0
回答
UIView动画简介
利用AWS快速构建适用于生产的无服务器应用程序,免费试用12个月>>>   

开发过程当为了让应用更绚,就加入一些动画效果。CoreAnimation比较复杂,其实UIView的简单动画就可以满足我们应用开发。UIView支持的动画属性有,frame, center, bounds,transform, alpha.  什么意思呢,就是你可以修改这些属性来完成动画,比如设置frame,uiview就可以动了。下面看一段代码:

    // begin the animations block:
    [UIView beginAnimations:@"animationID" context:NULL];

    // define how long the animation should take, in seconds. 0.5 is half a second.
    [UIView setAnimationDuration:3];

    // animate the view itself by changing its frame:
    [theView setFrame:newFrame];
    // or by changing its alpha value:
    [theView setAlpha:0.5];
    // or by rotating it:
    theView.transform = CGAffineTransformMakeRotation(-0.7853981625); // 45 deg

    // optional: to execute code after the animation has finished, set the delegate:    
    [UIView setAnimationDelegate:self];
    
    // optional: set the animation curve:
    //   UIViewAnimationCurveEaseIn: begins slowly, then speeds up
    //   UIViewAnimationCurveEaseOut: begins fast, then slows down
    //   UIViewAnimationCurveEaseInOut: begins slowly, faster in the middle, slows down at end
    //   UIViewAnimationCurveLinear: same speed throughout
    [UIView setAnimationCurve: UIViewAnimationCurveEaseOut];

    // start animating!
    [UIView commitAnimations];


这样就完成了一个动画效果, beginAnimatins:与commitAnimations这是必须写的,中间设置你的属性,这儿设置了三个属性,分别是frame,alpha,transform. 这样就完成了一个动画,那个"animationID"随便取名字。动画的时间有多长呢, 有一个默认时间,在这儿我们设置的是3秒, 动画有一个快慢,比如快进,setAnimationCurve就是控制什么时候快进,什么时候慢播。当这个动画完了的时候,会有一个delegate方法调用:

- (void)animationDidStop:(NSString *)animID finished:(BOOL)didFinish context:(void *)context 
{
    if ( [animID isEqualToString:@"animationID"] ) {
        NSLog(@"move10 animation finished.");
        [self moveBack];
    }
    else if ( [animID isEqualToString:@"moveBack"] ) {
        NSLog(@"done moving.");
    }
}

在这儿你可以检测到哪一个动画完了,比如在这儿我们检测到了animationID与moveBack.


是不是很简单呀?

在iOS4以上,支持block了,所以用它使编程将更简单,如传统的动画是这样:

[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.5];
[UIView setAnimationTransition:UIViewAnimationTransitionCurlDown 
                                      forView:containerView cache:YES];
 
[containerView addSubview:subview];
 
[UIView commitAnimations];

如果用block的方式将是:

[UIView transitionWithView:containerView duration:0.5
		options:UIViewAnimationOptionTransitionCurlDown
		animations:^ { [containerView addSubview:subview]; }
		completion:nil];

具体参看文档: http://developer.apple.com/library/ios/#documentation/uikit/reference/UIView_Class/UIView/UIView.html
 


原文链接:http://blog.csdn.net/favormm/article/details/6591504
<无标签>
举报
长平狐
发帖于5年前 0回/290阅
顶部