iPhone獲得User-Agent(UA)信息的方法
作者：佚名
User-Agent(簡(jiǎn)稱UA)是HTTP請(qǐng)求頭部用來標(biāo)識(shí)客戶端信息的字符串, 包括操作系統(tǒng), 瀏覽器等信息. 為了建立手機(jī)客戶端的信息數(shù)據(jù)庫(kù), 需要從手機(jī)的http請(qǐng)求中取到這一字符串.
如果你需要獲取Android手機(jī)的UA信息，請(qǐng)移步這里Android獲得UA信息的方法
iPhone中取到UA信息的方法如下:
1.利用瀏覽器控件UIWebView建立一個(gè)http請(qǐng)求
2.在請(qǐng)求建立的期間, 建立一個(gè)新的事件循環(huán)用來判斷UA信息是否已經(jīng)建立
3.在發(fā)送http請(qǐng)求之前截獲UA信息, 并且取消這一http請(qǐng)求 ;)
獲取iPhone UA的代碼如下:
- UIWebView *_webView;
- NSString *userAgent;
- - (void)createHttpRequest {
- _webView = [[UIWebView alloc] init];
- _webView.delegate = self;
- [_webView loadRequest:[NSURLRequest requestWithURL:
- [NSURL URLWithString:@"http://www.eoe.cn"]]];
- NSLog(@"%@", [self userAgentString]);
- [_webView release];
- }
- -(NSString *)userAgentString
- {
- while (self.userAgent == nil)
- {
- NSLog(@"%@", @"in while");
- [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]];
- }
- return self.userAgent;
- }
- -(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
- {
- if (webView == _webView) {
- self.userAgent = [request valueForHTTPHeaderField:@"User-Agent"];
- // Return no, we don't care about executing an actual request.
- return NO;
- }
- return YES;
- }
- - (void)dealloc {
- [userAgent release];
- [super dealloc];
- }
程序在iPhone4.1模擬器中運(yùn)行結(jié)果如下:
2010-12-21 12:52:38.302 UATest[6722:207] in while
2010-12-21 12:52:38.305 UATest[6722:207] in while
2010-12-21 12:52:38.307 UATest[6722:207] in while
2010-12-21 12:52:38.307 UATest[6722:207] in while
2010-12-21 12:52:38.308 UATest[6722:207] in while
2010-12-21 12:52:38.309 UATest[6722:207] in while
2010-12-21 12:52:38.312 UATest[6722:207] Mozilla/5.0 (iPhone Simulator; U; CPU iPhone OS 4_1 like Mac OS X; en-us) AppleWebKit/532.9 (KHTML, like Gecko) Mobile/8B117
責(zé)任編輯：張葉青
來源：
eoe Android開發(fā)者社區(qū)
