iphone在使用tabbar时如何使用转换动画
今天参考《iphone3 开发基础教程》这本书的写了一个例子,用到了UITabBarController,但是发现一个问题,教程提供的例子里切换界面时没有动画效果,体验效果很不好。之前的例子在添加动画时,界面的跳转是由自己来实现的,类似下面的代码:
[yellowViewController.view removeFromSuperview]; CATransition* animation = [CATransition animation]; [animation setDuration:0.5f]; [animation setType:kCATransitionPush]; [animation setSubtype:kCATransitionFromRight]; [animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut]]; [[self.view layer]addAnimation:animation forKey:@"switchView"]; [self.view insertSubview:blueViewController.view atIndex:0];
将动画的代码放在两个界面切换的中间就行了。
但是这里界面切换的实现全部由UITabBarController,也就是系统自动帮你来实现了,要在哪里添加动画代码呢?
很简单,写一个类继承自UITabBarController,然后实现下面这个委托方法就行了:
-(void)tabBar:(UITabBar*)atabBar didSelectItem:(UITabBarItem*)item { CATransition* animation = [CATransition animation]; [animation setDuration:0.5f]; [animation setType:kCATransitionFade]; [animation setSubtype:kCATransitionFromRight]; [animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut]]; [[self.view layer]addAnimation:animation forKey:@"switchView"]; }
正儿八经学习iphone也有一周了,还停留在UI阶段,对OBJ-c的语法还是不太熟悉,果然还是我太懒了么XD?