//当键盘出现或改变时调用
- (void)keyboardWillShow:(NSNotification *)aNotification
{
NSDictionary *userInfo = [aNotification userInfo];
NSValue *aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
CGRect keyboardRect = [aValue CGRectValue];
CGFloat height = keyboardRect.size.height;
CGFloat offset = CGRectGetMaxY(self.urlInput.frame) + 10 - (CGRectGetMaxY(self.view.bounds) - height);
NSNumber *durationNum = [userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];
CGFloat duration = [durationNum floatValue];
if (offset > 0)
{
[UIView animateWithDuration:duration animations:^{
self.view.frame = CGRectMake(0,-offset, CGRectGetWidth(self.view.frame), CGRectGetHeight(self.view.frame));
}];
}
}
//当键退出时调用
- (void)keyboardWillHide:(NSNotification *)aNotification
{
NSDictionary *userInfo = [aNotification userInfo];
NSNumber *durationNum = [userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];
CGFloat duration = [durationNum floatValue];
[UIView animateWithDuration:duration animations:^{
self.view.frame = CGRectMake(0, 0, CGRectGetWidth(self.view.frame), CGRectGetHeight(self.view.frame));
}];
}
原文：http://www.cnblogs.com/danMing-love/p/7079728.html