iOS动画效果和实现

动画效果提供了状态或页面转换时流畅的用户体验，在iOS系统中，咱们不需要自己编写绘制动画的代码，Core Animation提供了丰富的api来实现你需要的动画效果。

    UIKit只用UIView来展示动画,动画支持UIView下面的这些属性改变：

 

• frame  
• bounds  
• center  
• transform  
• alpha 
• backgroundColor 
• contentStretch

 

1、commitAnimations方式使用UIView动画

- (void)viewDidLoad
{
    [super viewDidLoad];

    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];

    [button setTitle:@"改变" forState:UIControlStateNormal];
    button.frame = CGRectMake(10, 10, 60, 40);
    [button addTarget:self action:@selector(changeUIView) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];

}

- (void)changeUIView{
    [UIView beginAnimations:@"animation" context:nil];
    [UIView setAnimationDuration:1.0f];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
    [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:self.view cache:YES];
    [UIView commitAnimations];
 }

下面是点击改变后的效果（两种）：

 

动画的常量有一下四种

UIViewAnimationTransitionNone,
UIViewAnimationTransitionFlipFromLeft,
UIViewAnimationTransitionFlipFromRight,
UIViewAnimationTransitionCurlUp,
UIViewAnimationTransitionCurlDown,

1.2 交换本视图控制器中2个view位置

 [self.view exchangeSubviewAtIndex:1 withSubviewAtIndex:0];

先添加两个view ,一个redview  一个yellowview

 

- (void)viewDidLoad
{
    [super viewDidLoad];
    UIView *redView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    redView.backgroundColor = [UIColor redColor];
    [self.view addSubview:redView];

    UIView *yellowView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    yellowView.backgroundColor = [UIColor yellowColor];
    [self.view addSubview:yellowView];

    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [button setTitle:@"改变" forState:UIControlStateNormal];
    button.frame = CGRectMake(10, 10, 300, 40);
    [button addTarget:self action:@selector(changeUIView) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];

    UIButton *button1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [button1 setTitle:@"改变1" forState:UIControlStateNormal];
    button1.frame = CGRectMake(10, 60, 300, 40);
    [button1 addTarget:self action:@selector(changeUIView1) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button1];

}

- (void)changeUIView1{
    [UIView beginAnimations:@"animation" context:nil];
    [UIView setAnimationDuration:1.0f];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
    [UIView setAnimationTransition:UIViewAnimationTransitionCurlDown forView:self.view cache:YES];
    //  交换本视图控制器中2个view位置
    [self.view exchangeSubviewAtIndex:1 withSubviewAtIndex:0];
    [UIView commitAnimations];
}

 

这样看起来就像两页一样了。

1.3 、   [UIView setAnimationDidStopSelector:@selector(animationFinish:)];

在commitAnimations消息之前，可以设置动画完成后的回调，设置方法是：

    [UIView setAnimationDidStopSelector:@selector(animationFinish:)];

 

2、使用：CATransition

- (void)changeUIView2{
    CATransition *transition = [CATransition animation];
    transition.duration = 2.0f;
      transition.type = kCATransitionPush;
    transition.subtype = kCATransitionFromTop;
    [self.view exchangeSubviewAtIndex:1 withSubviewAtIndex:0];
    [self.view.layer addAnimation:transition forKey:@"animation"];
}

transition.type 的类型可以有

淡化、推挤、揭开、覆盖

NSString * const kCATransitionFade;

NSString * const kCATransitionMoveIn;

NSString * const kCATransitionPush;

NSString * const kCATransitionReveal;

这四种，

transition.subtype 

也有四种

NSString * const kCATransitionFromRight;

NSString * const kCATransitionFromLeft;

NSString * const kCATransitionFromTop;

NSString * const kCATransitionFromBottom;

 

2.2 私有的类型的动画类型：

立方体、吸收、翻转、波纹、翻页、反翻页、镜头开、镜头关

animation.type = @"cube"
animation.type = @"suckEffect";
animation.type = @"oglFlip";//不管subType is "fromLeft" or "fromRight",official只有一种效果
animation.type = @"rippleEffect";
animation.type = @"pageCurl";
animation.type = @"pageUnCurl"
animation.type = @"cameraIrisHollowOpen ";
animation.type = @"cameraIrisHollowClose ";

下图是第一个cube立方体的效果：

2.3 CATransition的 startProgress  endProgress属性

这两个属性是float类型的。
可以控制动画进行的过程，可以让动画停留在某个动画点上，值在0.0到1.0之间。endProgress要大于等于startProgress。

比如上面的立方体转到，可以设置endProgress= 0.5，让动画停留在转动一般的位置。

上面这些私有的动画效果，在实际应用中要谨慎使用。因为在app store审核时可能会以为这些动画效果而拒绝通过。

 

 

3、UIView的 + (void)animateWithDuration

:(NSTimeInterval)duration animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion

方法。

这个方法是在iOS4.0之后才支持的。

比 1 里的UIView的方法简洁方便使用。

DidView里添加moveView。

moveView = [[UIView alloc] initWithFrame:CGRectMake(10, 180, 200, 40)];
moveView.backgroundColor = [UIColor blackColor];
[self.view addSubview:moveView];

 

- (void)changeUIView3{
    [UIView animateWithDuration:3 animations:^(void){
        moveView.frame = CGRectMake(10, 270, 200, 40);
    }completion:^(BOOL finished){
        UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(20, 20, 40, 40)];
        label.backgroundColor = [UIColor blackColor];
        [self.view addSubview:label];
    }];
}

然后用UIView animateWithDuration动画移动，移动动画完毕后添加一个Label。

3.2、 animateWithDuration的嵌套使用

- (void)changeUIView3{


    [UIView animateWithDuration:2
                          delay:0
                        options:UIViewAnimationOptionCurveEaseOut animations:^(void){
        moveView.alpha = 0.0;
    }completion:^(BOOL finished){
        [UIView animateWithDuration:1
                              delay:1.0
                            options:UIViewAnimationOptionAutoreverse | UIViewAnimationOptionRepeat
                         animations:^(void){
                             [UIView setAnimationRepeatCount:2.5];
                             moveView.alpha = 1.0;
                         }completion:^(BOOL finished){

                         }];

    }];
}

这个嵌套的效果是先把view变成透明，在从透明变成不透明，重复2.5次透明到不透明的效果。

文中例子的代码：AnimateDemo