在QTMovieView上面添加视图

原创于 2012-09-21 16:02:18 发布 · 854 阅读

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本文详细介绍了如何通过Apple官方提供的代码实现QTMovieView的文本和图形叠加动画效果。首先创建一个新的窗口并添加子视图用于绘制图像和执行动画。然后将新的overlay窗口作为QTMovieView窗口的子窗口添加，设置其优先级位于电影窗口之上。后续在overlay窗口子视图中的绘制操作会覆盖在QTMovieView窗口之上，从而实现预期的叠加效果。此外，文章还强调了在使用此技术时需要注意的技术更新，推荐使用Core Animation层支持的QTMovieView替代方法。

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可以查看苹果官方提供的代码：https://developer.apple.com/library/mac/#samplecode/Movie_Overlay/Introduction/Intro.html

This sample shows how to overlay text & graphics and perform animation on an QTMovieView through a floating "overlay" window. This is accomplished by first creating a new window and adding subviews to this window. These subviews are used to draw the images and perform the animation. The new overlay window is then added as a child window to the QTMovieView window with the NSWindowAbove ordering so it will be ordered on top of the movie window. Any subsequent drawing in the overlay window subviews will then draw on top of the QTMovieView window, giving the overlay effect we desire.

*IMPORTANT*

While this technique is good for overlaying text & graphics on top of a QTMovieView, with Mac OS X 10.5 Leopard the recommended technique is to instead use a Core Animation layer-backed QTMovieView. For more information, see the Core Animation documentation.

Also, the following sample code is available:

Core Animation QuickTime Layer
http://developer.apple.com/samplecode/CoreAnimationQuickTimeLayer/index.html

MyMovieFilter
http://developer.apple.com/samplecode/MyMovieFilter/