Objective-C 使用滑动切换标签

Question

我遵循了当用户在屏幕上向左/向右滑动时切换选项卡的代码。问题是当我切换到其他选项卡时，选项卡栏消失了。

我尝试推送一个 navigationController，但它抛出一个错误，指出它不受支持。

代码如下：

- (void)viewDidLoad {
    [super viewDidLoad];
    UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeRight:)];
    swipeLeft.direction = UISwipeGestureRecognizerDirectionLeft;
    [self.view addGestureRecognizer:swipeLeft];
    swipeLeft.delegate = self;

    UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeRight:)];
    swipeRight.direction = UISwipeGestureRecognizerDirectionRight;
    [self.view addGestureRecognizer:swipeRight];
    swipeRight.delegate = self;
}

-(void) swipeRight:(UISwipeGestureRecognizer *) recognizer {
    if (recognizer.direction == UISwipeGestureRecognizerDirectionRight){
        //NSLog(@"swipe right");
        NSString * storyboardName = @"Main";
        UIStoryboard *storyboard = [UIStoryboard storyboardWithName:storyboardName bundle: nil];
        UIViewController * vc = [storyboard instantiateViewControllerWithIdentifier:@"RecentsController"];
        [self presentViewController:vc animated:YES completion:nil];

    }
}

-(void) swipeLeft:(UISwipeGestureRecognizer *) recognizer {
    if (recognizer.direction == UISwipeGestureRecognizerDirectionRight)
        NSLog(@"Swipe left");
    NSString * storyboardName = @"Main";
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:storyboardName bundle: nil];
    UIViewController * vc = [storyboard instantiateViewControllerWithIdentifier:@"SettingsController"];
    [self presentModalViewController:vc animated:YES];
}

Answer 1

你做错了。要通过 code 切换标签栏，您无需推送新的 ViewController，它会替换现有的。

为此，您可以使用以下方法之一：

self.tabBarController.selectedIndex = i;

或

[self.tabBarController setSelectedIndex:i];

**** 其中 i 是您要显示的 ViewController 的 index。

Objective-C 使用滑动切换标签

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