iOS 系统数字键盘左下角加确定按钮

首先在 viewWillAppear 方法中注册监听相应的键盘通知，并且要在 viewWillDisappear 方法中注销通知
- (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated];
//注册键盘显示通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleKeyboardDidShow:) name:UIKeyboardWillShowNotification object:nil];
//注册键盘隐藏通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleKeyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}-(void)viewWillDisappear:(BOOL)animated{ [super viewWillDisappear:animated];
//注销键盘显示通知
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
}

// 键盘出现处理事件
- (void)handleKeyboardDidShow:(NSNotification *)notification
{
// NSNotification中的 userInfo字典中包含键盘的位置和大小等信息
NSDictionary *userInfo = [notification userInfo];
// UIKeyboardAnimationDurationUserInfoKey 对应键盘弹出的动画时间
CGFloat animationDuration = [[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];
// UIKeyboardAnimationCurveUserInfoKey 对应键盘弹出的动画类型
NSInteger animationCurve = [[userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] integerValue];
//数字彩,数字键盘添加“完成”按钮
if (doneInKeyboardButton){ [UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:animationDuration];//设置添加按钮的动画时间
[UIView setAnimationCurve:(UIViewAnimationCurve)animationCurve];//设置添加按钮的动画类型 //设置自定制按钮的添加位置(这里为数字键盘添加“完成”按钮)
doneInKeyboardButton.transform=CGAffineTransformMakeTranslation(, -); [UIView commitAnimations];
}}// 键盘消失处理事件
- (void)handleKeyboardWillHide:(NSNotification *)notification
{
// NSNotification中的 userInfo字典中包含键盘的位置和大小等信息
NSDictionary *userInfo = [notification userInfo];
// UIKeyboardAnimationDurationUserInfoKey 对应键盘收起的动画时间
CGFloat animationDuration = [[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue]; if (doneInKeyboardButton.superview)
{
[UIView animateWithDuration:animationDuration animations:^{
//动画内容，将自定制按钮移回初始位置
doneInKeyboardButton.transform=CGAffineTransformIdentity;
} completion:^(BOOL finished) {
//动画结束后移除自定制的按钮
[doneInKeyboardButton removeFromSuperview];
}]; }
}

#pragma mark -- UITextFieldDelegate
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
//初始化数字键盘的“完成”按钮
if(doneInKeyboardButton.superview==nil)
[self configDoneInKeyBoardButton];
}

- (void) addDoneButton{
//获得键盘所在的window视图
NSArray *array= [[UIApplication sharedApplication]windows]; for (UIWindow *window in array) { NSString *str=NSStringFromClass([window class]); if ([str isEqualToString:@"UIRemoteKeyboardWindow"]) { [window addSubview:doneInKeyboardButton]; } }}//点击“完成”按钮事件，收起键盘
-(void)finishAction{
[[[UIApplication sharedApplication] keyWindow] endEditing:YES];//关闭键盘
}

-(BOOL)application:(UIApplication *)application shouldAllowExtensionPointIdentifier:(NSString *)extensionPointIdentifier{ return NO;
}