iOS CABasicAnimation CAAnimationGroup 對顏色做連續漸變動畫
http://blog.sina.com.cn/s/blog_969096f10101hre7.html
//此動畫效果分三個階段 程實原創
//1、從白色變為灰色 程實原創
//2、灰色變為橘色,再變為灰色,往返作三次 程實原創
//3、會後從灰色變為白色 程實原創
#define RGBCOLOR(r,g,b) [UIColor colorWithRed:(r)/255.0f green:(g)/255.0fblue:(b)/255.0f alpha:1]
//此時做背景色漸變一定用CGColor
//要使用的三個顏色
CGColorRef originColor = [UIColor whiteColor].CGColor
CGColorRef darkGray = RGBCOLOR(207, 205, 205).CGColor;
CGColorRef orange = RGBCOLOR(240, 221, 185).CGColor;
CGFloat duration = 0.75;
//1、從白色變為灰色 程實原創
CABasicAnimation *anim1 = [CABasicAnimationanimationWithKeyPath:@"backgroundColor"];
anim1.duration = duration;
anim1.fromValue = (id)originColor;
anim1.toValue = (id)darkGray;
//填充效果:動畫結束後,動畫將保持最後的表現狀態
anim1.fillMode = kCAFillModeForwards;
anim1.removedOnCompletion = NO;
anim1.beginTime = 0.0f;
//下面介紹一下fillMode這個列舉
kCAFillModeRemoved 動畫結束後,將會移除掉做的動畫效果
kCAFillModeForwards 動畫結束後,動畫將保持最後的表現狀態
kCAFillModeBackwards 與kCAFillModeForwards相對應
kCAFillModeBoth 是kCAFillModeForwards和kCAFillModeBackwards的結合
kCAFillModeFrozen 4.0之後就不推薦使用了。
CABasicAnimation *anim = [CABasicAnimationanimationWithKeyPath:@"backgroundColor"];
anim.duration = duration;
anim.fromValue = (id)darkGray;
anim.toValue = (id)orange;
anim.repeatCount = 3;
anim.autoreverses = YES;
//此時anim.removedOnCompletion和anim.fillMode設不設定都行。因為會被middleGroup的引數覆蓋
anim.removedOnCompletion = NO;
anim.fillMode = kCAFillModeBoth;
anim.beginTime = 0.0f;
CAAnimationGroup * middleGroup = [CAAnimationGroup animation];
//一次動畫用時duration,往返乘以2,做三次,用時*3,所以是6倍
middleGroup.duration = duration*6;
middleGroup.animations = @[anim];
middleGroup.removedOnCompletion = NO;
//此autoreverses設為yes則會坐動畫還原
middleGroup.autoreverses = YES;
middleGroup.fillMode = kCAFillModeForwards;
//設定此動畫的開始時間
middleGroup.beginTime = duration;
//變回原來顏色
CABasicAnimation *anim3 = [CABasicAnimationanimationWithKeyPath:@"backgroundColor"];
anim3.duration = duration;
anim3.fromValue = (id)darkGray;
anim3.toValue = (id)originColor;
anim3.removedOnCompletion = NO;
anim3.beginTime = duration * 7;
anim3.fillMode = kCAFillModeForwards;
CAAnimationGroup * theGroup = [CAAnimationGroup animation];
theGroup.duration = duration*8;
theGroup.animations = @[anim1,middleGroup,anim3];
theGroup.removedOnCompletion = NO;
theGroup.fillMode = kCAFillModeBoth;
[self.holderView.layer addAnimation:theGroup forKey:@"backgroundColor"];