/* code for the video goes here */
Now using jQuery play the video and hide the image as
$("img").on("click", function() {
$(this).hide();
// play the video now..
})
Add #t=0.001 at the end of the video URL.
https://muffinman.io/blog/hack-for-ios-safari-to-display-html-video-thumbnail/
I am trying to embed a video from youtube with the following code:
func setUpVideo() {
let width = webView.frame.width
let height = webView.frame.height
let frame = 0
bmiWebView.allowsInlineMediaPlayback = true
let videoUrl = "https://www.youtube.com/embed/GCALWdwKr48"
let htmlUrl = "<html><body><iframe width=\(width) height=\(height) src=\(videoUrl)?&playsinline = 1 frameborder=\(frame) allowfullscreen></iframe></body></html>"
webView.loadHTMLString(htmlUrl, baseURL: NSBundle.mainBundle().bundleURL)
}
I'm able to load the video initially with white background but when it loads it looks like below. I'm not sure why there is a white background. If someone can tell me how to remove that will be really helpful. Thank you.
The white background is the margin on the body of the HTML of your UIWebView.
Add some CSS to set the margin to 0 like so:
<html>
<head>
<style>body{margin:0px;}</style>
</head>
<body>
<iframe width=\(width) height=\(height) src=\(videoUrl)?&playsinline = 1 frameborder=\(frame) allowfullscreen></iframe>
</body>
</html>
How can I avoid fullscreen when playing a video in Swift 2.0?
let Code:NSString = "<iframe width=255 height=135 src=http://www.youtube.com/embed/eVk3TMB1JWY?autoplay=1&fs=0 frameborder=0 allowfullscreen=false></>"
I both tried fs=0 and allowfullscreen=false but neither work.
When the video shows up in my webview, the info about the video is also shown; how can I avoid this too?
From what you're describing, it sounds like you want to play the video "inline." Pass in whatever width and height values you want into the UIWebView constructor to allow inLine playback without the video popping open to its full screen player.
let webView = UIWebView(frame: self.view.frame) // or your custom CGRect
self.view.addSubview(webView)
self.view.bringSubviewToFront(webView)
webView.allowsInlineMediaPlayback = true
webView.mediaPlaybackRequiresUserAction = false
let videoID = "zN-GGeNPQEg" // https://www.youtube.com/watch?v=zN-GGeNPQEg
let embededHTML = "<html><body style='margin:0px;padding:0px;'><script type='text/javascript' src='http://www.youtube.com/iframe_api'></script><script type='text/javascript'>function onYouTubeIframeAPIReady(){ytplayer=new YT.Player('playerId',{events:{onReady:onPlayerReady}})}function onPlayerReady(a){a.target.playVideo();}</script><iframe id='playerId' type='text/html' width='\(self.view.frame.size.width)' height='\(self.view.frame.size.height)' src='http://www.youtube.com/embed/\(videoID)?enablejsapi=1&rel=0&playsinline=1&autoplay=1' frameborder='0'></body></html>"
webView.loadHTMLString(embededHTML, baseURL: NSBundle.mainBundle().resourceURL)
You just need to delete allowfullscreen from the link. Your link will look like this:
http://www.youtube.com/embed/eVk3TMB1JWY?autoplay=1&fs=0 frameborder=0 >