UIBarButtonItem 调用 UIActionsheet

Question

在主视图中，单击一行有一个导航控制器，调用详细视图并

添加一个按钮SemimereListinView.m

#import "SeminareListingView.h"
#import "Seminar.h"


-(void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    //gehe zurück zum ersten View
    //NSLog(@"Received Data in seminareArray");

    Seminar *dvController = [[Seminar alloc] initWithNibName:@"Seminar" bundle:nil];

    NSString *selectedSeminarURL = [seminarURLArray objectAtIndex:indexPath.row];
    //NSString *selectedNextXMLFile = [kategorienNextXMLFileArray objectAtIndex:indexPath.row];

    dvController.seminarURLFromXML = selectedSeminarURL;
    //dvController.XMLFile = selectedNextXMLFile;

    [self.navigationController pushViewController:dvController animated:YES];


    //Zeige den PDF Download Button
    UIBarButtonItem *anotherButton = [[UIBarButtonItem alloc] initWithTitle:@"PDF Download" style:UIBarButtonItemStylePlain target:self action:@selector(showMenu)];

    //anotherButton.action = @selector(showMenu);

    dvController.navigationItem.rightBarButtonItem = anotherButton;

    [anotherButton release];

    [dvController release];
    dvController = nil;


    //[[self navigationController] popViewControllerAnimated:YES];
}

在研讨会视图中

有此方法Seminar.m

- (void) showMenu
{
    UIActionSheet *myMenu = [[UIActionSheet alloc]
                             initWithTitle: @"Überschrift"
                             delegate:self
                             cancelButtonTitle:@"Abbrechen"
                             destructiveButtonTitle:@"Etwas unwiderrufliches"
                             otherButtonTitles:@"Eins", @"Zwei", nil];
    [myMenu showInView:self.view];
}

但我通过单击按钮收到错误

2011-07-07 12:57:31.009 Seminar App2[4352:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[SeminareListingView showMenu]: unrecognized selector sent to instance 0x6305f90'
*** Call stack at first throw:

Answer 1

坎吉

UIBarButtonItem *anotherButton = [[UIBarButtonItem alloc] initWithTitle:@"PDF Download" style:UIBarButtonItemStylePlain target:self action:@selector(showMenu)];

(Cange) 前往：

UIBarButtonItem *anotherButton = [[UIBarButtonItem alloc] initWithTitle:@"PDF Download" style:UIBarButtonItemStylePlain target:dvController action:@selector(showMenu)];

Answer 2

看起来您正在 Seminar 类中实现 showMenu 方法，但您告诉栏按钮在 SeminareListingView 上调用它目的。如果是这种情况，那么您需要将栏按钮的委托设置为 Seminar 类的实例。

Answer 3

你做错了。将您的 barButton ite 代码放入研讨会的 viewDidLoad 中。您正在添加目标 self，它表示堆栈的当前视图，而您实际上想要将目标分配给研讨会控制器。因此，请剪切从 cellForRowMethod 到研讨会控制器的 viewDidLoad 的代码（添加 BarButtonItem）。