iphone开发：键盘事件

       
UIKIT_EXTERN NSString *const UITextInputCurrentInputModeDidChangeNotification__OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_4_2);
有这个通知

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(changeMode:) name:@"UITextInputCurrentInputModeDidChangeNotification" object:nil];
然后实现上面的方法：
-(void) changeMode:(NSNotification *)notification{
NSLog(@"%@",[[UITextInputMode currentInputMode] primaryLanguage]);
}
这样就能拿到值了。
下面是LOG结果：
2011-07-18 14:32:48.565 UIFont[2447:207] zh-Hans //简体汉字拼音
2011-07-18 14:32:50.784 UIFont[2447:207] en-US   //英文
2011-07-18 14:32:51.344 UIFont[2447:207] zh-Hans //简体手写
2011-07-18 14:32:51.807 UIFont[2447:207] zh-Hans //简体笔画
2011-07-18 14:32:53.271 UIFont[2447:207] zh-Hant //繁体手写
2011-07-18 14:32:54.062 UIFont[2447:207] zh-Hant //繁体仓颉
2011-07-18 14:32:54.822 UIFont[2447:207] zh-Hant //繁体笔画
通过LOG看到，我们当前只能拿到用户以何种语言输入。不过对于当前的大部分应用来说，这个已经足够了。
直接获取方式：
[[UITextInputMode currentInputMode] primaryLanguage];

 其实它返回的是个UIKeyboardInputMode类，这个是私有API 并不只有primaryLanguage这一个属性 看下面

@interface UIKeyboardInputMode : UITextInputMode
{
    NSString *primaryLanguage;
    NSString *identifier;
    NSString *softwareLayout;
    NSString *hardwareLayout;
}

+ (id)keyboardInputModeWithIdentifier:(id)arg1;
+ (id)hardwareLayoutFromIdentifier:(id)arg1;
+ (id)softwareLayoutFromIdentifier:(id)arg1;
+ (id)canonicalLanguageIdentifierFromIdentifier:(id)arg1;
@property(retain, nonatomic) NSString *hardwareLayout; // @synthesize hardwareLayout;
@property(retain, nonatomic) NSString *softwareLayout; // @synthesize softwareLayout;
@property(retain, nonatomic) NSString *identifier; // @synthesize identifier;
@property(retain, nonatomic) NSString *primaryLanguage; // @synthesize primaryLanguage;
- (void)dealloc;
- (id)initWithIdentifier:(id)arg1;

@end

就可以根据@property(retain, nonatomic) NSString *hardwareLayout; // @synthesize hardwareLayout;
@property(retain, nonatomic) NSString *softwareLayout; // @synthesize softwareLayout;
@property(retain, nonatomic) NSString *identifier; // @synthesize identifier;
@property(retain, nonatomic) NSString *primaryLanguage; // @synthesize primaryLanguage;
这几个属性判断

NSLog(@"%@",[(UIKeyboardInputMode*)[UITextInputMode currentInputMode] identifier]);
可以根据identifier判断，每种都不同的，你可以log出来看看

根据indentifier

    UITextInputMode* inputMode = [UITextInputMode currentInputMode];
    NSString* indentifier = [inputMode performSelector:NSSelectorFromString(@"identifier")];
    NSLog(@"%@",indentifier);
    //简体笔画　zh_Hans-Wubihua@sw=Wubihua;hw=US
    //简体手写　zh_Hans-HWR@sw=HWR
    //简体拼音 zh_Hans-Pinyin@sw=Pinyin;hw=US
    //英语 en_US@hw=US;sw=QWERTY

摘自 云怀空－abel