ios UIViewController层级关系

最新推荐文章于 2021-05-06 11:20:35 发布

原创最新推荐文章于 2021-05-06 11:20:35 发布 · 617 阅读

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#ios UIViewController

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本文介绍了一个iOS应用中视图控制器切换的方法。通过设置选定的视图控制器索引，可以实现不同视图之间的平滑过渡。文章详细展示了如何利用UIKit框架中的方法来管理视图控制器的生命周期，包括添加、移除及更新视图。


- (void)setSelectedIndex:(NSUInteger)selectedIndex {
    if ([self selectedViewController]) {
        [[self selectedViewController] willMoveToParentViewController:nil];
        [[[self selectedViewController] view] removeFromSuperview];
        [[self selectedViewController] removeFromParentViewController];
    }

    _selectedIndex = selectedIndex;
    [[self tabBar] setSelectedItem:[[self tabBar] items][selectedIndex]];

    [self setSelectedViewController:[[self viewControllers] objectAtIndex:selectedIndex]];
    [self addChildViewController:[self selectedViewController]];
    [[[self selectedViewController] view] setFrame:[[self contentView][self contentView] addSubview:[[self selectedViewController] view]];
    [[self selectedViewController] didMoveToParentViewController:self];
}
//当一个视图控制器从视图控制器容器中被添加或者被删除之前，该方法被调用
UIViewController willMoveToParentViewController:
UIViewController removeFromParentViewController
UIViewController addChildViewController
UIViewController didMoveToParentViewController:;
    [[self contentView] addSubview:[[self selectedViewController][self selectedViewController] didMoveToParentViewController:self];
}
//当一个视图控制器从视图控制器容器中被添加或者被删除之前，该方法被调用
UIViewController willMoveToParentViewController:
UIViewController removeFromParentViewController
UIViewController addChildViewController
UIViewController didMoveToParentViewController:;
    [[self selectedViewController] didMoveToParentViewController:self];
}
//当一个视图控制器从视图控制器容器中被添加或者被删除之前，该方法被调用
UIViewController willMoveToParentViewController:
UIViewController removeFromParentViewController
UIViewController addChildViewController
UIViewController didMoveToParentViewController: