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[英]Obj-C: How can I use my retrieved keyboard height inside of animateTextView?
[英]Obj-c - Wrong keyboard height is returned?
我正在嘗試獲取iOS鍵盤的高度,以便在為鍵盤設置動畫時可以向上移動視圖。 但是,我不斷獲得返回的值258(這是不正確的,因為它將我的視圖推得太高了?)為什么會發生這種情況? 代碼如下:
ViewController.m
-(void)viewDidLoad {
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChange:) name:UIKeyboardWillChangeFrameNotification object:nil];
}
- (void)keyboardWillChange:(NSNotification *)notification {
NSDictionary* keyboardInfo = [notification userInfo];
NSValue* keyboardFrameBegin = [keyboardInfo valueForKey:UIKeyboardFrameEndUserInfoKey];
CGRect keyboardFrameBeginRect = [keyboardFrameBegin CGRectValue];
self.keyboardHeight = keyboardFrameBeginRect.size.height;
}
- (void) animateTextView:(BOOL) up
{
const int movementDistance = self.keyboardHeight;
const float movementDuration = 0.3f;
int movement= movement = (up ? -movementDistance : movementDistance);
[UIView beginAnimations: @"anim" context: nil];
[UIView setAnimationBeginsFromCurrentState: YES];
[UIView setAnimationDuration: movementDuration];
self.upView.frame = CGRectOffset(self.upView.frame, 0, movement);
[UIView setAnimationDidStopSelector:@selector(afterAnimationStops)];
[UIView commitAnimations];
}
要獲得鍵盤的高度,應使用UIKeyboardWillShowNotification
或UIKeyboardDidShowNotification
代替UIKeyboardWillChangeFrameNotification.
-(void)viewDidLoad {
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChange:) name:UIKeyboardWillShowNotification object:nil];
}
如果使用UITabBarController
,則必須計算不帶標簽欄高度的框架。 您可以使用以下代碼獲取標簽欄的高度。
self.tabBarController.tabBar.frame.height
您應該注冊UIKeyboardWillShowNotification以便觀察鍵盤高度。
1) [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChange:) name:UIKeyboardWillShowNotification object:nil];
2)您也可以嘗試以下代碼:
(void)keyboardWillChange:(NSNotification *)notification
{
NSDictionary* keyboardInfo = [notification userInfo];
NSValue* keyboardFrameBegin = [keyboardInfo valueForKey:UIKeyboardFrameBeginUserInfoKey];
CGRect keyboardFrameBeginRect = [keyboardFrameBegin CGRectValue];
}
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