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?

posted @ 2010-09-07 16:13  李小盆  阅读(1514)  评论(0编辑  收藏  举报