mrsongzj / msnumberscrollanimatedview Goto Github PK

NSMutableArray *_replaceArr; //保存替换占位的数字,赋值与释放需要自己操作一下

//字体剧中以及超出宽度省略

• (void)configNumbersText
  {
  NSString *numberStr = [_number stringValue];
  // 如果 number 长度小于 最小长度就补0
  // 这里需要注意一下 minLength 和 length 都是NSUInteger类型 如果相减得负数的话会有问题
  for (NSInteger i = 0; i < (NSInteger)self.minLength - (NSInteger)numberStr.length; i++) {
  [_numbersText addObject:@"0"];
  [_replaceArr addObject:@"0"];
  }
  // 取出 number 各位数
  for (NSUInteger i = 0; i < numberStr.length; i++) {
  [_numbersText addObject:[numberStr substringWithRange:NSMakeRange(i, 1)]];

    NSString *subNumber = [numberStr substringWithRange:NSMakeRange(i, 1)];
    [_replaceArr addObject: [subNumber isEqualToString:@"1"] ? @"0" : subNumber];
  

  }
  }

• (void)configScrollLayers
  {
  //替换1为0，补充宽度占位
  NSString *replaceStr = [_number.stringValue stringByReplacingOccurrencesOfString:@"1" withString:@"0"];

  //得到文字总长度来计算文字剧中
  CGRect tempRect = [replaceStr boundingRectWithSize:CGSizeMake([UIScreen mainScreen].bounds.size.width,CGRectGetHeight(self.frame))options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:@{NSFontAttributeName:self.font} context:nil];

  // 平均分配宽度
  CGFloat height = CGRectGetHeight(self.frame);
  CGFloat starX = (CGRectGetWidth(self.frame) - tempRect.size.width) / 2;
  starX = starX < 0 ? 0 : starX;

  // 创建和配置 scrollLayer
  for (NSUInteger i = 0; i < _numbersText.count; i++) {
  NSString *replaceNumberText = _replaceArr[i];

    //单个文字宽度
    CGFloat width = [replaceNumberText boundingRectWithSize:CGSizeMake(CGRectGetWidth(self.frame),CGRectGetHeight(self.frame))options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:@{NSFontAttributeName:self.font} context:nil].size.width;
  
    CAScrollLayer *layer = [CAScrollLayer layer];
    layer.frame = CGRectMake(starX, 0, width, height);
    [_scrollLayers addObject:layer];
    [self.layer addSublayer:layer];
    
    starX += width;
  
    //文字长度大于控件长度显示省略号，10是默认..省略号的长度
    NSString *numberText = (CGRectGetWidth(self.frame) < tempRect.size.width && (CGRectGetWidth(self.frame) - starX) < 10) ? @".." : _numbersText[i];
    [self configScrollLayer:layer numberText:numberText];
    
    if ([numberText isEqualToString:@".."]) {return;}
  

  }
  }

//小数点逻辑

• (void)configScrollLayer:(CAScrollLayer *)layer numberText:(NSString *)numberText
  {
  NSMutableArray *scrollNumbers = [NSMutableArray array];
  if ([numberText isEqualToString:@"."] || [numberText isEqualToString:@".."]) {
  [scrollNumbers addObject:numberText];
  }else {
  NSInteger number = [numberText floatValue];
  // 添加要滚动的数字
  for (NSInteger i = 0; i < self.density + 1; i++) {
  [scrollNumbers addObject:[NSString stringWithFormat:@"%u", (unsigned int)((number+i) % 10)]];
  }
  [scrollNumbers addObject:numberText];
  }

  // 创建 scrollLayer 的内容，数字降序排序
  // 修改局部变量的值需要使用 __block 修饰符
  __block CGFloat height = 0;
  [scrollNumbers enumerateObjectsWithOptions:NSEnumerationReverse usingBlock:^(NSString *text, NSUInteger idx, BOOL * _Nonnull stop) {
  UILabel *label = [self createLabel:text];
  label.frame = CGRectMake(0, height, CGRectGetWidth(layer.frame), CGRectGetHeight(layer.frame));
  [layer addSublayer:label.layer];
  // 保存label，防止对象被回收
  [_scrollLabels addObject:label];
  // 累加高度
  height = CGRectGetMaxY(label.frame);
  }];
  }