Objective c 如何显示源自UiButton的操作表

我有一个uiButton，我想显示一个源自它的操作表。 这是我的关闭按钮代码

+ (void)addLeftButton:(UINavigationItem *)navItem withTarget:(id) navTarget
{
    UIBarButtonItem *fixedSpace = [[UIBarButtonItem alloc]   initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
    [fixedSpace setWidth:-5];

    UIImage *buttonImage = [UIImage imageNamed:@"close-button.png"];

    UIButton *closeButton = [UIButton buttonWithType:UIButtonTypeCustom];

    [closeButton setBackgroundImage:buttonImage forState:UIControlStateNormal];

    closeButton.frame = CGRectMake(0.0, 0.0, buttonImage.size.width,   buttonImage.size.height);

    UIBarButtonItem *aBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:closeButton];

    [closeButton addTarget:navTarget action:@selector(didSelectCloseButton:) forControlEvents:UIControlEventTouchUpInside];

    [navItem setLeftBarButtonItems:[NSArray arrayWithObjects:fixedSpace,aBarButtonItem,nil]];
}

此操作用于关闭按钮

+ (void)addLeftButton:(UINavigationItem *)navItem withTarget:(id) navTarget
{
    UIBarButtonItem *fixedSpace = [[UIBarButtonItem alloc]   initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
    [fixedSpace setWidth:-5];

    UIImage *buttonImage = [UIImage imageNamed:@"close-button.png"];

    UIButton *closeButton = [UIButton buttonWithType:UIButtonTypeCustom];

    [closeButton setBackgroundImage:buttonImage forState:UIControlStateNormal];

    closeButton.frame = CGRectMake(0.0, 0.0, buttonImage.size.width,   buttonImage.size.height);

    UIBarButtonItem *aBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:closeButton];

    [closeButton addTarget:navTarget action:@selector(didSelectCloseButton:) forControlEvents:UIControlEventTouchUpInside];

    [navItem setLeftBarButtonItems:[NSArray arrayWithObjects:fixedSpace,aBarButtonItem,nil]];
}

（iAction）选择关闭按钮：（id）发送者 {

在showActionSheet中我有这个代码

(void) showActionSheet:(id)sender

{

         if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
                [self->_actionSheet showFromBarButtonItem:sender animated:YES];

}

---

//此处showFromBarButtonItem以uiButton的形式获取发件人，但它会崩溃。单击“关闭”按钮时，应用程序会崩溃。

您可以这样做：

UIAlertAction *action1;
UIAlertAction *actionCancel;

action1 = [UIAlertAction actionWithTitle:@"action1"                                              style:UIAlertActionStyleDefault handler:nil];                                         
actionCancel = [UIAlertAction actionWithTitle:@"cancel" style:UIAlertActionStyleDestructive handler:nil];

UIAlertController *alertView = [UIAlertController alertControllerWithTitle:@"alert" message:nil preferredStyle:UIAlertControllerStyleActionSheet];

alertView.modalPresentationStyle = UIModalPresentationPopover; // for iPad

[alertView addAction:action1];
[alertView addAction:actionCancel];

if (viewSourse) { // Here your button 

    alertView.popoverPresentationController.sourceView = viewSourse;
    alertView.popoverPresentationController.sourceRect =  CGRectMake(viewSourse.frame.size.width/2, viewSourse.frame.size.height/2, 0, 0);
}

 [self presentViewController:alertView animated:YES completion:nil];

---

这是行动表代码

- (IBAction)showActionSheet:(id)sender {

    /* Dismiss keyboard*/

    UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:@"What ever you want to ask?" delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:@"Delete it" otherButtonTitles:@"Copy", @"Duplicate", nil]; //Change the options that you want to display as per your requirement.

    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
        // In this case the device is an iPad.
        [actionSheet showFromRect:[(UIButton *)sender frame] inView:self.view animated:YES];
    }
    else{
        // In this case the device is an iPhone/iPod Touch.
        [actionSheet showInView:self.view];
    }

}

#pragma mark - UIActionSheet method implementation

-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{

  NSLog(@"Index = %d - Title = %@", buttonIndex, [actionSheet buttonTitleAtIndex:buttonIndex]);
}

-(void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex{
   NSLog(@"Action sheet did dismiss");
 }


-(void)actionSheet:(UIActionSheet *)actionSheet willDismissWithButtonIndex:(NSInteger)buttonIndex{
   NSLog(@"Action sheet will dismiss");
}

/*更新*/

iOS 8.3及更高版本中不推荐使用上述内容，因此您可以使用以下UIAlertController

此外，如果用户点击按钮时键盘处于打开状态，则键盘会自动关闭，并让UIAlertController显示选项

UIAlertController *alertController;
    UIAlertAction *destroyAction;
    UIAlertAction *otherAction;

    alertController = [UIAlertController alertControllerWithTitle:nil
                                                          message:nil
                                                   preferredStyle:UIAlertControllerStyleActionSheet];
    destroyAction = [UIAlertAction actionWithTitle:@"Remove All Data"
                                             style:UIAlertActionStyleDestructive
                                           handler:^(UIAlertAction *action) {
                                               // do destructive stuff here
                                           }];
    otherAction = [UIAlertAction actionWithTitle:@"Blah"
                                           style:UIAlertActionStyleDefault
                                         handler:^(UIAlertAction *action) {
                                             // do something here
                                         }];
    // note: you can control the order buttons are shown, unlike UIActionSheet
    [alertController addAction:destroyAction];
    [alertController addAction:otherAction];
    [alertController setModalPresentationStyle:UIModalPresentationPopover];

    UIPopoverPresentationController *popPresenter = [alertController
                                                     popoverPresentationController];

    UIButton *btn = (UIButton *)sender;

    popPresenter.sourceView = btn;
    popPresenter.sourceRect = [btn bounds];
    [self presentViewController:alertController animated:YES completion:nil];

---

提前感谢…崩溃时控制台中出现了什么？错误？还有，为什么不使用UIActionSheet？我得到了：“无法识别的选择器发送到实例”崩溃时出现错误消息。要显示操作表，我使用的是“showFromBarButtonItem”，但我使用的按钮不是barButtonItem。因此它引发了一个错误。我本应使用“showFromRect”替代。当模拟器中的键盘未打开时，它看起来非常完美，但当模拟器的软件键盘打开时，操作表显示为shown以不同的方式。@Nikhil:我已经用最新的方法（UIAlertController）更新了代码，并在一个演示上进行了尝试，以使其正常工作。我通过在按钮单击时取消键盘上的键值来解决了键盘问题。因此，操作表正确显示为现在键值存在。下次我将尝试UIAlertController而不是操作表。