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之前处理键盘遮挡问题都是在每一个控制器进行单独处理，这样做真的是非常的费事，今天在做项目的时候就想到自己封装一个，记录一下这个“跌宕起伏”的过程。
思路是这样的：计算文本编辑控件Frame与键盘Frame，如果遮挡则移动控制器View。
创建控制器类：WKAvoidKeyboardViewController
1 #import <UIKit/UIKit.h> 2 3 @interface WKAvoidKeyboardViewController : UIViewController 4 5 @property (nonatomic, strong) UITextField *editTextField; 6 @property (nonatomic, strong) UITextView *editTextView; 7 8 - (void)hideKeyboard:(NSNotification *)noti; 9 - (void)showKeyboard:(NSNotification *)noti; 10 11 12 @end 13 14 15 #import "WKAvoidKeyboardViewController.h" 16 17 #define GetOSVersion [[UIDevice currentDevice].systemVersion floatValue] 18 19 #define GetTransformDistance(Distance) (GetOSVersion < 7.1 ? Distance / 2 : Distance) 20 21 @interface WKAvoidKeyboardViewController ()<UITextFieldDelegate, UITextViewDelegate> 22 23 @end 24 25 @implementation WKAvoidKeyboardViewController 26 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 27 { 28 [self.view endEditing:YES]; 29 } 30 @end
步骤1：通过通知获取当前编辑的文本控件
//注册通知 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(showKeyboard:) name:UIKeyboardWillShowNotification object:nil]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(hideKeyboard:) name:UIKeyboardWillHideNotification object:nil]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textFieldBeginEditing:) name:UITextFieldTextDidBeginEditingNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textFieldBeginEditing:) name:UITextViewTextDidBeginEditingNotification object:nil];
- (void)textFieldBeginEditing:(NSNotification *)noti { self.editTextField = noti.object; self.editTextView = nil; } - (void)textViewBeginEditing:(NSNotification *)noti { self.editTextView = noti.object; self.editTextField = nil; }
步骤2：通知获取键盘高度
步骤3：计算是否需要移动
#pragma mark - 键盘躲避 - (void)showKeyboard:(NSNotification *)noti { self.view.transform = CGAffineTransformIdentity; UIView *editView = _editTextView ? _editTextView : _editTextField; CGRect tfRect = [editView.superview convertRect:editView.frame toView:self.view]; NSValue *value = noti.userInfo[@"UIKeyboardFrameEndUserInfoKey"]; NSLog(@"%@", value); CGRect keyBoardF = [value CGRectValue]; CGFloat animationTime = [noti.userInfo[@"UIKeyboardAnimationDurationUserInfoKey"] floatValue]; CGFloat _editMaxY = CGRectGetMaxY(tfRect); CGFloat _keyBoardMinY = CGRectGetMinY(keyBoardF); NSLog(@"%f %f", _editMaxY, _keyBoardMinY); if (_keyBoardMinY < _editMaxY) { CGFloat moveDistance = _editMaxY - _keyBoardMinY; [UIView animateWithDuration:animationTime animations:^{ self.view.transform = CGAffineTransformTranslate(self.view.transform, 0, -moveDistance); }]; } } - (void)hideKeyboard:(NSNotification *)noti { // NSLog(@"%@", noti); self.view.transform = CGAffineTransformIdentity; }
初步试验：UITextFiled成功，然后到了UITextView，坑爹的问题粗线了=.=， UITextViewTextDidBeginEditingNotification 发送时间是在键盘弹出通知之后的，导致第一次点击TextView没有用，点击第二次才能产生效果。于是乎，我又开始尝试用TextView的Delegate来做，想当然的使用的代理方法
- (void)textViewDidBeginEditing:(UITextView *)textView
1 - (void)textViewDidBeginEditing:(UITextView *)textView 2 { 3 4 }
令人失望的是textViewDidBeginEditing:方法调用依然是在键盘通知弹出后再调用，此时心中想的是：哔了狗了，让人怎么玩！还是看看其他方法吧。于是在代理方法中看到了
- (BOOL)textViewShouldBeginEditing:(UITextView *)textView
尝试之后，此方法的确在键盘弹出前调用，大功告成，接下来就是设置代理的问题了
设置代理方法如下：
1 - (void)searchTextViewWithView:(UIView *)view 2 { 3 for (UIView *subview in view.subviews) 4 { 5 if ([subview isKindOfClass:[UITextView class]]) { 6 ((UITextView *)subview).delegate = self; 7 } 8 if ([subview isKindOfClass:[UITextField class]]) { 9 ((UITextField *)subview).delegate = self; 10 } 11 [self searchTextViewWithView:subview]; 12 } 13 }
至此大功告成,使用方法：继承WKAvoidKeyboardViewController,如果是用故事版创建的文本控件，啥都不用做，如果是用代码创建的，则需要在ViewDidLoad中调用searchTextViewWithView方法
完整代码下载地址：https://github.com/WuKongCoo1/AvoidKeyboardDemo.git
iOS 处理键盘遮挡TextField、TextView问题
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原文地址：http://www.cnblogs.com/pretty-guy/p/4794002.html
