遵守<UIPickerViewDataSource, UIPickerViewDelegate>
//初始化
- (UIPickerView *)pickerView
{
  if (_pickerView == nil) {
      //初始化一个pickerView
      _pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 0, self.bounds.size.width, self.bounds.size.height)];
      //设置背景色
      //设置代理
      _pickerView.delegate = self;
      _pickerView.dataSource = self;
      //默认显示当前的下标
      //        [_pickerView selectRow:3 inComponent:0 animated:NO];
  }
  
  return _pickerView;
}
//返回文字
- (NSString *)getCurrentSelectedInfo
{
  
  
  return string;
}
- (instancetype)initWithFrame:(CGRect)frame
{
  if (self = [super initWithFrame:frame]) {
      [self setupUI];
  }
  return self;
}

- (void)setupUI
{
  // 加载数据
  
  arrayData = [NSMutableArray arrayWithObjects:@"请选择性别",@"男",@"女", nil];
  [self addSubview: self.pickerView];
}

//返回有几列
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
  return 1;
}
//几行
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
  
  return arrayData.count;
}
//返回指定列，行的高度，就是自定义行的高度
- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component{
  return 40.0f;
}
//返回指定列的宽度
- (CGFloat) pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component{
  if (component==0) {//iOS6边框占10+10
      return  self.frame.size.width/2;
  } else if(component==1){
      return  self.frame.size.width/2;
  }
  return  self.frame.size.width/2;
}
//显示的标题
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
  
  return [arrayData objectAtIndex:row];
}
//设置显示的Laber
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
  //设置分割线的颜色
  for(UIView *singleLine in pickerView.subviews)
  {
      if (singleLine.frame.size.height < 1)
      {
          singleLine.backgroundColor = colorText;
      }
  }
  UILabel *genderLabel = [UILabel new];
  genderLabel.textAlignment = NSTextAlignmentCenter;
  genderLabel.text = arrayData[row];
  
  genderLabel.adjustsFontSizeToFitWidth = YES;
  if (selectedRow == row) {
      genderLabel.textColor = colorButton;
  }else{
      genderLabel.textColor = colorText;
  }
  
  return genderLabel;
}
//被选择的行
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
  selectedRow = row;
  [self.pickerView reloadAllComponents];//重点
  string =[arrayData objectAtIndex:row];
}