SearchBar自定义

    UISearchBar *searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 260, self.view.frame.size.width - 16, 35)];
    searchBar.searchBarStyle = UISearchBarStyleMinimal;
    searchBar.placeholder = @"请输入关键字";
    [searchBar setImage:[UIImage imageNamed:@"test_sousuo"] forSearchBarIcon:UISearchBarIconSearch state:UIControlStateNormal]; //替换收缩放大镜
    [searchBar setImage:[UIImage imageNamed:@"test_quxiao"] forSearchBarIcon:UISearchBarIconClear state:UIControlStateNormal]; //输入的时候，右侧的清除按钮
    [searchBar setSearchFieldBackgroundImage:[UIImage imageNamed:@"sousuokuang"] forState:UIControlStateNormal]; //输入背景框
    //改变提示文字颜色
    UITextField *sbTextField = [searchBar valueForKey:@"searchField"]; //首先取出textfield
    sbTextField.textColor = [UIColor blueColor]; //输入的颜色
    UILabel *sbPlaceholderLabel = [sbTextField valueForKey:@"placeholderLabel"]; //然后取出textField的placeHolder
    sbPlaceholderLabel.textColor = [UIColor redColor]; //改变颜色
    searchBar.delegate = self;
    //取消按钮有显示的时候
    searchBar.showsCancelButton = YES;
    UIButton *cancelBtn = [searchBar valueForKey:@"cancelButton"]; //首先取出cancelBtn
    cancelBtn.enabled = YES;
    //这样就可以随便设置这个按钮了
    [cancelBtn setTitle:@"搜索" forState:UIControlStateNormal];
    [self.view addSubview:searchBar];