Question

创建了一个小的两个标签应用程序，然后将另一个视图控制器子类化以创建第三个标签。应用程序编译良好，没有警告。但是当我点击第三个选项卡时，应用程序崩溃了，我在主文件中收到了一条SIGABRT消息。

你能帮我找到错误吗？

TabBarFirstViewController.m

#import "TabBarFirstViewController.h"

@implementation TabBarFirstViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        self.title = NSLocalizedString(@"Screen One", @"Screen One");
        self.tabBarItem.image = [UIImage imageNamed:@"Screen One"];
    }
   return self;
}

TabBarSecondViewController.m

#import "TabBarSecondViewController.h"

@implementation TabBarSecondViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        self.title = NSLocalizedString(@"Screen Two", @"Screen Two");
        self.tabBarItem.image = [UIImage imageNamed:@"Screen Two"];
    }
   return self;

}

ThirdViewController.m

#import "ThirdViewController.h"

@implementation ThirdViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        self.title = NSLocalizedString(@"Screen Three",@"Screen Three");
        self.tabBarItem.image = [UIImage imageNamed:@"Screen Three"]; 
    }
   return self;

}

TabBarAppDelegate.m

#import "TabBarAppDelegate.h"

#import "TabBarFirstViewController.h"

#import "TabBarSecondViewController.h"

#import "ThirdViewController.h"

@implementation TabBarAppDelegate

@synthesize window = _window;
@synthesize tabBarController = _tabBarController;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:    (NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    UIViewController *viewController1 = [[TabBarFirstViewController alloc]     initWithNibName:@"TabBarFirstViewController" bundle:nil];
    UIViewController *viewController2 = [[TabBarSecondViewController alloc]     initWithNibName:@"TabBarSecondViewController" bundle:nil];
    UIViewController *viewController3 = [[ThirdViewController alloc]    initWithNibName:@"Third View Controller" bundle:nil];
    self.tabBarController = [[UITabBarController alloc] init];
    self.tabBarController.viewControllers = [NSArray arrayWithObjects:viewController1, viewController2, viewController3, nil];
    self.window.rootViewController = self.tabBarController;
    [self.window makeKeyAndVisible];
    return YES;
}

Main.m，错误消息已注释掉

#import <UIKit/UIKit.h>

#import "TabBarAppDelegate.h"

int main(int argc, char *argv[])
{
    @autoreleasepool {
        return UIApplicationMain(argc, argv, nil, NSStringFromClass([TabBarAppDelegate     class]));   /* Thread 1: Program received signal "SIGABRT" (appears only when clicked on    third tab) */
    }
}

Answer 1

这行代码不正确：

UIViewController *viewController3 = [[ThirdViewController alloc] initWithNibName:@"Third View Controller" bundle:nil];

我不知道您的NIB名称究竟是什么，您必须检查，但它不是“第三视图控制器”。也许是“ThirdViewController”？

单击第三个选项卡时选项卡应用程序崩溃

1 个答案: