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dispatch_asyncバックグラウンドアップロードに使用しています。dispatch_async別のStackoverflowの質問から、それがよりも優れていることがわかりましたPerformSelectorInBackground。しかし、私がそれを呼び出した後、UIは非常に遅くなります。誰かがこれに対する解決策を提供できますか？私が使用したコードは以下に追加されています：

__block NSString *someString;
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 
                                         (unsigned long)NULL), ^(void) {

  if(someString != nil)
    {
        Class *className = [class sharedObject];
        [className sendContacts];

    }

});

機能コード：

-(void) sendContacts {

    NSURL *url = [NSURL URLWithString:@"myurl"];

    ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];
    [request setRequestMethod:@"POST"];

    [request addRequestHeader:@"d" value:[[UIDevice currentDevice] uniqueIdentifier]];

    NSString *sessionKey = [[NSUserDefaults standardUserDefaults]valueForKey:@"UD_Sessionkey"];

    [request addRequestHeader:@"s" value:sessionKey];

    NSData *data=[[self createContactList] dataUsingEncoding: [NSString defaultCStringEncoding] ];

    NSMutableData *x = [[NSMutableData alloc] init]; 
    [x setData:data];

    [request setPostBody:x];

    [request setShouldContinueWhenAppEntersBackground:YES];
    [request setDelegate:self];
    [request setTimeOutSeconds:60];
    [request setDidFinishSelector:@selector(requestFinished:)];
    [request setDidFailSelector:@selector(requestFailed:)];
    [request startAsynchronous];

}


- (void)requestFinished:(ASIHTTPRequest *)requestData
{

    NSLog(@"Response : %@", [requestData responseString]);

    if (self.currentLimit_ > totalCount) {

        //do nothing
    } else {

        [self sendContacts];
    }


}

- (NSString *)createContactList
{

    self.currentLimit_ = self.currentLimit_ + 10;
    self.currentCount_ = self.currentCount_ + 1;

    ABAddressBookRef addressBook = ABAddressBookCreate();
    CFArrayRef allPeople = ABAddressBookCopyArrayOfAllPeople(addressBook);
    CFIndex nPeople = ABAddressBookGetPersonCount(addressBook);

    totalCount = nPeople;

    NSMutableString *requestContactsString = [[NSMutableString alloc] init];


    [requestContactsString appendString:@"<list>"];

    for (int i=currentCount; i<self.currentLimit_; i++)
    {
        NSLog(@"Started : %d", i);
        if (self.currentLimit_ > totalCount) {
            break;
        }

        if (i < self.currentLimit_ - 10) {

            continue;
        }

        ABRecordRef ref = CFArrayGetValueAtIndex(allPeople, i);
        CFTypeRef firstName = ABRecordCopyValue(ref, kABPersonFirstNameProperty);
        CFTypeRef lastName = ABRecordCopyValue(ref, kABPersonLastNameProperty);
        CFTypeRef email = ABRecordCopyValue(ref, kABPersonEmailProperty);
        CFTypeRef phone = ABRecordCopyValue(ref, kABPersonPhoneProperty);

        //requestContactsString = [requestContactsString stringByAppendingFormat:@"<item>"];
        [requestContactsString appendString:@"<item>"];

        if(firstName)
        {
            [requestContactsString appendString:[NSString stringWithFormat:@"<firstname>%@</firstname>", firstName]];

            CFRelease(firstName);
            firstName = nil;
        }
        if(lastName)


            [requestContactsString appendString:[NSString stringWithFormat:@"<lastname>%@</lastname>", lastName]];
            CFRelease(lastName);
            lastName = nil;
        }
        if(email)
        {
            if(ABMultiValueGetCount(email)>0)
            {
                CFTypeRef em = ABMultiValueCopyValueAtIndex(email, 0);

                [requestContactsString appendString:[NSString stringWithFormat:@"<email>%@</email>", em]];

                CFRelease(em);
            }
            CFRelease(email);
            email = nil;
        }
        if(phone)
        {
            if(ABMultiValueGetCount(phone)>0)
            {
                CFTypeRef ph = ABMultiValueCopyValueAtIndex(phone, 0);

                [requestContactsString appendString:[NSString stringWithFormat:@"<phone>%@</phone>", ph]];
                CFRelease(ph);
            }
            CFRelease(phone);
            phone = nil;
        }

        [requestContactsString appendString:@"</item>"];

    }



    if(allPeople)
    {
        CFRelease(allPeople);
        allPeople = nil;
    }
    if(addressBook)
    {
        CFRelease(addressBook);
        addressBook = nil;
    }

    [requestContactsString appendString:@"</list>"];

    NSString *hashedContactsString = [self generateHashedPassword:requestContactsString];

    NSLog(@"Contacts : %@", requestContactsString);

    //contact list has changed
    if(![[[NSUserDefaults standardUserDefaults] valueForKey:@"contacts"] isEqualToString:hashedContactsString])
    {
        return requestContactsString;
    }
    else return nil;
}
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1 に答える 1

2

自動解放されたオブジェクトの速度が低下している可能性があります...機能がより多くの時間を費やしているインストルメント ツールでチェックする必要があります。

//Can you try using autoreleasepool for the threaded function. 
     dispatch_async(yourQueue, ^{
                     @autoreleasepool {
                         //Your code to be run in background
                         dispatch_async(dispatch_get_main_queue(), ^{
                             //Any UI updates
                         });
                     }
                 });
于 2012-07-09T07:02:25.450 に答える