Core Animation 是iOS中一个比较重要的框架,许多炫酷动画和效果都可以用Core Animation 来实现,下面我们先简单的认识了解下Core Animation.
认识 Core Animation
在QuartzCore这个framwork 中提供了一下这些类
在Core Animation中提供了一个基本类 CAAnimation 通过查看文档我们可以看到一些方法和属性
@interface CAAnimation : NSObject
{@private void *_attr;
uint32_t _flags;
}
/* Creates a new animation object. */
+ (instancetype)animation;
/* Animations implement the same property model as defined by CALayer. * See CALayer.h for more details. */
+ (nullable id)defaultValueForKey:(NSString *)key;
- (BOOL)shouldArchiveValueForKey:(NSString *)key;
/* A timing function defining the pacing of the animation. Defaults to * nil indicating linear pacing. */
@property(nullable, strong) CAMediaTimingFunction *timingFunction;
/* The delegate of the animation. This object is retained for the * lifetime of the animation object. Defaults to nil. See below for the * supported delegate methods. */
@property(nullable, strong) id delegate;
/* When true, the animation is removed from the render tree once its
* active duration has passed. Defaults to YES. */
@property(getter=isRemovedOnCompletion) BOOL removedOnCompletion;
@end
这个类是最基本的抽象类 ,主要提供了创建类方法 ,动画执行方法 以及是否在执行完成后移除等.
我们常用到的动画主要涉及到以下几个类
CABasicAnimation、CAKeyframeAnimation、CATransition、CAAnimationGroup 、CASpringAnimation
在文档往下继续查看 我们能看到更多的类,多层次继承关系
CAPropertyAnimation : CAAnimation
CABasicAnimation : CAPropertyAnimation
CAKeyframeAnimation : CAPropertyAnimation
CASpringAnimation : CABasicAnimation
CAAnimationGroup : CAAnimation
CATransition : CAAnimation
1 CABasicAnimation 的使用
改变透明度
- (IBAction)baseClick:(id)sender {
CABasicAnimation* animation=[CABasicAnimation animationWithKeyPath:@"opacity"];
animation.fromValue=[NSNumber numberWithFloat:1.0];
animation.toValue=[NSNumber numberWithFloat:0.00];
//默认是NO YES 表示重复循环
animation.autoreverses=YES;
animation.duration=1;
animation.repeatCount=10;//重复次数
animation.removedOnCompletion=NO;//执行完成后是否移除
animation.fillMode=kCAFillModeForwards;//效果可选择
/** Timing function names.
CA_EXTERN NSString * const kCAMediaTimingFunctionLinear
CA_AVAILABLE_STARTING (10.5, 2.0, 9.0, 2.0);
CA_EXTERN NSString * const kCAMediaTimingFunctionEaseIn
CA_AVAILABLE_STARTING (10.5, 2.0, 9.0, 2.0);
CA_EXTERN NSString * const kCAMediaTimingFunctionEaseOut
CA_AVAILABLE_STARTING (10.5, 2.0, 9.0, 2.0);
CA_EXTERN NSString * const kCAMediaTimingFunctionEaseInEaseOut
CA_AVAILABLE_STARTING (10.5, 2.0, 9.0, 2.0);
CA_EXTERN NSString * const kCAMediaTimingFunctionDefault
CA_AVAILABLE_STARTING (10.6, 3.0, 9.0, 2.0);
NS_ASSUME_NONNULL_END
**/
animation.timingFunction=[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
[self.baseBtn.layer addAnimation:animation forKey:@"alpha"];
}
效果
2 CATransition 的转场动画
之前我们就知道CATransition继承于CAAniamtion ，CATransition用于做转场动画，能够为层提供移出屏幕和移入屏幕的动画效果。
@interface CATransition : CAAnimation
@property(copy) NSString *type; //动画过渡类型
@property(nullable, copy) NSString *subtype; //动画过渡方向
@property float startProgress;
@property float endProgress;
@property(nullable, strong) id filter;
@end
type的值解读对应常量
fade 淡入淡出 kCATransitionFade
push 推挤 kCATransitionPush
reveal 揭开 kCATransitionReveal
moveIn 覆盖 kCATransitionMoveIn
cube 立方体 私有API
suckEffect 吮吸 私有API
oglFlip 翻转 私有API
rippleEffect 波纹 私有API
pageCurl 反翻页 私有API
cameraIrisHollowOpen 开镜头 私有API
cameraIrisHollowClose 关镜头 私有API
过渡方向参数
kCATransitionFromRight 从右转场
kCATransitionFromLeft 从左转场
kCATransitionFromBottom 从下转场
kCATransitionFromTop 从上转场
上代码 imageView 放了一张女神王祖贤的照片
//转场动画
-(void)maketransAnimation
{
CATransition* trans=[CATransition animation];
trans.repeatCount=1000;
// trans.type= kCATransitionPush;
trans.type=@"oglFlip";
trans.subtype=kCATransitionFromRight;
trans.duration=1.2;
trans.autoreverses=YES;
[self.imageView.layer addAnimation:trans forKey:nil];
}
