How to autoplay a YouTube video in a UIWebView

2019-01-04 08:50发布

站内问答 / iOS
1469 5 2

I have seen a lot of posts in here about this issue, but still couldn't find a perfect answer for this problem.

So I have a tableview, and each cell has a play button inside it. When the user tap the play button, I add a UIWebView to this cell, and play a YouTube video. 

static NSString *youTubeVideoHTML = @"<html>\
    <body style=\"margin:0;\">\
        <iframe class=\"youtube-player\" type=\"text/html\" width=\"%0.0f\" height=\"%0.0f\" src=\"http://www.youtube.com/embed/%@\" frameborder=\"0\">\
        </iframe>\
    </body>\
    </html>";


- (void)playVideoWithId:(NSString *)videoId {
    NSString *html = [NSString stringWithFormat:youTubeVideoHTML, self.frame.size.width, self.frame.size.height, videoId];

    [self loadHTMLString:html baseURL:nil];
}

The problem:

This code doesn't actually play the video like I want, it just initiate the YouTube player and show it with the YouTube red play button. Only when user tap the red button, the video will start playing.
So user has to tap two buttons until the video starts - not the best user experience...

Like I said I saw many posts about this issue, some not work at all, and some works but with some issues that bugs me.

One of the working solutions I found was in this post by @ilias, he shows how to get this working with loading the HTML from a file (instead of a string like I do), problem with this approche is that for every video I play I need to:
load the htm file -> embed the video Id in it -> write the file to disc -> only now I can play the video.

Strange thing is that this solution only work when you load the web view request from a file, if I try to load the request from a string equal to the file content, that doesn't work.

5条回答
三岁会撩人
2楼-- · 2019-01-04 08:59 
- (void)playVideoWithId:(NSString *)videoId {

NSString *youTubeVideoHTML = @"<html><head><style>body{margin:0px 0px 0px 0px;}</style></head> <body> <div id=\"player\"></div> <script> var tag = document.createElement('script'); tag.src = 'http://www.youtube.com/player_api'; var firstScriptTag = document.getElementsByTagName('script')[0]; firstScriptTag.parentNode.insertBefore(tag, firstScriptTag); var player; function onYouTubePlayerAPIReady() { player = new YT.Player('player', { width:'768', height:'1024', videoId:'%@', events: { 'onReady': onPlayerReady } }); } function onPlayerReady(event) { event.target.playVideo(); } </script> </body> </html>";

NSString *html = [NSString stringWithFormat:youTubeVideoHTML, videoId];

UIWebView *videoView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 320, 300)];
videoView.backgroundColor = [UIColor clearColor];
videoView.opaque = NO;
//videoView.delegate = self;
[self.view addSubview:videoView];

videoView.mediaPlaybackRequiresUserAction = NO;

[videoView loadHTMLString:html baseURL:[[NSBundle mainBundle] resourceURL]];
}

I did some correction to the code above.

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三岁会撩人
3楼-- · 2019-01-04 09:06

Here is full solution:

//
//  S6ViewController.m
//  
//
//  Created by Ökkeş Emin BALÇİÇEK on 11/30/13.
//  Copyright (c) 2013 Ökkeş Emin BALÇİÇEK. All rights reserved.
//

#import "S6ViewController.h"

@interface S6ViewController ()

@end

@implementation S6ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    [self playVideoWithId:@"sLVGweQU7rQ"];

}




- (void)playVideoWithId:(NSString *)videoId {

     NSString *youTubeVideoHTML = @"<html><head><style>body{margin:0px 0px 0px 0px;}</style></head> <body> <div id=\"player\"></div> <script> var tag = document.createElement('script'); tag.src = 'http://www.youtube.com/player_api'; var firstScriptTag = document.getElementsByTagName('script')[0]; firstScriptTag.parentNode.insertBefore(tag, firstScriptTag); var player; function onYouTubePlayerAPIReady() { player = new YT.Player('player', { width:'768', height:'1024', videoId:'sLVGweQU7rQ', events: { 'onReady': onPlayerReady } }); } function onPlayerReady(event) { event.target.playVideo(); } </script> </body> </html>";

    NSString *html = [NSString stringWithFormat:youTubeVideoHTML, videoId];

    UIWebView *videoView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 768, 1024)];
    videoView.backgroundColor = [UIColor clearColor];
    videoView.opaque = NO;
    //videoView.delegate = self;
    [self.view addSubview:videoView];

    videoView.mediaPlaybackRequiresUserAction = NO;

    [videoView loadHTMLString:youTubeVideoHTML baseURL:[[NSBundle mainBundle] resourceURL]];
}

@end
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手持菜刀，她持情操
4楼-- · 2019-01-04 09:12

The key here is to set playsinline=1 in your iFrame player, and allowsInlineMediaPlayback = true and mediaPlaybackRequiresUserAction = false for your UIWebView. Here's my implementation in Swift:

// Set up your UIWebView
let webView = UIWebView(frame: self.view.frame) // or pass in your own custom frame rect

self.view.addSubview(webView)
self.view.bringSubviewToFront(webView)

// Set properties
webView.allowsInlineMediaPlayback = true
webView.mediaPlaybackRequiresUserAction = false

// get the ID of the video you want to play
let videoID = "zN-GGeNPQEg" // https://www.youtube.com/watch?v=zN-GGeNPQEg

// Set up your HTML.  The key URL parameters here are playsinline=1 and autoplay=1
// Replace the height and width of the player here to match your UIWebView's  frame rect
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>"

// Load your webView with the HTML we just set up
webView.loadHTMLString(embededHTML, baseURL: NSBundle.mainBundle().bundleURL)
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再贱就再见
5楼-- · 2019-01-04 09:18

Apparently the problem was with the nil base url, when I changed it to resourceURL the autoplay worked.

[self loadHTMLString:html baseURL:[[NSBundle mainBundle] resourceURL]];

The full code for autoplay youtube videos (again this code mostly based on this post I just changed it to load from a string instead of a file): 

static NSString *youTubeVideoHTML = @"<!DOCTYPE html><html><head><style>body{margin:0px 0px 0px 0px;}</style></head> <body> <div id=\"player\"></div> <script> var tag = document.createElement('script'); tag.src = \"http://www.youtube.com/player_api\"; var firstScriptTag = document.getElementsByTagName('script')[0]; firstScriptTag.parentNode.insertBefore(tag, firstScriptTag); var player; function onYouTubePlayerAPIReady() { player = new YT.Player('player', { width:'%0.0f', height:'%0.0f', videoId:'%@', events: { 'onReady': onPlayerReady, } }); } function onPlayerReady(event) { event.target.playVideo(); } </script> </body> </html>";  

- (void)playVideoWithId:(NSString *)videoId {
    NSString *html = [NSString stringWithFormat:youTubeVideoHTML, self.frame.size.width, self.frame.size.height, videoId];

    [self loadHTMLString:html baseURL:[[NSBundle mainBundle] resourceURL]];
}
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等我变得足够好
6楼-- · 2019-01-04 09:22

Use following code to play a youtube video in the UIWebView

Here we required "embed link" :

  • Just open your youtube link in browser
  • Right click on video
  • Select option "Get embed code"

  • You'll get output like - 

    <iframe width="640" height="390" src="https://www.youtube.com/embed/xtNXZA4XMBY" frameborder="0" allowfullscreen></iframe>

  • copy the link in "src" field, this is your embed link

    Now just put this embed link on the place of "YOU_TUBE LINK" in the following code: 

    NSString *htmlString = [NSString stringWithFormat:@"<html><head><meta name = \"viewport\" content = \"initial-scale = 1.0, user-scalable = yes, width = 320\"/></head><body style=\"background:#00;margin-top:0px;margin-left:0px\"><div><object width=\"320\" height=\"480\"><param name=\"movie\" value=\"YOUTUBE_LINK\"></param><param name=\"wmode\" value=\"transparent\"></param><embed src=\"YOUTUBE_LINK\"type=\"application/x-shockwave-flash\" wmode=\"transparent\" width=\"320\" height=\"480\"></embed></object></div></body></html>"];

[self.webView_youTube loadHTMLString:htmlString baseURL:nil];
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