- 簡單介紹
是CApropertyAnimation的子類闪水，跟CABasicAnimation的區(qū)別是：CABasicAnimation只能從一個數(shù)值(fromValue)變到另一個數(shù)值(toValue)慷丽，而CAKeyframeAnimation會使用一個NSArray保存這些數(shù)值
屬性解析：
values：就是上述的NSArray對象时捌。里面的元素稱為”關(guān)鍵幀”(keyframe)乍丈。動畫對象會在指定的時間(duration)內(nèi)叨粘，依次顯示values數(shù)組中的每一個關(guān)鍵幀
path：可以設(shè)置一個CGPathRef\CGMutablePathRef,讓層跟著路徑移動虹茶。path只對CALayer的anchorPoint和position起作用疑故。如果你設(shè)置了path撮奏，那么values將被忽略
keyTimes：可以為對應(yīng)的關(guān)鍵幀指定對應(yīng)的時間點,其取值范圍為0到1.0,keyTimes中的每一個時間值都對應(yīng)values中的每一幀.當(dāng)keyTimes沒有設(shè)置的時候,各個關(guān)鍵幀的時間是平分的
說明：CABasicAnimation可看做是最多只有2個關(guān)鍵幀的CAKeyframeAnimation
Values方式：
CAKeyframeAnimation *animation = [CAKeyframeAnimation animation];
animation.keyPath = @"position";
NSValue *value1=[NSValue valueWithCGPoint:CGPointMake(100, 100)];
NSValue *value2=[NSValue valueWithCGPoint:CGPointMake(200, 100)];
NSValue *value3=[NSValue valueWithCGPoint:CGPointMake(200, 200)];
NSValue *value4=[NSValue valueWithCGPoint:CGPointMake(100, 200)];
NSValue *value5=[NSValue valueWithCGPoint:CGPointMake(100, 100)];
animation.values=@[value1,value2,value3,value4,value5]; animation.repeatCount=MAXFLOAT;
animation.removedOnCompletion = NO;
animation.fillMode = kCAFillModeForwards;
animation.duration = 4.0f;
animation.timingFunction=[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
animation.delegate=self;
[self.myView.layer addAnimation:animation forKey:nil];Path方式：
CAKeyframeAnimation *animation = [CAKeyframeAnimation animation];
animation.keyPath = @"position";
CGMutablePathRef path=CGPathCreateMutable();
CGPathAddEllipseInRect(path, NULL, CGRectMake(150, 100, 100, 100));
animation.path=path;
CGPathRelease(path);
animation.repeatCount=MAXFLOAT;
animation.removedOnCompletion = NO;
animation.fillMode = kCAFillModeForwards;
animation.duration = 4.0f;
animation.timingFunction=[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
animation.delegate=self;
[self.myView.layer addAnimation:animation forKey:nil];
