iOS在UIWebView之间切换导致内存警告

您好，我已经创建了一个自定义选项卡栏，根据您当前在操作队列中加载的选项卡隐藏和显示某些web视图，然后根据所选选项卡使它们可见和不可见。问题是它的加载和滚动速度太慢了，我收到了一个内存警告

这是我到目前为止所做的

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    NSArray *subviews = [cell subviews];
        for(UIView *subview in subviews) if([subview tag] == 4) [subview removeFromSuperview];

        UIView *loadingView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 800)];
        UIView *sendingMessage = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
        UIActivityIndicatorView *sendingSpinner = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(25, 15, 50, 50)];
        UILabel *sendingLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 65, 100, 20)];

        int sendingViewLeft = (loadingView.frame.size.width/2) - (sendingMessage.frame.size.width/2);
        int sendingViewTop = 160 - (sendingMessage.frame.size.height/2);

        loadingView.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.5];

        sendingMessage.frame = CGRectMake(sendingViewLeft, sendingViewTop, sendingMessage.frame.size.width, sendingMessage.frame.size.height);
        sendingMessage.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.5];
        sendingMessage.layer.cornerRadius = 10;

        sendingSpinner.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;

        sendingLabel.textColor = [UIColor whiteColor];
        sendingLabel.backgroundColor = [UIColor clearColor];
        sendingLabel.text = @"Loading...";
        sendingLabel.textAlignment = UITextAlignmentCenter;
        sendingLabel.font = [UIFont boldSystemFontOfSize:12];
        sendingLabel.shadowColor = [UIColor blackColor];
        sendingLabel.shadowOffset = CGSizeMake(0, -1);

        [sendingSpinner startAnimating];
        [sendingMessage addSubview:sendingLabel];
        [sendingMessage addSubview:sendingSpinner];
        [loadingView addSubview:sendingMessage];

        [loadingView setTag:4];

       cell.textLabel.text = @"";


    if([self.webViewStatus isEqualToString:@"FALSE"]){
        [cell addSubview:loadingView];
        self.tableView.userInteractionEnabled = NO;
    } else {
        [cell addSubview:self.fixturesWebView];
        [cell addSubview:self.resultsWebView];
        [cell addSubview:self.tablesWebView];
        self.tableView.userInteractionEnabled = YES;
    }


    if(self.selectedTabNumber == 1){
        self.fixturesWebView.alpha = 1;
        self.resultsWebView.alpha = 0;
        self.tablesWebView.alpha = 0;
    }

    if(self.selectedTabNumber == 2){
        self.fixturesWebView.alpha = 0;
        self.resultsWebView.alpha = 1;
        self.tablesWebView.alpha = 0;
    }

    if(self.selectedTabNumber == 3){
        self.fixturesWebView.alpha = 0;
        self.resultsWebView.alpha = 0;
        self.tablesWebView.alpha = 1;

    }

    return cell;
}

---

首先，您应该考虑创建一个自定义单元格，而不是在TabelVIEW DATABOCE中创建它。第二，当您获得WebVIEW内容时，考虑使用异步调用来避免锁定。这也可以在一个街区内完成。如果在自定义单元格上编写委托方法，则可以让tableview知道何时加载或不加载对象等

---

但是，当tableview需要绘制单元格时，您似乎让它做了太多的工作。

这里的问题到底是什么？