私はiPhoneを初めて使用しますが、
私は現在iPhoneアプリを開発しており、URLからファイルをダウンロードする機能を実装しています。UIWebViewを作成しました。ユーザーがのダウンロードリンクをクリックするとwebview、ダウンロードが開始され、そのファイルがドキュメントディレクトリの指定されたフォルダに保存されます。これはすべて正常に機能していSecond Viewます。
しかし、この後、戻るボタンを押して自分に移動するとFirst view、アプリがクラッシュします...EXC_BAD_ACCESS
-(void)viewWillAppear:(BOOL)animated{
//Doing some operation and it works fine...
NSLog(@"viewWillAppear in First View.......");
}
-(void)viewDidAppear:(BOOL)animated{
NSLog(@"viewDidAppear in First View.......");
}
Log戻るボタンを押すと上記が表示されますが、1秒または0.5秒後にアプリがクラッシュします。
これが私のコードですSecond View、
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[receivedData setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data1
{
[receivedData appendData:data1];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSLog(@"Succeeded! Received %d bytes of data",[receivedData length]);
DirPath=[self applicationDocumentsDirectory];
NSLog(@"DirPath=%@",DirPath);
[receivedData writeToFile:DirPath atomically:YES];
UIAlertView* Alert = [[UIAlertView alloc] initWithTitle:@"Download Complete !"
message:nil delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles:nil];
[Alert show];
[Alert release];
// release the connection, and the data object
[connection release];
[receivedData release];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error1
{
[connection release];
[receivedData release];
// inform the user
NSLog(@"Connection failed! Error - %@ %@",
[error1 localizedDescription],
[[error1 userInfo] objectForKey:NSURLErrorFailingURLStringErrorKey]);
}
- (BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType {
url = [request URL];
//CAPTURE USER LINK-CLICK.
DirPath=[self applicationDocumentsDirectory];
Durl=[[url absoluteString]copy];
//Checking for Duplicate .FILE at downloaded path....
BOOL success =[[NSFileManager defaultManager] fileExistsAtPath:path];
lastPath=[[url lastPathComponent] copy];
if (success) //if duplicate file found...
{
UIAlertView* Alert = [[UIAlertView alloc] initWithTitle:@"This FILE is already present in Library."
message:@"Do you want to Downlaod again ?" delegate:self
cancelButtonTitle:nil
otherButtonTitles:@"Yes",@"No",nil];
[Alert show];
[Alert release];
}
else //if duplicate file not found directly start download...
{
// Create the request.
NSURLRequest *theRequest=[NSURLRequest requestWithURL:[NSURL URLWithString:Durl]
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:60.0];
// create the connection with the request and start loading the data
NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
if (theConnection) {
// Create the NSMutableData to hold the received data.
receivedData = [[NSMutableData data] retain];
} else {
NSLog(@"Inform the user that the connection failed.");
}
return YES;
}
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (buttonIndex == 0)
{
// Create the request.
NSURLRequest *theRequest1=[NSURLRequest requestWithURL:[NSURL URLWithString:Durl]
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:60.0];
// create the connection with the request and start loading the data
NSURLConnection *theConnection1=[[NSURLConnection alloc] initWithRequest:theRequest1 delegate:self];
if (theConnection1) {
// Create the NSMutableData to hold the received data.
receivedData = [[NSMutableData data] retain];
} else {
NSLog(@"Inform the user that the connection failed.");
}
}
else
{[alertView dismissWithClickedButtonIndex:1 animated:TRUE];}
}
- (void)webView:(UIWebView *)webview didFailLoadWithError:(NSError *)error1 {
NSLog(@"didFailLoadWithError: %@; stillLoading:%@", error1,(webview.loading?@"NO":@"YES"));
}
私のログは示しています：didFailLoadWithError: Error Domain=WebKitErrorDomain Code=102 "Frame load interrupted" UserInfo=0x6b34910 {NSErrorFailingURLKey=MY_URL, NSErrorFailingURLStringKey=MY_URL, NSLocalizedDescription=Frame load interrupted}; stillLoading:YES
DirPath=/Users/krunal/Library/Application Support/iPhone Simulator/5.0/Applications/FCDDDE83-A9B3-4C14-A56C-E8C5FCE7F5C4/Documents/DownloadedFile.epub
どんな助けでも適用されます。