基于CABasicAnimation一些简单的动画

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利用CABasicAnimation来实现一些缩放，平移，旋转的动画

1.缩放

/**
 *  缩放
 */
- (void)scale {
    CALayer *scaleLayer = [[CALayer alloc] init];
    scaleLayer.backgroundColor = [UIColor purpleColor].CGColor;
    scaleLayer.frame = CGRectMake(50, 70, 25, 25);
    scaleLayer.shadowOffset = CGSizeMake(0, 10);
    scaleLayer.shadowRadius = 3.0f;
    scaleLayer.shadowOpacity = 0.5f;
    scaleLayer.cornerRadius = scaleLayer.bounds.size.width * 0.5;
    scaleLayer.masksToBounds = YES;
    [self.view.layer addSublayer:scaleLayer];
    
    CABasicAnimation *scaleAnimation = [[CABasicAnimation alloc] init];
    scaleAnimation.keyPath = @"transform.scale"; // 设置动画的方式
    scaleAnimation.fromValue = [NSNumber numberWithInteger:1]; // 起点
    scaleAnimation.toValue = [NSNumber numberWithInteger:2]; // 终点
    scaleAnimation.duration = 1.0f; // 设置动画的时间
    scaleAnimation.repeatCount = MAXFLOAT; // 设置动画的次数
    scaleAnimation.autoreverses = YES; // 返回原始状态是否动画方式
    
    [scaleLayer addAnimation:scaleAnimation forKey:@"scale"]; // 添加动画
}

2.平移

/**
 *  平移
 */
- (void)position {
    CALayer *positionLayer = [[CALayer alloc] init];
    positionLayer.backgroundColor = [UIColor redColor].CGColor;
    positionLayer.cornerRadius = 5.0f;
    positionLayer.masksToBounds = YES;
    positionLayer.frame = CGRectMake(50, 140, 25, 25);
    [self.view.layer addSublayer:positionLayer];
    
    CABasicAnimation *positionAnimation = [CABasicAnimation animationWithKeyPath:@"transform.translation.x"]; // 设置动画方式沿着X轴
    positionAnimation.toValue = [NSNumber numberWithInteger:250];
    positionAnimation.duration = 3.0f;
    positionAnimation.repeatCount = MAXFLOAT;
    positionAnimation.autoreverses = YES;
    
    [positionLayer addAnimation:positionAnimation forKey:@"position"];
}
    

3.旋转

/**
 *  旋转
 */
- (void)rotate {
    CALayer *rotateLayer = [[CALayer alloc] init];
    rotateLayer.backgroundColor = [UIColor blueColor].CGColor;
    rotateLayer.cornerRadius = 5.0f;
    rotateLayer.masksToBounds = YES;
    rotateLayer.frame = CGRectMake(50, 200, 50, 50);
    [self.view.layer addSublayer:rotateLayer];
    
    CABasicAnimation *rotateAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation"];
    rotateAnimation.toValue = [NSNumber numberWithFloat:M_PI * 2];
    rotateAnimation.duration = 2.0f;
    rotateAnimation.autoreverses = NO;
    rotateAnimation.repeatCount = MAXFLOAT;
    
    [rotateLayer addAnimation:rotateAnimation forKey:@"rotate"];
}

4.动画组，将所有的操作都放入一个layer中

/**
 *  动画组
 */
- (void)groupAnimation {
    CALayer *groupLayer = [[CALayer alloc] init];
    groupLayer.backgroundColor = [UIColor grayColor].CGColor;
    groupLayer.frame = CGRectMake(50, 280, 25, 25);
    groupLayer.cornerRadius = 10.0f;
    groupLayer.masksToBounds = YES;
    [self.view.layer addSublayer:groupLayer];
    
    // 缩放
    CABasicAnimation *scaleAnimation = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
    scaleAnimation.fromValue = [NSNumber numberWithFloat:1.0f];
    scaleAnimation.toValue = [NSNumber numberWithFloat:2.0];
    scaleAnimation.duration = 1.0f;
    scaleAnimation.repeatCount = MAXFLOAT;
    scaleAnimation.autoreverses = YES;
    
    // 平移
    CABasicAnimation *positionAnimation = [CABasicAnimation animationWithKeyPath:@"transform.translation"];
    positionAnimation.toValue = [NSValue valueWithCGPoint:CGPointMake(300, 400)];
    positionAnimation.duration = 3.0f;
    positionAnimation.autoreverses = YES;
    
    // 旋转
    CABasicAnimation *rotateAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation"];
    rotateAnimation.toValue = [NSNumber numberWithFloat:M_PI * 2];
    rotateAnimation.duration = 0.8f;
    rotateAnimation.autoreverses = NO;
    rotateAnimation.repeatCount = MAXFLOAT;
    
    // 动画组
    CAAnimationGroup *animationGroup = [[CAAnimationGroup alloc] init];
    animationGroup.duration = 2.0f;
    animationGroup.autoreverses = YES;
    animationGroup.repeatCount = MAXFLOAT;
    animationGroup.animations = @[scaleAnimation, positionAnimation, rotateAnimation];
    [groupLayer addAnimation:animationGroup forKey:@"group"];
}

iOS还有一些其他的KeyPath来实现其他的动画

transform.rotation.x       绕X轴旋转
transform.rotation.y       绕Y轴旋转
transform.scale.x          缩放X
transform.scale.y          缩放Y
transform.translation.x    平移X
transform.translation.y    平移Y