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http://us.5944.net开通一个免费的域名空间（本人开通的是http://hi.223366.info）
★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>

★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

★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：http://hi.223366.info/CheckUpdate.asp?type=1.0
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

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

★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];
}

★这样就OK了，运行结果请看最前面的图

Deam：http://download.csdn.net/detail/slinloss/4487682

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