CAKeyframeAnimation－关键帧动画

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//关键帧动画 CAKeyframeAnimation
- (void)keyAnimation{CALayer *layer =[CALayer layer];layer.bounds = CGRectMake(0, 0, 100, 100);layer.position = CGPointMake(100,100);layer.backgroundColor = [UIColor yellowColor].CGColor;[self.view.layer addSublayer:layer];CAKeyframeAnimation *anim = [CAKeyframeAnimation animation];anim.keyPath = @"position";anim.removedOnCompletion = NO;anim.fillMode = kCAFillModeForwards;anim.duration = 2.0;CGMutablePathRef path = CGPathCreateMutable();CGPathAddEllipseInRect(path, NULL, CGRectMake(100, 100, 200, 200));anim.path = path;CGPathRelease(path);// 设置动画的执行节奏// kCAMediaTimingFunctionEaseInEaseOut : 一开始比较慢, 中间会加速,  临近结束的时候, 会变慢anim.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];anim.delegate = self;[layer addAnimation:anim forKey:nil];}

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