键盘事件

在整理以前项目时，对之前对键盘处理不是很满意，今天特意重新写了一个。

- (void)becomeObserver {
    NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter];
    // 键盘通知
    [notificationCenter addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
    [notificationCenter addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    [notificationCenter addObserver:self selector:@selector(keyboardChangeFrame:) name:UIKeyboardWillChangeFrameNotification object:nil];

}

#pragma mark - keyboard Notification

/**键盘隐藏*/
- (void)keyboardWillHide:(NSNotification *)notification {

    self.showsKeyboard = NO;

    if (!self.showsExtraboard && !self.showsEmojiboard) {
        CGFloat fallingHeight = keyboardHeight;

        for (UIView *v in self.rootView.subviews) {
            if (![v isEqual:self.rootView.chatNavigationBar] && ![v isEqual:self.rootView.chatTableView]) {
                CGRect frame = v.frame;
                frame.origin.y += fallingHeight;
                [UIView animateWithDuration:boardDuration animations:^{
                    v.frame = frame;
                }];
            }

            if ([v isEqual:self.rootView.chatTableView]) {
                CGRect frame = v.frame;
                frame.size.height += fallingHeight;
                [UIView animateWithDuration:boardDuration animations:^{
                    v.frame = frame;
                }];
            }
        }
    }
}

/**键盘显示*/
- (void)keyboardWillShow:(NSNotification *)notification {

    NSTimeInterval duration = [[[notification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];
    CGRect begin = [[[notification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue];
    CGRect end = [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];

    if (duration == 0) {
        duration = 0.25;
    }

    if (!self.showsKeyboard) {

        // 第三方键盘三次回调，仅执行左后一次(仅以搜狗输入法作的测试)
        if (begin.size.height > 0 && begin.origin.y - end.origin.y > 0) {

            keyboardHeight = end.size.height;

            CGFloat liftingHeight = keyboardHeight;
            if (self.showsExtraboard | self.showsEmojiboard) {
                liftingHeight = liftingHeight > BOARD_HEIGHT ? liftingHeight - BOARD_HEIGHT : BOARD_HEIGHT - liftingHeight;
            }

            for (UIView *v in self.rootView.subviews) {
                if (![v isEqual:self.rootView.chatNavigationBar] && ![v isEqual:self.rootView.chatTableView]) {
                    CGRect frame = v.frame;

                    frame.origin.y -= liftingHeight;
                    [UIView animateWithDuration:boardDuration - 0.08 animations:^{
                        v.frame = frame;
                    }];
                }

                if ([v isEqual:self.rootView.chatTableView]) {
                    CGRect frame = v.frame;
                    frame.size.height -= liftingHeight;
                    [UIView animateWithDuration:boardDuration - 0.08 animations:^{
                        v.frame = frame;
                    }];
                }
            }

            self.showsKeyboard = YES;
            self.showsEmojiboard = NO;
            self.showsExtraboard = NO;
        }
    }

}

/**在使用过程中切换键盘*/
- (void)keyboardChangeFrame:(NSNotification *)notification {
    if (self.showsKeyboard) {
        CGRect begin = [[[notification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue];
        CGRect end = [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];

        // 在ip6s中使用搜狗输入法和系统键盘切换时发现
        // sougou --> sys : 282 -> 258
        // sys --> sougou : 258 -> 0 -> 216 -> 282 也就是说系统键盘先下去隐藏，再弹出搜狗，在弹出搜狗的过程中在216处有回调

        CGFloat offset = end.size.height - begin.size.height;
        keyboardHeight = end.size.height;
        for (UIView *v in self.rootView.subviews) {
            if (![v isEqual:self.rootView.chatNavigationBar] && ![v isEqual:self.rootView.chatTableView]) {
                CGRect frame = v.frame;

                frame.origin.y -= offset;
                [UIView animateWithDuration:0.1 animations:^{
                    v.frame = frame;
                }];
            }

            if ([v isEqual:self.rootView.chatTableView]) {
                CGRect frame = v.frame;
                frame.size.height -= offset;
                [UIView animateWithDuration:0.1 animations:^{
                    v.frame = frame;
                }];
            }
        }


    }
}