Question

我在iPhone上有一个应用程序，它在viewcontroller中有很多内容。一般来说主要内容是形式。我的问题是我设置了键盘，并希望键入一些值来形成字段很多内容是不可见的。我想在键盘出现时滚动此内容。我怎样才能做到这一点？我的观点确实没有滚动视图，但是我试过这样做，但它不起作用。

到目前为止，我发现的所有提示都涉及如何使用文本框，但这不是我的假设。

Answer 1

这就是我所做的，当键盘像这样上下移动时我改变了顶部约束 -

viewDidLoad中的

调用此方法 -

   [self observeKeyboard];
#pragma mark- Keyboard Listen Methods
- (void)observeKeyboard {
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillChangeFrameNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}


- (void)keyboardWillShow:(NSNotification *)notification {
NSDictionary *info = [notification userInfo];
NSValue *kbFrame = [info objectForKey:UIKeyboardFrameEndUserInfoKey];
NSTimeInterval animationDuration = [[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
CGRect keyboardFrame = [kbFrame CGRectValue];
CGFloat height = keyboardFrame.size.height;
self.COnstraintTopViewVertical.constant=(value of constant)-height;
[UIView animateWithDuration:animationDuration animations:^{
    [self.view layoutIfNeeded];
}];
}

- (void)keyboardWillHide:(NSNotification *)notification {
NSDictionary *info = [notification userInfo];
NSTimeInterval animationDuration = [[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
self.ConstraintTopViewVertical.constant=reset value;
[UIView animateWithDuration:animationDuration animations:^{
    [self.view layoutIfNeeded];
}];
}

Answer 2

您可以使用以下代码以编程方式更改键盘外观视图中的位置：

func keyboardWasShown(notification: NSNotification) {

    UIView.animateWithDuration(0.3, animations: { () -> Void in
        self.setContentOffset(CGPoint(x: setXOffsetHere, y: setYOffsetHere), animated: true)
    })
}

此代码将视图转换为键盘外观后在.setContentOffset调用中指定的坐标。你仍然需要得到坐标，但通常它们很容易从故事板中获得。

Answer 3

将所有观看次数放在滚动视图中
设置从滚动视图底部到超级视图底部的自动布局约束

在viewWillAppear

中

[[NSNotificationCenter defaultCenter] addObserver:self
                                     selector:@selector(keyboardWillChangeFrame:)
                                         name:UIKeyboardWillChangeFrameNotification object:nil];

处理KB通知

- (void)keyboardWillChangeFrame:(NSNotification*)aNotification
{
    CGRect kbFrame = [aNotification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
    CGRect kbWindowIntersectionFrame = CGRectIntersection(self.view.window.bounds, kbFrame);

    [UIView animateWithDuration:[aNotification.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue] animations:^{
        self.scrollVBottomConstraint.constant = kbWindowIntersectionFrame.size.height;
        [self.view layoutIfNeeded];
    }];
}

Answer 4

what i got from your question is: you are using textfield on UIView which is not on the scrollview, now you have to scroll the UIView when keyboard appears. just do following stuff.
-Give the tag to your textfield.
-suppose tag you have given is 4545646
-do not forgot to assign delegate to your textfield (it will execute below delegate method when you start to edit)
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    if (textField.tag == 4545646) {
        UIView *contanerView = [self.view viewWithTag:5556466];
        [UIView animateWithDuration:0.5 animations:^{
            contanerView.frame = CGRectMake(self.view.frame.origin.x+1, -85, self.view.frame.size.width, self.view.frame.size.height-9);
        }];
    }
}
Change the frame as per your requirement.
and 
- (void)textFieldDidEndEditing:(UITextField *)textField {
    if (textField.tag == 4545646) {
        [textField resignFirstResponder];
        UIView *contanerView = [self.view viewWithTag:5556466];
        [UIView animateWithDuration:0.5 animations:^{
            contanerView.frame = CGRectMake(self.view.frame.origin.x+1, self.view.frame.origin.y, self.view.frame.size.width, self.view.frame.size.height);
        }];
}

Answer 5

在viewDidAppear中添加以下通知

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyBoardShown:) name:UIKeyboardWillShowNotification object:nil];

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

并在keyBoardShown方法中获取键盘高度

 - (void)keyBoardShown:(NSNotification*)notification
{
    if(self.view.frame.origin.y>=0)
    {
        NSDictionary* keyboardInfo = [notification userInfo];
        NSValue* keyboardFrameBegin = [keyboardInfo valueForKey:UIKeyboardFrameBeginUserInfoKey];
        CGRect keyboardFrameBeginRect = [keyboardFrameBegin CGRectValue];

        //    NSLog(@"hihi : %f",keyboardFrameBeginRect.size.height);

        keyBoardHeight = keyboardFrameBeginRect.size.height-yDeault+50;


        if (keyBoardHeight>0) {
            [UIView beginAnimations:nil context:nil];
            [UIView setAnimationDuration:0.5];

            [UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
            self.view.frame = CGRectMake(self.view.frame.origin.x, (self.view.frame.origin.y-keyBoardHeight), self.view.frame.size.width, self.view.frame.size.height);
            [UIView commitAnimations];
        }


    }
}

keyBoardDismiss中的

将主视图y坐标设置为先前值

-(void)keyBoardDismiss:(NSNotification*)notification{
    if(self.view.frame.origin.y<0){
        [UIView beginAnimations:nil context:nil];
        [UIView setAnimationDuration:0.5];

        [UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
        self.view.frame = CGRectMake(self.view.frame.origin.x, (self.view.frame.origin.y+keyBoardHeight), self.view.frame.size.width, self.view.frame.size.height);
        [UIView commitAnimations];
    }
}

这里yDeault是文本字段y坐标值

 yDeault= screenHeight-textField.frame.origin.y+textField.frame.size.height;

一旦键盘显示，主视图将向上移动，一旦键盘被解除，主视图将被移回原位

Answer 6

行。我这样做了我需要添加滚动视图，但在我的应用程序中，我可能需要重建所有视图。

Answer 7

无需添加scrollview。你可以直接做到这一点。您可以更改self.view.frame，而无需使用scrollview。

当键盘出现在iOS中时启用滚动内容

7 个答案: