iOS 之动画效果和实现

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

[cpp] view
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- (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

[cpp] view
plaincopy

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

[cpp] view
plaincopy

- (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];

}

[cpp] view
plaincopy

- (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

[cpp] view
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- (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

[cpp] view
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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。

[cpp] view
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moveView = [[UIView alloc] initWithFrame:CGRectMake(10, 180, 200, 40)];

moveView.backgroundColor = [UIColor blackColor];

[self.view addSubview:moveView];

[cpp] view
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- (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

[cpp] view
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- (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

容芳志 (http://blog.csdn.net/totogo2010)

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