iPhone UITabBar - 如何切换选项卡视图？

Question

您能告诉我切换选项卡视图是如何工作的吗？因为在我的“sendPressed”和“cancelPressed”方法中，我试图从第二个选项卡视图切换到第一个选项卡视图。然而，截至目前，我在“[[array objectAtIndex:2] setSelectedSegmentIndex:1]”行上收到错误。

#import "SecondViewController.h"

@implementation SecondViewController

- (IBAction) sendPressed:(UIButton *)sender
{
    array = [[self tabBarController] viewControllers];
    [[array objectAtIndex:2] setSelectedSegmentIndex:1];
    [[self tabBarController] setViewControllers:array];
}

- (IBAction) cancelPressed:(UIButton *)sender
{
    array = [[self tabBarController] viewControllers];
    [[array objectAtIndex:2] setSelectedSegmentIndex:1];
    [[self tabBarController] setViewControllers:array];

}

- (void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    image = [info objectForKey:UIImagePickerControllerOriginalImage];
    imageView.image = image;
    [self dismissModalViewControllerAnimated:YES];
}

...
@end

Answer 1

将该行替换为：

self.tabBarController.selectedIndex = 1;

选项卡索引从 0 开始。因此索引 0 将是第一个选项卡，索引 1 将是第二个选项卡，依此类推。

Answer 2

尝试

self.tabBarController.selectedIndex = 0; //first tab

Answer 3

你为什么不直接使用

self.tabBarController.selectedIndex = 0;   // for first tab


// 1 for second tab
// 2 for third tab .....