ios标签栏点击显示模态视图得到黑屏

Question

你好我想实现这个动画效果(使用 Storyboard)，当用户点击一个标签栏(比如第二个标签栏项目)时，它会像模态视图一样显示相应的 View (向上显示到屏幕)

我目前的方法是将标签栏 Controller 委托(delegate)给标签栏并重写

-(void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item{
    NSLog(@"rawr");
    NSLog(@"inside tab bar did select, index is %d", self.selectedIndex);

    if (item == [self.tabBar.items objectAtIndex:1]) {
        //item.title = @"modal view";
        NSLog(@"going to promote as modal view");
        CBTab2ViewController* modalViewController = [[CBTab2ViewController alloc] init];
        [self presentViewController:modalViewController animated:YES completion:nil];
    }
}

问题是，显示的 View 是黑屏，知道如何正确实现吗？

我的源代码可以在下面的链接中找到: https://www.dropbox.com/s/6rd6ek59xf0yiq4/testtabbar.zip

Answer 1

更改行:

CBTab2ViewController* modalViewController = [[CBTab2ViewController alloc] init];
[self presentViewController:modalViewController animated:YES completion:nil];

对于这个(如果你的 Storyboard名称是“MainStoryBoard”):

 UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"MainStoryboard"
                                                         bundle: nil];

CBTab2ViewController * modalViewController = (MyViewController*)[mainStoryboard 
                        instantiateViewControllerWithIdentifier: @"CBTab2ViewController"];

[self presentViewController:modalViewController animated:YES completion:nil];