iOS小记－－键盘位移

1.监听键盘弹起

- (void)registerForKeyboardNotifications

{

//使用NSNotificationCenter 鍵盤出現時

[[NSNotificationCenter defaultCenter] addObserver:self

selector:@selector(keyboardWasShown:)

name:UIKeyboardDidShowNotification object:nil];

}

2.实现当键盘出现的时候计算键盘的高度大小。用于输入框显示位置

- (void)keyboardWasShown:(NSNotification*)aNotification

{

NSDictionary* info = [aNotification userInfo];

//kbSize即為鍵盤尺寸 (有width, height)

CGSize kbSize = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;//得到鍵盤的高度

NSLog(@"hight_hitht:%f",kbSize.height);

_keyboardhight = SCREEN_HEIGHT - kbSize.height;

//输入框位置动画加载

[self begainMoveUpAnimation:_keyboardhight];

}

- (void)begainMoveUpAnimation:(CGFloat)hight

{

UITextField *tx = (UITextField *)[[self view] viewWithTag:_editingTag];

if ((tx.frame.origin.y+tx.bounds.size.height+10) > hight) {

[UIView animateWithDuration:0.5 animations:^{

[[self view] setFrame:CGRectMake(0, (hight - (tx.frame.origin.y+tx.bounds.size.height+10)), SCREEN_WIDTH, SCREEN_HEIGHT)];

}

completion:^(BOOL finished){

}];

}