一、UISearchBar的介绍

二、UISearchBar 的常用属性

下面直接用一个例子，阐述UISearchBar的一些属性和设置

UISearchBar *searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(20, 20, SCREEN_WIDTH - 40, 40)];
/** 设置搜索框上一些小控件的图片，状态为UIControlStateNormal和UIControlStateDisabled
 UISearchBarIconSearch          搜索
 UISearchBarIconClear           清除
 UISearchBarIconBookmark        书
 UISearchBarIconResultsList     结果
 tip:图片均使用原始尺寸，所以尺寸需要注意
 */
[searchBar setImage:[UIImage imageNamed:@""] forSearchBarIcon:UISearchBarIconSearch state:UIControlStateNormal];
searchBar.delegate = self;
/** 设置搜索框的类型 */
searchBar.barStyle = UIBarStyleDefault;
/** 显示在顶部的一小行文字 */
searchBar.prompt = @"1111";
/** 在未输入文字时显示的标识字符 */
searchBar.placeholder = @"这是一个搜索框";

/** 显示书，取消，结果按钮 */
searchBar.showsBookmarkButton = YES;
searchBar.showsCancelButton = YES;
searchBar.showsSearchResultsButton = YES;

/** 设置搜索框辅助选择框显示，并设置标题 */
searchBar.showsScopeBar = YES;
searchBar.scopeButtonTitles = @[@"scopeButton1", @"scopeButton2"];
/** 设置搜索框辅助选择框的背景图片和文字属性 */
searchBar.scopeBarBackgroundImage = [UIImage imageWithColor:[UIColor greenColor]];
[searchBar setScopeBarButtonDividerImage:[UIImage imageWithColor:[UIColor redColor]] forLeftSegmentState:UIControlStateNormal rightSegmentState:UIControlStateNormal];
[searchBar setScopeBarButtonTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor orangeColor], NSFontAttributeName : [UIFont systemFontOfSize:10]} forState:UIControlStateNormal];
[searchBar setScopeBarButtonTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor blackColor], NSFontAttributeName : [UIFont systemFontOfSize:20]} forState:UIControlStateSelected];
[self.view addSubview:searchBar];

示例运行结果

三、UISearchBar代理

#pragma mark - delegate
/** 还有一些输入框的文本变化代理，就不一一罗列了 */
/** 点击书 */
- (void)searchBarBookmarkButtonClicked:(UISearchBar *)searchBar {
    NSLog(@"bookmark");
}
/** 点击取消按钮 */
- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar {
    NSLog(@"cancelButton");
    [self.searchBar resignFirstResponder];
}
/** 点击结果按钮 */
- (void)searchBarResultsListButtonClicked:(UISearchBar *)searchBar {
    NSLog(@"resultButton");
}
/** 点击辅助选择按钮 */
- (void)searchBar:(UISearchBar *)searchBar selectedScopeButtonIndexDidChange:(NSInteger)selectedScope {
    NSLog(@"scope:%li", selectedScope);
}