核心动画--->CoreAnimation导入<QuartzCore/QuartzCore.h>
CAAnimation是个抽象类，应该使用他具体的子类。
一、基本动画
1>anmi.removedOnCompletion = NO;//如果退出到后台，动画要继续执行的话，需要用将这个属性设置为NO，默认是YES;
2>#pragma mark 平移
- (void)moveTo:(CGPoint)to
{
//1.实例化一个基本动画
CABasicAnimation *anmi = [CABasicAnimationanimationWithKeyPath:@"position"];
//2.toValue&fromValue
anmi.toValue = [NSValue valueWithCGPoint:to];
//3.动画时长
anmi.duration = 2.0f;
//速度函数
anmi.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
//4. 启动动画
[_redView.layer addAnimation:anmi forKey:nil];
}
3>#pragma mark 缩放
- (void)scale
{
CABasicAnimation *anmi = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
anmi.toValue = @(2.0);
anmi.repeatCount = 3;
anmi.duration = 1.0f;
[_redView.layer addAnimation:anmi forKey:nil];
}
4>#pragma mark 旋转
- (void)rotate
{
CABasicAnimation *anmi = [CABasicAnimation animationWithKeyPath:@"transform.rotation"];
anmi.toValue = @(M_PI * 2);
anmi.repeatCount = HUGE_VALF;
anmi.duration = 1.0f;
[_redView.layer addAnimation:anmi forKey:nil];
}
5>#pragma mark 暂停CALayer的动画
-(void)pauseLayer:(CALayer*)layer
{
CFTimeInterval pausedTime = [layer convertTime:CACurrentMediaTime() fromLayer:nil];
// 让CALayer的时间停止走动
layer.speed = 0.0;
// 让CALayer的时间停留在pausedTime这个时刻
layer.timeOffset = pausedTime;
}
6>#pragma mark 恢复CALayer的动画
-(void)resumeLayer:(CALayer*)layer
{
CFTimeInterval pausedTime = layer.timeOffset;
// 1. 让CALayer的时间继续行走
layer.speed = 1.0;
// 2. 取消上次记录的停留时刻
layer.timeOffset = 0.0;
// 3. 取消上次设置的时间
layer.beginTime = 0.0;
// 4. 计算暂停的时间(这里也可以用CACurrentMediaTime()-pausedTime)
CFTimeInterval timeSincePause = [layer convertTime:CACurrentMediaTime() fromLayer:nil] - pausedTime;
// 5. 设置相对于父坐标系的开始时间(往后退timeSincePause)
layer.beginTime = timeSincePause;
}
二、.关键帧动画
#pragma mark 设置关键帧动画的values ----->平移到目标点
- (void)moveTo:(CGPoint)to
{
CAKeyframeAnimation *anima = [CAKeyframeAnimation animationWithKeyPath:@"position"];//初始化关键针动画，指定keyPath
NSValue *p1 = [NSValue valueWithCGPoint:CGPointMake(0, 0)];
NSValue *p2 = [NSValue valueWithCGPoint:self.center];
NSValue *p3 = [NSValue valueWithCGPoint:to];
anima.values = @[p1,p2,p3]; //设置values
anima.duration = 3.0f;
anima.removedOnCompletion = NO; //清除之前的动画属性
anima.fillMode = kCAFillModeForwards; //设置填充模式
[self.layer addAnimation:anima forKey:nil];
}
#pragma mark 设置关键帧动画的path--- ----->按照矩路径进行动画
- (void)moveToRectBy:(CGPoint)by
{
CAKeyframeAnimation *anima = [CAKeyframeAnimation animationWithKeyPath:@"position"];
//1.创建路径
CGMutablePathRef path = CGPathCreateMutable();
//2.指定Rect
CGRect rect = CGRectMake(self.center.x, self.center.y, by.x - self.center.x, by.y - self.center.y);
//3.将Rect添加到路径
CGPathAddRect(path, NULL, rect);
//4.设置路径
anima.path = path;
[self.layer addAnimation:anima forKey:nil];
//5.释放路径
CGPathRelease(path);
}
#pragma mark 设置关键帧动画的path--- ----->曲线路径动画
- (void)moveToRectto:(CGPoint)to
{
CAKeyframeAnimation *anima = [CAKeyframeAnimation animationWithKeyPath:@"position"];
//1.创建路径
CGMutablePathRef path = CGPathCreateMutable();
CGPathMoveToPoint(path, NULL, self.center.x, self.center.y);
CGPathAddQuadCurveToPoint(path, NULL, 0, 0, to.x, to.y);
//2.设置路径
anima.path = path;
[self.layer addAnimation:anima forKey:nil];
//3.释放路径
CGPathRelease(path);
}
#pragma mark 摇晃动画
- (void)shake
{
CAKeyframeAnimation *anima = [CAKeyframeAnimation animationWithKeyPath:@"transform.rotation"];
CGFloat angle = M_PI_4 / 6;
NSArray *angles = @[@(-angle),@(angle),@(-angle)];
anima.values = angles;
anima.duration = 0.1f;
anima.repeatCount = HUGE_VALF;
[self.layer addAnimation:anima forKey:nil];
}
三、动画组
*群组动画可以将一组动画集成在一起，并发执行，产生更加复杂的动画效果。不能修改同一个KeyPath
- (void)groupDemo
{
//1、初始化一个群组动画
CAAnimationGroup *group = [[CAAnimationGroup alloc] init];
//2、透明度动画
CABasicAnimation *alpha = [CABasicAnimation animationWithKeyPath:@"opacity"];
alpha.fromValue = @(1.0);
alpha.toValue = @(0.2);
//3、路径动画
CAKeyframeAnimation *path = [CAKeyframeAnimation animationWithKeyPath:@"position"];
CGMutablePathRef paths = CGPathCreateMutable();
CGPathAddEllipseInRect(paths, NULL, CGRectMake(100, 100, 200, 300));
path.path = paths;
//4、将动画添加到组动画中
group.animations = @[path,alpha];
[_myView.layer addAnimation:group forKey:nil];
}