初始化：UISearchBar繼承于UIView，我們可以像創(chuàng)建View那樣創(chuàng)建searchBar
    UISearchBar * bar = [[UISearchBar alloc]initWithFrame:CGRectMake(20, 100, 250, 40)];    [self.view addSubview:bar];

@property(nonatomic)        UIBarStyle              barStyle; 
這個(gè)屬性可以設(shè)置searchBar的搜索框的風(fēng)格，枚舉如下：
typedef NS_ENUM(NSInteger, UIBarStyle) {    UIBarStyleDefault          = 0,//默認(rèn)風(fēng)格 白色搜索框，多出的背景為灰色    UIBarStyleBlack            = 1,//黑色風(fēng)格，黑色的搜索框    //下面兩個(gè)枚舉已經(jīng)被禁用，作用和黑色風(fēng)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(shè)置搜索框中的文字
 
@property(nonatomic,copy)   NSString               *prompt; 
這個(gè)屬性的官方解釋是在搜索框頂部顯示一行文字，其實(shí)就是背景文字，上圖說明：
   bar.prompt = @"搜索框";   bar.text=@"321111111111111111111111111"

效果如下：
![](http://upload-images.jianshu.io/upload_images/646265-bb7c2dc22740103c.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
 
@property(nonatomic,copy)   NSString               *placeholder;  
和其他文本輸入控件的placeholder相同，在輸入文字時(shí)就會(huì)消失
@property(nonatomic)        BOOL                    showsBookmarkButton; 
是否在搜索框右側(cè)顯示一個(gè)圖書的按鈕，默認(rèn)為NO，YES的效果如下：
![](http://upload-images.jianshu.io/upload_images/646265-4f15754a1bf8623c.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
@property(nonatomic)        BOOL                    showsCancelButton;
是否顯示取消按鈕，默認(rèn)為NO，YES的效果如下：
![](http://upload-images.jianshu.io/upload_images/646265-67324056d98301d5.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
@property(nonatomic)        BOOL                    showsSearchResultsButton;
是否顯示搜索結(jié)果按鈕，默認(rèn)為NO，YES效果如下：
![](http://upload-images.jianshu.io/upload_images/646265-1155a7f69205cab0.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
 
@property(nonatomic, getter=isSearchResultsButtonSelected) BOOL searchResultsButtonSelected ;
設(shè)置搜索結(jié)果按鈕的選中狀態(tài)
- (void)setShowsCancelButton:(BOOL)showsCancelButton animated:(BOOL)animated;
設(shè)置顯示取消按鈕
@property(nonatomic,retain) UIColor *tintColor;
設(shè)置這個(gè)顏色值會(huì)影響搜索框中的光標(biāo)的顏色
 
@property(nonatomic,retain) UIColor *barTintColor;
設(shè)置這個(gè)顏色會(huì)影響搜索框的背景顏色
 
@property (nonatomic) UISearchBarStyle searchBarStyle;
設(shè)置搜索框整體的風(fēng)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(shè)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(gè)試圖，首先要將這個(gè)屬性設(shè)置為YES，之后給按鈕數(shù)組中添加按鈕，使用下面這個(gè)屬性：
@property(nonatomic,copy) NSArray   *scopeButtonTitles ；
設(shè)置選擇按鈕試圖的按鈕標(biāo)題
@property(nonatomic)      NSInteger  selectedScopeButtonIndex;
設(shè)置一個(gè)默認(rèn)的選中按鈕
    bar = [[UISearchBar alloc]initWithFrame:CGRectMake(20, 100, 250, 200)];    bar.showsScopeBar=YES;    bar.scopeButtonTitles = @[@"12",@"2",@"3",@"4"];

![](http://upload-images.jianshu.io/upload_images/646265-2124acef46e94782.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
@property (nonatomic, readwrite, retain) UIView *inputAccessoryView;
鍵盤的附屬試圖
@property(nonatomic,retain) UIImage *backgroundImage;
設(shè)置搜索框的背景圖案
@property(nonatomic,retain) UIImage *scopeBarBackgroundImage;
設(shè)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(duì)方法可以設(shè)置和獲取某個(gè)狀態(tài)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(duì)方法用于設(shè)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(duì)方法用于獲取和設(shè)置搜索欄icon圖片的圖案
- (void)setScopeBarButtonBackgroundImage:(UIImage *)backgroundImage forState:(UIControlState)state; 
- (UIImage *)scopeBarButtonBackgroundImageForState:(UIControlState)state;
這一對(duì)方法用于設(shè)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(duì)方法用于獲取和設(shè)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(duì)方法用于設(shè)置和獲取切換按鈕標(biāo)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(shè)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(biāo)    UISearchBarIconClear, // 清除圖標(biāo)    UISearchBarIconBookmark, // 書本圖標(biāo)    UISearchBarIconResultsList, // 結(jié)果列表圖標(biāo)};

 
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(shí)的回調(diào)，返回為NO，則不能編輯
- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar;                  
已經(jīng)開始編輯時(shí)的回調(diào)
- (BOOL)searchBarShouldEndEditing:(UISearchBar *)searchBar;                
將要結(jié)束編輯時(shí)的回調(diào)
- (void)searchBarTextDidEndEditing:(UISearchBar *)searchBar;                   
已經(jīng)結(jié)束編輯的回調(diào)
- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText;   編輯文字改變的回調(diào)
- (BOOL)searchBar:(UISearchBar *)searchBar shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text ; 
編輯文字改變前的回調(diào)，返回NO則不能加入新的編輯文字
- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar;       
搜索按鈕點(diǎn)擊的回調(diào)
- (void)searchBarBookmarkButtonClicked:(UISearchBar *)searchBar;             
書本按鈕點(diǎn)擊的回調(diào)
- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar;               
取消按鈕點(diǎn)擊的回調(diào)
- (void)searchBarResultsListButtonClicked:(UISearchBar *)searchBar; 
搜索結(jié)果按鈕點(diǎn)擊的回調(diào)
 
- (void)searchBar:(UISearchBar *)searchBar selectedScopeButtonIndexDidChange:(NSInteger)selectedScope;
搜索欄的附加試圖中切換按鈕觸發(fā)的回調(diào)