使用NSMutableArray时出现“超出界限”错误

Question

拼命寻找原因，当我在tableView中选择一个单元格时，然后在单元格突出显示应用程序崩溃时上下滚动表格。如果我选择“艺术和博物馆”或“咖啡和面包店”作为例子，它会给我-[__NSArrayM objectAtIndex:]: index 6 beyond bounds [0 .. 2]错误。这两个类别都包含3个值，因此我会得到[0 .. 2]，但我不明白它为什么会发生。当我在控制台中看到应用程序加载时，共创建了10个单元格中的6个（每个类别1个）。发生错误时，编译器会突出显示此行：cell.textLabel.text = [arrayNo objectAtIndex:indexPath.row];以下代码...

@interface PreViewController ()

{
    NSMutableArray *arrayNo;
}

@end

@implementation PreViewController

-(void)viewDidAppear:(BOOL)animated
{

NSString *arts = @"Arts and Museums";
NSString *coffee = @"Coffee and Bakeries";
NSString *tours = @"Tours and Festivals";
NSString *hotels = @"Hotels and Inns";
NSString *leisure = @"Leisure and Recreation";
NSString *music = @"Live Music";
NSString *bars = @"Night Clubs and Bars";
NSString *food = @"Restaurants";
NSString *shopping = @"Shopping";
NSString *transportation = @"Transportation";

[arrayNo addObject:arts];
[arrayNo addObject:coffee];
[arrayNo addObject:tours];
[arrayNo addObject:hotels];
[arrayNo addObject:leisure];
[arrayNo addObject:music];
[arrayNo addObject:bars];
[arrayNo addObject:food];
[arrayNo addObject:shopping];
[arrayNo addObject:transportation];


    [[self myTableView] reloadData];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    arrayNo = [[NSMutableArray alloc] init];
    [[self myTableView] setDelegate:self];
    [[self myTableView] setDataSource:self];
}

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [arrayNo count];
}

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

    if (!cell)
    {
        NSLog(@"CREATING NEW CELL");
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
        cell.textLabel.textColor = [UIColor whiteColor];
        cell.textLabel.textAlignment = NSTextAlignmentCenter;
        cell.textLabel.textColor = [UIColor colorWithRed:(100/255.0) green:(130/255.0) blue:(255/255.0) alpha:1.0];
    }

    cell.textLabel.text = [arrayNo objectAtIndex:indexPath.row];

    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];

if (cell)
{
    UITapGestureRecognizer *tapped = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(reLoad)];
    tapped.numberOfTapsRequired = 1;
    [cell addGestureRecognizer:tapped];
}

if ([cell.textLabel.text isEqualToString: @"Arts and Museums"])
{        
    NSString *galleries = @"Art Galleries";
    NSString *dramatic = @"Dramatic Arts";
    NSString *museums = @"Museums";

    [arrayNo removeAllObjects];

    [arrayNo addObject:galleries];
    [arrayNo addObject:dramatic];
    [arrayNo addObject:museums];
}

if ([cell.textLabel.text isEqualToString: @"Coffee and Bakeries"])
{
    NSString *bakeries = @"Bakeries";
    NSString *cafes = @"Cafés";
    NSString *shops = @"Coffee Shops";

    [arrayNo removeAllObjects];

    [arrayNo addObject:bakeries];
    [arrayNo addObject:cafes];
    [arrayNo addObject:shops];
}
if ([cell.textLabel.text isEqualToString: @"Tours and Festivals"])
{
    NSString *festivals = @"Food and Drink Festivals";

    [arrayNo removeAllObjects];

    [arrayNo addObject:festivals];        
}
if ([cell.textLabel.text isEqualToString: @"Hotels and Inns"])
{
    NSString *breakfasts = @"Bed and Breakfasts";
    NSString *hotels = @"Hotels";
    NSString *inns = @"Inns";
    NSString *motels = @"Motels";

    [arrayNo removeAllObjects];

    [arrayNo addObject:breakfasts];
    [arrayNo addObject:hotels];
    [arrayNo addObject:inns];
    [arrayNo addObject:motels];
}
if ([cell.textLabel.text isEqualToString: @"Leisure and Recreation"])
{
    NSString *arcades = @"Arcades";
    NSString *beaches = @"Beaches";
    NSString *bowling = @"Bowling";
    NSString *breweries = @"Breweries";
    NSString *campgrounds = @"Campgrounds";
    NSString *cinemas = @"Cinemas";
    NSString *climbing = @"Climbing";
    NSString *parks = @"Parks";
    NSString *ski = @"Ski Resorts";
    NSString *spa = @"Spa Resorts";
    NSString *water = @"Water Rentals";

    [arrayNo removeAllObjects];

    [arrayNo addObject:arcades];
    [arrayNo addObject:beaches];
    [arrayNo addObject:bowling];
    [arrayNo addObject:breweries];
    [arrayNo addObject:campgrounds];
    [arrayNo addObject:cinemas];
    [arrayNo addObject:climbing];
    [arrayNo addObject:parks];
    [arrayNo addObject:ski];
    [arrayNo addObject:spa];
    [arrayNo addObject:water];
}
if ([cell.textLabel.text isEqualToString: @"Live Music"])
{
    NSString *bars = @"Bars";
    NSString *clubs = @"Clubs";
    NSString *restaurants = @"Restaurants";
    NSString *theaters = @"Theaters";

    [arrayNo removeAllObjects];

    [arrayNo addObject:bars];
    [arrayNo addObject:clubs];
    [arrayNo addObject:restaurants];
    [arrayNo addObject:theaters];
}
if ([cell.textLabel.text isEqualToString: @"Night Clubs and Bars"])
{
    NSString *bars = @"Bars";
    NSString *lounges = @"Lounges";
    NSString *clubs = @"Night Clubs";

    [arrayNo removeAllObjects];

    [arrayNo addObject:bars];
    [arrayNo addObject:lounges];
    [arrayNo addObject:clubs];
}
if ([cell.textLabel.text isEqualToString: @"Restaurants"])
{
    NSString *asian = @"Asian";
    NSString *fast = @"Fast Food";
    NSString *french = @"French";
    NSString *german = @"German";
    NSString *grill = @"Grill and Variety";
    NSString *indian = @"Indian";
    NSString *italian = @"Italian";
    NSString *mexican = @"Mexican";
    NSString *eastern = @"Middle Eastern";
    NSString *seafood = @"Seafood";

    [arrayNo removeAllObjects];

    [arrayNo addObject:asian];
    [arrayNo addObject:fast];
    [arrayNo addObject:french];
    [arrayNo addObject:german];
    [arrayNo addObject:grill];
    [arrayNo addObject:indian];
    [arrayNo addObject:italian];
    [arrayNo addObject:mexican];
    [arrayNo addObject:eastern];
    [arrayNo addObject:seafood];
}
if ([cell.textLabel.text isEqualToString: @"Shopping"])
{
    NSString *art = @"Art Supplies";
    NSString *books = @"Books";
    NSString *candy = @"Candy";
    NSString *cooking = @"Cooking";
    NSString *electronics = @"Electronics";
    NSString *apparel = @"Apparel";
    NSString *florists = @"Florists";
    NSString *grocery = @"Grocery";
    NSString *health = @"Health";
    NSString *home = @"Home";
    NSString *jewlery = @"Jewelry";
    NSString *music = @"Music";
    NSString *outdoor = @"Outdoor Gear";
    NSString *photography = @"Photography";
    NSString *souvenirs = @"Souvenirs";
    NSString *sports = @"Sports";

    [arrayNo removeAllObjects];

    [arrayNo addObject:apparel];
    [arrayNo addObject:art];
    [arrayNo addObject:books];
    [arrayNo addObject:candy];
    [arrayNo addObject:cooking];
    [arrayNo addObject:electronics];
    [arrayNo addObject:florists];
    [arrayNo addObject:grocery];
    [arrayNo addObject:health];
    [arrayNo addObject:home];
    [arrayNo addObject:jewlery];
    [arrayNo addObject:music];
    [arrayNo addObject:outdoor];
    [arrayNo addObject:photography];
    [arrayNo addObject:souvenirs];
    [arrayNo addObject:sports];
}
if ([cell.textLabel.text isEqualToString: @"Transportation"])
{
    NSString *airports = @"Airports";
    NSString *bicycle = @"Bicycle Rentals";
    NSString *bus = @"Bus Lines";
    NSString *ferries = @"Ferries";
    NSString *taxis = @"Taxis";
    NSString *trains = @"Trains";
    NSString *rentals = @"Vehicle Rentals";

    [arrayNo removeAllObjects];

    [arrayNo addObject:airports];
    [arrayNo addObject:bicycle];
    [arrayNo addObject:bus];
    [arrayNo addObject:ferries];
    [arrayNo addObject:taxis];
    [arrayNo addObject:trains];
    [arrayNo addObject:rentals];
}

}

- (void) reLoad
{
    [self.myTableView reloadData];
}

Answer 1

如果我猜测..我会说摆脱GestureRecognizer，只是在你改变了数组的内容后再做一个reloadData，作为didSelectRowAtIndexPath方法的最后一个声明。问题可能是因为reloadData永远不会及时调用，表认为它仍然包含10行，因为没有对numberOfRowsInSection进行新的调用。

必须分配GestureRecognizers＆amp;在做出手势之前添加，并且您不需要具有表格单元格的手势，因为您有didSelectRowAtIndexPath。