iOS开发之监听键盘高度的变化 分类： ios技术 2015-04-21 12:04 233人阅读 评论(0) 收藏

最近做的项目中，有一个类似微博中的评论转发功能，屏幕底端有一个输入框用textView来做，当textView成为第一响应者的时候它的Y值随着键盘高度的改变而改变，保证textView紧贴着键盘，但又不会被键盘挡住。

下面是我实现的方法：（利用通知）

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// 键盘通知     // 键盘的frame发生改变时发出的通知（位置和尺寸）     //    UIKeyboardWillChangeFrameNotification     //    UIKeyboardDidChangeFrameNotification     // 键盘显示时发出的通知     //    UIKeyboardWillShowNotification     //    UIKeyboardDidShowNotification     // 键盘隐藏时发出的通知     //    UIKeyboardWillHideNotification     //    UIKeyboardDidHideNotification           [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChangeFrame:) name:UIKeyboardWillChangeFrameNotification object:nil];//在这里注册通知

下面是监听通知：

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#pragma mark - 监听方法 /**  * 键盘的frame发生改变时调用（显示、隐藏等）  */ - (void)keyboardWillChangeFrame:(NSNotification *)notification {     //    if (self.picking) return;     /**      notification.userInfo = @{      // 键盘弹出隐藏后的frame      UIKeyboardFrameEndUserInfoKey = NSRect: {{0, 352}, {320, 216}},      // 键盘弹出隐藏所耗费的时间      UIKeyboardAnimationDurationUserInfoKey = 0.25,      // 键盘弹出隐藏动画的执行节奏（先快后慢，匀速）      UIKeyboardAnimationCurveUserInfoKey = 7      }      */           NSDictionary *userInfo = notification.userInfo;           // 动画的持续时间     doubleduration = [userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];           // 键盘的frame     CGRect keyboardF = [userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];           // 执行动画     [UIView animateWithDuration:duration animations:^{         // 工具条的Y值 == 键盘的Y值 - 工具条的高度         if(keyboardF.origin.y > self.view.height) { // 键盘的Y值已经远远超过了控制器view的高度             self.toolbar.y = self.view.height - self.toolbar.height;//这里的<span style="background-color: rgb(240, 240, 240);">self.toolbar就是我的输入框。</span>           }else{             self.toolbar.y = keyboardF.origin.y - self.toolbar.height;         }     }]; }

当然，这里我为UIView写了一个类别，实现如下：

.h文件中声明

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@interfaceUIView (Extension) @property(nonatomic, assign) CGFloat x; @property(nonatomic, assign) CGFloat y; @property(nonatomic, assign) CGFloat width; @property(nonatomic, assign) CGFloat height; @property(nonatomic, assign) CGFloat centerX; @property(nonatomic, assign) CGFloat centerY; @property(nonatomic, assign) CGSize size; @property(nonatomic, assign) CGPoint origin; @end

.m文件中实现（重写setter 和 getter）

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@implementationUIView (Extension)   - (void)setX:(CGFloat)x {     CGRect frame = self.frame;     frame.origin.x = x;     self.frame = frame; }   - (void)setY:(CGFloat)y {     CGRect frame = self.frame;     frame.origin.y = y;     self.frame = frame; }   - (CGFloat)x {     returnself.frame.origin.x; }   - (CGFloat)y {     returnself.frame.origin.y; }   - (void)setCenterX:(CGFloat)centerX {     CGPoint center = self.center;     center.x = centerX;     self.center = center; }   - (CGFloat)centerX {     returnself.center.x; }   - (void)setCenterY:(CGFloat)centerY {     CGPoint center = self.center;     center.y = centerY;     self.center = center; }   - (CGFloat)centerY {     returnself.center.y; }   - (void)setWidth:(CGFloat)width {     CGRect frame = self.frame;     frame.size.width = width;     self.frame = frame; }   - (void)setHeight:(CGFloat)height {     CGRect frame = self.frame;     frame.size.height = height;     self.frame = frame; }   - (CGFloat)height {     returnself.frame.size.height; }   - (CGFloat)width {     returnself.frame.size.width; }   - (void)setSize:(CGSize)size {     CGRect frame = self.frame;     frame.size = size;     self.frame = frame; }   - (CGSize)size {     returnself.frame.size; }   - (void)setOrigin:(CGPoint)origin {     CGRect frame = self.frame;     frame.origin = origin;     self.frame = frame; }   - (CGPoint)origin {     returnself.frame.origin; } @end

有需要的朋友可以直接用

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