具有许多按钮的Xcode iPad UIActionSheet不能正确显示iOS7

在iPad上,新的ios 7 UIActionSheet没有正确显示许多按钮.

不清理UIActionSheet的滚动背景.这些按钮似乎在背景UIActionSheet中冻结.

screenshot with problem

我的代码：

UIActionSheet *popupQuery = [[UIActionSheet alloc]; 
for (int i=0; i<[ParamAllList count]; i++) 
{ 
    NSMutableDictionary *Param = [ParamAllList objectATindex:i]; 
    [popupQuery addButtonWithtitle:[Param valueForKey:@"name"]]; 
    [[[popupQuery valueForKey:@"_buttons"] objectATindex:[[popupQuery valueForKey:@"_buttons"] count]-1] setImage:[UIImage imagenamed:@"add40icon.png"] forState:UIControlStateNormal];
} 
popupQuery.actionSheetStyle = UIActionSheetStyleAutomatic; 
[popupQuery showFromRect:Button_SetTings.frame inView:Button_SetTings.superview animated:YES];

- (void)willPresentActionSheet:(UIActionSheet *)actionSheet {
    actionSheet.BACkgroundColor = [UIColor whiteColor];
    for (UIView *subview in actionSheet.subviews) {
        subview.BACkgroundColor = [UIColor whiteColor];
    }
}