searchbar的使用介绍

时间：2021-06-29 05:09:49

searchBar的使用介绍

首先如何创建一个SearchBar实例：

self.searchBar = [[UISearchBar alloc] initWithFrame: CGRectMake(0.0, 20, self.view.bounds.size.width, 40)];

    self.searchBar.placeholder=@"搜索";

    self.searchBar.showsCancelButton = YES;//显示右边的取消按钮。

    self.searchBar.keyboardType = UIKeyboardTypeDefault;//键盘类型

    self.searchBar.autocorrectionType = UITextAutocorrectionTypeNo;//自动修正

    self.searchBar.autocapitalizationType = UITextAutocapitalizationTypeNone;//首字母大写

我们还需要设置代理，然后实现这个里面的方法：

    //遵循协议:UISearchBarDelegate

    下面是这个协议的方法:

    @protocol UISearchBarDelegate <UIBarPositioningDelegate>

    @optional

    - (BOOL)searchBarShouldBeginEditing:(UISearchBar *)searchBar;                      // return NO to not become first responder

    - (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar;                     // called when text starts editing

    - (BOOL)searchBarShouldEndEditing:(UISearchBar *)searchBar;                        // return NO to not resign first responder

    - (void)searchBarTextDidEndEditing:(UISearchBar *)searchBar;                       // called when text ends editing

    - (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText;   // called when text changes (including clear)

    - (BOOL)searchBar:(UISearchBar *)searchBar shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text NS_AVAILABLE_IOS(3_0); // called before text changes

    - (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar;                     // called when keyboard search button pressed

    - (void)searchBarBookmarkButtonClicked:(UISearchBar *)searchBar;                   // called when bookmark button pressed

    - (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar;                     // called when cancel button pressed

    - (void)searchBarResultsListButtonClicked:(UISearchBar *)searchBar NS_AVAILABLE_IOS(3_2); // called when search results button pressed

    - (void)searchBar:(UISearchBar *)searchBar selectedScopeButtonIndexDidChange:(NSInteger)selectedScope NS_AVAILABLE_IOS(3_0);

    @end

如何消除searchBar中的背景:

    //    如何将背景消除：首先我们在调试窗口，打出self.searchBar的层次结构。然后根据这个结构将UISearchBar中的背景视图给remove。我们这样就实现删除背景颜色的效果

    [[[[self.searchBar.subviews objectAtIndex:0] subviews] objectAtIndex:0] removeFromSuperview];

如何打出层次结构：

在命令行中，使用recursiveDescription打印出UIView的层次结构，

例如：

po [self.searchBar recursiveDescription]

    //打印出得结果为：

    <UISearchBar: 0x7ba7f6d0; frame = (0 20; 320 40); text = ''; gestureRecognizers = <NSArray: 0x7ba8cf20>; layer = <CALayer: 0x7ba881f0>>

       | <UIView: 0x7ba8b530; frame = (0 0; 320 40); clipsToBounds = YES; autoresize = W+H; layer = <CALayer: 0x7ba8b5a0>>

       |    | <UISearchBarBackground: 0x7ba8d480; frame = (0 0; 320 40); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x7ba8d670>>

       |    | <UISearchBarTextField: 0x7b7745a0; frame = (0 0; 0 0); text = ''; clipsToBounds = YES; opaque = NO; layer = <CALayer: 0x7b7737e0>>

       |    |    | <_UISearchBarSearchFieldBackgroundView: 0x7b778390; frame = (0 0; 0 0); opaque = NO; autoresize = W+H; userInteractionEnabled = NO; layer = <CALayer: 0x7b777df0>>

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