1: 什么是CABasicAnimation

CABasicAnimation是核心動畫中的一個類，其父類是CAPropertyAnimation单刁，其子類是CASpringAnimation所刀，它的祖父是CAAnimation睹欲。它主要用于制作比較單一的動畫泣崩，例如昔头，平移、縮放考杉、旋轉、顏色漸變舰始、邊框的值的變化等崇棠，也就是將layer的某個屬性值從一個值到另一個值的變化。

2: 屬性說明

3: 實例化

/* Creates a new animation object with its `keyPath' property set to
 * 'path'. 
創(chuàng)建一個新的動畫丸卷，其“keyPath”為“路徑”枕稀。
*/
+ (instancetype)animationWithKeyPath:(nullable NSString *)path;

下面是對path比較全面的總結，每個keypath對應一種屬性值的變化，其中涉及到顏色變化的都必須使用CGColor萎坷，因為對應是對layer的屬性凹联。

#ifndef AnimationKeyPathName_h
#define AnimationKeyPathName_h
#import <Foundation/Foundation.h>

#pragma mark- CATransform3D Key Paths
/** 
 *  @brief  旋轉x,y,z分別是繞x,y,z軸旋轉 
 */
static NSString *kCARotation = @"transform.rotation";
static NSString *kCARotationX = @"transform.rotation.x";
static NSString *kCARotationY = @"transform.rotation.y";
static NSString *kCARotationZ = @"transform.rotation.z";

/** 
 *  @brief  縮放x,y,z分別是對x,y,z方向進行縮放
 */
static NSString *kCAScale = @"transform.scale";
static NSString *kCAScaleX = @"transform.scale.x";
static NSString *kCAScaleY = @"transform.scale.y";
static NSString *kCAScaleZ = @"transform.scale.z";

/** 
 *  @brief  平移x,y,z同上
 */
static NSString *kCATranslation = @"transform.translation";
static NSString *kCATranslationX = @"transform.translation.x";
static NSString *kCATranslationY = @"transform.translation.y";
static NSString *kCATranslationZ = @"transform.translation.z";

#pragma mark- 平面
/** 
 *  @brief  CGPoint中心點改變位置，針對平面 
 */
static NSString *kCAPosition = @"position";
static NSString *kCAPositionX = @"position.x";
static NSString *kCAPositionY = @"position.y";

/** 
 *  @brief  CGRect 
 */
static NSString *kCABoundsSize = @"bounds.size";
static NSString *kCABoundsSizeW = @"bounds.size.width";
static NSString *kCABoundsSizeH = @"bounds.size.height";
static NSString *kCABoundsOriginX = @"bounds.origin.x";
static NSString *kCABoundsOriginY = @"bounds.origin.y";

/** 
 *  @brief  透明度 
 */
static NSString *kCAOpacity = @"opacity";
/** 
 *  @brief  背景色 
 */
static NSString *kCABackgroundColor = @"backgroundColor";
/** 
 *  @brief  圓角 
 */
static NSString *kCACornerRadius = @"cornerRadius";
/** 
 *  @brief   邊框 
 */
static NSString *kCABorderWidth = @"borderWidth";
/** 
 *  @brief  陰影顏色
 */
static NSString *kCAShadowColor = @"shadowColor";
/** 
 *  @brief  偏移量CGSize
 */
static NSString *kCAShadowOffset = @"shadowOffset";
/** 
 *  @brief  陰影透明度
 */
static NSString *kCAShadowOpacity = @"shadowOpacity";
/** 
 *  @brief  陰影圓角 
 */
static NSString *kCAShadowRadius = @"shadowRadius";

#endif /* AnimationKeyPathName_h */

4:簡單用法

4.1 位移動畫

 //使用CABasicAnimation創(chuàng)建基礎動畫
    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"position"];
    animation.fromValue = [NSValue valueWithCGPoint:CGPointMake(0, SCREEN_HEIGHT/2-75)];
    animation.toValue = [NSValue valueWithCGPoint:CGPointMake(SCREEN_WIDTH, SCREEN_HEIGHT/2-75)];
    animation.duration = 2.0f;
    animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
    [_demoView.layer addAnimation:animation forKey:@"positionAnimation"];
ps:
    //如果fillMode=kCAFillModeForwards和removedOnComletion=NO哆档，那么在動畫執(zhí)行完畢后蔽挠，圖層會保持顯示動畫執(zhí)行后的狀態(tài)。但在實質上瓜浸，圖層的屬性值還是動畫執(zhí)行前的初始值澳淑，并沒有真正被改變。
    //animation.duration.fillMode = kCAFillModeForwards;
    //animation.duration.removedOnCompletion = NO;

4.2 透明度動畫

    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"opacity"];
    animation.fromValue = [NSNumber numberWithFloat:1.0f];
    animation.toValue = [NSNumber numberWithFloat:0.2f];
    animation.duration = 1.0f;
    [_demoView.layer addAnimation:animation forKey:@"opacityAniamtion"];

4.3 縮放動畫

    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform.scale"];//同上
    animation.toValue = [NSNumber numberWithFloat:2.0f];
    animation.duration = 1.0f;
    [_demoView.layer addAnimation:animation forKey:@"scaleAnimation"];

4.4 旋轉動畫

CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];//繞著z軸為矢量插佛，進行旋轉(@"transform.rotation.z"==@@"transform.rotation")
    animation.toValue = [NSNumber numberWithFloat:M_PI];
    animation.duration = 1.0f;
    [_demoView.layer addAnimation:animation forKey:@"rotateAnimation"];

4.5 背景色變化動畫

CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"backgroundColor"];
    animation.toValue =(id) [UIColor greenColor].CGColor;
    animation.duration = 1.0f;
    [_demoView.layer addAnimation:animation forKey:@"backgroundAnimation"];

4.6 組動畫

CABasicAnimation *positionAnima = [CABasicAnimation animationWithKeyPath:@"position.y"];
positionAnima.fromValue = @(self.imageView.center.y);
positionAnima.toValue = @(self.imageView.center.y-30);
positionAnima.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];

CABasicAnimation *transformAnima = [CABasicAnimation animationWithKeyPath:@"transform.rotation.y"];
transformAnima.fromValue = @(0);
transformAnima.toValue = @(M_PI);
transformAnima.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];

CAAnimationGroup *animation = [CAAnimationGroup animation];
animaGroup.duration = 2.0f;
animaGroup.fillMode = kCAFillModeForwards;
animaGroup.removedOnCompletion = NO;
animaGroup.animations = @[positionAnima,transformAnima];

[_demoView.layer addAnimation:animaGroup forKey:@"Animation"];

5: 獲取動畫開始和結束時的事件

添加代理事件

animation.delegate = self;
ps:會有循環(huán)引用,暫未解決!

實現(xiàn)代理方法

//動畫開始時
- (void)animationDidStart:(CAAnimation *)anim
{
    if ([anim isEqual:[self.imageView.layer animationForKey:@"Animation"]]) {
        NSLog(@"動畫組執(zhí)行了");
    }
}
//動畫結束時
- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag
{
    //方法中的flag參數(shù)表明了動畫是自然結束還是被打斷,比如調用了removeAnimationForKey:方法或removeAnimationForKey方法杠巡，flag為NO，如果是正常結束雇寇，flag為YES氢拥。
    NSLog(@"結束了");
}