如何在iPhone中使用动画绘制线条

我正在用CGContextRef在iphone中画线。有谁能建议我如何在iphone中用动画画线

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请建议。

这是一条直线吗？。。可以使用1像素宽的UIView并设置其帧属性的动画。使用

[UIView beginAnimations]

和

[UIView committeanimations]否则

编辑的回复

使用核心动画，您可以执行以下操作（例如，在按钮后面）

路径动画定义为：

- (CAAnimation*)pathAnimation;
{

    CGMutablePathRef path = CGPathCreateMutable();
    CGPathMoveToPoint(path,NULL,50.0,120.0);

    CGPathAddCurveToPoint(path,NULL,50.0,275.0,
                          150.0,275.0,
                          150.0,120.0);
    CGPathAddCurveToPoint(path,NULL,150.0,275.0,
                          250.0,275.0,
                          250.0,120.0);    
    CGPathAddCurveToPoint(path,NULL,250.0,275.0,
                          350.0,275.0,
                          350.0,120.0);    
    CGPathAddCurveToPoint(path,NULL,350.0,275.0,
                          450.0,275.0,
                          450.0,120.0);

    CAKeyframeAnimation *
        animation = [CAKeyframeAnimation 
                     animationWithKeyPath:@"position"];

    [animation setPath:path];
    [animation setDuration:3.0];

    [animation setAutoreverses:YES];

    CFRelease(path);

    return animation;

}

这只是一个指向核心动画的指针。有关详细信息，请参阅。
以下是答案（可在此处找到：）

不要忘记导入马丁答案的Swift 3版本（使用Xcode 8.3.3进行检查）

谢谢你的回复。我已经试过了，但不起作用。你能给我一个好的示例代码吗。它不仅包含状态线，还包含弧。类似于CGContextAddArc（上下文，单元格大小，0,32，-90，-180,1）；请提出建议。我添加了响应，以指示您可以做什么。您绝对需要使用核心动画关键帧动画来执行此操作。这非常有用，但当它结束时，我如何才能再开始一个新动画？提前感谢。@yucelbayram设置动画的委托，然后实现委托方法：-（void）animationDidStop:（CAAnimation*）anim finished:（BOOL）flag@AskeAnker谢谢，我试试这个。
- (CAAnimation*)pathAnimation;
{

    CGMutablePathRef path = CGPathCreateMutable();
    CGPathMoveToPoint(path,NULL,50.0,120.0);

    CGPathAddCurveToPoint(path,NULL,50.0,275.0,
                          150.0,275.0,
                          150.0,120.0);
    CGPathAddCurveToPoint(path,NULL,150.0,275.0,
                          250.0,275.0,
                          250.0,120.0);    
    CGPathAddCurveToPoint(path,NULL,250.0,275.0,
                          350.0,275.0,
                          350.0,120.0);    
    CGPathAddCurveToPoint(path,NULL,350.0,275.0,
                          450.0,275.0,
                          450.0,120.0);

    CAKeyframeAnimation *
        animation = [CAKeyframeAnimation 
                     animationWithKeyPath:@"position"];

    [animation setPath:path];
    [animation setDuration:3.0];

    [animation setAutoreverses:YES];

    CFRelease(path);

    return animation;

}

UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:CGPointMake(50.0,0.0)];
[path addLineToPoint:CGPointMake(120.0, 600.0)];

CAShapeLayer *pathLayer = [CAShapeLayer layer];
pathLayer.frame = self.view.bounds;
pathLayer.path = path.CGPath;
pathLayer.strokeColor = [[UIColor redColor] CGColor];
pathLayer.fillColor = nil;
pathLayer.lineWidth = 2.0f;
pathLayer.lineJoin = kCALineJoinBevel;

[self.view.layer addSublayer:pathLayer];

CABasicAnimation *pathAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
pathAnimation.duration = 2.0;
pathAnimation.fromValue = [NSNumber numberWithFloat:0.0f];
pathAnimation.toValue = [NSNumber numberWithFloat:1.0f];
[pathLayer addAnimation:pathAnimation forKey:@"strokeEnd"];

    let path = UIBezierPath()
    path.move(to: CGPoint(x: 50, y: 0))
    path.addLine(to: CGPoint(x: 120, y: 600))

    let pathLayer = CAShapeLayer()
    pathLayer.frame = view.bounds
    pathLayer.path = path.cgPath
    pathLayer.strokeColor = UIColor.red.cgColor
    pathLayer.fillColor = nil
    pathLayer.lineWidth = 2
    pathLayer.lineJoin = kCALineJoinBevel
    view.layer.addSublayer(pathLayer)

    let pathAnimation = CABasicAnimation(keyPath: "strokeEnd")
    pathAnimation.duration = 2.0
    pathAnimation.fromValue = 0
    pathAnimation.toValue = 1
    pathLayer.add(pathAnimation, forKey: "strokeEnd")