Question

在我的应用中，表格很少。有时键盘隐藏字段，因此用户无法看到他键入的内容。在这种情况下，我找到了移动视图或滚动查看的方法，因此文本字段保持在键盘上方。问题是在iPhone 5上我需要为最后3个文本字段移动视图，但对于iPhone 6 - 仅用于最后一个文本字段。

我可以定义所有字段和设备屏幕高度值的情况。但是我想找到更优雅的解决方案来检测当前设备上的键盘下面的texfield是否需要移动视图？

Answer 1

使用TPKeyboardAvoidingScrollView。它易于使用

将TPKeyboardAvoidingScrollView.m和TPKeyboardAvoidingScrollView.h源文件放入项目中，将UIScrollView弹出到视图控制器的xib中，将滚动视图的类设置为TPKeyboardAvoidingScrollView，并将所有控件放在该滚动视图中。您也可以在不使用xib的情况下以编程方式创建它 - 只需使用TPKeyboardAvoidingScrollView作为顶级视图。

Answer 2

Apple here

提供了很好的帮助指南

您需要收听

等键盘通知

// Call this method somewhere in your view controller setup code.
- (void)registerForKeyboardNotifications
{
    [[NSNotificationCenter defaultCenter] addObserver:self
            selector:@selector(keyboardWasShown:)
            name:UIKeyboardDidShowNotification object:nil];

   [[NSNotificationCenter defaultCenter] addObserver:self
             selector:@selector(keyboardWillBeHidden:)
             name:UIKeyboardWillHideNotification object:nil];

}

// Called when the UIKeyboardDidShowNotification is sent.
- (void)keyboardWasShown:(NSNotification*)aNotification
{
    NSDictionary* info = [aNotification userInfo];
    CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;

    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height, 0.0);
    scrollView.contentInset = contentInsets;
    scrollView.scrollIndicatorInsets = contentInsets;

    // If active text field is hidden by keyboard, scroll it so it's visible
    // Your app might not need or want this behavior.
    CGRect aRect = self.view.frame;
    aRect.size.height -= kbSize.height;
    if (!CGRectContainsPoint(aRect, activeField.frame.origin) ) {
        [self.scrollView scrollRectToVisible:activeField.frame animated:YES];
    }
}

// Called when the UIKeyboardWillHideNotification is sent
- (void)keyboardWillBeHidden:(NSNotification*)aNotification
{
    UIEdgeInsets contentInsets = UIEdgeInsetsZero;
    scrollView.contentInset = contentInsets;
    scrollView.scrollIndicatorInsets = contentInsets;
}

Answer 3

您可以使用其委托方法UITextField来检测哪个- (void)textFieldDidBeginEditing:(UITextField *)textField是“有效”。

使用textField.frame计算您需要为scrollView.contentOffset设置的偏移量。在- textFieldDidBeginEditing:方法中，您可以重置contentOffset = CGPointZero

键盘下的文字字段

3 个答案: