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菜鸟教程小白 发表于 2022-12-13 05:37:52

ios - 暂停和恢复圆形动画

                                            <p><p>我用这段代码来画圆。圆圈在 30 秒内绘制。有什么办法可以暂停和恢复画圈吗？我可以暂停时间，但我找不到暂停和恢复画圈的方法。</p>

<pre><code> int radius = 30;
circle = ;
// Make a circular shape
circle.path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 100, 2.0*radius, 2.0*radius)
                                          cornerRadius:radius].CGPath;
// Center the shape in self.view
circle.position = CGPointMake(CGRectGetMidX(self.view.frame)-radius,
                               CGRectGetMidY(self.view.frame)-radius);

// Configure the apperence of the circle
circle.fillColor = .CGColor;
circle.strokeColor = .CGColor;
circle.lineWidth = 10;


// Add to parent layer
;

// Configure animation
drawAnimation = ;
drawAnimation.duration            = 30.0; // &#34;animate over 10 seconds or so..&#34;
drawAnimation.repeatCount         = 1.0;// Animate only once..
drawAnimation.removedOnCompletion = NO;   // Remain stroked after the animation...


// Animate from no part of the stroke being drawn to the entire stroke being drawn
drawAnimation.fromValue = ;
drawAnimation.toValue   = ;

// Experiment with timing to get the appearence to look the way you want
drawAnimation.timingFunction = ;

// Add the animation to the circle
;
</code></pre></p>
                                    <br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
                                            <p><p>您是否看过 Apple 关于暂停动画的技术说明:<a href="https://developer.apple.com/library/ios/qa/qa1673/_index.html" rel="noreferrer noopener nofollow">https://developer.apple.com/library/ios/qa/qa1673/_index.html</a> </p>

<p>所以，对于您的项目，这样的事情可以解决问题:</p>

<pre><code>- (void)viewDidLoad
{
    ;

    int radius = 30;
    _circle = ;
    // Make a circular shape
    _circle.path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 100, 2.0*radius, 2.0*radius)
                                              cornerRadius:radius].CGPath;
    // Center the shape in self.view
    _circle.position = CGPointMake(CGRectGetMidX(self.view.frame)-radius,
                                 CGRectGetMidY(self.view.frame)-radius);

    // Configure the apperence of the circle
    _circle.fillColor = .CGColor;
    _circle.strokeColor = .CGColor;
    _circle.lineWidth = 10;

    _circle.strokeEnd = 0.0f;

    // Add to parent layer
    ;

}

- (IBAction)didTapPlayPauseButton:(id)sender
{
    if (!_drawAnimation) {
      ;
    } else if(_circle.speed == 0){
      ;
    } else {
      ;
    }

}

- (void)addAnimation
{
    // Configure animation
    _drawAnimation = ;
    _drawAnimation.duration            = 30.0; // &#34;animate over 10 seconds or so..&#34;
    _drawAnimation.repeatCount         = 1.0;// Animate only once..
    _drawAnimation.removedOnCompletion = NO;   // Remain stroked after the animation...


    // Animate from no part of the stroke being drawn to the entire stroke being drawn
    _drawAnimation.fromValue = ;
    _drawAnimation.toValue   = ;

    // Experiment with timing to get the appearence to look the way you want
    _drawAnimation.timingFunction = ;

    // Add the animation to the circle
    ;
}

- (void)pauseLayer:(CALayer*)layer
{
    CFTimeInterval pausedTime = ;
    layer.speed = 0.0;
    layer.timeOffset = pausedTime;
}

- (void)resumeLayer:(CALayer*)layer
{
    CFTimeInterval pausedTime = ;
    layer.speed = 1.0;
    layer.timeOffset = 0.0;
    layer.beginTime = 0.0;
    CFTimeInterval timeSincePause = - pausedTime;
    layer.beginTime = timeSincePause;
}
</code></pre>

<p>我把它扔到 Github 上的一个项目中看看它是否可以工作:<a href="https://github.com/perlmunger/PauseAnimation.git" rel="noreferrer noopener nofollow">https://github.com/perlmunger/PauseAnimation.git</a> </p></p>
                                   
                                                <p style="font-size: 20px;">关于ios - 暂停和恢复圆形动画，我们在Stack Overflow上找到一个类似的问题：
                                                        <a href="https://stackoverflow.com/questions/20570961/" rel="noreferrer noopener nofollow" style="color: red;">
                                                                https://stackoverflow.com/questions/20570961/
                                                        </a>
                                                </p>
                                       

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