动态获取键盘高度

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本文介绍了一种在iOS应用中动态获取键盘高度的方法。通过监听键盘显示和隐藏的通知，可以捕获到键盘的高度信息（例如，在iOS 5系统中英文输入时键盘高度为216）。这种方法有助于改善用户体验，特别是在文本输入频繁的应用场景中。

动态获取键盘高度：

//需要手动调用 registerForKeyboardNotifications 方法，其他两个会自动调用，弹出的键盘高 216(输入英文时候)，ios 5 系统的
 
@implementation ViewController
 
 
- (void)viewDidLoad
 
{
 
    [super viewDidLoad];
 
    [self registerForKeyboardNotifications];
 
    UITextView *tv = [[UITextView alloc] initWithFrame:CGRectMake(100, 100, 100, 50)];
 
    [self.view addSubview:tv];
 
    [tv release];
 
}
 
- (void) registerForKeyboardNotifications
 
{
 
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasShown:) name:UIKeyboardDidShowNotification object:nil];
 
     
 
    [[NSNotificationCenter defaultCenter]  addObserver:self selector:@selector(keyboardWasHidden:) name:UIKeyboardDidHideNotification object:nil];
 
}
 
 
- (void) keyboardWasShown:(NSNotification *) notif
 
{
 
    NSDictionary *info = [notif userInfo];
 
    NSValue *value = [info objectForKey:UIKeyboardFrameBeginUserInfoKey];
 
    CGSize keyboardSize = [value CGRectValue].size;
 
     
 
    NSLog(@"keyBoard:%f", keyboardSize.height);  //216
 
    ///keyboardWasShown = YES;
 
}
 
- (void) keyboardWasHidden:(NSNotification *) notif
 
{
 
    NSDictionary *info = [notif userInfo];
 
     
 
    NSValue *value = [info objectForKey:UIKeyboardFrameBeginUserInfoKey];
 
    CGSize keyboardSize = [value CGRectValue].size;
 
    NSLog(@"keyboardWasHidden keyBoard:%f", keyboardSize.height);
 
    // keyboardWasShown = NO;
 
     
 
}
 
 
- (void)didReceiveMemoryWarning
 
{
 
    [super didReceiveMemoryWarning];
 
    // Dispose of any resources that can be recreated.
 
}
 
 
@end