iOS之单独使用UISearchBar创建搜索框的示例

这里实现的是进入页面后直接在导航栏上显示搜索框（包含右侧取消按钮），并弹出键盘且搜索框为直接可输入状态（第一响应者），点击右侧取消按钮后收起键盘并返回上一页。

搜索页面

1.实现代理uisearchbardelegate

@interface searchviewcontroller ()<uisearchbardelegate>

2.创建一个uisearchbar为属性

@property (nonatomic, strong) uisearchbar *searchbar;

3.进入页面后弹起键盘和离开页面前收起键盘

- (void)viewdidappear:(bool)animated
{
  [super viewdidappear:animated];
  if (!_searchbar.isfirstresponder) {
    [self.searchbar becomefirstresponder];
  }
}
- (void)viewwilldisappear:(bool)animated
{
  [super viewwilldisappear:animated];
  [self.searchbar resignfirstresponder];
}

4.具体实现

- (void)setbarbuttonitem
{
  //隐藏导航栏上的返回按钮
  [self.navigationitem sethidesbackbutton:yes];
  //用来放searchbar的view
  uiview *titleview = [[uiview alloc] initwithframe:cgrectmake(5, 7, self.view.frame.size.width, 30)];
  //创建searchbar
  uisearchbar *searchbar = [[uisearchbar alloc] initwithframe:cgrectmake(0, 0, cgrectgetwidth(titleview.frame) - 15, 30)];
  //默认提示文字
  searchbar.placeholder = @"搜索内容";
  //背景图片
  searchbar.backgroundimage = [uiimage imagenamed:@"clearimage"];
  //代理
  searchbar.delegate = self;
  //显示右侧取消按钮
  searchbar.showscancelbutton = yes;
  //光标颜色
  searchbar.tintcolor = uicolorfromrgb(0x595959);
  //拿到searchbar的输入框
  uitextfield *searchtextfield = [searchbar valueforkey:@"_searchfield"];
  //字体大小
  searchtextfield.font = [uifont systemfontofsize:15];
  //输入框背景颜色
  searchtextfield.backgroundcolor = [uicolor colorwithred:234/255.0 green:235/255.0 blue:237/255.0 alpha:1];
  //拿到取消按钮
  uibutton *canclebtn = [searchbar valueforkey:@"cancelbutton"];
  //设置按钮上的文字
  [canclebtn settitle:@"取消" forstate:uicontrolstatenormal];
  //设置按钮上文字的颜色
  [canclebtn settitlecolor:[uicolor whitecolor] forstate:uicontrolstatenormal];
  [titleview addsubview:searchbar];
  self.searchbar = searchbar;
  self.navigationitem.titleview = titleview;
}

5.实现代理方法

#pragma mark - uisearchbardelegate
- (bool)searchbarshouldbeginediting:(uisearchbar *)searchbar{
  return yes;
}

- (void)searchbartextdidbeginediting:(uisearchbar *)searchbar {
  searchbar.showscancelbutton = yes;
}

- (void)searchbarsearchbuttonclicked:(uisearchbar *)searchbar
{
  nslog(@"searchbutton");
}

- (void)searchbarcancelbuttonclicked:(uisearchbar *)searchbar
{
  [self.searchbar resignfirstresponder];
  [self.navigationcontroller popviewcontrolleranimated:yes];
}

- (void)searchbartextdidendediting:(uisearchbar *)searchbar
{
  searchbar.showscancelbutton = yes;
}

- (void)searchbar:(uisearchbar *)searchbar textdidchange:(nsstring *)searchtext
{
  nsstring *inputstr = searchtext;
  [self.results removeallobjects];
  for (eldermodel *model in self.dataarray) {
    if ([model.name.lowercasestring rangeofstring:inputstr.lowercasestring].location != nsnotfound) {
      [self.results addobject:model];
    }
  }
  [self.tableview reloaddata];
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。