没有前言，就是一个简单的键盘监听，自动调整输入框的位置不被键盘遮挡
.h
//
// JYKeyBoardListener.h
//
// Created by JianF.Sun on 17/9/26.
// Copyright © 2017年 sjf. All rights reserved.
//
/*
功能：
1、输入框被键盘遮挡时，整个view上移（此时输入框在键盘上方）
2、键盘弹出时，添加一个按钮负责隐藏键盘
3、禁止某控制器使用JYKeyBoardListener
使用：
1、引入JYKeyBoardListener.h
2、程序启动时：[JYKeyBoardListener useJYKeyboardListener];
3、某些控制器不想使用时：[JYKeyBoardListener unUsedIn:vc];
处理：
1、监听键盘 显示，隐藏，退到后台，进入前台；
2、获取当前顶层控制器；
3、获取当前编辑的输入框在self.view中的frame；
4、键盘显示隐藏时动画；
5、隐藏键盘的按钮添加
6、处理push、present时键盘的显示隐藏问题（切记push之前，代码endEditing,因为push操作系统不会自动退出键盘）
7、处理self.view比屏幕小的问题（即self.view没有伸缩到导航栏底部）
8、处理输入框显示在屏幕中不完整的情况 */
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
@interface JYKeyBoardListener : NSObject
//程序启动时调用
+ (void)useJYKeyboardListener;
//在viewcontroller中禁止使用JYKeyBoardListener
+ (void)unUsedIn:(UIViewController*)viewController;
@end
.m
//
// JYKeyBoardListener.m
//
// Created by JianF.Sun on 17/9/26.
// Copyright © 2017年 sjf. All rights reserved.
// #import "JYKeyBoardListener.h" #define KBL_Screen_Height [UIScreen mainScreen].bounds.size.height NSString * const JYKeyboard_Unused_Key= @"JYKeyboard_Unused_Key"; @interface JYKeyBoardListener ()
@property (nonatomic,strong) UIView *inputView;
@property (nonatomic,strong) UIButton *resignBtn;
@property (nonatomic,strong) UIView *lastView;//记录之前一个需要处理的view，解决push,present操作时，键盘的隐藏问题
//@property (nonatomic,strong) UIViewController *unUsedVC; @end
@implementation JYKeyBoardListener #pragma mark - 接口方法，直接调用即可
+ (void)useJYKeyboardListener{ [JYKeyBoardListener shareJYKeyBoardListener];
}
+ (void)unUsedIn:(UIViewController*)viewController{ JYKeyBoardListener *manager = [JYKeyBoardListener shareJYKeyBoardListener];
[[NSUserDefaults standardUserDefaults] setValue:[manager getMemory:viewController] forKey:JYKeyboard_Unused_Key];
} #pragma mark - 单例 + (instancetype)shareJYKeyBoardListener { static JYKeyBoardListener *jyKeyBoardListener = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
jyKeyBoardListener = [[JYKeyBoardListener alloc] init];
// 监听键盘 [[NSNotificationCenter defaultCenter] addObserver:jyKeyBoardListener selector:@selector(keyboardWillShowAction:) name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:jyKeyBoardListener selector:@selector(keyboardWillHideAction:) name:UIKeyboardWillHideNotification object:nil]; [[NSNotificationCenter defaultCenter] addObserver:jyKeyBoardListener selector:@selector(enterBackground:) name:UIApplicationDidEnterBackgroundNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:jyKeyBoardListener selector:@selector(enterForeground:) name:UIApplicationWillEnterForegroundNotification object:nil];
}); return jyKeyBoardListener;
} #pragma mark - 键盘显示和隐藏的监听方法
/**
* 键盘即将弹出
*/
- (void)keyboardWillShowAction:(NSNotification *)note{ if ([self currentMemory]!=nil&&[[self currentMemory] isEqualToString:[self getMemory:[self topViewController]]]) {
[self addResignBtn:[self topViewController].view];
return;
}else{
[[NSUserDefaults standardUserDefaults] setValue:nil forKey:JYKeyboard_Unused_Key];
} //结束时键盘的frame
CGRect endF = [note.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
//键盘高度
CGFloat keyboardH = endF.size.height;
//键盘弹出需要的时间
CGFloat duration = [note.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
//当前的view
UIView *firstRspView = [self findFirstResponsderView]; if (firstRspView==nil) {
// NSLog(@"为空");
return ;
}
//找到输入框
[self findSubView:firstRspView]; //获取输入框相对于当前展示的最底层的那个view的frame
CGRect inputFrame = [self getAbsoluteFrame:self.inputView];
//
CGFloat difH = CGRectGetMaxY(inputFrame)-(KBL_Screen_Height-keyboardH);
// 2.动画
[UIView animateWithDuration:duration animations:^{ if (difH>) { firstRspView.transform = CGAffineTransformMakeTranslation(,-difH); }else{
firstRspView.transform = CGAffineTransformIdentity; }
_lastView = firstRspView;
}completion:^(BOOL finished) {
[self addResignBtn:firstRspView]; } ];
}
/**
* 键盘即将隐藏
*/
- (void)keyboardWillHideAction:(NSNotification *)note{ //判断当前控制器是否被禁用
if ([self currentMemory]!=nil&&[[self currentMemory] isEqualToString:[self getMemory:[self topViewController]]]) { return;
}else{
[[NSUserDefaults standardUserDefaults] setValue:nil forKey:JYKeyboard_Unused_Key];
}
// 1.键盘弹出需要的时间
CGFloat duration = [note.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
UIView *firstRspView = [self findFirstResponsderView]; if(firstRspView==nil){
return;
}
if (_lastView&&_lastView!=firstRspView) {//处理跳转时恢复之前的，push之前必须 _lastView.transform = CGAffineTransformIdentity;
_lastView = nil;
return;
}
// 2.动画
[UIView animateWithDuration:duration animations:^{
firstRspView.transform = CGAffineTransformIdentity; }completion:^(BOOL finished) { }]; } #pragma mark - 前台后台切换处理
- (void)enterBackground:(NSNotification*)note{
[[self findFirstResponsderView] endEditing:YES];
}
- (void)enterForeground:(NSNotification*)note{ }
#pragma mark - 隐藏键盘按钮
- (void)addResignBtn:(UIView*)firstRspView{
if (self.resignBtn) {
[self.resignBtn removeFromSuperview];
}
self.resignBtn = [UIButton buttonWithType:UIButtonTypeCustom];
self.resignBtn.backgroundColor = [UIColor clearColor];
[self.resignBtn addTarget:self action:@selector(hideKeyboard) forControlEvents:UIControlEventTouchUpInside];
self.resignBtn.frame = firstRspView.bounds;
[firstRspView addSubview:self.resignBtn];
[firstRspView sendSubviewToBack:self.resignBtn];
}
- (void)hideKeyboard{
[[self findFirstResponsderView] endEditing:YES];
dispatch_async(dispatch_get_main_queue(), ^{
[self.resignBtn removeFromSuperview]; });
}
#pragma mark - 其他辅助性方法
/**
查找根控制器的view @return return FirstResponsderView
*/
- (UIView*)findFirstResponsderView{ UIViewController *returnVC; //查找当前的根控制器
returnVC = [self topViewController];
if (returnVC) {
return returnVC.view;
}else{
return nil;
}
}
// 获取当前屏幕显示的ViewController
- (UIViewController *)topViewController {
UIViewController *resultVC;
resultVC = [self _topViewController:[[UIApplication sharedApplication].keyWindow rootViewController]];
while (resultVC.presentedViewController) {
resultVC = [self _topViewController:resultVC.presentedViewController];
}
return resultVC;
} - (UIViewController *)_topViewController:(UIViewController *)vc {
if ([vc isKindOfClass:[UINavigationController class]]) {
return [self _topViewController:[(UINavigationController *)vc topViewController]];
} else if ([vc isKindOfClass:[UITabBarController class]]) {
return [self _topViewController:[(UITabBarController *)vc selectedViewController]];
} else {
return vc;
}
return nil;
} /*
获取输入框的相对于根控制器view的frame
*/
- (CGRect)getAbsoluteFrame:(UIView*)view{ UIView *mainView = [self findFirstResponsderView];
UIWindow *window = [UIApplication sharedApplication].keyWindow;
CGRect rect=[view convertRect: view.bounds toView:mainView];
//处理导航栏问题
if (CGRectGetHeight(mainView.bounds)<CGRectGetHeight(window.bounds)) {
rect.origin.y += CGRectGetHeight(window.bounds)-CGRectGetHeight(mainView.bounds);
}
//滚动视图返回的frame去掉scrollView.contentOffset.y
if ([mainView isKindOfClass:[UIScrollView class]]||[mainView isKindOfClass:[UITableView class]]||[mainView isKindOfClass:[UIWebView class]]) {
UIScrollView *scrollView = (UIScrollView*)mainView;
rect.origin.y -=scrollView.contentOffset.y;
if (CGRectGetMaxY(rect)>KBL_Screen_Height) {//输入框没有完全显示出来 //去掉屏幕外的高度值
rect.origin.y-=CGRectGetMaxY(rect)-KBL_Screen_Height;
}
} return rect;
} /*
递归法
找到输入框
*/
- (void)findSubView:(UIView*)view{ for (UIView *subView in view.subviews){ if ([subView isFirstResponder]) {
// NSLog(@"找到输入框");
self.inputView = subView;
}else{
[self findSubView:subView];
}
}
} - (NSString*)getMemory:(UIViewController*)vc{
//控制器名称+内容的内存地址+view的内容地址
return [NSString stringWithFormat:@"jykeyboard%@%p%p",NSStringFromClass([vc class]),vc,vc.view];
}
- (NSString*)currentMemory{
return [[NSUserDefaults standardUserDefaults] valueForKey:JYKeyboard_Unused_Key];
}
@end