最近做的項目中，有一個類似微博中的評論轉發功能，屏幕底端有一個輸入框用textView來做，當textView成為第一響應者的時候它的Y值隨著鍵盤高度的改變而改變，保證textView緊貼著鍵盤，但又不會被鍵盤擋住。

下面是我實現的方法：（利用通知）

1 2 3 4 5 6 7 8 9 10 11 12 // 鍵盤通知     // 鍵盤的frame發生改變時發出的通知（位置和尺寸）     //    UIKeyboardWillChangeFrameNotification     //    UIKeyboardDidChangeFrameNotification     // 鍵盤顯示時發出的通知     //    UIKeyboardWillShowNotification     //    UIKeyboardDidShowNotification     // 鍵盤隱藏時發出的通知     //    UIKeyboardWillHideNotification     //    UIKeyboardDidHideNotification          [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChangeFrame:) name:UIKeyboardWillChangeFrameNotification object:nil];//在這裡注冊通知

下面是監聽通知：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 #pragma mark - 監聽方法 /**  * 鍵盤的frame發生改變時調用（顯示、隱藏等）  */ - (void)keyboardWillChangeFrame:(NSNotification *)notification {     //    if (self.picking) return;     /**      notification.userInfo = @{      // 鍵盤彈出隱藏後的frame      UIKeyboardFrameEndUserInfoKey = NSRect: {{0, 352}, {320, 216}},      // 鍵盤彈出隱藏所耗費的時間      UIKeyboardAnimationDurationUserInfoKey = 0.25,      // 鍵盤彈出隱藏動畫的執行節奏（先快後慢，勻速）      UIKeyboardAnimationCurveUserInfoKey = 7      }      */          NSDictionary *userInfo = notification.userInfo;          // 動畫的持續時間     double duration = [userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];          // 鍵盤的frame     CGRect keyboardF = [userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];          // 執行動畫     [UIView animateWithDuration:duration animations:^{         // 工具條的Y值 == 鍵盤的Y值 - 工具條的高度         if (keyboardF.origin.y > self.view.height) { // 鍵盤的Y值已經遠遠超過了控制器view的高度             self.toolbar.y = self.view.height - self.toolbar.height;//這裡的<span >self.toolbar就是我的輸入框。</span>         } else {             self.toolbar.y = keyboardF.origin.y - self.toolbar.height;         }     }]; }

當然，這裡我為UIView寫了一個類別，實現如下：.h文件中聲明

1 2 3 4 5 6 7 8 9 10 @interface UIView (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文件中實現（重寫setter 和 getter）

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 @implementation UIView (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 {     return self.frame.origin.x; } - (CGFloat)y {     return self.frame.origin.y; } - (void)setCenterX:(CGFloat)centerX {     CGPoint center = self.center;     center.x = centerX;     self.center = center; } - (CGFloat)centerX {     return self.center.x; } - (void)setCenterY:(CGFloat)centerY {     CGPoint center = self.center;     center.y = centerY;     self.center = center; } - (CGFloat)centerY {     return self.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 {     return self.frame.size.height; } - (CGFloat)width {     return self.frame.size.width; } - (void)setSize:(CGSize)size {     CGRect frame = self.frame;     frame.size = size;     self.frame = frame; } - (CGSize)size {     return self.frame.size; } - (void)setOrigin:(CGPoint)origin {     CGRect frame = self.frame;     frame.origin = origin;     self.frame = frame; } - (CGPoint)origin {     return self.frame.origin; } @end

有需要的朋友可以直接用