如何在 PickerView 顶部添加按钮以及如何在单击该按钮时关闭 PickerView？

Question

我有一个 UIPickerView。我想要在选择器视图顶部有一个完成按钮，并且我想在单击完成按钮时关闭选择器视图。你能帮我解决这个问题吗？

Answer 1

将操作表添加到您的视图中，然后添加带有完成按钮的工具栏
在操作表的顶部和下面将您的选择器添加到操作表
在“完成”按钮中，单击下面的方法来关闭操作表

[actionSheet dismissWithClickedButtonIndex:0 animated:YES];

actionSheet=[[UIActionSheet alloc] initWithTitle:@"" delegate:self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:nil];
    [actionSheet showInView:self.view];
UIToolbar *pickerToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0,320,40)];
[pickerToolbar sizeToFit];
    pickerToolbar.barStyle = UIBarStyleBlackTranslucent;
NSMutableArray *barItems = [[NSMutableArray alloc] init];

    UIBarButtonItem *cancelBtn = [[UIBarButtonItem alloc] initWithTitle:@"Cancel" style:UIBarButtonSystemItemCancel target:self action:@selector(cancel_clicked:)];
    [barItems addObject:cancelBtn];
    [cancelBtn release];
    UIBarButtonItem *flexSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
    [barItems addObject:flexSpace];
    [flexSpace release];
    UIBarButtonItem *doneBtn = [[UIBarButtonItem alloc] initWithTitle:@"Done" style:UIBarButtonItemStyleDone target:self action:@selector(done_clicked:)];
    [barItems addObject:doneBtn];
    [doneBtn release];
    [pickerToolbar setItems:barItems animated:YES];
    [actionSheet addSubview:pickerToolbar];
    [barItems release];
    [pickerToolbar release];

UIPickerView *picker = [[UIPickerView alloc] init];
picker.frame = CGRectMake(0, 44, 320, 216);
picker.delegate  = self;
        picker.dataSource = self;
        picker.showsSelectionIndicator = YES;
[actionSheet addSubview:picker];
[picker release];

-(void)done_clicked:(id)sender
{
    [actionSheet dismissWithClickedButtonIndex:0 animated:YES];
}
-(void)cancel_clicked:(id)sender
{
    [actionSheet dismissWithClickedButtonIndex:0 animated:YES];
}

Answer 2

您可以使用工具栏来达到相同的目的。查看此链接 。这里，考虑相同的解决方案。希望这可以帮助你。谢谢。

Answer 3

每个主体都采用操作表，然后添加栏按钮，但只是从视图中添加 uibutton 并采取方法从超级视图中删除。显示以下示例，我尝试此代码成功。我认为这是非常有用的代码，无需使用操作表

 -(void)parserDidEndDocument:(NSXMLParser *)parser { NSLog(@"the marray data is %@",marray); // [self showpicker1]; if (marray.count == 0) { UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"Error" message:@"NO DATA FOUND" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil]; [alert show]; }

[self showpicker1];
}

-(void)showpicker1 { //view1=[[UIView alloc] initWithFrame:CGRectMake(55, 59, 171, 80)]; //[self.view addSubview:view1]; pv = [[UIPickerView alloc] initWithFrame:CGRectMake(55,79,171,0)]; pv.delegate = self; pv.dataSource = self; pv.showsSelectionIndicator = YES; [self.view addSubview:pv]; done=[UIButton buttonWithType:UIButtonTypeRoundedRect]; [done setFrame:CGRectMake(55, 59, 171, 20)]; [done setTitle:@"DONE" forState:UIControlStateNormal]; [done addTarget:self action:@selector(dismiss) forControlEvents:UIControlEventTouchDown]; [self.view addSubview:done]; } -(void)dismiss { [pv removeFromSuperview]; [done removeFromSuperview]; }