- (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] bounds]]; [[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:
ios UIViewController层级关系
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转载自geniuswxk.iteye.com/blog/2184883
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