文本字段被键盘隐藏[重复]

Question

我制作了一个带有注册表单的应用程序。选择此表单中的文本字段时，它会被软键盘隐藏。如果我保持原样，用户在输入时看不到他输入的内容。

Answer 1

这是旧方法，但每次都能正常工作

在你的 .h 文件中

@interface signupViewController : UIViewController
{
CGFloat animatedDistance;
 }

.m 文件

static const CGFloat KEYBOARD_ANIMATION_DURATION = 0.3;
static const CGFloat MINIMUM_SCROLL_FRACTION = 0.2;
static const CGFloat MAXIMUM_SCROLL_FRACTION = 0.8;
static const CGFloat PORTRAIT_KEYBOARD_HEIGHT = 216;


-(void)textFieldDidBeginEditing:(UITextField *)textField
{
CGRect textFieldRect =
[self.view.window convertRect:textField.bounds fromView:textField];
CGRect viewRect =
[self.view.window convertRect:self.view.bounds fromView:self.view];

CGFloat midline = textFieldRect.origin.y + 0.5 * textFieldRect.size.height;
CGFloat numerator =
midline - viewRect.origin.y
- MINIMUM_SCROLL_FRACTION * viewRect.size.height;
CGFloat denominator =
(MAXIMUM_SCROLL_FRACTION - MINIMUM_SCROLL_FRACTION)
* viewRect.size.height;
CGFloat heightFraction = numerator / denominator;
if (heightFraction < 0.0)
{
    heightFraction = 0.0;
}
else if (heightFraction > 1.0)
{
    heightFraction = 1.0;
}


animatedDistance = floor(PORTRAIT_KEYBOARD_HEIGHT * heightFraction);

CGRect viewFrame = self.view.frame;
viewFrame.origin.y -= animatedDistance;

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];

[self.view setFrame:viewFrame];

[UIView commitAnimations];
}


- (void)textFieldDidEndEditing:(UITextField *)textField

{
CGRect viewFrame = self.view.frame;
viewFrame.origin.y += animatedDistance;

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];

[self.view setFrame:viewFrame];

[UIView commitAnimations];

}

Answer 2

试试这个可能会有帮助..

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

- (void)textFieldDidEndEditing:(UITextField *)textField{
    [self animateTextField:textField up:NO];}

-(void)animateTextField:(UITextField*)textField up:(BOOL)up
{
    int movementDistance = -100; // tweak as needed
    float movementDuration = 0.3f; // tweak as needed
    int movement = (up ? movementDistance : -movementDistance);
    [UIView beginAnimations: @"animateTextField" context: nil];
    [UIView setAnimationBeginsFromCurrentState: YES];
    [UIView setAnimationDuration: movementDuration];
    self.view.frame = CGRectOffset(self.view.frame, 0, movement);
    [UIView commitAnimations];
}