我无法在我的 View 中为 uiLabel 设置动画。
实际上,我只想在圆形路径上为我的标签/文本设置动画。我在互联网上搜索了很多,但找不到任何好的教程或示例来解决我的问题。我完成了 CAShapeLayer(圆圈)从 0 增加到最大值....
同样,我希望我的标签/文本从圆形路径的初始点开始移动,并在完成一圈后回到初始点。
希望我已经非常准确地解释了我的问题……如果有任何遗漏或无法理解的地方。请问我。
感谢期待。
最佳答案
嗨,iOmi,我刚刚用谷歌搜索了一下,我发现 Best Question 与您的 This 相似
下面是一个jin的回答 希望对你有帮助
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"];
我刚刚创建了一个演示,屏幕截图是:-
这是演示链接
关于ios - 如何在 iOS 中为圆形路径上的标签设置动画?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/14452086/