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我在视图上有一些 UITextField，当它被点击时会弹出键盘。还有一个按钮可以导航到另一个视图。当我在键盘处于活动状态的情况下从该视图导航到第二个视图时出现问题。当我从第二个视图返回时，键盘将自行出现。我该如何防止这种情况？

   -(IBAction) loginButton:(id) sender
    {
        [currentTextField resignFirstResponder];
        RequestPage *RequestPageview = [[RequestPage alloc] initWithNibName:nil bundle:nil];


        [UIView beginAnimations:@"flipping view" context:nil];
        [UIView setAnimationDuration:1];
        [UIView setAnimationCurve:UIViewAnimationCurveLinear];
        [UIView setAnimationTransition:UIViewAnimationTransitionCurlUp
                               forView:self.view.superview
                                 cache:YES];

        [UIView commitAnimations];
        [self presentModalViewController:RequestPageview animated:YES];
        //ß[self.view addSubview:RequestPageview.view];
    }
//---when the keyboard appears---
-(void) keyboardDidShow:(NSNotification *) notification {
    if (keyboardIsShown) return;

    NSDictionary* info = [notification userInfo];

    //---obtain the size of the keyboard---
    NSValue *aValue =
    [info objectForKey:UIKeyboardFrameEndUserInfoKey];
    CGRect keyboardRect =
    [self.view convertRect:[aValue CGRectValue] fromView:nil];


    //---resize the scroll view (with keyboard)---
    CGRect viewFrame = [scrollview frame];
    NSLog(@"%f", viewFrame.size.height);
    viewFrame.size.height -= keyboardRect.size.height;
    scrollview.frame = viewFrame;
    NSLog(@"%f", keyboardRect.size.height);
    NSLog(@"%f", viewFrame.size.height);
    //---scroll to the current text field---
    CGRect textFieldRect = [currentTextField frame];
    [scrollview scrollRectToVisible:textFieldRect animated:YES];
    keyboardIsShown = YES;
        NSLog(@"Login Keyboard appear");
}

//---when the keyboard disappears---
-(void) keyboardDidHide:(NSNotification *) notification {
    NSDictionary* info = [notification userInfo];

    //---obtain the size of the keyboard---
    NSValue* aValue =
    [info objectForKey:UIKeyboardFrameEndUserInfoKey];
    CGRect keyboardRect =
    [self.view convertRect:[aValue CGRectValue] fromView:nil];


    //---resize the scroll view back to the original size
    // (without keyboard)---
    CGRect viewFrame = [scrollview frame];
    viewFrame.size.height += keyboardRect.size.height;
    scrollview.frame = viewFrame;

    keyboardIsShown = NO;
        NSLog(@"Login Keyboard disappear");
}


2011-05-27 16:57:20.628 LoginPage[322:207] Login view appear // loaded the app
2011-05-27 16:57:32.220 LoginPage[322:207] Login Keyboard appear // tap on textfield
2011-05-27 16:57:35.665 LoginPage[322:207] Request view appeared // navigate to second view with keyboard shown
2011-05-27 16:57:35.667 LoginPage[322:207] Login view disappear
2011-05-27 16:57:35.978 LoginPage[322:207] Request Keyboard disappear // weird? I should have hide the Login Keyboard instead
2011-05-27 16:57:39.738 LoginPage[322:207] Login view appear // navigate back
2011-05-27 16:57:39.740 LoginPage[322:207] Request view disappeared
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2 回答 2

1

如果您想在点击按钮时隐藏键盘并且如果您有多个文本字段，那么您可以使用此代码...

[self.view endEditing:YES];

点击视图中的任何位置，键盘将消失...

享受 ！！...

于 2012-12-21T14:03:11.897 回答
0

在 loginButton 方法中，调用resignFirstResponder正在编辑的文本字段。当用户导航回该视图控制器时，键盘将不再存在。您需要稍微更改您的代码，以便您可以参考文本字段。如果只有一个文本字段，IBOutlet 就可以了。对于多个字段，让您的视图控制器成为委托，并且您可以在用户开始编辑时保留对当前文本字段的引用。您还可以遍历视图的子视图，尽管这可能效率不高。

于 2011-05-26T16:11:37.197 回答