CAKeyFrameAnimation 關(guān)鍵幀動(dòng)畫

    創(chuàng)建動(dòng)畫
    CAKeyframeAnimation * keyFrame =  [CAKeyframeAnimation animationWithKeyPath:@"bounds"];
    
    修改屬性
    keyFrame.duration = 3;
    keyFrame.values = @[[NSValue valueWithCGRect:CGRectMake(0, 0, 200, 200)], [NSValue valueWithCGRect:CGRectMake(0, 0, 250, 250)] , [NSValue valueWithCGRect:CGRectMake(0, 0, 300, 300)]];
   

    keyTimes : 值代表了出現(xiàn)動(dòng)畫的時(shí)刻 , 值得范圍是[0, 1],
    keyTimes 和Value 是一一對(duì)應(yīng)的 數(shù)字是百分比 , 數(shù)字必須是遞增的 , [0 - 0.4] 執(zhí)行第一幀 [0.4 - 0.8] 第二幀 [0.8 - 1] 執(zhí)行第三幀
    keyFrame.keyTimes = @[@(0.4),@(0.8),@(1)];
   

    添加動(dòng)畫
    [self.changeView.layer addAnimation:keyFrame forKey:@"keyFrame"];
 
    
    CAKeyframeAnimation * keyFrame = [CAKeyframeAnimation animationWithKeyPath:@"backgroundColor"];
    keyFrame.duration = 100;
    keyFrame.values = @[(id)[UIColor greenColor].CGColor , (id)[UIColor blueColor].CGColor , (id)[UIColor purpleColor].CGColor , (id)[UIColor whiteColor].CGColor];
    
    keyTimes中的第一個(gè)值是 0  , 不能被修改
    keyFrame.keyTimes = @[@(0.1),@(0.4),@(0.6),@(0.7)];
    
    [self.changeView.layer addAnimation:keyFrame forKey:nil];