本文介绍了一个方便的方法，用于将当前窗口设置为前台显示的主要窗口，并提供了如何使用隐藏属性来实现窗口隐藏与显示的操作指南。
makeKeyAndVisible
Makes the receiver the key window and makes that window visible.
- (void)makeKeyAndVisible
Discussion
This is a convenience method to make the receiver the main window and displays it in front of other windows. You can also hide and reveal a window using the inheritedhidden UIView property.
Availability
- Available in iPhone OS 2.0 and later.
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