Make the Popover with white arrow and white background rectangle - ios

Question

I want to make a customized UIPopover with white arrow and white background rectangle (no round corner). However, when the popover window displayed, the arrow is missing. What should I do to fixed this error. Thanks a lot!
CustomizedPopoverController.h:
#import <UIKit/UIKit.h>
#interface CustomizedPopoverController: UIPopoverBackgroundView
#property (nonatomic, readwrite) CGFloat arrowOffset;
#property (nonatomic, readwrite) UIPopoverArrowDirection arrowDirection;
+ (CGFloat)arrowHeight;
+ (CGFloat)arrowBase;
+ (UIEdgeInsets)contentViewInsets;
#end
CustomizedPopoverController.m:
#import "CustomizedPopoverController.h"
#implementation CustomizedPopoverController
#synthesize arrowDirection = _arrowDirection;
#synthesize arrowOffset = _arrowOffset;
#define ArrowBase 30.0f
#define ArrowHeight 15.0f
#define BorderInset 10.0f
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
[self setBackgroundColor:[UIColor whiteColor]];
}
return self;
}
- (CGFloat) arrowOffset {
return _arrowOffset;
}
- (void) setArrowOffset:(CGFloat)arrowOffset {
_arrowOffset = arrowOffset;
}
- (UIPopoverArrowDirection)arrowDirection {
return _arrowDirection;
}
- (void)setArrowDirection:(UIPopoverArrowDirection)arrowDirection {
_arrowDirection = arrowDirection;
}
+(UIEdgeInsets)contentViewInsets{
return UIEdgeInsetsMake(BorderInset, BorderInset, BorderInset, BorderInset);
}
+(CGFloat)arrowHeight{
return ArrowHeight;
}
+(CGFloat)arrowBase{
return ArrowBase;
}
- (void)layoutSubviews {
[super layoutSubviews];
CGFloat _height = self.frame.size.height;
CGFloat _width = self.frame.size.width;
CGFloat _left = 0.0;
CGFloat _top = 0.0;
CGFloat _coordinate = 0.0;
CGAffineTransform _rotation = CGAffineTransformIdentity;
switch (self.arrowDirection) {
case UIPopoverArrowDirectionUp:
_top += ArrowHeight;
_height -= ArrowHeight;
_coordinate = ((self.frame.size.width / 2) + self.arrowOffset) - (ArrowBase/2);
break;
case UIPopoverArrowDirectionDown:
_height -= ArrowHeight;
_coordinate = ((self.frame.size.width / 2) + self.arrowOffset) - (ArrowBase/2);
_rotation = CGAffineTransformMakeRotation( M_PI );
break;
case UIPopoverArrowDirectionLeft:
_left += ArrowBase;
_width -= ArrowBase;
_coordinate = ((self.frame.size.height / 2) + self.arrowOffset) - (ArrowHeight/2);
_rotation = CGAffineTransformMakeRotation( -M_PI_2 );
break;
case UIPopoverArrowDirectionRight:
_width -= ArrowBase;
_coordinate = ((self.frame.size.height / 2) + self.arrowOffset)- (ArrowHeight/2);
_rotation = CGAffineTransformMakeRotation( M_PI_2 );
break;
}
}
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
// Drawing code
}
*/
#end