iOS Programming: The Big Nerd Ranch Guide阅读笔记（7）
Setting a view controller as the rootViewController of a window adds that view controller’s view as a subview of the window (Figure 7.4). It also automatically resizes the view to be the same size as the window. Given what you learned in Chapter 6, you could write setRootViewController: yourself:
- (void)setRootViewController:(UIViewController *)vc {
// Get the view of the root view controller UIView *rootView = [vc view];
// Make a frame that fits the window‘s bounds CGRect viewFrame =
[self bounds];
[rootView setFrame:viewFrame];
// Insert this view as window‘s subview
[self addSubview:rootView]; }
(This method does are a few more things, but this is what we are interested in right now).
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