iOS 键盘遮挡输入框的解决方案

第三方：
TPKeyboardAvoiding
或者
防止键盘挡住输入框
- (void)viewDidLoad{
//注册监听，防止键盘遮挡视图
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}
- (void)viewDidDisappear:(BOOL)animated{
[super viewDidDisappear:animated];

[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
}
- (void) dealloc{
[[NSNotificationCenter defaultCenter] removeObserver:selfname:nilobject:nil];
}
#pragma mark - textField
- (void)textFieldDidBeginEditing:(UITextField *)textField{
top = self.mainTableView.contentOffset.y;//该输入框的偏移量
clickFlg = textField.tag;//判断点击了哪个输入框
}
#pragma mark - 监听
- (void)keyboardWillShow:(NSNotification *)notification {

/*
Reduce the size of the text view so that it's not obscured by the keyboard.
Animate the resize so that it's in sync with the appearance of the keyboard.
*/
NSDictionary *userInfo = [notification userInfo];

// Get the origin of the keyboard when it's displayed.
NSValue* aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
// Get the top of the keyboard as the y coordinate of its origin in self's view's coordinate system. The bottom of the text view's frame should align with the top of the keyboard's final position.
CGRect keyboardRect = [aValue CGRectValue];
keyboardRect = [self.viewconvertRect:keyboardRect fromView:nil];

CGFloat keyboardTop = keyboardRect.origin.y;
CGRect newTextViewFrame = self.view.bounds;
newTextViewFrame.size.height = keyboardTop - self.view.bounds.origin.y;

// Get the duration of the animation.
NSValue *animationDurationValue = [userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];
NSTimeInterval animationDuration;
[animationDurationValue getValue:&animationDuration];
animationDuration += 0.1f;
// Animate the resize of the text view's frame in sync with the keyboard's appearance.
[UIView beginAnimations:nil context:NULL];
[UIViewsetAnimationDuration:animationDuration];

CGFloat clickTop = 0;
//64:顶部高度
clickTop = CGRectGetHeight(self.mainTableView.tableHeaderView.frame) + [self tableView:self.mainTableView heightForRowAtIndexPath:[NSIndexPath indexPathForRow:clickFlg inSection:0]]*(clickFlg+1) + 64;
if (keyboardTop > 0 && keyboardTop < clickTop) {
[self.mainTableViewsetContentOffset:CGPointMake(0, fabsf(keyboardTop - clickTop)) animated:YES];
}
//[self.mainScrollView setContentOffset:CGPointMake(0, keyboardTop) animated:YES];
[UIView setAnimationTransition:UIViewAnimationTransitionNone forView:self.view cache:YES];

[UIView commitAnimations];
}
- (void)keyboardWillHide:(NSNotification *)notification {

NSDictionary* userInfo = [notification userInfo];

/*
Restore the size of the text view (fill self's view).
Animate the resize so that it's in sync with the disappearance of the keyboard.
*/
NSValue *animationDurationValue = [userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];
NSTimeInterval animationDuration;
[animationDurationValue getValue:&animationDuration];

[UIView beginAnimations:nil context:NULL];
[UIViewsetAnimationDuration:animationDuration];

[self.mainScrollView setContentOffset:CGPointMake(0, 0) animated:YES];
[UIView commitAnimations];
}

// 点击背景退出键盘
UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(backupgroupTap:)];
tapGestureRecognizer.numberOfTapsRequired = 1;
[self.view addGestureRecognizer: tapGestureRecognizer];   // 只需要点击非文字输入区域就会响应
[tapGestureRecognizer setCancelsTouchesInView:NO];
-(void)backupgroupTap:(id)sender{
[self.phoneField resignFirstResponder];
}
**********************************************************************************************************************************
CGFloat _bottom;
CGPoint _oldOffset;
CGFloat _keyboardTop;
#pragma mark - 键盘遮挡输入框处理
// 监听键盘弹出通知
- (void) registerForKeyboardNotifications {
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter]  addObserver:self selector:@selector(keyboardWillHidden:) name:UIKeyboardWillHideNotification object:nil];
}
- (void)unregNotification {
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
}
// 开始编辑输入框，获得输入框底部在屏幕上的绝对位置
-(void)textFieldDidBeginEditing:(UITextField *)textField {
[self registerForKeyboardNotifications];
UIWindow *window=[[[UIApplication sharedApplication] delegate] window];
CGRect rect=[textField convertRect: textField.bounds toView:window]; // 在屏幕上的坐标
_bottom = rect.origin.y + rect.size.height; // 获得输入框底部在屏幕上的绝对位置
}
// 键盘弹出，获得键盘高度，计算界面需要偏移的距离
- (void) keyboardWillShow:(NSNotification *) notification {
_oldOffset = self.mainScrollView.contentOffset;
[self unregNotification];
NSDictionary *userInfo = [notification userInfo];

// Get the origin of the keyboard when it's displayed.
NSValue* aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
// Get the top of the keyboard as the y coordinate of its origin in self's view's coordinate system. The bottom of the text view's frame should align with the top of the keyboard's final position.
CGRect keyboardRect = [aValue CGRectValue];
keyboardRect = [self.view convertRect:keyboardRect fromView:nil];
_keyboardTop = keyboardRect.origin.y;

// 计算出需要偏移的距离offset，即输入框bottom与键盘top的距离
float offset = _bottom - _keyboardTop;
if(offset > 0) { // offset为正，说明输入框被键盘遮挡
NSTimeInterval animationDuration = 0.3f;
[UIView beginAnimations:@"ResizeForKeyboard" context:nil];
[UIView setAnimationDuration:animationDuration];
offset += 5;
self.mainScrollView.contentOffset = CGPointMake(0, _oldOffset.y + offset);
[UIView commitAnimations];
}
}
//键盘隐藏，将视图恢复到原始状态
- (void) keyboardWillHidden:(NSNotification *) notif {
self.mainScrollView.contentOffset = _oldOffset;
}

- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];

//add notification
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(keyboardChange:) name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(keyboardChange:) name:UIKeyboardWillHideNotification object:nil];
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(keyboardChange:) name:UIKeyboardWillChangeFrameNotification object:nil];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
[[NSNotificationCenter defaultCenter]removeObserver:self];
}
-(void)keyboardChange:(NSNotification *)notification
{
NSDictionary *userInfo = [notification userInfo];
NSTimeInterval animationDuration;
UIViewAnimationCurve animationCurve;
CGRect keyboardEndFrame;

[[userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] getValue:&animationCurve];
[[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] getValue:&animationDuration];
[[userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] getValue:&keyboardEndFrame];

[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:animationDuration];
[UIView setAnimationCurve:animationCurve];

//adjust ChatTableView's height
if (notification.name == UIKeyboardWillShowNotification || notification.name == UIKeyboardWillChangeFrameNotification) {
self.bottomConstraint.constant = keyboardEndFrame.size.height;
}else{
self.bottomConstraint.constant = 0;
}

[self.view layoutIfNeeded];

//adjust UUInputFunctionView's originPoint
CGRect newFrame = self.viewPing.frame;
newFrame.origin.y = keyboardEndFrame.origin.y - newFrame.size.height;
self.viewPing.frame = newFrame;

[UIView commitAnimations];

}

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
self.loginBtn.layer.cornerRadius=4.0;
self.loginBtn.backgroundColor=[UIColor colorWithRed:248.0/255 green:181.0/255 blue:18.0/255 alpha:1];
self.bgview.userInteractionEnabled=YES;
UITapGestureRecognizer *singalTap=[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(backKeyboard)];
[self.view addGestureRecognizer:singalTap];
self.password.tag=0;
[self.password addTarget:self action:@selector(textFieldDidBeginEditing:) forControlEvents:UIControlEventEditingDidBegin];

[self.password addTarget:self action:@selector(textFieldDidEndEditing:) forControlEvents:UIControlEventEditingDidEnd];

// Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(void)backKeyboard{
[self.bgview endEditing:YES];
}
-(void)textFieldDidBeginEditing:(UITextField *)textField{
if (textField.tag==0) {
[self moveView:-68];
}

}
-(void)textFieldDidEndEditing:(UITextField *)textField{
if (textField.tag==0) {
[self moveView:68];
}

}
-(void)moveView:(float )move{
NSTimeInterval animationDuration=0.30f;
CGRect frame=self.bgview.frame;
frame.origin.y+=move;
[UIView beginAnimations:@"ResizeViewFrame" context:nil];
[UIView setAnimationDuration:animationDuration];
self.bgview.frame=frame;
[self.bgview layoutIfNeeded];
[UIView commitAnimations];
}
@end