我想動畫一個CAGradientLayer(漸變和框架),當我動畫框爲0,它收縮到視圖的左上角,我希望它只是水平地動畫。現在它的動畫水平和垂直都是0。水平只動畫CAGradientLayer
這裏是動畫目前的樣子:
我要的是當它下降到沒什麼,只是收縮水平ONLY,並保持相同高度的整個時間。
這裏是我目前使用的代碼:
- (void)drawRect:(CGRect)rect
{
// Drawing code
if (!gradientLayer) {
gradientLayer = [CAGradientLayer layer];
[gradientLayer setFrame:[self createRectForFrame:rect]];
[gradientLayer setColors:@[(id)fromColor.CGColor, (id)toColor.CGColor]];
[gradientLayer setStartPoint:CGPointMake(fillPct/100, 0.5)];
[gradientLayer setEndPoint:CGPointMake(1.0, 0.5)];
[self.layer addSublayer:gradientLayer];
}
else {
[gradientLayer removeAllAnimations];
[CATransaction begin];
[CATransaction setAnimationDuration:ANIMATION_DURATION];
CGRect newFrame = [self createRectForFrame:rect];
CABasicAnimation *frameAnimation = [CABasicAnimation animationWithKeyPath:@"frame"];
[frameAnimation setDuration:ANIMATION_DURATION];
[frameAnimation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
[frameAnimation setFromValue:[NSValue valueWithCGRect:gradientLayer.bounds]];
[frameAnimation setToValue:[NSValue valueWithCGRect:newFrame]];
[frameAnimation setFillMode:kCAFillModeForwards];
[frameAnimation setRemovedOnCompletion:NO];
[gradientLayer setFrame:newFrame];
[gradientLayer addAnimation:frameAnimation forKey:@"frame"];
CGPoint startPoint = CGPointMake(MIN(fillPct/100, 0.99), 0.5);
CABasicAnimation *startPointAnimation = [CABasicAnimation animationWithKeyPath:@"startPoint"];
[startPointAnimation setDuration:ANIMATION_DURATION];
[startPointAnimation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
[startPointAnimation setFromValue:[NSValue valueWithCGPoint:gradientLayer.startPoint]];
[startPointAnimation setToValue:[NSValue valueWithCGPoint:startPoint]];
[startPointAnimation setFillMode:kCAFillModeForwards];
[startPointAnimation setRemovedOnCompletion:NO];
[gradientLayer setStartPoint:startPoint];
[gradientLayer addAnimation:startPointAnimation forKey:@"startPoint"];
[CATransaction setCompletionBlock:^{
[self updateInnerLabelTextColor];
}];
[CATransaction commit];
}
[self bringInnerLabelToFront];
}
- (CGRect)createRectForFrame:(CGRect)frame {
if (fillPct == 0)
return CGRectZero;
else if (fillPct >= 100)
return frame;
else
return CGRectMake(frame.origin.x, frame.origin.y, frame.size.width * (fillPct/100), frame.size.height);
}
fillPct是酒吧應填充值,0和100
drawRect不是正確的地方,因爲它不使用核心圖形,但核心動畫 – Felix