iphone：在视图中滚动

Question

我想问一个基本的iPhone问题。我在iPhone视图中有很多TextField，当我点击在TextField中输入时，键盘显示并隐藏其他TextField。我想使父视图可滚动。你能给我看一下示例代码吗？

非常感谢您

Answer 1

您可以听取键盘上下通知。并将您的视图移动到键盘高度的上方。

在ViewWillAppear方法：

NSNotificationCenter *nc = [NSNotificationCenter defaultCenter]; 
[nc addObserver:self selector:@selector(keyboardWillShow:) name: UIKeyboardWillShowNotification object:nil]; 
[nc addObserver:self selector:@selector(keyboardWillHide:) name: UIKeyboardWillHideNotification object:nil]; 

在ViewWillDisAppear方法：

[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil]; 
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil]; 

，然后有方法上面提到调整杆的位置：

-(void) keyboardWillShow:(NSNotification *) note 
{ 
    CGRect r = bar.frame, t; 
    [[note.userInfo valueForKey:UIKeyboardBoundsUserInfoKey] getValue: &t]; 
    r.origin.y -= t.size.height; 
    bar.frame = r; 
} 




-(void) keyboardWillHide:(NSNotification *) note 
    { 
     CGRect r = bar.frame, t; 
     [[note.userInfo valueForKey:UIKeyboardBoundsUserInfoKey] getValue: &t]; 
     r.origin.y += t.size.height; 
     bar.frame = r; 
    } 

Answer 2

这会给你一个想法

How to make a UITextField move up when keyboard is present?

Answer 3

如果parentview是的UIScrollView然后尝试在文本框代表

 
- (BOOL) textFieldShouldReturn:(UITextField *)theTextField 
{ 

    if (theTextField == textFieldName) { 
     [scroll scrollRectToVisible:CGRectMake(0, 160, 280, 440) animated:YES];//choose the rect accordingly. 
    } 
    return YES; 

}