iOS 處理鍵盤遮擋TextField、TextView問題

iOS 處理鍵盤遮擋TextField、TextView問題
iOS 處理鍵盤遮擋TextField、TextView問題 　　之前處理鍵盤遮擋問題都是在每一個控制器進行單獨處理，這樣做真的是非常的費事，今天在做項目的時候就想到自己封裝一個，記錄一下這個“跌宕起伏”的過程。 　　思路是這樣的：計算文本編輯控制項Frame與鍵盤Frame，如果遮擋則移動控制器View。 　　建立控制器類：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 @end13 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 @end24 25 @implementation WKAvoidKeyboardViewController26 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event27 {28     [self.view endEditing:YES];29 }30 @end

 

 　　步驟1：通過通知擷取當前編輯的文本控制項  

//註冊通知    [[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;}

 

  　　步驟2：通知擷取鍵盤高度 　　步驟3：計算是否需要移動 　　 

#pragma mark - 鍵盤躲避- (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;}

 

　　初步實驗：UITextFiled成功，然後到了UITextView，坑爹的問題粗線了=.=， UITextViewTextDidBeginEditingNotification 發送時間是在鍵盤彈出通知之後的，導致第一次點擊TextView沒有用，點擊第二次才能產生效果。於是乎，我又開始嘗試用TextView的Delegate來做，想當然的使用的代理方法 - (void)textViewDidBeginEditing:(UITextView *)textView 1 - (void)textViewDidBeginEditing:(UITextView *)textView2 {3     4 }　　令人失望的是textViewDidBeginEditing:方法調用依然是在鍵盤通知彈出後再調用，此時心中想的是：嗶了狗了，讓人怎麼玩！還是看看其他方法吧。於是在代理方法中看到了 - (BOOL)textViewShouldBeginEditing:(UITextView *)textView 　　嘗試之後，此方法的確在鍵盤彈出前調用，大功告成，接下來就是設定代理的問題了 　　設定代理方法如下： 

 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：繼承WKAvoidKeyboardViewController,如果是用故事版建立的文本控制項，啥都不用做，如果是用代碼建立的，則需要在ViewDidLoad中調用searchTextViewWithView方法