如何在PickerView上添加一个按钮以及如何在单击该按钮时关闭PickerView？

Question

我有一个UIPickerView.我想在pickerview的顶部有一个完成按钮,我想在点击完成按钮时关闭选择器视图.你可以帮帮我吗？

Answer 1

在您的视图中添加操作表,然后在操作表顶部添加带有完成按钮的工具栏,然后在完成按钮中将您的选择器添加到操作表单击下面的写入方法以关闭操作表

[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];
}