学习iOS全局跑马灯

+ (instancetype)shareManager {
 static CCPaomaView *pModel = nil;
 static dispatch_once_t once;
 dispatch_once(&once, ^{
  pModel = [[CCPaomaView alloc]initWithFrame:CGRectMake(0, 0, KScreenWidth, 0.0468 *KScreenHeight)];
 });
 return pModel;
}

- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag{
 NSLog(@"%@",[self.paomaLabel.layer animationForKey:@"paoMaDeng"]);
 if ([self.paomaLabel.layer animationForKey:@"paoMaDeng"] == anim) {
  //移除第一组数据
  [_array removeObjectAtIndex:0];
  
  //移除整个 plist
  [CCPaomaModel removePaomaPlist];
  
  //重新写入
  [_array writeToFile:[CCPaomaModel filename] atomically:YES];
  
  //动画停止之后，将实例置为 nil
  _pmAniamtion = nil;
  
  //数组为空之后移除跑马灯
  if (_array.count > 0) {
   [self showPaomaView:self.superview];
  }else{
   self.hidden = YES;
   [self removeFromSuperview];
  }
  NSLog(@"%@",self.array);
 }
}

- (void)paomaAniamtion:(CGFloat)count{
 //判断动画实例存不存在，存在继续，不存在即创建
 if (_pmAniamtion == nil) {
  _pmAniamtion = [CABasicAnimation animation];
  _pmAniamtion.keyPath = @"transform.translation.x";
  CGFloat W = CGRectGetWidth(_paomaLabel.bounds);
  _pmAniamtion.fromValue = @(W);
  _pmAniamtion.toValue = @(-W);
  _pmAniamtion.duration = _aniTime;
  _pmAniamtion.repeatCount = count;
  _pmAniamtion.removedOnCompletion = NO;  //动画结束不移除
  _pmAniamtion.fillMode = kCAFillModeForwards; //动画结束会保持结束的状态
  _pmAniamtion.delegate = self;    //设置代理
  [_paomaLabel.layer addAnimation:_pmAniamtion forKey:@"paoMaDeng"];
 }else{
  _pmAniamtion.repeatCount = count;
 }
}

#pragma mark -- 界面出现、消失，创建、恢复、暂停动画
- (void)viewWillAppear:(BOOL)animated {
 [_paomaView showPaomaView:self.view];
 [_paomaView resumeAnimation];
}

- (void)viewWillDisappear:(BOOL)animated {
 [_paomaView pauseAniamtion];
}