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iOS上创建桌面快捷方式应用场景：
在iOS设备桌面创建app内某一个模块或页面的快捷方式，通过该快捷方式可以直接进入相应模块或页面。目前app内有该功能的有高德一键导 航，360安全卫士的小火箭。技术原理： 在iOS开发中可以使用openUrl的方式打开一个网页，并通过Safari浏览器的发送到主屏幕从而创建一个网页的快捷方式，这篇文章就是利用这个方 法来创建一个app的桌面快捷方式。首先在app内部开启一个轻量级的HttpServer，利用openurl：127.0.0.1 的方式打开本地页面，利用html的重定向将页面指向一个包含创建桌面快捷方式所有信息的，遵守data协议的url，这时利用Safari的发送到主屏 幕，就可以达到我们的要求。
技术难点：
1. 创建一个本地的httpServer。2. 创建本地页面以及data协议url时的编码格式。3. 在Safari未启动时或者app进入后台时，本地httpserver服务启动延迟。
- (id)init
{
if(self = [super init]){
//启动本地httpSever和服务器首页页面
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsPath = paths[0];
self.webRootDir = [documentsPath stringByAppendingPathComponent:@"web"];
BOOL isDirectory = YES;
BOOL exsit = [[NSFileManager defaultManager] fileExistsAtPath:_webRootDir isDirectory:&isDirectory];
if(!exsit){
[[NSFileManager defaultManager] createDirectoryAtPath:_webRootDir withIntermediateDirectories:YES attributes:nil error:nil];
}
self.mainPage = [NSString stringWithFormat:@"%@/web/index.html",documentsPath];
[DDLog addLogger:[DDTTYLogger sharedInstance]];
_httpServer = [[HTTPServer alloc] init];
[_httpServer setType:@"_http._tcp."];
[_httpServer setDocumentRoot:_webRootDir];
NSError *error;
if([_httpServer start:&error])
{
DDLogInfo(@"Started HTTP Server on port %hu", [_httpServer listeningPort]);
}
else
{
DDLogError(@"Error starting HTTP Server: %@", error);
}
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationDidEnterBackground:) name:UIApplicationDidEnterBackgroundNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationWillEnterForeground:) name:UIApplicationWillEnterForegroundNotification object:nil];
}
return self;
}
- (void)applicationDidEnterBackground:(UIApplication *)application
{
if([[UIDevice currentDevice].systemVersion integerValue] >= 6.0){
sleep(1);
}else {
sleep(2);
}
[_httpServer stop];
}
- (void)applicationWillEnterForeground:(UIApplication *)application
{
NSError *error;
if(![_httpServer isRunning]){
if([_httpServer start:&error])
{
DDLogInfo(@"Started HTTP Server on port %hu", [_httpServer listeningPort]);
}
else
{
DDLogError(@"Error starting HTTP Server: %@", error);
}
}
}
- (void)createLinkWithDict:(NSDictionary *)dict desktopLinkType:(SyDesktopLinkType)linkType;
{
NSString *title = [dict objectForKey:deskLinkTitle];
NSString *urlScheme = [dict objectForKey:deskLinkUrlScheme];
NSString *moduleID = [dict objectForKey:deskLinkModuleTag];
NSString *imageName = [dict objectForKey:deskLinkIconName];
NSMutableString *htmlStr = [[NSMutableString alloc] init];
[htmlStr appendString:@"<html><head>"];
[htmlStr appendString:@"<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\">"];
NSMutableString *taragerUrl = [NSMutableString stringWithFormat:@"0;url=data:text/html;charset=UTF-8,<html><head><meta content=\"yes\" name=\"apple-mobile-web-app-capable\" /><meta content=\"text/html; charset=UTF-8\" http-equiv=\"Content-Type\" /><meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0, user-scalable=no\" /><title>%@</title></head><body bgcolor=\"#ffffff\">",title];
NSString *htmlUrlScheme = [NSString stringWithFormat:@"<a href=\"%@",urlScheme];
NSString *dataUrlStr = nil;
if(linkType == SyDesktopLinkType_One){
dataUrlStr = [NSString stringWithFormat:@"%@=%@&%@=%@\" id=\"qbt\" style=\"display: none;\"></a>",deskLinkModuleTag,moduleID,deskLinkType,[NSString stringWithInt:linkType]];
}else if (linkType == SyDesktopLinkType_Two){
//业务生成器功能
}else if(linkType == SyDesktopLinkType_Three){
}
UIImage *image = [UIImage imageNamed:imageName];
NSData *imageData = UIImagePNGRepresentation(image);
NSString *base6ImageStr = [imageData base64Encoding];
// 转码
// dataUrlStr = [dataUrlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSString *imageUrlStr = [NSString stringWithFormat:@"<span id=\"msg\"></span></body><script>if (window.navigator.standalone == true) { var lnk = document.getElementById(\"qbt\"); var evt = document.createEvent('MouseEvent'); evt.initMouseEvent('click'); lnk.dispatchEvent(evt);}else{ var addObj=document.createElement(\"link\"); addObj.setAttribute('rel','apple-touch-icon-precomposed'); addObj.setAttribute('href','data:image/png;base64,%@');",base6ImageStr];
NSString *lastHtmlStr = @"document.getElementsByTagName(\"head\")[0].appendChild(addObj); document.getElementById(\"msg\").innerHTML='<div style=\"font-size:12px;\">点击页面下方的 + 或 <img id=\"i\" src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAMAAAC6V+0/AAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAyJpVFh0WE1MOmNvbS5hZG9iZS54bXAAAAAAADw/eHBhY2tldCBiZWdpbj0i77u/IiBpZD0iVzVNME1wQ2VoaUh6cmVTek5UY3prYzlkIj8+IDx4OnhtcG1ldGEgeG1sbnM6eD0iYWRvYmU6bnM6bWV0YS8iIHg6eG1wdGs9IkFkb2JlIFhNUCBDb3JlIDUuMy1jMDExIDY2LjE0NTY2MSwgMjAxMi8wMi8wNi0xNDo1NjoyNyAgICAgICAgIj4gPHJkZjpSREYgeG1sbnM6cmRmPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5LzAyLzIyLXJkZi1zeW50YXgtbnMjIj4gPHJkZjpEZXNjcmlwdGlvbiByZGY6YWJvdXQ9IiIgeG1sbnM6eG1wPSJodHRwOi8vbnMuYWRvYmUuY29tL3hhcC8xLjAvIiB4bWxuczp4bXBNTT0iaHR0cDovL25zLmFkb2JlLmNvbS94YXAvMS4wL21tLyIgeG1sbnM6c3RSZWY9Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC9zVHlwZS9SZXNvdXJjZVJlZiMiIHhtcDpDcmVhdG9yVG9vbD0iQWRvYmUgUGhvdG9zaG9wIENTNiAoV2luZG93cykiIHhtcE1NOkluc3RhbmNlSUQ9InhtcC5paWQ6OTU1NEJDMzMwQTBFMTFFM0FDQTA4REMyNUE4RkExNkEiIHhtcE1NOkRvY3VtZW50SUQ9InhtcC5kaWQ6OTU1NEJDMzQwQTBFMTFFM0FDQTA4REMyNUE4RkExNkEiPiA8eG1wTU06RGVyaXZlZEZyb20gc3RSZWY6aW5zdGFuY2VJRD0ieG1wLmlpZDo5NTU0QkMzMTBBMEUxMUUzQUNBMDhEQzI1QThGQTE2QSIgc3RSZWY6ZG9jdW1lbnRJRD0ieG1wLmRpZDo5NTU0QkMzMjBBMEUxMUUzQUNBMDhEQzI1QThGQTE2QSIvPiA8L3JkZjpEZXNjcmlwdGlvbj4gPC9yZGY6UkRGPiA8L3g6eG1wbWV0YT4gPD94cGFja2V0IGVuZD0iciI/PlMy2ugAAAAbUExUReXy/yaS/4nE/67W//n8/+n0/0yl/wB//////1m3cVcAAAAJdFJOU///////////AFNPeBIAAABDSURBVHjaxNA7DgAgCAPQoiLc/8T+EgV1p0ubxwb0E+xR8SBICBcyJUnEHktW0VwOykivvSaus6kA1CD0sZ+3aQIMAJIgC+S9X9jmAAAAAElFTkSuQmCC\"> 按钮，在弹出的菜单中选择［添加至主屏幕］，即可将选定的功能添加到主屏幕作为快捷方式。</div>';}</script></html>";
[taragerUrl appendString:htmlUrlScheme];
[taragerUrl appendString:dataUrlStr];
NSString *dataUrlEncode = [taragerUrl urlUTF8Encoded];
NSString *imageUrlEncode = [imageUrlStr urlUTF8Encoded];
NSString *lastHtmlStrEncode = [lastHtmlStr urlCFEncoded];
[htmlStr appendFormat:@"<meta http-equiv=\"REFRESH\" content=\"%@%@%@\">",dataUrlEncode,imageUrlEncode,lastHtmlStrEncode];
[htmlStr appendString:@"</head></html>"];
NSData *data = [htmlStr dataUsingEncoding:NSUTF8StringEncoding];
[data writeToFile:_mainPage atomically:YES];
NSString *urlStrWithPort = [NSString stringWithFormat:@"http://127.0.0.1:%d",[_httpServer listeningPort]];
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:urlStrWithPort]];
}