IOS 自定义UIPickView详解及实例代码

最后，我才用的是获取系统图层的方法，在选择器的代理方法里面获取相应的图层，然后进行修改。我们先看一下PickView的图层。

我们只需要在代理方面里面拿到对应的视图然后修改就好

 //Change style
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view{


  CGFloat width = [self pickerView:self.pickerView widthForComponent:component];
  CGFloat rowheight =[self pickerView:self.pickerView rowHeightForComponent:(component)];

  UIView *myView = [[UIView alloc]init];
  myView.frame =CGRectMake(0.0f, 0.0f, width, rowheight);
  UILabel *txtlabel = [[UILabel alloc] init];
  txtlabel.textColor = self.plainColor;
  txtlabel.tag=200;
  txtlabel.font = [UIFont systemFontOfSize:15*SCALE_6];
  txtlabel.textAlignment = NSTextAlignmentCenter;
  txtlabel.frame = myView.frame;
  txtlabel.text = [self pickerView:pickerView titleForRow:row forComponent:component];

  [myView addSubview:txtlabel];

  UIView* topLine  =  [pickerView.subviews objectAtIndex:1];
  UIView* botomLine  =  [pickerView.subviews objectAtIndex:2];
  topLine.hidden = YES;
  botomLine.hidden = YES;

  BOOL isSetttingBackColor = NO;

  UIView *subview = [self.pickerView.subviews firstObject];

  for ( UIView *pickerColumnView in subview.subviews) {

    NSLog(@"pickerColumnView class %@",[pickerColumnView class]);

    UIView *pickerView = [pickerColumnView.subviews lastObject];
    if (!isSetttingBackColor) {
       pickerView.backgroundColor = self.selectedBackColor;
      isSetttingBackColor = !isSetttingBackColor;
    }

    UIView *tableView = [pickerView.subviews lastObject];
    for (UIView *cell in tableView.subviews) {
      NSLog(@"cell class %@",[cell class]);
      UIView *cellview = [cell.subviews lastObject];
      UIView *labelSuper = [cellview.subviews lastObject];
      UILabel *label = [labelSuper.subviews lastObject];
      label.textColor = [UIColor whiteColor];
    }

  }
  return myView;
}

 UIView* topLine  =  [pickerView.subviews objectAtIndex:1];
  UIView* botomLine  =  [pickerView.subviews objectAtIndex:2];
  topLine.hidden = YES;
  botomLine.hidden = YES;