UISearchBar去掉背景

seachBar=[[UISearchBar alloc] init];

//修改搜索框背景

seachBar.backgroundColor=[UIColor clearColor];

//去掉搜索框背景

//1.

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

//2.

for (UIView *subview in seachBar.subviews)

{ 

if ([subview isKindOfClass:NSClassFromString(@"UISearchBarBackground")])

{ 

[subview removeFromSuperview]; 

break; 

} 

}

//3自定义背景

UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"40-di.png"]];

    [mySearchBar insertSubview:imageView atIndex:1];

    [imageView release];

//4输入搜索文字时隐藏搜索按钮，清空时显示

- (BOOL)searchBarShouldBeginEditing:(UISearchBar *)searchBar { 

searchBar.showsScopeBar = YES; 

[searchBar sizeToFit]; 

[searchBar setShowsCancelButton:YES animated:YES]; 

return YES; 

} 

- (BOOL)searchBarShouldEndEditing:(UISearchBar *)searchBar { 

searchBar.showsScopeBar = NO; 

[searchBar sizeToFit]; 

[searchBar setShowsCancelButton:NO animated:YES]; 

return YES; 

} 

//改变搜索按钮文字

//改变UISearchBar取消按钮字体

for(id cc in [searchBar subviews])

    {

if([cc isKindOfClass:[UIButton class]])

        {

            UIButton *btn = (UIButton *)cc;

            [btn setTitle:@"搜索"  forState:UIControlStateNormal];

        }

    }