最近寫了一個項目，遇到需要處理鍵盤彈出/收起時，避免鍵盤遮擋輸入框的問題。
所以當時我寫了一個BaseViewController框架（可以用來當做所有ViewController的基類），在BaseViewController設置屬性判斷是否需要處理鍵盤，并且處理了當鍵盤第一次彈出時會出現中文鍵盤高度不對的問題。

github地址：https://github.com/WalkingToTheDistant/KeyboardHandle/tree/master，如果覺得我寫的代碼對你有幫助的話，給我一個星唄^ _ ^

使用方法

設置基類BaseViewController或者其子類的屬性isNeedHandleKeyboard為YES（默認NO），這個變量必須在BaseViewController的ViewDidLoad執行之前設置，因為在BaseViewController的ViewDidLoad里面會執行檢索代碼，給所有輸入框添加鍵盤關閉欄。

/** 是否需要處理鍵盤彈出/收起的事件，默認NO */
@property(nonatomic, assign) BOOL isNeedHandleKeyboard;

代碼解析

首先是添加監聽，這里的邏輯，就是用_isNeedHandleKeyboard來判斷這個ViewController是否需要處理鍵盤


@interface BaseViewController ()

/** 是否需要處理鍵盤彈出/收起的事件，默認NO */
@property(nonatomic, assign) BOOL isNeedHandleKeyboard;

/** 鍵盤彈出時，需要移動的高度值 */
@property(nonatomic, assign) int moveValueForKeyboard;

@end
- (void) viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    
    if(_isNeedHandleKeyboard == YES){ // 添加鍵盤監聽
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleKeyboardShow:) name:UIKeyboardWillShowNotification object:nil];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleKeyboardHide:) name:UIKeyboardWillHideNotification object:nil];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleKeyboardFrameChange:) name:UIKeyboardWillChangeFrameNotification object:nil]; // 監聽鍵盤尺寸的變化
    }
}

- (void) viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    
    if(_isNeedHandleKeyboard == YES){ // 消除鍵盤監聽
        [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
        [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
        [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillChangeFrameNotification object:nil];
    }
}

接下來處理鍵盤彈出/收起的事件

// ****************************************************************************************************
// ****************************************************************************************************
#pragma mark - 鍵盤處理
- (void) handleKeyboardShow:(NSNotification*) notification
{
    if(_moveValueForKeyboard > 0){ // 鍵盤已經處理過，避免在鍵盤輸入的時候再點擊了其他的輸入框
        return;
    }
    
    CGRect keyboardFrame = [[[notification userInfo] valueForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
    const float duration = [[[notification userInfo] valueForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];
    const UIViewAnimationOptions options = [[[notification userInfo] valueForKey:UIKeyboardAnimationCurveUserInfoKey] integerValue];
    
    UIView *viewFirst = [[self class] getFirstResponder:self.view];
    if(viewFirst != nil){
        
        CGPoint pointView = [viewFirst convertPoint:self.view.bounds.origin toView:self.view];
        pointView.y += CGRectGetHeight(viewFirst.frame);
        _keyboardHeight = CGRectGetHeight(keyboardFrame);
        int originYForKeyboard = CGRectGetMaxY(self.view.frame) - _keyboardHeight;
        
        if(pointView.y >= originYForKeyboard){ 
            // 輸入框被鍵盤遮擋
            _moveValueForKeyboard = pointView.y - originYForKeyboard;
            __block CGRect frame = self.view.frame;
            frame.origin.y -= _moveValueForKeyboard;
            
            [UIView animateWithDuration:duration delay:0 options:options animations:^{
                self.view.frame = frame;
            } completion:nil];
        } else {
            _moveValueForKeyboard = 0;
        }
    }
}
- (void) handleKeyboardHide:(NSNotification*)notification
{
    if(_moveValueForKeyboard > 0){
        const float duration = [[[notification userInfo] valueForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];
        const UIViewAnimationOptions options = [[[notification userInfo] valueForKey:UIKeyboardAnimationCurveUserInfoKey] integerValue];
        
        __block CGRect frame = self.view.frame;
        frame.origin.y += _moveValueForKeyboard;
        _moveValueForKeyboard = 0;
        
        [UIView animateWithDuration:duration delay:0 options:options animations:^{
            self.view.frame = frame;
        } completion:nil];
    }
}
- (void) handleKeyboardFrameChange:(NSNotification*)notification
{
    /* 在這里處理中文鍵盤的高度變化問題，在第一次彈出鍵盤之后，鍵盤上隨后會展現中文的智能檢測欄，導致鍵盤的高度會變高，而在UIKeyboardWillShowNotification得到的高度缺不包含這個監測欄的高度，從而輸入框位置會被鍵盤遮擋。所以需要在這里監聽鍵盤尺寸的變化，然后再計算尺寸變化值并修改輸入框的位置。*/
    CGRect keyboardFrame = [[[notification userInfo] valueForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
    if(_moveValueForKeyboard > 0){ // 需要處理中文鍵盤的尺寸變化問題
        int valueChange = CGRectGetHeight(keyboardFrame) - _keyboardHeight;
        if(valueChange != 0){
            const float duration = [[[notification userInfo] valueForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];
            const UIViewAnimationOptions options = [[[notification userInfo] valueForKey:UIKeyboardAnimationCurveUserInfoKey] integerValue];
            __block CGRect frame = self.view.frame;
            frame.origin.y -= valueChange;
            _moveValueForKeyboard += valueChange;
            _keyboardHeight = CGRectGetHeight(keyboardFrame);
            [UIView animateWithDuration:duration delay:0 options:options animations:^{
                self.view.frame = frame;
            } completion:nil];
        }
        
    }
}

這些事件處理需要一個方法輔助，一個是獲取當前鍵盤輸入的控件，然后再獲取其相對屏幕的坐標，用以判斷它是否被鍵盤給遮擋了

/** 獲取當前鍵盤輸入的控件 */
+ (UIView*) getFirstResponder:(UIView*)superView
{
    if(superView.isFirstResponder == YES){
        return superView;
    }
    
    for(UIView *viewChild in superView.subviews){
        if([viewChild isFirstResponder] == YES){
            return viewChild;
        }
    }
    // 再搜索下一層Subview
    for(UIView *viewChild in superView.subviews){
        UIView *viewResult = [[self class] getFirstResponder:viewChild];
        if(viewResult != nil){
            return viewResult;
        }
    }
    return nil;
}

在鍵盤上方添加關閉欄的通用方法。

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    if(_isNeedHandleKeyboard == YES){
        [self addDoneKeyboardViewToInputView:self.view];
    }
}
/** 創建鍵盤關閉的View */
+ (UIView*) getKeyboardHideViewWithTarget:(id)target withSelector:(SEL)selector
{
    UIView *viewResult = [[UIView alloc] initWithFrame:CGRectMake(0, 0, CGRectGetWidth(UIScreen.mainScreen.bounds), 40)];
    [viewResult setBackgroundColor:RGBColor(250, 250, 250)];
    
    int height = CGRectGetHeight(viewResult.frame);
    int width = 80;
    int x = CGRectGetMaxX(viewResult.frame) - width;
    int y = 0;
    UIButton *btnDone = [UIButton buttonWithType:UIButtonTypeSystem];
    [btnDone setTitle:@"完成" forState:UIControlStateNormal];
    [btnDone.titleLabel setFont:Font_Bold(16.0f)];
    [btnDone setFrame:CGRectMake(x, y, width, height)];
    [btnDone addTarget:target action:selector forControlEvents:UIControlEventTouchUpInside];
    [viewResult addSubview:btnDone];
    
    return viewResult;
}
/** 給所有輸入框的鍵盤都添加關閉 */
- (void) addDoneKeyboardViewToInputView:(UIView*) superView
{
    //這個方法可能是有效率問題，因為需要遍歷整個ViewController的view，暫時還想不到更好的方法
    for(UIView *viewChlid in [superView subviews]){
        if([viewChlid isKindOfClass:[UITextField class]] == YES){
            if([viewChlid inputAccessoryView] == nil){
                UIView *viewDone = [[self class] getKeyboardHideViewWithTarget:self withSelector:@selector(closeKeyboard)];
                [((UITextField*)viewChlid) setInputAccessoryView:viewDone];
            }
            
        } else if([viewChlid isKindOfClass:[UITextView class]] == YES){
            if([viewChlid inputAccessoryView] == nil){
                UIView *viewDone = [[self class] getKeyboardHideViewWithTarget:self withSelector:@selector(closeKeyboard)];
                [((UITextView*)viewChlid) setInputAccessoryView:viewDone];
            }
        } else {
            [self addDoneKeyboardViewToInputView:viewChlid];
        }
    }
}
/** 關閉ViewController的鍵盤 */
- (void) closeKeyboard
{
    [self.view endEditing:YES];
}

三个男躁一个女,国精产品一区一手机的秘密,麦子交换系列最经典十句话,欧美国产综合欧美视频

iOS 處理鍵盤彈出的通用框架BaseViewController

iOS 處理鍵盤彈出的通用框架BaseViewController

使用方法

代碼解析

三个男躁一个女,国精产品一区一手机的秘密,麦子交换系列最经典十句话,欧美 国产 综合 欧美 视频

iOS 處理鍵盤彈出的通用框架BaseViewController

使用方法

代碼解析

三个男躁一个女,国精产品一区一手机的秘密,麦子交换系列最经典十句话,欧美国产综合欧美视频