iOS7 ViewController转场
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在iOS开发中,ViewController转场是用户界面交互的关键部分,特别是在iOS7及更高版本中,Apple引入了一系列新的特性和API,极大地丰富了视图控制器之间的切换效果。本篇将深入探讨"ViewController转场",主要关注系统视图控制器容器(如UINavigationController)中的push、pop、present和dismiss操作的动画效果。 1. **系统转场动画** iOS系统提供了默认的转场动画,如UINavigationController的pushViewController:animated:方法会执行一个从右向左滑动的push动画,而popViewControllerAnimated:则反之,从左向右滑出。对于模态呈现(present)和消失(dismiss),系统会执行淡入淡出或从下至上滑出的动画。 2. **自定义Push转场** 在iOS7中,Apple引入了UIViewControllerAnimatedTransitioning协议,允许开发者自定义转场动画。通过实现animateTransition:和transitionDuration:方法,我们可以创建独特的push效果。例如,可以设计一个从上至下滑动的转场,或者带有特殊视觉特效的转场,如缩放、旋转等。 3. **自定义Present和Dismiss** 类似地,若要自定义模态视图控制器的呈现和消失动画,我们需要实现UIViewControllerTransitioningDelegate协议,并设置modalPresentationStyle为UIModalPresentationCustom。然后,我们可以通过transitioningDelegate属性指定一个实现了UIViewControllerAnimatedTransitioning协议的对象来控制动画。 4. **互动转场** iOS7还引入了UIViewControllerInteractiveTransitioning接口,允许用户与转场动画进行交互。例如,用户可以滑动手势来提前结束一个模态视图的呈现或消失过程。这需要同时实现UIViewControllerAnimatedTransitioning和UIPercentDrivenInteractiveTransition协议。 5. **Container View Controller的使用** UINavigationController、UITabBarController和UIPageViewController都是苹果提供的容器视图控制器,它们可以帮助管理子视图控制器的转场。自定义这些容器的转场动画,需要理解其内部工作原理,并可能需要覆写某些方法,如UINavigationController的pushViewController:animated:completion:。 6. **CAAnimation和Core Animation** 要实现更复杂的动画效果,开发者可以利用Core Animation框架。CAAnimation类提供了多种动画类型,如CABasicAnimation和CAKeyframeAnimation,可以用于自定义视图控制器转场的每一个细节。 7. **Storyboard和Transition标识符** 在Storyboard中,可以为特定的Segue分配一个唯一标识符,然后在代码中通过这个标识符选择性地应用自定义转场动画。 8. **性能优化** 虽然自定义转场动画能够提升用户体验,但过度复杂的动画可能会对性能造成影响。因此,在设计转场动画时,应考虑其对设备性能的影响,尽量保持动画流畅且响应迅速。 通过以上知识点的学习和实践,开发者能够为iOS应用创建出独特且吸引人的视图控制器转场效果,提升用户体验,同时也能更好地掌握iOS系统视图控制器的容器机制。
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