使用最經典的一張圖來介紹一下動畫抽象類CAAnimation.同NSOperation一樣，都是抽象類，并不具備封裝操作的能力，必須使用其子類。

CAAnimation.png

CAAnimationGroup:動畫組，多個動畫同時執行。
CABasicAnimation:基本動畫，可以做到平移、縮放、旋轉
CAKeyframeAnimation:幀動畫，動畫可以分成幾個過程執行
CATransition:轉場動畫，可以實現兩個界面或控件的推出、翻頁等效果。

CABasicAnimation:基本動畫

// 正方形按鈕控件
@property (weak, nonatomic) IBOutlet UIButton *basicBtn;

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
//    CABasicAnimation是CAPropertyAnimation的子類, CAPropertyAnimation有一個字符串類型的keyPath屬性
//    keyPath內容是CALayer的可動畫Animatable屬性,我們可以指定CALayer的某個屬性名為keyPath，并且對CALayer的這個屬性的值進行修改，達到相應的動畫效果。
//    例如：指定keyPath = @"position"，就會修改CALayer的position屬性的值，- > 可以實現平移的動畫效果
//    如果fillMode=kCAFillModeForwards同時removedOnComletion=NO，那么在動畫執行完畢后，圖層會保持顯示動畫執行后的狀態。但在實質上，圖層的屬性值還是動畫執行前的初始值，并沒有真正被改變。
//    http://www.lxweimin.com/p/3c0ed03a5816
    
//    [self basicAnimationWithbounds];
    
    [self basicAnimationWithRotation];
    
//  平移可使用  keyPath = @"position";
}

- (void)basicAnimationWithbounds
{
    CABasicAnimation *basic = [CABasicAnimation animationWithKeyPath:@"bounds"];
    basic.duration = 2.0;
    //    basic.fromValue = [NSValue valueWithCGRect:CGRectMake(0, 0, 100, 100)];
    basic.toValue = [NSValue valueWithCGRect:CGRectMake(0, 0, ScreenW, ScreenW)];
    //    basic.fillMode = kCAFillModeForwards;
    //    basic.removedOnCompletion = NO;
    basic.repeatCount = MAXFLOAT;
    
    [self.basicBtn.layer addAnimation:basic forKey:nil];
}


- (void)basicAnimationWithRotation
{
//    [self.basicBtn.layer removeAllAnimations];
    
    CABasicAnimation *basic = [CABasicAnimation animationWithKeyPath:@"transform"];
    basic.duration = 4.0;

    basic.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeRotation(M_PI * 0.5, 0, 0, 1)];
    basic.fillMode = kCAFillModeForwards;
    basic.removedOnCompletion = NO;
//    basic.repeatCount = MAXFLOAT;
    
    [self.basicBtn.layer addAnimation:basic forKey:nil];
}

CAAnimationGroup:動畫組

@property (weak, nonatomic) IBOutlet UIButton *groupBtn;

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    
    [self caanimationGroup];
}

- (void)caanimationGroup
{
    CAAnimationGroup *groupAnimation = [CAAnimationGroup animation];
                                        
    CABasicAnimation *basic1 = [CABasicAnimation animationWithKeyPath:@"bounds"];
//    basic1.duration = 2.0;
    //    basic.fromValue = [NSValue valueWithCGRect:CGRectMake(0, 0, 100, 100)];
    basic1.toValue = [NSValue valueWithCGRect:CGRectMake(0, 0, ScreenW, ScreenW)];
    //    basic.fillMode = kCAFillModeForwards;
    //    basic.removedOnCompletion = NO;
    basic1.repeatCount = MAXFLOAT;
    
    CABasicAnimation *basic2 = [CABasicAnimation animationWithKeyPath:@"transform"];
//    basic2.duration = 3.0;
    
    basic2.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeRotation(M_PI * 0.5, 0, 0, 1)];
//    basic2.fillMode = kCAFillModeForwards;
//    basic2.removedOnCompletion = NO;
    //    basic.repeatCount = MAXFLOAT;
    
    
    CABasicAnimation *basic3 = [CABasicAnimation animation];
    basic3.keyPath = @"position";
    CGPoint center = self.groupBtn.center;
    center.y += 300;
    basic3.toValue = [NSValue valueWithCGPoint:center];
    
    groupAnimation.animations = @[basic1,basic2];
    groupAnimation.duration = 0.5;
//    groupAnimation.removedOnCompletion = NO;
//    groupAnimation.fillMode = kCAFillModeForwards;
    groupAnimation.repeatCount = MAXFLOAT;
    
    [self.groupBtn.layer addAnimation:groupAnimation forKey:nil];
    
}

CATransition:轉場動畫

// 在觸摸事件或其他事件的方法中實現，在展示圖片是，為imageview控件添加轉場動畫，開發中在歡迎界面推向主界面時，我們一般使用的是轉場動畫
self.centerImage.image = [UIImage imageNamed:[NSString stringWithFormat:@"meinv%d.jpg",self.imageIndex]];
    
    CATransition *trans = [CATransition animation];
    trans.type = @"pageCurl";
    trans.subtype = kCATransitionFromRight;
    trans.duration = 1.0;
    [self.centerImage.layer addAnimation:trans forKey:nil];

CAKeyframeAnimation:幀動畫

@property (weak, nonatomic) IBOutlet UIButton *keyFrameBtn;

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    [self keyframeAnimation];
}

- (void)keyframeAnimation
{
    CAKeyframeAnimation *keyframeAnimation = [CAKeyframeAnimation animation];
    keyframeAnimation.keyPath = @"transform";
    keyframeAnimation.duration = 1.0;
    NSValue *value1 = [NSValue valueWithCATransform3D:CATransform3DMakeRotation(M_PI * 0.5, 0, 0, 1)];
    NSValue *value2 = [NSValue valueWithCATransform3D:CATransform3DMakeRotation(M_PI * 1, 0, 0, 1)];
    NSValue *value3 = [NSValue valueWithCATransform3D:CATransform3DMakeRotation(M_PI * 1.5, 0, 0, 1)];
    NSValue *value4 = [NSValue valueWithCATransform3D:CATransform3DMakeRotation(M_PI * 2, 0, 0, 1)];
    
    keyframeAnimation.values = @[value1,value2,value3,value4];
    keyframeAnimation.fillMode = kCAFillModeForwards;
    
    //    如果fillMode=kCAFillModeForwards同時removedOnComletion=NO，那么在動畫執行完畢后，圖層會保持顯示動畫執行后的狀態。但在實質上，圖層的屬性值還是動畫執行前的初始值，并沒有真正被改變。
    keyframeAnimation.removedOnCompletion = NO;
    keyframeAnimation.repeatCount = MAXFLOAT;
    
    [self.keyFrameBtn.layer addAnimation:keyframeAnimation forKey:nil];
    
}

demo分享鏈接
參考文章