我正在创建一个没有情节提要的应用,从用户单击表格视图单元格到该单元格的详细信息视图,我遇到了麻烦。

在创建和处理表格视图的类中,我具有以下代码:

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    PersonDetailViewController *detailViewController;
    Person *person = [self.playerArray objectAtIndex:indexPath.row];
    detailViewController.person = person;
    [[self navigationController] pushViewController:detailViewController animated:YES];

}


因此,我尝试将详细信息视图控制器推到屏幕上,然后在该详细信息屏幕上显示用户信息。我试图找到一种解决方案,但是,我遇到的大多数答案都使用情节提要,而我没有使用情节提要。

在我的PersonDetailViewController.m类中,我有以下代码:

#import "PersonDetailViewController.h"

@interface PersonDetailViewController ()

@end

@implementation PersonDetailViewController

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

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.personInfo = [[UITextField alloc] initWithFrame:CGRectMake(45, 30, 200, 40)];
    _personInfo.backgroundColor = [UIColor whiteColor];


}

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

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end


我不确定这是否是造成此问题的原因,但是在我的代表中,我有以下几点:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    self.window.backgroundColor = [UIColor whiteColor];
    self.tableViewController = [[TableViewController alloc]init];
    UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:self.tableViewController];
    self.window.rootViewController = nav;
    [self.window makeKeyAndVisible];
    return YES;
}


我当时在想,这可能与创建导航控制器有关,但是我一直在玩它,但我认为它并没有。

最佳答案

您错过了tableView:didSelectRowAtIndexPath:方法中视图控制器的初始化

PersonDetailViewController *detailViewController = [[PersonDetailViewController alloc] init]; // or initWith...

关于ios - 应用程序尝试将nil View Controller 插入目标,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/24940335/

10-11 00:26