初始化：UISearchBar繼承于UIView，我們可以像創建View那樣創建searchBar
UISearchBar * bar = [[UISearchBar alloc]initWithFrame:CGRectMake(20, 100, 250, 40)]; [self.view addSubview:bar];@PRoperty(nonatomic) UIBarStyle barStyle;
這個屬性可以設置searchBar的搜索框的風格，枚舉如下：
typedef NS_ENUM(NSInteger, UIBarStyle) { UIBarStyleDefault = 0,//默認風格 白色搜索框，多出的背景為灰色 UIBarStyleBlack = 1,//黑色風格，黑色的搜索框 //下面兩個枚舉已經被禁用，作用和黑色風格一樣 UIBarStyleBlackOpaque = 1, // Deprecated. Use UIBarStyleBlack UIBarStyleBlackTranslucent = 2, // Deprecated. Use UIBarStyleBlack and set the translucent property to YES};
@property(nonatomic,copy) NSString *text;
設置搜索框中的文字
@property(nonatomic,copy) NSString *prompt;
這個屬性的官方解釋是在搜索框頂部顯示一行文字，其實就是背景文字，上圖說明：
bar.prompt = @"搜索框"; bar.text=@"321111111111111111111111111"效果如下：
@property(nonatomic,copy) NSString *placeholder;
和其他文本輸入控件的placeholder相同，在輸入文字時就會消失
@property(nonatomic) BOOL showsBookmarkButton;
是否在搜索框右側顯示一個圖書的按鈕，默認為NO，YES的效果如下：
@property(nonatomic) BOOL showsCancelButton;
是否顯示取消按鈕，默認為NO，YES的效果如下：
@property(nonatomic) BOOL showsSearchResultsButton;
是否顯示搜索結果按鈕，默認為NO，YES效果如下：
@property(nonatomic, getter=isSearchResultsButtonSelected) BOOL searchResultsButtonSelected ;
設置搜索結果按鈕的選中狀態
- (void)setShowsCancelButton:(BOOL)showsCancelButton animated:(BOOL)animated;
設置顯示取消按鈕
@property(nonatomic,retain) UIColor *tintColor;
設置這個顏色值會影響搜索框中的光標的顏色
@property(nonatomic,retain) UIColor *barTintColor;
設置這個顏色會影響搜索框的背景顏色
@property (nonatomic) UISearchBarStyle searchBarStyle;
設置搜索框整體的風格，枚舉如下：
typedef NS_ENUM(NSUInteger, UISearchBarStyle) { UISearchBarStyleDefault, // currently UISearchBarStyleProminent UISearchBarStyleProminent, // 顯示背景 UISearchBarStyleMinimal // 不顯示背景} NS_ENUM_AVAILABLE_IOS(7_0);
@property(nonatomic,assign,getter=isTranslucent) BOOL translucent;
設置是否半透明
@property(nonatomic) BOOL showsScopeBar ;
是否顯示搜索欄的附件選擇按鈕試圖，要想顯示這個試圖，首先要將這個屬性設置為YES，之后給按鈕數組中添加按鈕，使用下面這個屬性：
@property(nonatomic,copy) NSArray *scopeButtonTitles ；
設置選擇按鈕試圖的按鈕標題
@property(nonatomic) NSInteger selectedScopeButtonIndex;
設置一個默認的選中按鈕
bar = [[UISearchBar alloc]initWithFrame:CGRectMake(20, 100, 250, 200)]; bar.showsScopeBar=YES; bar.scopeButtonTitles = @[@"12",@"2",@"3",@"4"];
@property (nonatomic, readwrite, retain) UIView *inputaccessoryView;
鍵盤的附屬試圖
@property(nonatomic,retain) UIImage *backgroundImage;
設置搜索框的背景圖案
@property(nonatomic,retain) UIImage *scopeBarBackgroundImage;
設置附屬選擇按鈕視圖的背景圖案
- (void)setBackgroundImage:(UIImage *)backgroundImage forBarPosition:(UIBarPosition)barPosition barMetrics:(UIBarMetrics)barMetrics ;
- (UIImage *)backgroundImageForBarPosition:(UIBarPosition)barPosition barMetrics:(UIBarMetrics)barMetrics
這一對方法可以設置和獲取某個狀態枚舉下的搜索框的背景圖案
- (void)setSearchFieldBackgroundImage:(UIImage *)backgroundImage forState:(UIControlState)state;
- (UIImage *)searchFieldBackgroundImageForState:(UIControlState)state;
這一對方法用于設置和獲取搜索框中TextField的背景圖案
- (void)setImage:(UIImage *)iconImage forSearchBarIcon:(UISearchBarIcon)icon state:(UIControlState)state ;
- (UIImage *)imageForSearchBarIcon:(UISearchBarIcon)icon state:(UIControlState)state ;
這一對方法用于獲取和設置搜索欄icon圖片的圖案
- (void)setScopeBarButtonBackgroundImage:(UIImage *)backgroundImage forState:(UIControlState)state;
- (UIImage *)scopeBarButtonBackgroundImageForState:(UIControlState)state;
這一對方法用于設置和獲取搜索框的附加選擇按鈕視圖的背景圖案
- (void)setScopeBarButtonDividerImage:(UIImage *)dividerImage forLeftSegmentState:(UIControlState)leftState rightSegmentState:(UIControlState)rightState;
- (UIImage *)scopeBarButtonDividerImageForLeftSegmentState:(UIControlState)leftState rightSegmentState:(UIControlState)rightState;
這一對方法用于獲取和設置附加選擇按鈕視圖中切換按鈕的圖案
- (void)setScopeBarButtonTitleTextAttributes:(NSDictionary *)attributes forState:(UIControlState)state;
- (NSDictionary *)scopeBarButtonTitleTextAttributesForState:(UIControlState)state;
這一對方法用于設置和獲取切換按鈕標題文字的字體屬性字典
@property(nonatomic) UIOffset searchFieldBackgroundPositionAdjustment;
搜索文字在搜索框中的位置偏移
@property(nonatomic) UIOffset searchTextPositionAdjustment;
textfield在搜索框中的位置偏移
- (void)setPositionAdjustment:(UIOffset)adjustment forSearchBarIcon:(UISearchBarIcon)icon;
- (UIOffset)positionAdjustmentForSearchBarIcon:(UISearchBarIcon)icon;
設置搜索欄中圖片的位置偏移，圖片的枚舉如下：
typedef NS_ENUM(NSInteger, UISearchBarIcon) { UISearchBarIconSearch, //搜索圖標 UISearchBarIconClear, // 清除圖標 UISearchBarIconBookmark, // 書本圖標 UISearchBarIconResultsList, // 結果列表圖標};
下面是搜索框控件的一些代理方法：
- (BOOL)searchBarShouldBeginEditing:(UISearchBar *)searchBar;
將要開始編輯時的回調，返回為NO，則不能編輯
- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar;
已經開始編輯時的回調
- (BOOL)searchBarShouldEndEditing:(UISearchBar *)searchBar;
將要結束編輯時的回調
- (void)searchBarTextDidEndEditing:(UISearchBar *)searchBar;
已經結束編輯的回調
- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText; 編輯文字改變的回調
- (BOOL)searchBar:(UISearchBar *)searchBar shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text ;
編輯文字改變前的回調，返回NO則不能加入新的編輯文字
- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar;
搜索按鈕點擊的回調
- (void)searchBarBookmarkButtonClicked:(UISearchBar *)searchBar;
書本按鈕點擊的回調
- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar;
取消按鈕點擊的回調
- (void)searchBarResultsListButtonClicked:(UISearchBar *)searchBar;
搜索結果按鈕點擊的回調
- (void)searchBar:(UISearchBar *)searchBar selectedScopeButtonIndexDidChange:(NSInteger)selectedScope;
搜索欄的附加試圖中切換按鈕觸發的回調
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