奇怪的滚动问题( UIScrollView )

Question

我已经在这上面找了无数次也没有结果，希望有人能帮上忙！

我在UIView的左半部分有一个加载自定义单元格/子视图的UIScrollView。UIView是UINavigation堆栈的一部分，也被加载到TabBar上的选项卡中。

发生的情况是，如果我启动应用程序并立即开始滚动，它会非常流畅。然而，如果我启动应用程序并等待5-10秒，UIScrollView就会变得非常迟缓和不稳定(并且一直如此)。我会认为这可能是内存泄漏或其他什么，但我似乎找不到任何东西。

其中包含了将自定义单元格/子视图加载到UIScrollView中的视图的代码。单元格子视图中没有任何自定义代码。哦，而且只有8-10个项目:每个项目都有一个小的(150x150)图像和3个文本字段-都是不透明的。

    #import "ProductListViewController.h"
    #import "ProductListLeftItemViewController.h"


    @implementation ProductListViewController

    @synthesize listScroll;



    - (void)viewDidLoad {

        NSBundle *bundle = [NSBundle mainBundle];
        NSString *path = [bundle pathForResource:@"Products" ofType:@"plist"];
        NSArray *products = [[NSArray alloc] initWithContentsOfFile:path];
        //  
        int numProducts;
        numProducts = [products count];
        [listScroll setContentSize:CGSizeMake(500, (numProducts * 111))];
        for (int i = 0; i < numProducts; i++) {
            ProductListLeftItemViewController *cellItem = [[ProductListLeftItemViewController alloc] initWithNibName:@"ProductListLeftItem" bundle:nil];
            cellItem.view.frame = CGRectMake(0, (i*111), 500, 111);

            [self.listScroll addSubview:cellItem.view];
            cellItem = nil;
            [cellItem release];
        }
        [products release]; 

        [super viewDidLoad];

    }

    - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
        return (interfaceOrientation == UIInterfaceOrientationLandscapeRight);
    }

    - (void)didReceiveMemoryWarning {
        // Releases the view if it doesn't have a superview.
        NSLog(@"Memory warning, ProductListViewController");

        [super didReceiveMemoryWarning];

        // Release any cached data, images, etc that aren't in use.
    }

    - (void)viewDidUnload {
        // Release any retained subviews of the main view.
        // e.g. self.myOutlet = nil;
    }


    - (void)dealloc {
        [listScroll release];
        [super dealloc];
    }

    @end

按照要求，ProductListLeftItemViewController代码如下：

#import "ProductListLeftItemViewController.h"


@implementation ProductListLeftItemViewController

@synthesize titleTxt, descriptionTxt, modelTxt, productThumb;


 // The designated initializer.  Override if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.
/*
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization.
    }
    return self;
}
*/

/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView {
}
*/

/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [super viewDidLoad];
}
*/


- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    return YES;
}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}


- (void)viewDidUnload {
    titleTxt = nil;
    descriptionTxt = nil;
    modelTxt = nil;
    productThumb = nil;


    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}


- (void)dealloc {
    [titleTxt release];
    [descriptionTxt release];
    [modelTxt release];
    [productThumb release];
    [super dealloc];
}


@end

Answer 1

对于将来遇到这个问题的任何人来说，一旦我开始在实际设备上测试，一切都非常顺利。也许这只是模拟器的怪异之处？我会认为这个问题已经解决了，尽管我还会进一步研究它。