UISearchBar是由两个subView组成的，一个是UISearchBarBackGround,另一个是UITextField. 要IB中没有直接操作背景的属性。方法是直接将 UISearchBarBackGround移去 

1、修改UISearchBar的背景颜色

UISearchBar是由两个subView组成的，一个是UISearchBarBackGround,另一个是UITextField. 要IB中没有直接操作背景的属性。方法是直接将 UISearchBarBackGround移去  

seachBar=[[UISearchBar alloc] init];
seachBar.backgroundColor=[UIColor clearColor];
for (UIView *subview in seachBar.subviews)
{
if ([subview isKindOfClass:NSClassFromString(@"UISearchBarBackground")])
       {
[subview removeFromSuperview];
break;
}
}

第二种解决的方法：

[[searchbar.subviews objectAtIndex:0]removeFromSuperview];

2、

UISearchBar* m_searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 44, 320, 41)];
m_searchBar.delegate = self;
m_searchBar.barStyle = UIBarStyleBlackTranslucent;
m_searchBar.autocorrectionType = UITextAutocorrectionTypeNo;
m_searchBar.autocapitalizationType = UITextAutocapitalizationTypeNone;
m_searchBar.placeholder = _(@"Search");
m_searchBar.keyboardType =  UIKeyboardTypeDefault;
//为UISearchBar添加背景图片
UIView *segment = [m_searchBar.subviews objectAtIndex:0];
UIImageView *bgImage = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"Images/search_bar_bg.png"]];
[segment addSubview: bgImage];
//<---背景图片
[self.view addSubview:m_searchBar];
[m_searchBar release];

3：取消UISearchBar调用的键盘

[searchBar resignFirstResponder];

添加UISearchBar的两种方法：

代码

UISearchBar *mySearchBar = [[UISearchBar alloc]
initWithFrame:CGRectMake(0.0, 0.0, self.view.bounds.size.width, 45)];
 mySearchBar.delegate = self;
 mySearchBar.showsCancelButton = NO;
 mySearchBar.barStyle=UIBarStyleDefault;
 mySearchBar.placeholder=@"Enter Name or Categary";
mySearchBar.keyboardType=UIKeyboardTypeNamePhonePad;
[self.view addSubview:mySearchBar];
 [mySearchBar release];

在 tableview上添加：   

代码  

//add Table
        UITableView *myBeaconsTableView = [[UITableView alloc]
                                           initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height-40)
  style:UITableViewStylePlain];
        myBeaconsTableView.backgroundColor = [UIColor whiteColor];
        myBeaconsTableView.delegate=self;
        myBeaconsTableView.dataSource=self;
        [myBeaconsTableView setRowHeight:40];
        // Add searchbar
        searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0.0, 0.0, self.view.bounds.size.width, 40)];
        searchBar.placeholder=@"Enter Name";
        searchBar.delegate = self;
        myBeaconsTableView.tableHeaderView = searchBar;
        searchBar.autocorrectionType = UITextAutocorrectionTypeNo;
        searchBar.autocapitalizationType = UITextAutocapitalizationTypeNone;
        [searchBar release];
        [self.view addSubview:myBeaconsTableView];
        [myBeaconsTableView release];

小结：iPhone开发之UISearchBar学习的内容介绍完了，希望本文对你有所帮助

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