iPhone中的內存泄漏警告

Question

NSCFString類的對象0x3d58870在沒有池的情況下自動釋放-只是泄漏

我收到以下函數中幾乎所有變量的內存警告：

- (void) backgroundTask {

c= [array1 count];
if (c == 0){
    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"ERROR" message:@"Chose an image to upload!!!" delegate:nil cancelButtonTitle:@"OK!" otherButtonTitles:nil];
    [alert show];
    [alert release];
}
else {  
    for(k==0;k<c;k++){
        [uploading startAnimating];

        upload = [array1 objectAtIndex:0];
        NSData *imageData = UIImageJPEGRepresentation(upload, .9);      
        NSString *urlString = @"http://fileserver.colormailer.com/fileserver/photoService?method=addPhoto&description=testingupload&albumId=nithinalbum&userId=123nithin&sid=12345678&title=image125";

        NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
        [request setURL:[NSURL URLWithString:urlString]];
        [request setHTTPMethod:@"POST"];

        NSString *boundary = [NSString stringWithString:@"---------------------------14737809831466499882746641449"];
        NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
        [request addValue:contentType forHTTPHeaderField:@"Content-Type"];

        NSMutableData *body = [NSMutableData data];
        [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"userfile\"; filename=\".jpg\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[NSData dataWithData:imageData]];
        [body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
        [request setHTTPBody:body];

        msg = [[NSString alloc]initWithFormat:@"Upload number %d",a];
        NSLog(msg);
        NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
        NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];

        NSLog(returnString);
        a++;
        [returnString release];
        [array1 removeObjectAtIndex:0];

    }
    [uploading stopAnimating];
    if(c == 1){
        msg = [[NSString alloc]initWithFormat: @"1 image uploaded"];
    }
    else{
        msg = [[NSString alloc]initWithFormat: @"%d images uploaded",c];
    }
    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"upload success" message:msg delegate:nil cancelButtonTitle:@"OK!" otherButtonTitles:nil];
    [alert show];
    [msg release];
    [alert release];
}
}

我將此函數稱為：

- (IBAction)pushUpload {
    [self performSelectorInBackground:@selector(backgroundTask) withObject:nil];
}

當我直接在Action方法中使用前一個函數內部的任務時，沒有任何問題，但這是到了這一步。 前面的警告顯示在控制台中。 它們用於NSData ， NSString ， NSMutableArray ，以及我在此函數中啟動的所有內容。

Answer 1

如果要在后台線程中分配自動釋放的對象，則需要創建一個自動釋放池：

pool = [[NSAutoreleasePool alloc] init];

// Your code with autoreleased objects

[pool release]

Answer 2

您也應該刪除警報。 除main之外的任何線程的所有UI更改都將導致內存泄漏