UIView动画学习笔记

UIView的动画是通过修改控件的属性来达到动画的效果,如:渐变, 移动.

废话不多说,直接上代码:

 - (void)loadView{
     [super loadView];
     _leftView = [[UIView alloc]initWithFrame: CGRectMake(, , , )];
     _rightView = [[UIView alloc]initWithFrame: CGRectMake(, , , )];
     _leftView.backgroundColor = [UIColor grayColor];
     _rightView.backgroundColor = [UIColor grayColor];
     _btnStart = [UIButton buttonWithType:UIButtonTypeRoundedRect];
     _btnStart.frame = CGRectMake( /  -  / , , , );
     [_btnStart setTitle: @"startAnimation" forState:UIControlStateNormal];
     [_btnStart addTarget:self action:@selector(startAnimating)forControlEvents:UIControlEventTouchUpInside];

     [self.view addSubview: _leftView];
     [self.view addSubview: _rightView];
     [self.view addSubview: _btnStart];
     [_leftView release];
     [_rightView release];

     [self.navigationController setNavigationBarHidden: YES];
 }

 - (void)startAnimating{
     _leftView.alpha = 1.0;
     _rightView.alpha = 2.0;

     _btnStart.alpha = 1.0;
     _btnStart.transform = CGAffineTransformScale(_btnStart.transform, 1.0, 1.0);

     [UIView beginAnimations: nil context: nil];//标记UIView动画开始,第一个参数是给动画的名称定义一个名字,在多个动画需要逻辑处理的时候定义,一般简单的动画可以忽略;第二个参数是上下文,暂且忽略;
     [UIView setAnimationCurve: UIViewAnimationCurveEaseIn];//定义动画的曲线(动画的开始与结束的快慢),UIViewAnimationCurveEaseIn为默认类型;
     [UIView setAnimationDuration: 1.5];//定义动画的持续时间,数值越大动画时间越长,也就是所谓的动画越慢;

     [UIView setAnimationDelegate: self];//设置代理, 可以监听动画开始和结束时;
     [UIView setAnimationDidStopSelector:@selector(animationDidStop)];//动画结束时调用animationDidStop方法;
     /* 动画变化在这里修改 */
     CGRect lFrame =  _leftView.frame;
     CGRect rFrame = _rightView.frame;

     lFrame.origin.x = -;//通过改变x坐标达到做移动的效果
     rFrame.origin.x = ;

     _leftView.frame = lFrame;
     _rightView.frame = rFrame;

     _leftView.alpha = 0.1;//通过改变透明度达到渐变的效果
     _rightView.alpha = 0.1;

     _btnStart.alpha = 0.0;
     _btnStart.transform = CGAffineTransformScale(_btnStart.transform, 0.1, 0.1);//通过改变缩放比例达到动画效果
     /* 动画变化这里结束 */
     [UIView commitAnimations];//确认提交动画
 }

 - (void)animationDidStop{

     CAAnimationViewController *caAnimationVC = [[CAAnimationViewController alloc]init];//创建一个新的ViewController命名为CAAnimationViewController,为了下一节的笔记;
     [UIView beginAnimations: nil context:nil];//开始动画
     [UIView setAnimationDuration:0.5];//动画持续时间

     [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:self.navigationController.view cache: YES];//Transition 就是过渡的意思,
                                         //过渡方法:第一个参数是过渡动画类型,这里是右转动,枚举类型;
                                         //第二个参数是需要过渡的视图对象,也就是过渡页面的父类型,暂且这么记,下文有详细解释;
                                         //第三个参数是是否缓存,如果是YES，那么在开始和结束图片视图渲染一次并在动画中创建帧；否则，视图将会在每一帧都渲染。例如缓存，你不需要在视图转变中不停的更新，你只需要等到转换完成再去更新视图。
     [UIView commitAnimations];//提交动画
     [self.navigationController pushViewController: caAnimationVC animated: NO];//push页面
     [caAnimationVC release];

 }

关于setAnimationTransition第二个参数view,要传入过渡的父类, 做过渡的两个view是rootViewController和caAnimationVC,rootViewController的上一层(父类)是UINavigationContorller,所以传入的是self.navigationController.view.

源代码:http://vdisk.weibo.com/s/yV3nUa6epUv7x