如何在iOS中的圆形路径上动画标签？

Question

在我看来,我被困在动画uiLabel.

实际上我只是想在圆形路径上设置标签/文本的动画.我已经在互联网上搜索了很多但是找不到任何好的教程或例子来做我喜欢的问题.我做了CAShapeLayer(圆圈)从0增加到它的最大值....

同样地,我希望我的标签/文本从圆形路径中的初始点开始移动,并在完成一个圆后回到其初始点.

希望我已经非常准确地解释了我的问题......如果有任何遗漏或不可理解的话.请问我

谢谢你的期待.

Answer 1

嗨IOMI我只是谷歌,我发现最好的问题类似像你这样

Bellow这是一个jin的答案希望它可以帮助你

        CAShapeLayer* circle = [[CAShapeLayer alloc] init];
        CGMutablePathRef path = CGPathCreateMutable();
        CGRect textRect = CGRectMake(self.view.bounds.size.width/4, (self.view.bounds.size.height-self.view.bounds.size.width/2)/2, self.view.bounds.size.width/2, self.bounds.size.width/2);
        float midX = CGRectGetMidX(textRect);
        float midY = CGRectGetMidY(textRect);
        CGAffineTransform t = CGAffineTransformConcat(
                                CGAffineTransformConcat(
                                    CGAffineTransformMakeTranslation(-midX, -midY), 
                                    CGAffineTransformMakeRotation(-1.57079633/0.99)), 
                                CGAffineTransformMakeTranslation(midX, midY));
        CGPathAddEllipseInRect(path, &t, textRect);
        circle.path = path;
        circle.frame = self.bounds;
        circle.fillColor = [UIColor clearColor].CGColor;
        circle.strokeColor = [UIColor blackColor].CGColor;
        circle.lineWidth = 60.0f;
        [self.layer addSublayer:circle];

        CABasicAnimation* animation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
        animation.duration = 15.0f;
        animation.fromValue = [NSNumber numberWithFloat:0.0f];
        animation.toValue = [NSNumber numberWithFloat:1.0f];
        animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
        [circle addAnimation:animation forKey:@"strokeEnd"];

        [circle release];

        UILabel* label = [[UILabel alloc] init];
        label.text = @"Test Text";
        label.font = [UIFont systemFontOfSize:20.0f];
        label.center = CGPathGetCurrentPoint(path);
        label.transform = CGAffineTransformMakeRotation(1.57079633);
        [label sizeToFit];
        [self.layer addSublayer:label.layer];

        CAKeyframeAnimation* textAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
        textAnimation.duration = 15.0f;
        textAnimation.path = path;
        textAnimation.rotationMode = kCAAnimationRotateAuto;
        textAnimation.calculationMode = kCAAnimationCubicPaced;
        textAnimation.removedOnCompletion = NO;
        [label.layer addAnimation:textAnimation forKey:@"position"];

我只是创建一个它的屏幕截图演示: -

这里是演示链接

http://www.sendspace.com/file/dq5i1e