1、UISearchBar的基本属性
```
// 初始化
_searchBar = [[UISearchBar alloc] initWithFrame:CGRectZero];
[self.searchBar setPlaceholder:@"Search"];// 搜索框的占位符
[self.searchBar setPrompt:@"Prompt"];// 顶部提示文本,相当于控件的Title
[self.searchBar setBarStyle:UIBarMetricsDefault];// 搜索框样式
[self.searchBar setTintColor:[UIColor blackColor]];// 搜索框的颜色，当设置此属性时，barStyle将失效
[self.searchBar setTranslucent:YES];// 设置是否透明
[self.searchBar setBackgroundImage:[UIImage imageNamed:@"image0"]];// 设置背景图片
[self.searchBar setSearchFieldBackgroundImage:[UIImage imageNamed:@"image3"] forState:UIControlStateNormal];// 设置搜索框中文本框的背景
[self.searchBar setSearchFieldBackgroundImage:[UIImage imageNamed:@"image0"] forState:UIControlStateHighlighted];
[self.searchBar setSearchFieldBackgroundPositionAdjustment:UIOffsetMake(30, 30)];// 设置搜索框中文本框的背景的偏移量
[self.searchBar setSearchResultsButtonSelected:NO];// 设置搜索结果按钮是否选中
[self.searchBar setShowsSearchResultsButton:YES];// 是否显示搜索结果按钮
[self.searchBar setSearchTextPositionAdjustment:UIOffsetMake(30, 0)];// 设置搜索框中文本框的文本偏移量
[self.searchBar setInputAccessoryView:_btnHide];// 提供一个遮盖视图
[self.searchBar setKeyboardType:UIKeyboardTypeEmailAddress];// 设置键盘样式
// 设置搜索框下边的分栏条
[self.searchBar setShowsScopeBar:YES];// 是否显示分栏条
[self.searchBar setScopeButtonTitles:[NSArray arrayWithObjects:@"Singer",@"Song",@"Album", nil]];// 分栏条，栏目
[self.searchBar setScopeBarBackgroundImage:[UIImage imageNamed:@"image3"]];// 分栏条的背景颜色
[self.searchBar setSelectedScopeButtonIndex:1];// 分栏条默认选中的按钮的下标
[self.searchBar setShowsBookmarkButton:YES];// 是否显示右侧的“书图标”
[self.searchBar setShowsCancelButton:YES];// 是否显示取消按钮
[self.searchBar setShowsCancelButton:YES animated:YES];
// 是否提供自动修正功能（这个方法一般都不用的）
[self.searchBar setSpellCheckingType:UITextSpellCheckingTypeYes];// 设置自动检查的类型
[self.searchBar setAutocorrectionType:UITextAutocorrectionTypeDefault];// 是否提供自动修正功能，一般设置为UITextAutocorrectionTypeDefault
self.searchBar.delegate = self;// 设置代理
[self.searchBar sizeToFit];
myTableView.contentInset = UIEdgeInsetsMake(CGRectGetHeight(self.searchBar.bounds), 0, 0, 0);
[self.view addSubview:myTableView];
[myTableView addSubview:self.searchBar];
```
#2.代理方法
```
//搜索框中的内容发生改变时 回调（即要搜索的内容改变）
- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText{
NSLog(@"changed");
if (_searchBar.text.length == 0) {
[self setSearchControllerHidden:YES]; //控制下拉列表的隐现
}else{
[self setSearchControllerHidden:NO];
}
}
- (BOOL)searchBarShouldBeginEditing:(UISearchBar *)searchBar {
searchBar.showsCancelButton = YES;
for(id cc in [searchBar subviews])
{
if([cc isKindOfClass:[UIButton class]])
{
UIButton *btn = (UIButton *)cc;
[btn setTitle:@"取消" forState:UIControlStateNormal];
}
}
NSLog(@"shuould begin");
return YES;
}
- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar {
searchBar.text = @"";
NSLog(@"did begin");
}
- (void)searchBarTextDidEndEditing:(UISearchBar *)searchBar {
NSLog(@"did end");
searchBar.showsCancelButton = NO;
}
- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar {
NSLog(@"search clicked");
}
//点击搜索框上的 取消按钮时 调用
- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar {
NSLog(@"cancle clicked");
_searchBar.text = @"";
[_searchBar resignFirstResponder];
[self setSearchControllerHidden:YES];
}
```