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非AppStore应用更新检查的教程
鉴于近来发现很多人对于应用更新这一方面的了解比较少，所以就发个教程供大家参考。
App很简单，运行以后，只有一个Check按钮：
按下按钮，这个App会从服务器上检查更新数据，并且显示出新版本和新特性，且指引用户跳转到下载界面
修改版本号到最新版本，再次运行，就会看到最新版本的提示
看起来很简单的App，先大致说一下思路帮助理解：
按钮点击以后，程序会获取当前版本并向服务器发送数据，得到数据以后进行处理，判断是否有新版本并展示给用户，从而实现检查更新
按照上面的思路，先要搭建好服务器端
★首先，如果没有域名空间的童鞋请先去开通一个免费的域名空间（本人开通的是）
★接下来，在Win上面用DreamWeaver建一个ASP VBScript，取名为“CheckUpdate.asp”输入下面的代码（我会解释的）：
复制代码 - <html>
- <%@LANGUAGE="VBSCRIPT"CODEPAGE="65001"%>
- <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
-
- <head>
- <title>版本检查</title>
- </head>
-
- <body>
- <%
- set fs=server.createobject("scripting.filesystemobject")
- file=server.mappath("Update.txt")
- set txt=fs.opentextfile(file,1,true)
-
- requestStr=request("type")
-
- txt.skipLine()
- line=txt.readline
- if line=requestStr then
- resp*****e.write "Newest"
- else
- resp*****e.write line
- line=txt.readAll
- resp*****e.write line
- end if
- %>
- </body>
- </html>
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★接着建立一个Update.txt，在里面输入：
复制代码 - [Update]
- 1.0
- [New]
- ★新功能1
- ★新功能2
- ★新功能3
- ★新功能4
- ★新功能5
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★把它和这个ASP放在一起，进行本地测试（也可以直接传到空间上测试）
输入网址：http://你的域名/CheckUpdate.asp?type=应用版本
对于我就输入：
就会看到”Newest“的提示，如果把版本换成0.9就可以看到
”1.0[New] ★新功能1 ★新功能2 ★新功能3 ★新功能4 ★新功能5“的提示
★这样就实现了一个使用服务器检查更新的功能，对上面的代码简单的解释以下
★上面代码会根据url中的"type"参数（也就是传过去的当前版本号）与txt中的最新版本号（这里是1.0）进行比对，如果相同，就显示”Newest“
如果不相同，就显示”新版本号 + [new] + 新功能"
★更新检查服务器的搭建大致讲到这里，当然也可以用PHP来实现，不过鉴于我对PHP一窍不通，就用ASP来实现
★接下来要做ios端的实现，添加一个类用于检查更新：
复制代码 -
- //★DFUpdateChecker.h
-
- #import <Foundation/Foundation.h>
-
- @protocol DFUpdateCheckerDelegate <NSObject>
-
- -(void)checkFinishedWithNewVersion:(NSString*)theNewVersion NewThing:(NSString*)theNewThing;
-
- @end
-
- @interface DFUpdateChecker:NSObject<NSURLConnectionDelegate>{
- NSMutableData *receivedData;
- NSURLConnection *theConncetion;
-
- id<DFUpdateCheckerDelegate> delegate;
- NSString *newVersion;
- NSString *newThings;
-
- }
- @property(retain,nonatomic)id<DFUpdateCheckerDelegate> delegate;
- -(void)cancelDownload;
- -(void)startCheckWithURLString:(NSString*)theURL;
- -(void)checkNew;
- -(id)init;
- @end
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复制代码 -
- //★DFUpdateChecker.m
-
- #import "DFUpdateChecker.h"
-
- @implementation DFUpdateChecker
- @synthesize delegate;
- NSString *result;
-
- -(void)connection:(NSURLConnection*)connection didReceiveData:(NSData *)data{
- [receivedData appendData:data];
- }
-
- -(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{
- [[UIApplication sharedApplication]setNetworkActivityIndicatorVisible:NO];
- [connection release];
- [receivedData release];
- NSLog(@"Error");
- }
-
- -(void)connectionDidFinishLoading:(NSURLConnection *)connection{
- [[UIApplication sharedApplication]setNetworkActivityIndicatorVisible:NO];
-
- result=[result initWithData:receivedData encoding:NSUTF8StringEncoding];
- result=(NSString*)[[result componentsSeparatedByString:@"<body>"] objectAtIndex:1];
- result=[[result componentsSeparatedByString:@"</body>"] objectAtIndex:0];
- result=[result stringByTrimmingCharactersInSet: [NSCharacterSet newlineCharacterSet]];
-
- [connection release];
- [receivedData release];
-
- if([result isEqualToString:@"Newest"]==YES){
- newVersion=@"Newest";
- }else{
- newVersion=[newVersion initWithString:[[result componentsSeparatedByString:@"[New]"] objectAtIndex:0]];
- newThings=[newThings initWithString:[[result componentsSeparatedByString:@"[New]"] objectAtIndex:1]];
- newThings=[newThings stringByTrimmingCharactersInSet: [NSCharacterSet newlineCharacterSet]];
- }
- [delegate checkFinishedWithNewVersion:newVersion NewThing:newThings];
- }
-
- -(void)dealloc{
- [super dealloc];
- }
-
- -(void)cancelDownload
- {
- [[UIApplication sharedApplication]setNetworkActivityIndicatorVisible:NO];
- [theConncetion cancel];
- theConncetion = nil;
- receivedData = nil;
- }
-
- -(NSString*)getNowVersion{
- NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];
- NSString *result_=[infoDictionary objectForKey:@"CFBundleShortVersi*****tring"];
- return result_;
- }
-
- -(void)checkNew{
- [self startCheckWithURLString:[NSString stringWithFormat:@"http://hi.223366.info/CheckUpdate.asp?type=%@",[self getNowVersion]]];
- }
-
- -(id)init{
- if(self=[super init]){
- result=[NSString alloc];
- newVersion=[NSString alloc];
- newThings=[NSString alloc];
- }
- return self;
- }
-
- -(void)startCheckWithURLString:(NSString*)theURL{
- NSURLRequest *theRequest=[NSURLRequest requestWithURL:[NSURL URLWithString:theURL] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];
- theConncetion=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
- if(theConncetion){
- receivedData=[[NSMutableData data] retain];
- [[UIApplication sharedApplication]setNetworkActivityIndicatorVisible:YES];
- }else{
- NSLog(@"Can't start the connection!");
- }
- }
-
- @end
-
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★这个类用于异步获取更新数据，然后通过委托传递出去。注意把里面的检查url换成你自己的
★然后，在视图控制器上面加上这些实现代码：
复制代码 -
- -(void)checkFinishedWithNewVersion:(NSString *)theNewVersion NewThing:(NSString *)theNewThing{
- [button setTitle:@"Check" forState:UIControlStateNormal];
- [button setEnabled:YES];
- UIAlertView *alert;
- if(theNewVersion==@"Newest"){
- alert=[[UIAlertView alloc]initWithTitle:@"软件更新" message:@"您的应用是最新版" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil];
- [alert show];
- }else{
- NSString *text=[NSString stringWithFormat:@"有新的版本（%@）可供使用\n此版本有如下新特性：\n%@",theNewVersion,theNewThing];
- alert=[[UIAlertView alloc]initWithTitle:@"软件更新" message:text delegate:self cancelButtonTitle:@"以后再说" otherButtonTitles:@"立即下载",nil];
- [alert show];
- }
- [alert release];
- }
-
- -(void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex{
- if(buttonIndex==0){
- return;
- }else if(buttonIndex==1){
- [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"http://bill123.5gbfree.com"]];
- }
- }
-
- -(IBAction)checkButtonClicked:(id)sender{
- [button setTitle:@"Checking" forState:UIControlStateNormal];
- [button setEnabled:NO];
- DFUpdateChecker *checker=[[DFUpdateChecker alloc]init];
- checker.delegate=self;
- [checker checkNew];
- [checker release];
- }
-
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★这样就OK了，运行结果请看最前面的图
Deam：
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