项目中有很多输入框，有输入框就会唤出键盘，唤出键盘就很经常键盘挡住输入框。如何解决这个问题？

这个问题并不难，相信大家都会写。但是写多了大家就会发现，项目中这么多页面有输入框的，那就意味着很多地方都要写，而且写的代码都差不多。那有没有方便点的，全局控制控制器的view跟随键盘起伏，或者调用一句代码就可以搞定的？

针对这个问题，为此我实现了一句话设置当前控制器的view跟随键盘起伏。

代码不多只有轻量级的两个类：

看看效果：

实现思路 主要代码实现：

1、监听输入框开始编辑，键盘改变的通知

// TextField开始编辑[[NSNotificationCenter defaultCenter] addObserver:instance selector:@selector(textFieldTextDidBeginEditingNotification:) name:UITextFieldTextDidBeginEditingNotificationobject:nil];// TextView开始编辑[[NSNotificationCenter defaultCenter] addObserver:instance selector:@selector(textViewTextDidBeginEditingNotification:) name:UITextViewTextDidBeginEditingNotificationobject:nil];// 键盘将要改变[[NSNotificationCenter defaultCenter] addObserver:instance selector:@selector(keyboardWillChangeFrameNotification:) name:UIKeyboardWillChangeFrameNotification object:nil];复制代码

2、获取当前的控制器，判断键盘是否挡住输入框，然后计算偏移view

/// 偏移View
-(void)transformView:(NSNotification *)notification {//获取键盘弹出后的RectNSValue *keyBoardEndBounds=[[notification userInfo]objectForKey:UIKeyboardFrameEndUserInfoKey];CGRect  endRect=[keyBoardEndBounds CGRectValue];UIView *targetView;if ([self.inputObject isKindOfClass:[UIView class]]) {targetView = self.inputObject;}if (!targetView) {return;}UIViewController *vc = [self getCurrentVC];// targetView 在 toView 的 convertRect位置上的位置CGRect targetRect = [targetView convertRect:CGRectMake(0, 0, targetView.frame.size.width, targetView.frame.size.height) toView:vc.view];CGFloat height = [UIScreen mainScreen].bounds.size.height;CGFloat maxY = CGRectGetMaxY(targetRect);CGFloat cha = endRect.origin.y - maxY;if (maxY > endRect.origin.y) { // 键盘会挡住输入框if ([vc.view.subviews.firstObject isKindOfClass:[UIScrollView class]]) {// 如果self.view是UIScrollView，则滚动contentOffsetUIScrollView *scrollView= vc.view.subviews.firstObject;//NSLog(@"%@",NSStringFromCGPoint(scrollView.contentOffset));scrollView.contentOffset = CGPointMake(0, scrollView.contentOffset.y + (-cha) + 10);}else {CGFloat interval = 0;if (cha < -10) {interval = 10;}[UIView animateWithDuration:0.25f animations:^{[vc.view setFrame:CGRectMake(vc.view.frame.origin.x, cha - interval, vc.view.frame.size.width, vc.view.frame.size.height)];}];}}if (endRect.origin.y == height) { //键盘回收 deltaY>100//NSLog(@"键盘回收");if ([vc.view.subviews.firstObject isKindOfClass:[UIScrollView class]]) {//UIScrollView *scrollView= self.view.subviews.firstObject;//NSLog(@"%@",NSStringFromCGPoint(scrollView.contentOffset));}else {[UIView animateWithDuration:0.25f animations:^{[vc.view setFrame:CGRectMake(0, 0, vc.view.frame.size.width, vc.view.frame.size.height)];}];self.inputObject = nil;self.keyboardNotifivation = nil;}}
}复制代码

使用方式有两种：

第一种：只导入JHKeyBoardManager.h这个类到项目中，在AppDelegate写一句代码即可

#import "JHKeyBoardManager.h"
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {[JHKeyBoardManager sharedManager];return YES;
}复制代码

第二种：只导入UIViewController+KeyBoardManager.h这个类到项目中，要用的控制器只需掉用一个方法即可

#import "UIViewController+KeyBoardManager.h"
- (void)viewDidLoad {[super viewDidLoad];[self transformViewForKeyboard];
}复制代码

demo地址：github.com/iOSHJH/JHKe…

有问题欢迎issues，若项目对你有用还望不吝给个star让我动力十足?