ALKeyboradCenter

ALKeyboradCenter封装NSNotificationCenter监听键盘事件,对NSNotificationCenter进行包装，专注于处理键盘事件UIKeyboardWillShowNotification、UIKeyboardWillHideNotification、UIKeyboardWillChangeFrameNotification。

监听键盘事件可以实现输入框与键盘的联动以及其他功能。

####一.封装内容

键盘事件消息封装: 封装了NSNotificationCenter有关键盘事件的三个消息，并针对不同iOS版本进行兼容处理;
键盘事件回调封装: 使用KeyboardWillShowBlcok和keyboardWillHideBlock两个Block来实现键盘事件回调，使用更加方便、代码更加集中;
键盘事件参数封装: 使用NSKeyboradNotification类封装了键盘的消息userInfo信息,并通过block返回,这样查看键盘事件参数更加直观、使用更加方便;

####二.方法说明

/*!
 *  @brief 添加键盘事件监听者
 *
 *  @param observer      observer为weak弱引用
 *  @param willShowBlcok KeyboardWillShowBlcok会被copy
 *  @param willHideBlock keyboardWillHideBlock会被copy
 */
-(void)addObserver:(id)observer
          willShow:(ALKeyboardWillShowBlcok)willShowBlcok
          willHide:(ALKeyboardWillHideBlock)willHideBlock;

此方法中observer不会被retain，willShowBlock和willHideBlock会被copy;

[[ALKeyboradCenter defaultCenter] removeKeyBoradObserver:self]; 必须在dealloc中解除键盘事件监听，否则当前congtroller将得不到释放。willShowBlock和willHideBlock中不应该直接使用self或者成员变量，否则将产生循环引用问题。

####三.使用步骤:

podfile中添加ALKeyboradCenter;

在工程XXXX-Prefix.pch文件中添加import；

 #import <ALKeyboradCenter/ALKeyboradCenter.h>

在init方法中addObserver
因为KeyboardWillShowBlcok和keyboardWillHideBlock的内容都是会被copy的，所以Blocks内容中不能出现self或者是当前类的成员变量，否则会引起循环引用;

 - (void)viewDidLoad
 {
     [super viewDidLoad];
     self.view.backgroundColor=[UIColor whiteColor];
     // Do any additional setup after loading the view, typically from a nib.
     
     //controller监听键盘事件
     __weak typeof(self) weakSelf = self;
     [[ALKeyboradCenter defaultCenter] addObserver:self
                                          willShow:^(ALKeyboradNotification *keyboradObj) {
                                              //处理keyboradObj
                                              //将UIWindow坐标系的keyboardFrameEnd转换为self.view坐标系的keyboardFrameEnd_View
 										    CGRect keyboardFrameEnd_View = [weakSelf.view convertRect:keyboradObj.keyboardFrameEnd fromView:keyboradObj.fromView];
 										    
 										    /* Move the toolbar to above the keyboard */
 										    [UIView beginAnimations:nil context:NULL];
 										    [UIView setAnimationDuration:keyboradObj.keyboardAnimationDuration];
 										    [UIView setAnimationCurve:keyboradObj.keyboradAnimationCurve];
 										    [UIView setAnimationBeginsFromCurrentState:YES];
 										    
 										    CGRect frame = self.textField.frame;
 										    frame.origin.y= keyboardFrameEnd_View.origin.y - self.textField.frame.size.height;//键盘高度
 										    self.textField.frame = frame;
 										    
 										    [UIView commitAnimations];

                                          }
                                          willHide:^(ALKeyboradNotification *keyboradObj) {
 											//同上
                                          }
      ];
 }

dealloc中解除键盘监听

 -(void)dealloc{
     [[ALKeyboradCenter defaultCenter] removeKeyBoradObserver:self];
     
 }

维护者

alex520biao alex520biao@163.com

License

ALKeyboradCenter is available under the MIT license. See the LICENSE file for more info.

alex520biao/ALKeyboradCenter

ALKeyboradCenter

维护者

License