iphone keyboard

1.在视图控制器中声明UITextField变量

#import <UIKit/UIKit.h>//#import <UIKeyboard.h>//#import <AppKit/NSEvent.h>@interface keyboardViewController : UIViewController <UITextFieldDelegate> {    IBOutlet UITextField *txt;    }@property (nonatomic,retain) UITextField *txt;@end

2.打开viewDidLoad注释,加入如下代码：

- (void)viewDidLoad{        [[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(keyPressed:) name: UITextFieldTextDidChangeNotification object: nil];    [[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(keyPressed:) name: UITextViewTextDidChangeNotification object: nil];        //We set the delegate so we can grab keypressed    txt=[[UITextField alloc] initWithFrame:CGRectZero];    txt.returnKeyType= UIReturnKeyDone;    txt.delegate = self;    [self.view addSubview:txt];    [txt becomeFirstResponder];  //Show the keyboard    [super viewDidLoad];}

3.键盘响应函数

- (void)keyPressed:(NSNotification*)notification{     NSLog(@"hello");   // NSLog([[notification object] text]);    NSString *str= [[NSString alloc] init];    str=[[notification object] text];    const char *cstring=[str UTF8String];    NSLog(@"%s",cstring);}