我完全卡住了。我一直在四处寻找答案，似乎每个人对每个“嵌套推送动画可能导致导航栏损坏”错误都有不同的问题。

请记住，我正在尝试自学如何为 iOS 7 编码。因此，如果我的某些编码方法不理想，我很抱歉，请提供反馈。无论如何，我正在创建一个 Pokemon Trading Card Game Pokedex 应用程序，它显示最新系列的卡片。除了我在主屏幕上选择第一个表格单元格 (XY Flash Fire) 之外，一切都运行良好。它将显示正确的表格数据，但导航栏标题不正确。当我选择一行时，它也不会转到 PokedexDetailViewController。

同样，主屏幕上的所有其他表格单元格都可以正常工作。我还尝试了人们在此处和 github 上发布的其他修复程序和类，但没有一个对我有用。我还重新创建了整个 FlashFireViewController，但仍然有同样的问题。确保所有代码与其他工作 View Controller 几乎相同。还验证了 segues 来自 Set View Controller，反对单元格。然而，一旦它在 Flash Fire View Controller 中，segues 就从单元格开始。

还不能发布图片，所以这里是我的屏幕截图的相册链接:http://imgur.com/a/Dq9py

1. 我的 Storyboard是如何设置的。
2. 应用启动后的主屏幕。
3. 当我选择第二个单元格 (XY) 时。
4. 当我选择 Mega Venusaur EX 时。
5. **错误。当我选择第一个单元格(XY Flash Fire)时。它显示了正确的表格数据，但不是正确的导航标题。
6. 当我选择 Butterfree 或任何其他 pokemon 时，没有任何反应，导航标题也消失了。此外，一旦我反击，应用程序就会崩溃并停止。

这是主屏幕类 TCGSetViewController.m 的代码。

@interface TCGSetViewController ()

@end

@implementation TCGSetViewController{



 NSArray *thumbnailCell;
}

@synthesize tableView = _tableView;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    thumbnailCell = [NSArray arrayWithObjects:@"XYFlashFire.png", @"XYBaseSet.png", @"BWLegendaryTreasures", @"BWPlasmaBlast.png", @"BWPlasmaFreeze.png", @"BWPlasmaStorm.png", nil];

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{

    return [thumbnailCell count];


}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 61;
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *simpleTableIdentifier = @"PokemonSetCell";

    TCGSetCell *cell = [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];

    if (cell == nil) {
        cell = [[TCGSetCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:simpleTableIdentifier];
    }

    cell.setImage.image = [UIImage imageNamed:[thumbnailCell objectAtIndex:indexPath.row]];

    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Conditionally perform segues, here is an example:
    if (indexPath.row == 0)
    {
        [self performSegueWithIdentifier:@"showFlashFireSet" sender:self];
    }
    if (indexPath.row == 1)
    {
        [self performSegueWithIdentifier:@"showXYBaseSet" sender:self];
    }
    else
    {
        [self performSegueWithIdentifier:@"showLegendarySet" sender:self];
    }
}

这里是 FlashFireViewController.m 的代码，它是第一个表格单元格。

@interface FlashFireViewController ()

@end

@implementation FlashFireViewController{

    NSArray *pokemons;
    NSArray *searchResults;
}

@synthesize tableView = _tableView;

- (void)viewDidLoad
{
    [super viewDidLoad];


    Pokemon *caterpie = [Pokemon new];
    caterpie.name = @"Caterpie";
    caterpie.hitPoints = @"40 HP";
    caterpie.setNumber = @"1/106";
    caterpie.imageFile = @"1-caterpie.jpg";
    caterpie.rarity = @"COMMON";

    Pokemon *metapod = [Pokemon new];
    metapod.name = @"Metapod";
    metapod.hitPoints = @"70 HP";
    metapod.setNumber = @"2/106";
    metapod.imageFile = @"2-metapod.jpg";
    metapod.rarity = @"UNCOMMON";

    Pokemon *butterfree = [Pokemon new];
    butterfree.name = @"Butterfree";
    butterfree.hitPoints = @"130 HP";
    butterfree.setNumber = @"3/106";
    butterfree.imageFile = @"3-butterfree.jpg";
    butterfree.rarity = @"RARE";

    Pokemon *pineco = [Pokemon new];
    pineco.name = @"Pineco";
    pineco.hitPoints = @"60 HP";
    pineco.setNumber = @"4/106";
    pineco.imageFile = @"4-pineco.jpg";
    pineco.rarity = @"COMMON";

    Pokemon *seedot = [Pokemon new];
    seedot.name = @"Seedot";
    seedot.hitPoints = @"50 HP";
    seedot.setNumber = @"5/106";
    seedot.imageFile = @"5-seedot.jpg";
    seedot.rarity = @"COMMON";

    Pokemon *nuzleaf = [Pokemon new];
    nuzleaf.name = @"Nuzleaf";
    nuzleaf.hitPoints = @"80 HP";
    nuzleaf.setNumber = @"6/106";
    nuzleaf.imageFile = @"6-nuzleaf.jpg";
    nuzleaf.rarity = @"UNCOMMON";

    Pokemon *shiftry = [Pokemon new];
    shiftry.name = @"Shiftry";
    shiftry.hitPoints = @"140 HP";
    shiftry.setNumber = @"7/106";
    shiftry.imageFile = @"7-shiftry.jpg";
    shiftry.rarity = @"RARE";

    Pokemon *roselia = [Pokemon new];
    roselia.name = @"Roselia";
    roselia.hitPoints = @"60 HP";
    roselia.setNumber = @"8/106";
    roselia.imageFile = @"8-roselia.jpg";
    roselia.rarity = @"COMMON";

    Pokemon *roserade = [Pokemon new];
    roserade.name = @"Roserade";
    roserade.hitPoints = @"90 HP";
    roserade.setNumber = @"9/106";
    roserade.imageFile = @"9-roserade.jpg";
    roserade.rarity = @"UNCOMMON";

    Pokemon *maractus = [Pokemon new];
    maractus.name = @"Maractus";
    maractus.hitPoints = @"90 HP";
    maractus.setNumber = @"10/106";
    maractus.imageFile = @"10-maractus.jpg";
    maractus.rarity = @"UNCOMMON";

    pokemons = [NSArray arrayWithObjects:caterpie, metapod, butterfree, pineco, seedot, nuzleaf, shiftry, roselia, roserade, maractus, nil];

}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    if (tableView == self.searchDisplayController.searchResultsTableView) {
        return [searchResults count];

    } else {
        return [pokemons count];
    }
}


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

    static NSString *pokemonTableIdentifier = @"PokemonTableCell";

    TCGPokedexCell *cell = (TCGPokedexCell *)[self.tableView dequeueReusableCellWithIdentifier:pokemonTableIdentifier];

    if (cell == nil)
    {
        cell = [[TCGPokedexCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:pokemonTableIdentifier];
    }


    Pokemon *pokemon = [pokemons objectAtIndex:indexPath.row];
    if (tableView == self.searchDisplayController.searchResultsTableView) {
        pokemon = [searchResults objectAtIndex:indexPath.row];
    } else {
        pokemon = [pokemons objectAtIndex:indexPath.row];
    }
    cell.pokemonLabel.text = pokemon.name;
    cell.pokemonNum.text = pokemon.setNumber;
    cell.thumbnailImageView.image = [UIImage imageNamed:pokemon.imageFile];
    cell.pokemonHP.text = pokemon.hitPoints;
    cell.pokemonRarity.text = pokemon.rarity;

    return cell;

}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 61;
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    if ([segue.identifier isEqualToString:@"showPokedexDetail"]) {
        NSIndexPath *indexPath = nil;
        Pokemon *pokemon = nil;

        if (self.searchDisplayController.active) {
            indexPath = [self.searchDisplayController.searchResultsTableView indexPathForSelectedRow];
            pokemon = [searchResults objectAtIndex:indexPath.row];
        } else {
            indexPath = [self.tableView indexPathForSelectedRow];
            pokemon = [pokemons objectAtIndex:indexPath.row];
        }

        PokedexDetailViewController *destViewController = segue.destinationViewController;
        destViewController.pokemon = pokemon;
    }
}

- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
{
    NSPredicate *resultPredicate = [NSPredicate predicateWithFormat:@"name contains[c] %@", searchText];
    searchResults = [pokemons filteredArrayUsingPredicate:resultPredicate];
}

-(BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
{
    [self filterContentForSearchText:searchString
                               scope:[[self.searchDisplayController.searchBar scopeButtonTitles]
                                      objectAtIndex:[self.searchDisplayController.searchBar
                                                     selectedScopeButtonIndex]]];

    return YES;
}



@end

这是我得到的确切错误代码:

2014-07-08 12:38:18.409 TCG Pokedex[37666:60b] nested push animation can result in corrupted navigation bar
2014-07-08 12:38:18.849 TCG Pokedex[37666:60b] Finishing up a navigation transition in an unexpected state. Navigation Bar subview tree might get corrupted.
2014-07-08 12:38:22.222 TCG Pokedex[37666:60b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Can't add self as subview'
*** First throw call stack:

最佳答案

您的问题很可能在 TCGSetViewController.m 的 tableView:didSelectRowAtIndexPath 中。

您有一个 if 语句，后跟一个 if else 语句。当 indexPath.row == 0 第一个 if 为真时，执行 [self performSegueWithIdentifier:@"showFlashFireSet"sender:self]。但是随后代码继续执行到 if else block 中。那里有两个单独的执行 block 。由于 indexPath.row 仍然是 0，我们将进入 else block ，并执行另一个 segue。

您很可能希望将其结构化为

if (indexPath.row == 0)
{
    [self performSegueWithIdentifier:@"showFlashFireSet" sender:self];
}
else if (indexPath.row == 1) // notice the else on this line
{
    [self performSegueWithIdentifier:@"showXYBaseSet" sender:self];
}
else
{
    [self performSegueWithIdentifier:@"showLegendarySet" sender:self];
}

更好的是，将其放在 switch 语句中:

NSString *segueID = nil;
switch (indexPath.row) {
    case 0:
        segueID = @"showFlashFireSet";
        break;
    case 1:
        segueID = @"showXYBaseSet";
        break;
    default:
        segueID = @"showLegendarySet";
        break;
}
[self performSegueWithIdentifier:segueID sender:self];

P.S.:更多评论

从 iOS 5 或 6 或 7 或其他系统开始，dequeueReusableCellWithIdentifier:forIndexPath: 保证返回有效单元格，因此无需检查 cell == nil调用该方法后(假设您不针对旧的 iOS 版本)。

不过，我看到您只是在调用 dequeueReusableCellWithIdentifier:，这确实有可能返回 nil。但是您在发布的代码中两次调用该方法，并且两次都在具有可用的 indexPath 的 tableView 数据源方法中调用，因此请利用它并删除那些 if (cell == nil) 检查；这是解放。

关于ios - 获取 "nested push animation can result in corrupted navigation bar"，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/24640835/