UIPickerView

遵守<UIPickerViewDataSource, UIPickerViewDelegate>
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];
  }