iOS 数字键盘完成键

- (void)viewWillAppear:(BOOL)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];

[super viewWillAppear:animated];
}

-(void)viewWillDisappear:(BOOL)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];

[super viewWillDisappear:animated];
}

// 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=CGAffineTransformTranslate(doneInKeyboardButton.transform, 0, -53);

[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];
}];

}
}

//点击输入框
- (IBAction)editingDidBegin:(id)sender{

//初始化数字键盘的“完成”按钮
[self configDoneInKeyBoardButton];
}

//初始化，数字键盘“完成”按钮
- (void)configDoneInKeyBoardButton{
CGFloat screenHeight = [UIScreen mainScreen].bounds.size.height;
//初始化
if (doneInKeyboardButton == nil)
{
doneInKeyboardButton = [[UIButton buttonWithType:UIButtonTypeCustom] retain];
[doneInKeyboardButton setTitle:@"完成" forState:UIControlStateNormal];
[doneInKeyboardButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

doneInKeyboardButton.frame = CGRectMake(0, screenHeight, 106, 53);

doneInKeyboardButton.adjustsImageWhenHighlighted = NO;
[doneInKeyboardButton addTarget:self action:@selector(finishAction) forControlEvents:UIControlEventTouchUpInside];
}
//每次必须从新设定“完成”按钮的初始化坐标位置
doneInKeyboardButton.frame = CGRectMake(0, screenHeight, 106, 53);

//由于ios8下，键盘所在的window视图还没有初始化完成，调用在下一次 runloop 下获得键盘所在的window视图
[self performSelector:@selector(addDoneButton) withObject:nil afterDelay:0.0f];

}

- (void) addDoneButton{
//获得键盘所在的window视图
UIWindow* tempWindow = [[[UIApplication sharedApplication] windows] objectAtIndex:1];
[tempWindow addSubview:doneInKeyboardButton];    // 注意这里直接加到window上

}

//点击“完成”按钮事件，收起键盘
-(void)finishAction{
[[[UIApplication sharedApplication] keyWindow] endEditing:YES];//关闭键盘
}