Question

我想知道有人如何在UILabel的文本上实现“幻灯片解锁效果”而不使用之前在此处提到的静态图像。

// I'd like to use the uilable's current text to this sample code  but not seem to be able to do it.

    // --->  UIImage *textImage = [UIImage imageNamed:@"SlideToUnlock.png"];
      CGFloat textWidth = textImage.size.width;
      CGFloat textHeight = textImage.size.height;

  CALayer *textLayer = [CALayer layer];
  textLayer.contents = (id)[textImage CGImage];
  textLayer.frame = CGRectMake(10.0f, 215.0f, textWidth, textHeight);
  CALayer *maskLayer = [CALayer layer];

  // Mask image ends with 0.15 opacity on both sides. Set the background color of the layer
  // to the same value so the layer can extend the mask image.
  maskLayer.backgroundColor = [[UIColor colorWithRed:0.0f green:0.0f blue:0.0f alpha:0.15f] CGColor];
  maskLayer.contents = (id)[[UIImage imageNamed:@"Mask.png"] CGImage];

  // Center the mask image on twice the width of the text layer, so it starts to the left
  // of the text layer and moves to its right when we translate it by width.
  maskLayer.contentsGravity = kCAGravityCenter;
  maskLayer.frame = CGRectMake(-textWidth, 0.0f, textWidth * 2, textHeight);

  // Animate the mask layer's horizontal position
  CABasicAnimation *maskAnim = [CABasicAnimation animationWithKeyPath:@"position.x"];
  maskAnim.byValue = [NSNumber numberWithFloat:textWidth];
  maskAnim.repeatCount = 1e100f;
  maskAnim.duration = 1.0f;
  [maskLayer addAnimation:maskAnim forKey:@"slideAnim"];

  textLayer.mask = maskLayer;
  [self.view.layer addSublayer:textLayer];

由于

Answer 1

您可以使用以下项目。这是一个带滑动解锁动画的UILabel

http://code4app.net/ios/Animated-Label/505fd71a6803fa1077000001

Answer 2

上：UILabel背景不透明，文字清晰
- 通过复杂的屏蔽过程在drawRect：func中呈现明文：
中：正在执行重复动画的工作人员视图在顶部标签后面移动图像
底部：一个UIView，您可以按顺序添加中间和顶部子视图。可以是任何你想要的文字颜色

这里可以看到一个例子https://github.com/jhurray/AnimatedLabelExample

UILabel文本动画，带侧面解锁效果

2 个答案: