iphone使用自定义单元格滚动tableview太慢 [英] iphone Scrolling of tableview with custom cells is too slow

问题描述

在iPhone上部署应用程序时遇到了这个问题，在模拟器上未检测到。

I have this problem when deploying my application on iphone, which wasn't detected on the simulator.

这是cellforrow的代码...

this the code of the cellforrow...

    - (UITableViewCell *)tableView:(UITableView *)tv cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

    NSLog(@"beginning cellforRowAtIndexPath for section %d, and cell %d",[indexPath indexAtPosition:0],[indexPath indexAtPosition:1]);

    static NSString *MyIdentifier = @"MyIdentifier";
    NSString *fieldTitle;
    NSString*fieldDescription;
    [_stopWatch start];
    [PersonalSection GetField:&fieldTitle AndValue:&fieldDescription UsingIndexPath:indexPath AndPersonalInformation:_personalInfo];


    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier];
    if (cell == nil) {
        [[NSBundle mainBundle] loadNibNamed:@"ViewContent" owner:self options:nil];
        cell = tvCell;
        self.tvCell=nil;

        ((UILabel*) [cell.contentView viewWithTag:1]).layer.cornerRadius=11;
        ((UILabel*) [cell.contentView viewWithTag:2]).layer.cornerRadius=11;
    }


    UILabel*mainLabel=(UILabel*) [cell.contentView viewWithTag:1];
    mainLabel.text=fieldTitle;
    //mainLabel.textColor = [UIColor colorWithRed:0.745 green:0.116 blue:0.176 alpha:1.0];

    UILabel*detailLabel=(UILabel*)[cell.contentView viewWithTag:2];
    detailLabel.text=fieldDescription;
    [_stopWatch stop];
    NSLog(@"---------End cellforRowAtIndexPath");

    return cell;
}

其余部分用于返回，就像返回3或5一样，这里没有真正的瓶颈。
，所以我想知道是什么让它变慢了。
现在获取 [PersonalSection GetField：& fieldTitle ...的数据相当快，它占用了iPhone最多0.1 ms的时间。问题出在别的地方，我猜想有一种优化此代码的方法，我想知道自定义单元格的影响，它只是具有与此ViewController链接的带有标签和文本字段的单元格。
任何想法。

the rest is for sections and it's like return 3 or 5 no real bottleneck there. so i'm wondering what's slowing it so much. now the data fetching "[PersonalSection GetField:&fieldTitle..." is rather fast, it takes on the iphone maximum 0.1 ms. The problem is somewhere else, i'm guessing there's a way for optimizing this code, and i'm wondering about the custom cell influence it's only a cell with label and textfield linked to this ViewController. Any ideas.

推荐答案

好吧，主要的性能问题是围绕contentview子视图的角落。
使用QuartzCore：

Ok, the main performance issue was rounding the corners of the subviews of the contentview. using QuartzCore:

#import <QuartzCore/QuartzCore.h>
((UILabel*) [cell.contentView viewWithTag:1]).layer.cornerRadius=11;

我删除了这些控件，并减小了控件的大小以适合分区表的单元格。现在它们看上去很圆，但是文本字段和标签却没有。
这已经明显改善了我的滚动性能。
谢谢大家的帮助。

I removed those and decreased the sizes of the controls to fit inside the cell of a sectioned table. and now they look round but the textfield and label are not. this has fixed my scrolling performance noticeably. Thank you all for your help.

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