Ios7 自定义工具栏在其边框下方显示AddBarButtonim？？未正确对齐

-（无效）viewDidLoad

{

[超级视图下载]； self.navigationController.navigationBarHidden=NO； tableViewDataSourceMutableArray=[[NSMutableArray alloc]initWithObjects:@“一”，“二”，“三”，“四”，“五”，零]； self.totalData=tableViewDataSourceMutableArray.count

UIImage*img=[UIImage ImageName:@“back.png”]； UIButton*backButton=[UIButton按钮类型：UIButtonTypeCustom]； [backButton设置图像：img for状态：uicontrol状态正常]； backButton.frame=CGRectMake（0,0，img.size.width，img.size.height）； [backButton addTarget:self action:@selector（back）for ControlEvents:UIControlEventTouchDown]； UIBarButtonItem*customBarItem=[[UIBarButtonItem alloc]initWithCustomView:backButton]； self.navigationItem.leftBarButtonItem=customBarItem

---

//添加右栏添加按钮UIBarButtonItem*addBarButton=[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemAdd目标：自我操作：@selector（insertData）]；UIToolbar*工具栏=[[UIToolbar alloc]initWithFrame:cDirectMake（180.0,0,100,30）]；toolBar.barStyle=uibarstyleblacktransparent；toolBar.tintColor=[UIColor blueColor]；toolBar.backgroundColor=[UIColor clearColor]；NSArray*items=[NSArray数组带对象：self.editButtonItem，addBarButton，nil]；[toolBar setItems:items]；uibarbuttonite*barItem=[uibarbuttonite alloc]initWithCustomView:toolBar]；self.navigationItem.rightBarButtonItem=barItem；self.navigationItem.rightBarButtonItem.tintColor=[UIColor clearColor]；self.navigationController.toolbarHidden=YES；//将文本框添加到navigationController标题项headingTextField=[UITextField alloc]initWithFrame:CGRectMake（100,8,100,30）]；headingTextField.backgroundColor=[UIColor magentaColor]；[self.navigationController.navigationBar addSubview:headingTextField]；headingTextField.returnKeyType=UIReturnKeyDone；self.headingTextField.delegate=self；self.headingTextField.placeholder=@“Heading..”；

//Adding Custome Back Navigation Button