考虑查看NSURLConnection
及其委托方法。您可以使用这些来检查下载的状态。
@interface
...
NSURLConnection *connectionInProgress;
NSData *googleRequestResponseData;
NSURL *googleURL;
...
@implementation
...
- (void) setUpRequest {
googleURL = [[NSURL URLWithString:@"http://www.google.com/"] retain];
googleRequestResponseData = [[NSMutableData data] retain];
NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReturnCacheDataElseLoad timeoutInterval:30.0];
connectionInProgress = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES];
}
#pragma mark NSURLConnection delegate methods
- (void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[googleRequestResponseData appendData:data];
}
- (void) connectionDidFinishLoading:(NSURLConnection *)connection {
[web_screen loadData:googleRequestResponseData MIMEType:@"application/octet-stream" textEncodingName:@"utf-8" baseURL:googleURL];
NSString *js_result = [web_screen stringByEvaluatingJavaScriptFromString:@"document.getElementsByTagName('input')[1].value='test';"];
NSLog (js_result);
[googleURL release];
[googleRequestResponseData release];
[connectionInProgress release];
connectionInProgress = nil;
}
- (void) connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
NSLog (@"Connection failed to load data from Google!");
[googleURL release];
[googleRequestResponseData release];
[connectionInProgress release];
connectionInProgress = nil;
}
备选地,检查了本科普塞的ASIHTTPRequest包装,其包括一种简化的方法以异步下载(参见ASINetworkQueue
,特定地)。
请求下载完成后,您可以使用ASINetworkQueue
运行您选择的方法(例如,运行Javascript代码)。
这绝对是问题所在。 – 2010-06-02 18:21:03