轉載：https://my.oschina.net/u/2340880/blog/509756
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];
1. 屬性介紹
- @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：圖
-
*@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：圖
-
@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(tài)
-
-(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視圖，要想顯示這個視圖，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;
鍵盤的附屬視圖
-
*@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
2. 方法介紹
1. -(void)setBackgroundImage:(UIImage *)backgroundImage forBarPosition:(UIBarPosition)barPosition barMetrics:(UIBarMetrics)barMetrics ;
2. -(UIImage *)backgroundImageForBarPosition:(UIBarPosition)barPosition barMetrics:(UIBarMetrics)barMetrics
- 這一對方法可以設置和獲取某個狀態(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
3. 特殊的兩個方法和屬性
-
@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
};
4. 代理方法
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(fā)的回調
