[英]UIWebView - how to extract the HTML code from webpages like Facebook?
我有一個源代碼示例,該源代碼以編程方式設置HTML中字段的值。
源代碼部分如下:
- (void)viewDidLoad
{
[super viewDidLoad];
myWebView.delegate = self;
//---formulate the HTML string---
NSString *str = [[[NSString alloc] initWithString:
@"<html>"
" <body>"
" <h1>The fields below are filled in programmatically</h1>"
" <input id='username' value='UserName' />"
" <input id='password' value='Password' type='password' />"
" </body>"
"</html>"
] autorelease];
//---load the UIWebView with the html string---
[myWebView loadHTMLString:str baseURL:nil];
}
//---wait for the UIWebView to finish loading---
- (void)webViewDidFinishLoad:(UIWebView *)webView {
//---access the 2 fields in the HTML---
[myWebView stringByEvaluatingJavaScriptFromString:@"document.getElementById('username').value='Wei-Meng Lee';"];
[myWebView stringByEvaluatingJavaScriptFromString:@"document.getElementById('password').value='TopSecret';"];
}
我想以編程方式在像Facebook這樣的實際網頁中設置字段的值,而不是像上面這樣編寫的自定義HTML。
如何將“ str”替換為實際網頁的html源代碼,以便可以選擇“ ElementbyId”?
通過替換
//---formulate the HTML string---
NSString *str = [[[NSString alloc] initWithString:
@"<html>"
" <body>"
" <h1>The fields below are filled in programmatically</h1>"
" <input id='username' value='UserName' />"
" <input id='password' value='Password' type='password' />"
" </body>"
"</html>"
] autorelease];
//---load the UIWebView with the html string---
[myWebView loadHTMLString:str baseURL:nil];
與[UIWebView loadRequest]
,它將使用URL加載Web視圖,並且UIWebView將包含HTML以使stringByEvaluatingJavaScriptFromString
起作用。
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