在日常開發(fā)中，可能某個 UITextField 只能輸入數(shù)字，但是因為安裝了第三方鍵盤（搜狗、百度等）會受到影響，需要禁用第三方鍵盤。

禁用第三方鍵盤需要在 AppDelegate.m 中實現(xiàn)以下代碼

- (BOOL)application:(UIApplication *)application
shouldAllowExtensionPointIdentifier:(NSString *)extensionPointIdentifier
{
    if ([extensionPointIdentifier isEqualToString:@"com.apple.keyboard-service"]) {
        return NO;
    }
    return YES;
}

這樣就全局禁用了第三方鍵盤，下面針對某個 UITextField 進行禁用第三方鍵盤

對某個 UITextField 禁用第三方鍵盤

1. 給 UITextField 創(chuàng)建一個分類，然后在分類的 .h 文件中添加一個實例對象屬性 yxc_usingSystemKeyboard 和一個類對象屬性 yxc_globalUsingSystemKeyboard

   @property (nonatomic, assign) BOOL yxc_usingSystemKeyboard;  /**< 使用系統(tǒng)鍵盤 */
   @property (nonatomic, assign, class) BOOL yxc_globalUsingSystemKeyboard;   /**< 全局是否使用系統(tǒng)鍵盤，主動設(shè)置無效 */
   

2. 關(guān)聯(lián)屬性

   - (void)setYxc_usingSystemKeyboard:(BOOL)yxc_usingSystemKeyboard {
       
       objc_setAssociatedObject(self, @selector(yxc_usingSystemKeyboard), @(yxc_usingSystemKeyboard), OBJC_ASSOCIATION_ASSIGN);
   }
   
   - (BOOL)yxc_usingSystemKeyboard {
       
       NSNumber *yxc_usingSystemKeyboard = objc_getAssociatedObject(self, @selector(yxc_usingSystemKeyboard));
       return [yxc_usingSystemKeyboard boolValue];
   }
   
   + (void)setYxc_globalUsingSystemKeyboard:(BOOL)yxc_globalUsingSystemKeyboard {
       
       objc_setAssociatedObject(self, @selector(yxc_globalUsingSystemKeyboard), @(yxc_globalUsingSystemKeyboard), OBJC_ASSOCIATION_ASSIGN);
   }
   
   + (BOOL)yxc_globalUsingSystemKeyboard {
       
       NSNumber *yxc_globalUsingSystemKeyboard = objc_getAssociatedObject(self, @selector(yxc_globalUsingSystemKeyboard));
       return [yxc_globalUsingSystemKeyboard boolValue];
   }
   

3. 監(jiān)聽 UITextFieldTextDidBeginEditingNotification 和 UITextFieldTextDidEndEditingNotification 通知

    [[NSNotificationCenter defaultCenter] addObserver:self
                                            selector:@selector(textFieldDidBeginEdit:)
                                                name:UITextFieldTextDidBeginEditingNotification
                                              object:self];
   
   [[NSNotificationCenter defaultCenter] addObserver:self
                                            selector:@selector(textFieldDidEndEdit:)
                                                name:UITextFieldTextDidEndEditingNotification
                                              object:self];
   

4. 在監(jiān)聽到 UITextFieldTextDidBeginEditingNotification 和 UITextFieldTextDidEndEditingNotification 通知對 yxc_globalUsingSystemKeyboard 值修改

   - (void)textFieldDidBeginEdit:(NSNotification *)notification {
       
       UITextField.yxc_globalUsingSystemKeyboard = self.yxc_usingSystemKeyboard;
   }
   
   - (void)textFieldDidEndEdit:(NSNotification *)notification {
       
       UITextField.yxc_globalUsingSystemKeyboard = NO;
   }
   

5. AppDelegate 中 application:shouldAllowExtensionPointIdentifier: 方法中修改

   - (BOOL)application:(UIApplication *)application shouldAllowExtensionPointIdentifier:(NSString *)extensionPointIdentifier
    {
     if ([extensionPointIdentifier isEqualToString:@"com.apple.keyboard-service"]) {
         if (UITextField.yxc_globalUsingSystemKeyboard) {
             return NO;
         }
     }
     return YES;
   }
   

   通過對某個 UITextField 實例對象設(shè)置 yxc_usingSystemKeyboard 屬性值為 YES 后就對某個 UITextField 禁用了第三方鍵盤.

   效果:

針對某個輸入框禁用第三方鍵盤效果.gif

在這里，第一個輸入框默認(rèn)的樣式，不禁用第三方鍵盤，第二個輸入框禁用第三方鍵盤并且設(shè)置鍵盤樣式為 UIKeyboardTypeNumberPad

代碼