UITextView 和 UIPickerView 都有自己的 UIToolbar

Question

我喜欢在我自己的应用程序中复制 iPhone 上 Safari 的表单行为。 如果您在 Web 表单中输入数据，您将在 UIKeyboardView 上方获得一个单独的 UIToolbar（上一个、下一个、完成）。 选择选项也是如此：您会在 UIPickerView 上方得到相同的 UIToolbar。

我正在寻找如何实现这一点的演示/源代码/想法。 我会使用该工具栏和文本视图/选择器视图创建自己的子视图吗？ 有更优雅的方式吗？ 特别是利用 UITextfield 的 beginResponder 的东西？

Answer 1

所以我创建了一个 UIViewCOntroller 子类来管理它。

对此我编写了这个函数来添加。

-(void) addToViewWithAnimation:(UIView *) theView
{
    UIView* myview = self.view;
    CGRect frame = myview.frame;
    frame.origin.y = 420;
    myview.frame = frame;

    UIView* bgView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 420)];
    bgView.backgroundColor = [UIColor blackColor];
    bgView.alpha = 0.6;
    backgroundView = bgView;
    [theView addSubview: bgView];  // this adds in the dark background

    [theView addSubview:self.view]; // this adds in the pickerView with toolbar.
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.5];  
    frame = myview.frame;
    frame.origin.y = 420 - frame.size.height;
    myview.frame = frame;

    [UIView commitAnimations];
 }

然后我在 IB 中创建了视图，这是我的类标题最后的样子。 （视图上还有一个 UItoolbar，我只是在控制器中没有引用它）

@interface PropertyPickerController : UIViewController {
    IBOutlet UIPickerView* Picker;
    IBOutlet UIButton* DoneButton;
    IBOutlet UIButton* CancelButton;
    UIView* backgroundView;
    NSArray* SimpleObjects;
    id PickerObjectDelegate;
    SEL PickerObjectSelector;
}

然后隐藏我使用的视图。

-(void) removeFromSuperviewWithAnimation
{

    UIView* myview = self.view;
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationDidStopSelector:@selector(AnimationDidStop:)];
    [UIView setAnimationDuration:0.5];  
    // set fram below window.   
    CGRect frame = myview.frame;
    frame.origin.y = 420;
    myview.frame = frame;
    backgroundView.alpha = 0;  //fades shade to nothing
    [UIView commitAnimations];
}

-(void) AnimationDidStop:(id) object
{
    [self.view removeFromSuperview];  //removes view after animations.
    [backgroundView removeFromSuperview];
}

最后但并非最不重要的一点是选择器的所有委托函数。

    - (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
    {
        FBSimpleObject* object = (FBSimpleObject*)[SimpleObjects objectAtIndex:row];
        return object.Name;
    }

    - (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
    {   
    }
    - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
    { return 1;}

    - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
    {
        return [SimpleObjects count];
    }

    - (IBAction)CancelButtonClick
    {
            [self removeFromSuperviewWithAnimation];
    }
    - (IBAction)DoneButtonClick
    {   
//This performs a selector when the done button is clicked, makes the controller more versatile.
if(PickerObjectDelegate && PickerObjectSelector)
        {
            NSMethodSignature* signature = [PickerObjectDelegate methodSignatureForSelector:PickerObjectSelector];  
            NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:signature];
            [invocation setTarget:PickerObjectDelegate];
            [invocation setSelector:PickerObjectSelector];
            [invocation setArgument:&object atIndex:2];
            [invocation retainArguments];
            [invocation invoke];
        }
    }

这就是工具栏的制作方法。 基本上我使用与 ViewController 子类相同的概念，并且我不使用标准的推送视图或模式显示选项。 （这里的示例实际上在键盘顶部放置了一个文本框和一个工具栏。

@interface BugEditCommentController : UIViewController {
UITextView* 评论；
UIToolbar* 工具栏；
}
-(void) addToViewWithAnimation:(UIView*) theView;

要激活此视图，通常您可以调用 [object comeFirstResponder];
因此，如果将其添加到视图控制器构造函数中，您所需要做的就是调用 [objectbecomeFirstResponder];

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

abd 如果您在控制器上实现此方法（在上面的代码中定义），

-(void) keyboardWillShow:(NSNotification *) note
{
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.3];

    CGRect toolbarFrame  = Toolbar.frame;
    CGRect keyboardFrame;
    CGPoint keyboardCenter;
    [[note.userInfo valueForKey:UIKeyboardCenterEndUserInfoKey] getValue:&keyboardCenter];
    [[note.userInfo valueForKey:UIKeyboardBoundsUserInfoKey] getValue: &keyboardFrame];

    //CGRect toolbarRect = Toolbar.center;
    toolbarFrame.origin.y= keyboardCenter.y - ((keyboardFrame.size.height/2) + (toolbarFrame.size.height));
    Toolbar.frame = toolbarFrame;
    [UIView commitAnimations];

}

-(void) keyboardWillHide:(id) object
{

//you could call [self removeFromSuperviewHere];
}

-(void) removeFromsuperViewWithAnimation
{
    [Comment resignFirstResponder];
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.3];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationDidStopSelector:@selector(AnimationDidStop:)];

    CGRect frame = Toolbar.frame;
    frame.origin.y = 480;
    Toolbar.frame = frame;

    [self.view viewWithTag:1].alpha = 0;  //fade transparent black background to clear.
    [UIView commitAnimations];

}
-(void)AnimationDidStop:(id) object
{
    [self.view removeFromSuperview];
}

希望附加信息有所帮助。

Answer 2

我也在寻找这个问题的解决方案。

我发现这是最好的解决方案，您可以使用此 SCKit 添加工具栏来根据需要关闭 UIPickerView 或 UIDatePicker。

以下是 github 链接： https://github.com/scelis/SCKit/tree/

有乐趣！