Question

我在ipad上有一个表单，最后有很多文本字段和一个按钮。键盘处于活动状态时会有一些字段位于键盘下方。为了使键盘后面隐藏的texfield可见，我使用以下代码。

- (void)textFieldDidBeginEditing:(UITextField *)textField
{
[self animateTextField:textField up:YES];
}

- (void)textFieldDidEndEditing:(UITextField *)textField
{
_scrollView.frame=CGRectMake(0, 0, 1024, 655);
[self animateTextField:textField up:NO];
}

- (void) animateTextField: (UITextField*) textField up: (BOOL) up
{
CGPoint temp = [textField.superview convertPoint:textField.frame.origin toView:nil];
UIInterfaceOrientation orientation =
[[UIApplication sharedApplication] statusBarOrientation];
if (orientation == UIInterfaceOrientationPortrait)
{
    // NSLog(@"portrait");
    if(up)
    {
        int moveUpValue = temp.y+textField.frame.size.height;
        animatedDis = 264-(1024-moveUpValue-5);
    }
}
else if(orientation == UIInterfaceOrientationPortraitUpsideDown)
{
    if(up)
    {
        int moveUpValue = 1004-temp.y+textField.frame.size.height;
        animatedDis = 264-(1004-moveUpValue-5);
    }
}
else if(orientation == UIInterfaceOrientationLandscapeLeft)
{
    if(up)
    {
        int moveUpValue = temp.x+textField.frame.size.height;
        animatedDis = 352-(768-moveUpValue-5);
    }
}
else
{
    if(up)
    {
        int moveUpValue = 768-temp.x+textField.frame.size.height;
        animatedDis = 352-(768-moveUpValue-5);
        _scrollView.frame = CGRectMake(0, 0, 1024, 655-240);
    }

}
if(animatedDis>0)
{
    const int movementDistance = animatedDis;
    const float movementDuration = 0.3f;
    int movement = (up ? -movementDistance : movementDistance);
    [UIView beginAnimations: nil context: nil];
    [UIView setAnimationBeginsFromCurrentState: YES];
    [UIView setAnimationDuration: movementDuration];
    if (orientation == UIInterfaceOrientationPortrait)
    {
        self.view.frame = CGRectOffset(self.view.frame, 0, movement);
    }
    else if(orientation == UIInterfaceOrientationPortraitUpsideDown)
    {
        self.view.frame = CGRectOffset(self.view.frame, 0, movement);
    }
    else if(orientation == UIInterfaceOrientationLandscapeLeft)
    {
        self.view.frame = CGRectOffset(self.view.frame, 0, movement);
    }
    else
    {
        self.view.frame = CGRectOffset(self.view.frame, 0, movement);
    }
    [UIView commitAnimations];
}
}

我也在使用滚动视图。我的问题是，当键盘处于活动状态并按下我的按钮时，它会转到下一个屏幕。现在，如果我向后导航，键盘处于活动状态并且先前的动画已设置。现在如果我隐藏键盘，整个视图向下滚动，在顶部留下黑色部分。如何处理这种情况？

Answer 1

好。经过大量研究，我发现了一种简单的方法这是通知的使用。在我的viewDidLoad中，我添加了这两个键盘通知。

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasShown:) name: UIKeyboardDidShowNotification object:nil];

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

这是两种选择方法：

-(void)keyboardWasShown:(NSNotification *)aNotification
{

if (displayKeyboard==YES) {
    return;
}
NSDictionary* info = [aNotification userInfo];
NSValue* aValue = [info objectForKey:UIKeyboardBoundsUserInfoKey];
//NSValue* aValue = [info objectForKey:UIKeyboardFrameBeginUserInfoKey];
CGSize keyboardSize = [aValue CGRectValue].size;

NSLog(@"kbw====%fkbh====%f",keyboardSize.width,keyboardSize.height);

offset = _scrollView.contentOffset;

CGRect viewFrame = _scrollView.frame;

NSLog(@"svw====%fsvh===%f",viewFrame.size.width,viewFrame.size.height);
viewFrame.size.height -= keyboardSize.height-49;
NSLog(@"new view hgt =====%f",viewFrame.size.height);
_scrollView.frame = viewFrame;

CGRect textFieldRect = [activeField frame];
textFieldRect.origin.y += 10;
[_scrollView scrollRectToVisible: textFieldRect animated:YES];
displayKeyboard = YES;
}
-(void)keyboardWillBeHidden:(NSNotification *)aNotification
{

if (!displayKeyboard) {
    return; 
}

_scrollView.frame = CGRectMake(0, 0, 1024, 655);
_scrollView.contentOffset =offset;
displayKeyboard = NO;
}

-(BOOL) textFieldShouldBeginEditing:(UITextField*)textField {
activeField = textField;
return YES;
}

displayKeyboard，offset和activeField在.h文件中声明。

另请注意删除viewDidDisappear中的通知：动画

虽然这种方法与前面提到的方法完全不同，但当ui键盘处于活动状态时，这种方法在类之间导航时不会在顶部留下黑色部分。

另外我注意到的是，如果我使用已弃用的UIKeyboardBoundsUserInfoKey我习惯于获得正确的键盘宽度和高度（我只在横向模式下工作）。而当我使用UIKeyboardFrameBeginUserInfoKey时，宽度和高度值互换。我仍在试图找出这个问题。

此外，当键盘出现时，49px的固定空间被附加到其上方。我认为那是我的tabbar高度，因此减去了49.

uikeyboard在导航上留下黑色部分

1 个答案: