错误：索引 1 超出范围 [0 .. 0]

Question

我是 Xcode 的菜鸟，我一直在使用 UITableViewController 显示此错误。

这是错误信息： * 由于未捕获的异常“NSRangeException”而终止应用程序，原因：“* -[__NSArrayM objectAtIndex:]: index 1 beyond bounds [0 .. 0]” * 首先抛出调用栈： （0x1c91012 0x10cee7e 0x1c330b4 0x36d0 0xc58d5 0xc5b3d 0xacce83 0x1c450376 0x1c4f440 0x1c36f44 0x1c3624 0x1c36e1b 0x1b7e3 0x1beb668 0x1665c 0x2132 0x2065） libc++abi.dylib：终止调用抛出异常 (lldb)

这是我的代码：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{


 if (indexPath.row == 0) {

    NSString *strURL = [NSString stringWithFormat:@"http://localhost:8888/GetDetail.php?choice=row0"];
    NSArray *arrayImagesNames = [[NSMutableArray alloc] initWithContentsOfURL:[NSURL URLWithString:strURL]];


    arrayDataFromServer2 = [[NSMutableArray alloc]init];

    NSEnumerator *enumForNames = [arrayImagesNames objectEnumerator];

    id objName;

    while ( objName = [enumForNames nextObject]) {
        [arrayDataFromServer2 addObject:[NSDictionary dictionaryWithObjectsAndKeys:objName, @"name", nil]];
    }

    NSString *nn = [[arrayDataFromServer2 objectAtIndex:indexPath.row] objectForKey:@"name"];

    row1 = [nn intValue];
    NSLog(@"%d", row1);

    CompanyProfileViewController *profile = [self.storyboard instantiateViewControllerWithIdentifier:@"Profile"];
    [self.navigationController pushViewController:profile animated:YES];

    profile.profileid = row1;
    NSLog(@"%d", profile.profileid);
}

if (indexPath.row == 1) {

    NSString *strURL = [NSString stringWithFormat:@"http://localhost:8888/GetDetail.php?choice=row1"];
    NSArray *arrayImagesNames = [[NSMutableArray alloc] initWithContentsOfURL:[NSURL URLWithString:strURL]];


    arrayDataFromServer2 = [[NSMutableArray alloc]init];

    NSEnumerator *enumForNames = [arrayImagesNames objectEnumerator];

    id objName;

    while (objName = [enumForNames nextObject]) {
        [arrayDataFromServer2 addObject:[NSDictionary dictionaryWithObjectsAndKeys:objName, @"name", nil]];
    }

    NSString *nn = [[arrayDataFromServer2 objectAtIndex:indexPath.row] objectForKey:@"name"];

    row1 = [nn intValue];
    NSLog(@"%d", row1);

    CompanyProfileViewController *profile = [self.storyboard instantiateViewControllerWithIdentifier:@"Profile"];
    [self.navigationController pushViewController:profile animated:YES];

    profile.profileid = row1;
    NSLog(@"%d", profile.profileid);
}

if (indexPath.row == 2) {

    NSString *strURL = [NSString stringWithFormat:@"http://localhost:8888/GetDetail.php?choice=row2"];
    NSArray *arrayImagesNames = [[NSMutableArray alloc] initWithContentsOfURL:[NSURL URLWithString:strURL]];


    arrayDataFromServer2 = [[NSMutableArray alloc]init];

    NSEnumerator *enumForNames = [arrayImagesNames objectEnumerator];

    id objName;

    while ( objName = [enumForNames nextObject]) {
        [arrayDataFromServer2 addObject:[NSDictionary dictionaryWithObjectsAndKeys:objName, @"name", nil]];
    }

    NSString *nn = [[arrayDataFromServer2 objectAtIndex:indexPath.row] objectForKey:@"name"];

    row1 = [nn intValue];
    NSLog(@"%d", row1);

    CompanyProfileViewController *profile = [self.storyboard instantiateViewControllerWithIdentifier:@"Profile"];
    [self.navigationController pushViewController:profile animated:YES];

    profile.profileid = row1;
    NSLog(@"%d", profile.profileid);
}

if (indexPath.row == 3) {

    NSString *strURL = [NSString stringWithFormat:@"http://localhost:8888/GetDetail.php?choice=row3"];
    NSArray *arrayImagesNames = [[NSMutableArray alloc] initWithContentsOfURL:[NSURL URLWithString:strURL]];


    arrayDataFromServer2 = [[NSMutableArray alloc]init];

    NSEnumerator *enumForNames = [arrayImagesNames objectEnumerator];

    id objName;

    while ( objName = [enumForNames nextObject]) {
        [arrayDataFromServer2 addObject:[NSDictionary dictionaryWithObjectsAndKeys:objName, @"name", nil]];
    }

    NSString *nn = [[arrayDataFromServer2 objectAtIndex:indexPath.row] objectForKey:@"name"];

    row1 = [nn intValue];
    NSLog(@"%d", row1);

    CompanyProfileViewController *profile = [self.storyboard instantiateViewControllerWithIdentifier:@"Profile"];
    [self.navigationController pushViewController:profile animated:YES];

    profile.profileid = row1;
    NSLog(@"%d", profile.profileid);
 }
}

当我单击第二个单元格 (index.row == 1) 时，会发生此错误。 我已经使用了断点并且错误就行了： "NSString *nn = [[arrayDataFromServer2 objectAtIndex:indexPath.row] objectForKey:@"name"];"

请帮忙！

Answer 1

斯威夫特 4

经过更多的时间，我得到了这个错误的爱? 当您使用情节提要中的 tableView 并在代码中实现时： 提示并比较： 在节数和 numberOfRowsInSection == 故事板和代码之间

 override func numberOfSections(in tableView: UITableView) -> Int {
        // #warning Incomplete implementation, return the number of sections
        return 3
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        // #warning Incomplete implementation, return the number of rows
        return 1
    }

Answer 2

您有一个数组，其中包含 0 或 1 个元素。现在你试图从中提取第二个元素，[0] 是第一个，[1] 是第二个。

编辑：

因为您不确定数组何时会包含 1 个或多个对象。因此，您可以用作：

NSString *nn=nil;
if([arrayDataFromServer2 count]>1){    
    nn = [[arrayDataFromServer2 objectAtIndex:indexPath.row] objectForKey:@"name"];
}