当我们点击文本字段时，我使用以下代码向上移动屏幕，此代码与xcode 3一起工作正常，但它不能与xcode 4一起使用，它没有给出任何错误但是当我们触摸文本时现场屏幕病态向上移动到更高的高度，有时候不会回到原来的位置
- (void)keyboardWasShown:(NSNotification *)aNotification {
if ( keyboardShown )
return;
if ((activeField==tfText[4])||(activeField==tfText[5]))
{
#if __IPHONE_OS_VERSION_MIN_REQUIRED <= __IPHONE_3_2
CGRect _keyboardEndFrame;
[[aNotification.userInfo valueForKey:UIKeyboardBoundsUserInfoKey] getValue:&_keyboardEndFrame];
CGFloat keyboardSize;
if ([[UIDevice currentDevice] orientation] == UIDeviceOrientationPortrait || [[UIDevice currentDevice] orientation] == UIDeviceOrientationPortraitUpsideDown)
{
keyboardSize = _keyboardEndFrame.size.height;
}
else {
keyboardSize = _keyboardEndFrame.size.width;
}
NSTimeInterval animationDuration = 0.300000011920929;
CGRect frame = self.view.frame;
frame.origin.y -= keyboardSize-70;
frame.size.height += keyboardSize-70;
[UIView beginAnimations:@"ResizeForKeyboard" context:nil];
[UIView setAnimationDuration:animationDuration];
self.view.frame = frame;
[UIView commitAnimations];
#else
NSDictionary *info = [aNotification userInfo];
NSValue *aValue = [info objectForKey:UIKeyboardBoundsUserInfoKey];
CGSize keyboardSize = [aValue CGRectValue].size;
NSTimeInterval animationDuration = 0.300000011920929;
CGRect frame = self.view.frame;
frame.origin.y -= keyboardSize.height-70;
frame.size.height += keyboardSize.height-70;
[UIView beginAnimations:@"ResizeForKeyboard" context:nil];
[UIView setAnimationDuration:animationDuration];
self.view.frame = frame;
[UIView commitAnimations];
#endif
viewMoved = YES;
}
keyboardShown = YES;
}
- (void)keyboardWasHidden:(NSNotification *)aNotification {
if ( viewMoved ) {
#if __IPHONE_OS_VERSION_MIN_REQUIRED <= __IPHONE_3_2
CGRect _keyboardEndFrame;
[[aNotification.userInfo valueForKey:UIKeyboardBoundsUserInfoKey] getValue:&_keyboardEndFrame];
CGFloat keyboardSize;
if ([[UIDevice currentDevice] orientation] == UIDeviceOrientationPortrait || [[UIDevice currentDevice] orientation] == UIDeviceOrientationPortraitUpsideDown) {
keyboardSize = _keyboardEndFrame.size.height;
}
else {
keyboardSize = _keyboardEndFrame.size.width;
}
NSTimeInterval animationDuration = 0.300000011920929;
CGRect frame = self.view.frame;
frame.origin.y += keyboardSize-70;
frame.size.height -= keyboardSize-70;
[UIView beginAnimations:@"ResizeForKeyboard" context:nil];
[UIView setAnimationDuration:animationDuration];
self.view.frame = frame;
[UIView commitAnimations];
#else
NSValue *aValue = [info objectForKey:UIKeyboardBoundsUserInfoKey];
CGSize keyboardSize = [aValue CGRectValue].size;
NSTimeInterval animationDuration = 0.300000011920929;
CGRect frame = self.view.frame;
frame.origin.y += keyboardSize.height-70;
frame.size.height -= keyboardSize.height-70;
[UIView beginAnimations:@"ResizeForKeyboard" context:nil];
[UIView setAnimationDuration:animationDuration];
self.view.frame = frame;
[UIView commitAnimations];
#endif
viewMoved = NO;
}
keyboardShown = NO;
}
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
activeField = textField;
}
- (void)textFieldDidEndEditing:(UITextField *)textField
{
activeField = nil;
// Additional Code
}
使用以下代码我调用上述方法
- (void)viewDidLoad
{
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWasShown:)
name:UIKeyboardDidShowNotification
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWasHidden:)
name:UIKeyboardDidHideNotification
object:nil];
}
答案 0 :(得分：1)
- (void)viewDidLoad
{
[super viewDidLoad];
// register for keyboard notifications
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillShow:)
name:UIKeyboardWillShowNotification
object:self.view.window];
// register for keyboard notifications
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillHide:)
name:UIKeyboardWillHideNotification
object:self.view.window];
keyboardIsShown = NO;
//make contentSize bigger than your scrollSize (you will need to figure out for your own use case)
CGSize scrollContentSize = CGSizeMake(320, 345);
self.scrollView.contentSize = scrollContentSize;
}
- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
// unregister for keyboard notifications while not visible.
[[NSNotificationCenter defaultCenter] removeObserver:self
name:UIKeyboardWillShowNotification
object:nil];
// unregister for keyboard notifications while not visible.
[[NSNotificationCenter defaultCenter] removeObserver:self
name:UIKeyboardWillHideNotification
object:nil];
}
- (void)keyboardWillHide:(NSNotification *)n
{
NSDictionary* userInfo = [n userInfo];
// get the size of the keyboard
NSValue* boundsValue = [userInfo objectForKey:UIKeyboardBoundsUserInfoKey];
CGSize keyboardSize = [boundsValue CGRectValue].size;
// resize the scrollview
CGRect viewFrame = self.scrollView.frame;
// I'm also subtracting a constant kTabBarHeight because my UIScrollView was offset by the UITabBar so really only the portion of the keyboard that is leftover pass the UITabBar is obscuring my UIScrollView.
viewFrame.size.height += (keyboardSize.height - kTabBarHeight);
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
// The kKeyboardAnimationDuration I am using is 0.3
[UIView setAnimationDuration:kKeyboardAnimationDuration];
[self.scrollView setFrame:viewFrame];
[UIView commitAnimations];
keyboardIsShown = NO;
}
- (void)keyboardWillShow:(NSNotification *)n
{
// This is an ivar I'm using to ensure that we do not do the frame size adjustment on the UIScrollView if the keyboard is already shown. This can happen if the user, after fixing editing a UITextField, scrolls the resized UIScrollView to another UITextField and attempts to edit the next UITextField. If we were to resize the UIScrollView again, it would be disastrous. NOTE: The keyboard notification will fire even when the keyboard is already shown.
if (keyboardIsShown) {
return;
}
NSDictionary* userInfo = [n userInfo];
// get the size of the keyboard
NSValue* boundsValue = [userInfo objectForKey:UIKeyboardBoundsUserInfoKey];
CGSize keyboardSize = [boundsValue CGRectValue].size;
// resize the noteView
CGRect viewFrame = self.scrollView.frame;
// I'm also subtracting a constant kTabBarHeight because my UIScrollView was offset by the UITabBar so really only the portion of the keyboard that is leftover pass the UITabBar is obscuring my UIScrollView.
viewFrame.size.height -= (keyboardSize.height - kTabBarHeight);
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
// The kKeyboardAnimationDuration I am using is 0.3
[UIView setAnimationDuration:kKeyboardAnimationDuration];
[self.scrollView setFrame:viewFrame];
[UIView commitAnimations];
keyboardIsShown = YES;
}