當UITabBar不是rootViewController時，如何以編程方式鏈接具有NIB的其他ViewControllers的UITabBar

Question

我有一個tableViewController，一旦在一個單元格上點擊它，便會將您FirstViewController FirstViewController。FirstViewController具有一個帶有4個項目的UITabBar。 我想以編程方式將每個按鈕/項目都掛接到我的項目中已經存在的viewController中。

我做了很多研究，但是還沒有找到解決這個問題的方法

到目前為止FirstViewController, SecondViewController, ThirdViewController, FourthViewController我所擁有的是FirstViewController, SecondViewController, ThirdViewController, FourthViewController

在FirstViewController.xib我具有帶有4個圖標的TabBar。

FirstViewController.h

@property (strong, nonatomic) IBOutlet UITabBarController *tabBarController;
@property (weak, nonatomic) IBOutlet UITabBarItem *tabBar;
@property (weak, nonatomic) IBOutlet UITabBarItem *firstItem;
@property (weak, nonatomic) IBOutlet UITabBarItem *secondItem;
@property (weak, nonatomic) IBOutlet UITabBarItem *thirdItem;
@property (weak, nonatomic) IBOutlet UITabBarItem *fourthItem;

FirstViewController.m

- (void)viewDidLoad {
    FirstViewController *first = [[FirstViewController alloc] init];
    SecondViewController *second = [[SecondViewController alloc] init];
    ThirdViewController *third = [[ThirdViewController alloc] init];
    FourthViewController *fourth = [[FourthViewController alloc] init];

    self.tabBarController.viewControllers = [NSArray arrayWithObject: first, second, third, fourth, nil];

}

當我在例如第四個按鈕選項卡不顯示此代碼不能正常工作fourthViewController筆尖

Answer 1

假設每個UIViewController子類都有一個關聯的.xib （nib），然后使用指定的初始化程序。

代替[[FirstViewController alloc] init]對每個相應的視圖控制器使用initWithNibName：bundle [[FirstViewController alloc] init]

例子-

[[FirstViewController alloc] initWithNibName:@"nameOfNibFile" bundle:nil];