iOS 老生常談的鍵盤遮擋問題

 一、如果在tableview內，可以採用tableview偏移來解決：

– (void)textFieldDidBeginEditing:(UITextField *)textField{

    if ([textField isEqual:XXXX]) {

        CGPoint origin = textField.frame.origin;

        CGPoint point = [textField.superview convertPoint:origin toView:self.tableView];

        float navBarHeight = self.navigationController.navigationBar.frame.size.height;

        CGPoint offset = self.tableView.contentOffset;

        // change offsetY

        offset.y = (point.y – 216 – navBarHeight-40);//216固定鍵盤高度，雖然不精准但勉強可以用

        [self.tableView setContentOffset:offset animated:YES];

    }

}

二、比較通用的遮擋處理，利用內置UIKeyboard通知

    NSNotificationCenter *center = [NSNotificationCenter defaultCenter];

    [center addObserver:self selector:@selector(keyboardWillShow:)  name:UIKeyboardWillShowNotification  object:nil];//鍵盤彈出

    [center addObserver:self selector:@selector(keyboardDidHide)  name:UIKeyboardWillHideNotification object:nil]; //鍵盤收起

– (void)keyboardWillShow:(NSNotification *)aNotification{

    NSDictionary *userInfo = [aNotification userInfo];

    NSValue *aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];

    CGRect keyboardRect = [aValue CGRectValue];

    CGFloat _keyboardHeight = ([[UIDevice currentDevice] orientation] == UIDeviceOrientationPortrait || [[UIDevice currentDevice] orientation] == UIDeviceOrientationPortraitUpsideDown) ? keyboardRect.size.height : keyboardRect.size.width;//獲取到鍵盤高度

    //接下來想怎麼做都可以，改變ViewOffset、Frame等等   然後在keyboardHide事件中還原就可以
//示例：

    [UIView animateWithDuration:duration animations:^{

        self.view.frame = CGRectMake(0.0f, -1 * _keyboardHeight, self.view.frame.size.width, self.view.frame.size.height);

    }];

}