- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
 if(range.length + range.location > textField.text.length)
 {
 return NO;
 }
 
 NSUInteger newLength = [textField.text length] + [string length] - range.length;
 return newLength <= 5;
}

- (void)textFieldDidChange:(UITextField *)textField
{
 NSString *toBeString = textField.text;

 UITextRange *selectedRange = [textField markedTextRange];
 UITextPosition *position = [textField positionFromPosition:selectedRange.start offset:0];
 
 // 没有高亮选择的字，则对已输入的文字进行字数统计和限制,防止中文被截断
 if (!position){
 if (toBeString.length > _maxLength){
  //中文和emoj表情存在问题，需要对此进行处理
  NSRange rangeRange = [toBeString rangeOfComposedCharacterSequencesForRange:NSMakeRange(0, _maxLength)];
  textField.text = [toBeString substringWithRange:rangeRange];
 }
 }
}

- (void)textFieldDidChange:(UITextField *)textField
{
 NSString *toBeString = textField.text;
 //---字节处理
 NSInteger bytesCount = strlen([textField.text UTF8String]);
 if (bytesCount > _maxBytesLength) {
 NSString *content = [textField.text subStrWithUtf8Len:(int)_maxBytesLength];
 textField.text = content;
 }
}

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
 
 NSString * inputString = [textField.text stringByReplacingCharactersInRange:range withString:string];
 
 //限制字节数
 if ([inputString length] > 0){
 NSInteger len = strlen([inputString UTF8String]);
 if (len > _maxBytesLength){
  return NO;
 }
 else {
  return YES;
 }
 }
 return YES;
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
 return [textField resignFirstResponder];
}

[self.view endEditing:YES];

[[UIApplication sharedApplication] sendAction:@selector(resignFirstResponder) to:nil from:nil forEvent:nil];

[[[UIApplication sharedApplication] keyWindow] endEditing:YES];

{
 UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(fingerTapped:)];
 [self.view addGestureRecognizer:singleTap];
}

#pragma mark- 键盘消失
-(void)fingerTapped:(UITapGestureRecognizer *)gestureRecognizer{
 [self.view endEditing:YES];
}
-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{
 [self.view endEditing:YES];
}

-(BOOL) isTextFieldMatchWithRegularExpression:(NSString *)exporession{
 
 NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",exporession];
 return [predicate evaluateWithObject:self];
}
-(BOOL) isTextFieldIntValue{
 return [self isTextFieldMatchWithRegularExpression:@"[-]{0,1}[0-9]*"];
}
-(BOOL) isTextFieldUnsignedIntValue{
 return [self isTextFieldMatchWithRegularExpression:@"[0-9]+"];
}

- (void)keyboardWillShow:(NSNotification *)notification {
 
 NSDictionary *userInfo = [notification userInfo];
 
 NSValue* aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
 CGRect keyboardRect = [aValue CGRectValue];
 keyboardRect = [self.view convertRect:keyboardRect fromView:nil];
 
 CGFloat keyboardTop = keyboardRect.origin.y;
 
 CGFloat offset = self.normalTextField.frame.size.height + self.normalTextField.frame.origin.y - keyboardTop;
 
 NSValue *animationDurationValue = [userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];
 NSTimeInterval animationDuration;
 [animationDurationValue getValue:&animationDuration];
 
 if(offset > 0){
 // Animate the resize of the text view's frame in sync with the keyboard's appearance.
 [UIView beginAnimations:nil context:NULL];
 [UIView setAnimationDuration:animationDuration];

 CGRect rect = CGRectMake(0.0f, -offset,self.view.frame.size.width,self.view.frame.size.height);
 self.view.frame = rect;
 [UIView commitAnimations];
 }
}

(lldb) po userInfo
{
 UIKeyboardAnimationCurveUserInfoKey = 7;
 UIKeyboardAnimationDurationUserInfoKey = "0.25";
 UIKeyboardBoundsUserInfoKey = "NSRect: {{0, 0}, {414, 226}}";
 UIKeyboardCenterBeginUserInfoKey = "NSPoint: {207, 849}";
 UIKeyboardCenterEndUserInfoKey = "NSPoint: {207, 623}";
 UIKeyboardFrameBeginUserInfoKey = "NSRect: {{0, 736}, {414, 226}}";
 UIKeyboardFrameEndUserInfoKey = "NSRect: {{0, 510}, {414, 226}}";
 UIKeyboardIsLocalUserInfoKey = 1;
}

(lldb) po userInfo
{
 UIKeyboardAnimationCurveUserInfoKey = 7;
 UIKeyboardAnimationDurationUserInfoKey = "0.25";
 UIKeyboardBoundsUserInfoKey = "NSRect: {{0, 0}, {414, 271}}";
 UIKeyboardCenterBeginUserInfoKey = "NSPoint: {207, 623}";
 UIKeyboardCenterEndUserInfoKey = "NSPoint: {207, 600.5}";
 UIKeyboardFrameBeginUserInfoKey = "NSRect: {{0, 510}, {414, 226}}";
 UIKeyboardFrameEndUserInfoKey = "NSRect: {{0, 465}, {414, 271}}";
 UIKeyboardIsLocalUserInfoKey = 1;
}

keyboardRect = [self.view convertRect:keyboardRect fromView:nil];

_textfieldName.keyboardType = UIKeyboardTypeDefault;
_textfieldName.inputType = XXTextFieldTypeOnlyInt;
_textfieldName.maxLength = 5;
_textfieldPwd.inputType = XXTextFieldTypeForbidEmoj;

#import "XXKeyboardManager.h"
@interface XXCorrectVC ()<XXKeyboardManagerShowHiddenNotificationDelegate>
@end

@implementation XXCorrectVC

- (void)viewDidLoad {
 [super viewDidLoad];
 [[XXKeyboardManager sharedInstance] setDelegate:self];
 // Do any additional setup after loading the view from its nib.
}
#pragma mark- KeyBoardShow/Hidden
- (void)showKeyboardWithRect:(CGRect)keyboardRect
    withDuration:(CGFloat)animationDuration
{
 CGFloat offset = self.textFieldCorrect.frame.size.height + self.textFieldCorrect.frame.origin.y - keyboardRect.origin.y;
 if(offset < 0){
  return;
 }
 [UIView animateWithDuration:animationDuration
       delay:0.f
      options:UIViewAnimationOptionCurveEaseInOut animations:^{
  CGRect rect = CGRectMake(0.0f, -offset,self.view.frame.size.width,self.view.frame.size.height);
  self.view.frame = rect;
 } completion:^(BOOL finished) {
  
 }];
}

- (void)hiddenKeyboardWithRect:(CGRect)keyboardRect
     withDuration:(CGFloat)animationDuration
{
 [UIView animateWithDuration:animationDuration
       delay:0.f
      options:UIViewAnimationOptionCurveEaseInOut animations:^{
  self.textFieldCorrect.frame = self.view.bounds;
 } completion:^(BOOL finished) {
 }];
}
@end

/*
 * 键盘要显示的时候
 */
- (void)showKeyboardWithRect:(CGRect)keyboardRect
    withDuration:(CGFloat)animationDuration{
 
 CGSize kbSize = keyboardRect.size;
 
 UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height, 0.0);
 _baseTableView.contentInset = contentInsets;
 _baseTableView.scrollIndicatorInsets = contentInsets;
 
 // If active text field is hidden by keyboard, scroll it so it's visible
 // Your app might not need or want this behavior.
 CGRect aRect = self.view.frame;
 aRect.size.height -= kbSize.height;
 
 if (!CGRectContainsPoint(aRect, _activeCell.frame.origin) ) {
  [_baseTableView scrollRectToVisible:_activeCell.frame animated:YES];
 }
}

/*
 * 键盘要消失的时候
 */
- (void)hiddenKeyboardWithRect:(CGRect)keyboardRect
     withDuration:(CGFloat)animationDuration{
 _baseTableView.contentInset = UIEdgeInsetsZero;
 _baseTableView.scrollIndicatorInsets = UIEdgeInsetsZero;
}