关于UISearchBar在tableHeaderView的情况

self.tableView.tableHeaderView = self.searchBar;

- (UISearchBar *)searchBar {
    if (_searchBar == nil)
    {
        _searchBar = [[UISearchBar alloc]initWithFrame:CGRectMake(0, 0, kScreenWidth-80, 40)];
        _searchBar.placeholder = @"搜索";
        _searchBar.searchBarStyle = 0;
        _searchBar.delegate = self;
// 边框颜色
        _searchBar.backgroundImage = [self createImageWithColor:kRGBA(242, 242, 242, 1)];
        UITextField *searchField = [_searchBar valueForKey:@"searchField"];
        if (searchField) {
            [searchField setBackgroundColor:[UIColor whiteColor]];
            [searchField setValue:kGrayColor forKeyPath:@"_placeholderLabel.textColor"];
            // 修正光标颜色
            [searchField setTintColor:kGrayColor];
        }
    }
    return _searchBar;
}

#pragma mark - 根据颜色获取图片
- (UIImage *)createImageWithColor:(UIColor *)color
{
    //图片尺寸
    CGRect rect = CGRectMake(0, 0, 10, 10);
    //填充画笔
    UIGraphicsBeginImageContext(rect.size);
    //根据所传颜色绘制
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, color.CGColor);
    //显示区域
    CGContextFillRect(context, rect);
    // 得到图片信息
    UIImage * image = UIGraphicsGetImageFromCurrentImageContext();
    //消除画笔
    UIGraphicsEndImageContext();
    return image;
}

代理方法

- (BOOL)searchBarShouldBeginEditing:(UISearchBar *)searchBar
{
    //隐藏取消按钮
    searchBar.showsCancelButton = NO;

    return YES;
}

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
{
    // 当text改变 就会调用
}