一个可以全局使用的键盘监听类-iOS
2020-03-08 本文已影响0人
Dawn_wdf
开发的过程中使用到键盘监听，每个页面都写监听然后再移动页面太繁琐，写了一个类用来全局监听，目前为止基本符合APP开发应用的场景，如果遇到新的问题再更新。代码中使用了ARC，可使用- (void)addObserver:(id)observer selector:(SEL)aSelector name:(nullable NSNotificationName)aName object:(nullable id)anObject;替换。
- 先上使用方法：在APPdelegate的didFinishLaunchingWithOptions中直接子线程设置观察者：
- (void)configKeyboard {
SKeyboardManager *keyboardManager = [[SKeyboardManager alloc] init];
NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter];
//键盘弹出
[[notificationCenter rac_addObserverForName:UIKeyboardWillChangeFrameNotification object:nil] subscribeNext:^(NSNotification * _Nullable x) {
[keyboardManager moveViewsForKeyboardInfo:x];
}];
[[notificationCenter rac_addObserverForName:UIKeyboardWillHideNotification object:nil] subscribeNext:^(NSNotification * _Nullable x) {
[keyboardManager moveViewsForKeyboardInfo:x];
}];
}
- 上面代码中的SKeyboardManager是代码核心，我经常性完全不记得自己写的代码是什么意思，所以我备注写的老全面了~~~~~~
.h
//
// SKeyboardManager.h
// Snatch
//
// Created by DawnWang on 2020/2/9.
// Copyright © 2020 Dawn Wang. All rights reserved.
//
#import <Foundation/Foundation.h>
NS_ASSUME_NONNULL_BEGIN
@interface SKeyboardManager : NSObject
- (void)moveViewsForKeyboardInfo:(NSNotification *)noti;
@end
NS_ASSUME_NONNULL_END
.m
//
// SKeyboardManager.m
// Snatch
//
// Created by DawnWang on 2020/2/9.
// Copyright © 2020 Dawn Wang. All rights reserved.
//
#import "SKeyboardManager.h"
#import "NSObject+TopVC.h"
#import "UIView+FirstResponder.h"
/*全局键盘调用的整体思路
1：获取当前VC：topVC
2：获取当前弹出键盘的视图firstResponderView
3：获取需要做滚动的视图moveView
3.1：找到firstResponderView的supperView是否有具有滚动属性的view
3.2：如果有scrollEbleMoveView则直接返回，即moveView = scrollEbleMoveView，如果没有则返回topVC.view，即moveView = topVC.view
3.3：监听scrollEbleMoveView的contentOffset属性，当属性变化的时候，调用[firstResponderView resignFirstResponder](待定，因为resignFirstResponder也可以在外面使用)
4：将firstResponderView的rect映射到moveView上，映射后的结果是convertRect
5：判断convertRect和键盘frame的位置，并让moveView做相应的移动
*/
@interface SKeyboardManager()
<
UIGestureRecognizerDelegate
>
@property (nonatomic, weak) UIViewController *currentTopVC;
@property (nonatomic, strong) UITapGestureRecognizer *tapGesture;
@property (nonatomic, assign) CGFloat moveDistance;
@end
@implementation SKeyboardManager
- (void)moveViewsForKeyboardInfo:(NSNotification *)noti {
NSDictionary *userInfo = noti.userInfo;
//1：获取当前VC：topVC
UIViewController *topVC = [self s_topViewController];
self.currentTopVC = topVC;
//2：获取当前弹出键盘的视图firstResponderView
UIView *firstResponderView = [topVC.view s_firstResponderView];
//3：获取需要做滚动的视图moveView
UIView *moveView = [self supperNeedMoveViewFrom:firstResponderView];
//如果是可滚动视图，给个监听，获取键盘弹出时最后的偏移量，方便键盘消失时恢复原来的样子
WeakSelf
if ([moveView isKindOfClass:[UIScrollView class]]) {
[[moveView rac_valuesForKeyPath:@"contentOffset" observer:nil] subscribeNext:^(id _Nullable x) {
if (x) {
StrongSelf;
NSValue *value = (NSValue *)x;
CGPoint point = [value CGPointValue];
self.moveDistance = point.y;
}
}];
}
//4：将firstResponderView的rect映射到moveView上，映射后的结果是convertRect
//此处不映射到moveView上是因为键盘打高度是window坐标，而且当前页面没有隐藏导航，或者scrollview位置偏下会造成计算错误
CGRect convertRect = [firstResponderView convertRect:firstResponderView.bounds toView:[UIApplication sharedApplication].keyWindow];
//5：判断convertRect和键盘frame的位置，并让moveView做相应的移动
CGRect originalFrame = moveView.frame;
if ([noti.name isEqualToString:UIKeyboardWillChangeFrameNotification]) {
CGRect keyboardFameEnd = [userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
CGFloat movedDistance = convertRect.origin.y + convertRect.size.height - keyboardFameEnd.origin.y;
//键盘frame有变化且需要移动
if (movedDistance > 0) {
if ([moveView isMemberOfClass:[UIScrollView class]]) {
//如果是可移动视图，直接移动
UIScrollView *scrollView = (UIScrollView *)moveView;
[scrollView setContentOffset:CGPointMake(scrollView.contentOffset.x, scrollView.contentOffset.y + movedDistance) animated:YES];
}else{
//如果是vc.view则重新设置origin.y
[UIView animateWithDuration:[userInfo[UIKeyboardAnimationDurationUserInfoKey] integerValue] animations:^{
moveView.frame = CGRectMake(CGRectGetMinX(originalFrame), originalFrame.origin.y - movedDistance, CGRectGetWidth(originalFrame), CGRectGetHeight(originalFrame));
} completion:^(BOOL finished) {
}];
}
}
}
if ([noti.name isEqualToString:UIKeyboardWillHideNotification]) {
if ([moveView isMemberOfClass:[UIScrollView class]]) {
UIScrollView *scrollView = (UIScrollView *)moveView;
[scrollView setContentOffset:CGPointMake(scrollView.contentOffset.x, scrollView.contentOffset.y - self.moveDistance) animated:YES];
}else{
[UIView animateWithDuration:[userInfo[UIKeyboardAnimationDurationUserInfoKey] integerValue] animations:^{
moveView.frame = CGRectMake(CGRectGetMinX(originalFrame), 0, CGRectGetWidth(moveView.frame), CGRectGetHeight(moveView.frame));
} completion:^(BOOL finished) {
}];
}
}
//topvc tap 收起键盘
if (![topVC.view.gestureRecognizers containsObject:self.tapGesture]) {
UITapGestureRecognizer *tapGes = [[UITapGestureRecognizer alloc] init];
[topVC.view addGestureRecognizer:tapGes];
tapGes.delegate = self;
self.tapGesture = tapGes;
}
__weak typeof(firstResponderView) weakFirstView = firstResponderView;
[[self.tapGesture rac_gestureSignal] subscribeNext:^(__kindof UIGestureRecognizer * _Nullable x) {
__strong typeof(weakFirstView) strongFirstView = weakFirstView;
[strongFirstView resignFirstResponder];
}];
}
//3.1：找到firstResponderView的supperView是否有具有滚动属性的view
//3.2：如果有scrollEbleMoveView则直接返回，即moveView = scrollEbleMoveView，如果没有则返回topVC.view，即moveView = topVC.view
- (UIView *)supperNeedMoveViewFrom:(UIView *)view {
//TODO::辨别可滚动视图
UIView *tempSupperView = view;
while (![NSStringFromClass(tempSupperView.classForCoder) isEqualToString:@"UIViewControllerWrapperView"]) {
if ([tempSupperView isMemberOfClass:[UIScrollView class]]) {
return tempSupperView;
}else{
tempSupperView = tempSupperView.superview;
}
}
return self.currentTopVC.view;
}
//此处修复了一个bug是，UICollectionViewCell的点击操作跟我的键盘收回的手势冲突了
#pragma mark - UIGestureRecognizerDelegate
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
UIView *touchView = touch.view;
BOOL findCell = YES;
while (![touchView.nextResponder isKindOfClass:[UICollectionViewCell class]]) {
if ([NSStringFromClass(touchView.classForCoder) isEqualToString:@"UIViewControllerWrapperView"]) {
findCell = NO;
break;
}
touchView = (UIView *)touchView.nextResponder;
}
return !findCell;
}
@end
- 辅助代码为查找当前试图VC和第一响应者
//
// NSObject+TopVC.m
// Snatch
//
// Created by DawnWang on 2020/2/9.
// Copyright © 2020 Dawn Wang. All rights reserved.
//
#import "NSObject+TopVC.h"
@implementation NSObject (TopVC)
- (UIViewController *)s_topViewController {
UIViewController *currentVC = nil;
UIWindow *window = [UIApplication sharedApplication].keyWindow;
if (window) {
currentVC = window.rootViewController;
}
return [self scanController:currentVC];
}
- (UIViewController *)scanController:(UIViewController *)viewController {
if (!viewController) {
return nil;
}
UIViewController *currentVC = nil;
if ([viewController isKindOfClass:[UINavigationController class]] && ([((UINavigationController *)viewController) topViewController] != nil)) {
//当前根试图是navigationVCm，且topVC不为空
currentVC = [self scanController:[(UINavigationController *)viewController topViewController]];
}else if ([viewController isKindOfClass:[UITabBarController class]] && ([((UITabBarController *)viewController) selectedViewController] != nil)){
//当前根试图是tabbar vc，且selectedVC不为空
currentVC = [self scanController:[(UITabBarController *)viewController selectedViewController]];
}else{
//当前试图是一个标准UIViewController
currentVC = viewController;
//判断是否是present出来的试图
BOOL isPresentController = NO;
UIViewController *presentVC = currentVC.presentedViewController;
while (presentVC) {
currentVC = presentVC;
isPresentController = YES;
presentVC = currentVC.presentedViewController;
}
if (isPresentController) {
currentVC = [self scanController:currentVC];
}
}
return currentVC;
}
@end
//
// UIView+FirstResponder.m
// Snatch
//
// Created by DawnWang on 2020/2/9.
// Copyright © 2020 Dawn Wang. All rights reserved.
//
#import "UIView+FirstResponder.h"
@implementation UIView (FirstResponder)
- (UIView * __nullable)s_firstResponderView {
if ([self isFirstResponder]) {
return self;
}
UIView *firstView = nil;
for (UIView *subView in self.subviews) {
firstView = [subView s_firstResponderView];
if ([firstView isFirstResponder]) {
break;
}
}
return firstView;
}
@end
好了，代码罗列完毕。
- 开发过程中全局控制键盘出现一个超级大bug：XPC connection interrupted，导致页面完全卡死不能动了，原因是在键盘弹出的情况下直接返回上一级页面的时候，当前VC先释放，然后再发送键盘收起的通知，导致
[self s_topViewController]拿不到正确的VC，解决方法是在根navigationController里面重新定义了pop方法：
- (UIViewController *)popViewControllerAnimated:(BOOL)animated {
//fix bug : 当前VC中尚有textfield调起键盘时后返回，导致的：XPC connection interrupted错误
UIViewController * topVC = [self topViewController];
UIView *firstResponse = [topVC.view s_firstResponderView];
[firstResponse resignFirstResponder];
return [super popViewControllerAnimated:animated];
}
最后附上一个小知识点：键盘通知顺序
- 调起键盘通知顺序：
UIKeyboardWillChangeFrameNotification->UIKeyboardWillShowNotification->UIKeyboardDidChangeFrameNotification->UIKeyboardDidShowNotification - 点击小地球切换键盘模式的时候，调用顺序同上，但是只有当键盘frame有变化时才调用；
- 在两个UITextField中切换的时候，通知顺序同上，此时不调用Hide的通知。
- 键盘隐藏时调用顺序：
UIKeyboardWillChangeFrameNotification->UIKeyboardWillHideNotification->UITextFieldTextDidEndEditingNotification->UIKeyboardDidChangeFrameNotification->UIKeyboardDidHideNotification - 题外话：当textfield使用中文输入的时候，点击键盘和输入汉字时都会发送UITextFieldTextDidChangeNotification通知。
