iOS全局处理键盘事件

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注册监听键盘事件的通知

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[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(keyboardWillShow:)
                                             name:UIKeyboardWillShowNotification
                                           object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(keyboardShow:)
                                             name:UIKeyboardDidShowNotification
                                           object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(keyboardWillHide:)
                                             name:UIKeyboardWillHideNotification
                                           object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(keyboardHide:)
                                             name:UIKeyboardDidHideNotification
                                           object:nil];

在键盘将要出现和隐藏的回调中，加入动画

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- (void)keyboardWillShow:(NSNotification *)notif {
    if (self.hidden == YES) {
        return;
    }
    CGRect rect = [[notif.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
    CGFloat y = rect.origin.y;
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.25];
    NSArray *subviews = [self subviews];
    for (UIView *sub in subviews) {
        CGFloat maxY = CGRectGetMaxY(sub.frame);
        if (maxY > y - 2) {
            sub.center = CGPointMake(CGRectGetWidth(self.frame)/2.0, sub.center.y - maxY + y - 2);
        }
    }
    [UIView commitAnimations];
}
- (void)keyboardShow:(NSNotification *)notif {
    if (self.hidden == YES) {
        return;
    }
}
- (void)keyboardWillHide:(NSNotification *)notif {
    if (self.hidden == YES) {
        return;
    }
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.25];
    NSArray *subviews = [self subviews];
    for (UIView *sub in subviews) {
        if (sub.center.y < CGRectGetHeight(self.frame)/2.0) {
            sub.center = CGPointMake(CGRectGetWidth(self.frame)/2.0, CGRectGetHeight(self.frame)/2.0);
        }
    }
    [UIView commitAnimations];
}
- (void)keyboardHide:(NSNotification *)notif {
    if (self.hidden == YES) {
        return;
    }
}