关于苹果的动画支持类，可叹其强大，性能以及 动画效果惊人。膜拜啊！
转场动画就是从一个场景以动画的形式过渡到另一个场景。转场动画的使用一般分为以下几个步骤：
1.创建转场动
2.设置转场类型、子类型（可选）及其他属性画
3.设置转场后的新视图并添加动画到图层
下表列出了常用的转场类型(注意私有API是苹果官方没有公开的动画类型，但是目前通过仍然可以使用)：
| 动画类型 | 说明 | 对应常量 | 是否支持方向设置 |
|---|---|---|---|
| 公开API | |||
| fade | 淡出效果 | kCATransitionFade | 是 |
| movein | 新视图移动到旧视图上 | kCATransitionMoveIn | 是 |
| push | 新视图推出旧视图 | kCATransitionPush | 是 |
| reveal | 移开旧视图显示新视图 | kCATransitionReveal | 是 |
| 私有API | 私有API只能通过字符串访问 | ||
| cube | 立方体翻转效果 | 无 | 是 |
| oglFlip | 翻转效果 | 无 | 是 |
| suckEffect | 收缩效果 | 无 | 否 |
| rippleEffect | 水滴波纹效果 | 无 | 否 |
| pageCurl | 向上翻页效果 | 无 | 是 |
| pageUnCurl | 向下翻页效果 | 无 | 是 |
| cameralIrisHollowOpen | 摄像头打开效果 | 无 | 否 |
| cameraIrisHollowClose | 摄像头关闭效果 | 无 | 否 |
另外对于支持方向设置的动画类型还包含子类型：
| 动画子类型 | 说明 |
|---|---|
| kCATransitionFromRight | 从右侧转场 |
| kCATransitionFromLeft | 从左侧转场 |
| kCATransitionFromTop | 从顶部转场 |
| kCATransitionFromBottom | 从底部转场 |
//添加手势
UISwipeGestureRecognizer *leftSwipeGesture=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(leftSwipe:)];
leftSwipeGesture.direction=UISwipeGestureRecognizerDirectionLeft;
[self.view addGestureRecognizer:leftSwipeGesture];
UISwipeGestureRecognizer *rightSwipeGesture=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(rightSwipe:)];
rightSwipeGesture.direction=UISwipeGestureRecognizerDirectionRight;
[self.view addGestureRecognizer:rightSwipeGesture];
UISwipeGestureRecognizer *topSwipeGesture=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(topSwipe:)];
topSwipeGesture.direction=UISwipeGestureRecognizerDirectionUp;
[self.view addGestureRecognizer:topSwipeGesture];
UISwipeGestureRecognizer *bottomSwipeGesture=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(bottomSwipe:)];
bottomSwipeGesture.direction=UISwipeGestureRecognizerDirectionDown;
[self.view addGestureRecognizer:bottomSwipeGesture];
#pragma mark 向左滑动浏览下一张图片
-(void)leftSwipe:(UISwipeGestureRecognizer *)gesture{
[self transitionAnimation:1];
}
#pragma mark 向右滑动浏览上一张图片
-(void)rightSwipe:(UISwipeGestureRecognizer *)gesture{
[self transitionAnimation:2];
}
-(void)topSwipe:(UISwipeGestureRecognizer *)gesture{
[self transitionAnimation:3];
}
-(void)bottomSwipe:(UISwipeGestureRecognizer *)gesture{
[self transitionAnimation:4];
}
#pragma mark 转场动画
-(void)transitionAnimation:(NSInteger)direction{
//1.创建转场动画对象
CATransition *transition=[[CATransition alloc]init];
//2.设置动画类型,注意对于苹果官方没公开的动画类型只能使用字符串，并没有对应的常量定义
transition.type=@"rippleEffect";
BOOL bl = YES;
//设置子类型
if (direction == 1) {
transition.subtype=kCATransitionFromRight;
bl = YES;
}else if (direction == 2) {
transition.subtype=kCATransitionFromLeft;
bl = NO;
}else if (direction == 3) {
transition.subtype=kCATransitionFromTop;
bl = YES;
}else{
transition.subtype=kCATransitionFromBottom;
bl = NO;
}
//设置动画时常
transition.duration=1.0f;
//3.设置转场后的新视图添加转场动画
if (bl) {
currentIndex=(currentIndex+1)%IMAGE_COUNT;
}else{
currentIndex=(currentIndex-1+IMAGE_COUNT)%IMAGE_COUNT;
}
NSString *imageName=[NSString stringWithFormat:@"%d",(int)currentIndex];
_imageView.image = [UIImage imageNamed:imageName];
[_imageView.layer addAnimation:transition forKey:@"KCTransitionAnimation1"];
}
或者用UIView动画来实现转场：
#pragma mark 转场动画
-(void)transitionAnimation:(BOOL)isNext{
UIViewAnimationOptions option;
if (isNext) {
option=UIViewAnimationOptionCurveLinear|UIViewAnimationOptionTransitionFlipFromRight;
}else{
option=UIViewAnimationOptionCurveLinear|UIViewAnimationOptionTransitionFlipFromLeft;
}
[UIView transitionWithView:_imageView duration:1.0 options:option animations:^{
_imageView.image=[self getImage:isNext];
} completion:nil];
}
老规矩，效果图如下：
