为啥单击按钮时出现“无法识别的选择器”错误？

Posted 2023-05-07

【中文标题】为啥单击按钮时出现“无法识别的选择器”错误？

【英文标题】：Why am I getting a "unrecognized selector" error when I click on a button?为什么单击按钮时出现“无法识别的选择器”错误？

【发布时间】：2011-05-11 16:43:58

【问题描述】：

当我点击任何工具栏按钮时，我得到一个：

由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：'-[AddRecipientsTableViewController btnRemoteRecipients:]：无法识别的选择器发送到实例 0x4b87b10'

头文件

@interface AddRecipientsTableViewController : UITableViewController 



-(IBAction) btnLocalRecipients;
-(IBAction) btnRemoteRecipients;


@end

接口文件

#import "AddRecipientsTableViewController.h"


@implementation AddRecipientsTableViewController




-(IBAction) btnLocalRecipients



-(IBAction) btnRemoteRecipients





#pragma mark -
#pragma mark View lifecycle


- (void)viewDidLoad 
    [super viewDidLoad];







    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem;




- (void)viewWillAppear:(BOOL)animated 
    [super viewWillAppear:animated];


    self.navigationItem.title = @"Add Recipients";

    self.navigationController.toolbarHidden=NO;


    UIBarButtonItem            *localItem;
    UIBarButtonItem            *remoteItem;


    localItem = [[ UIBarButtonItem alloc ] initWithTitle: @"Local"
                                                   style: UIBarButtonItemStyleBordered
                                                  target: self
                                                  action: @selector( btnLocalRecipients: ) ];



    remoteItem = [[ UIBarButtonItem alloc ] initWithTitle: @"Remote"
                                                    style: UIBarButtonItemStyleBordered
                                                   target: self
                                                   action: @selector( btnRemoteRecipients: ) ];

    self.toolbarItems = nil ;

    self.toolbarItems = [ NSArray arrayWithObjects: localItem,remoteItem,nil ];

    [localItem release];
    [remoteItem release];




/*
- (void)viewDidAppear:(BOOL)animated 
    [super viewDidAppear:animated];

*/

- (void)viewWillDisappear:(BOOL)animated 
    [super viewWillDisappear:animated];

    self.navigationController.toolbarHidden=YES;




/*
- (void)viewDidDisappear:(BOOL)animated 
    [super viewDidDisappear:animated];

*/
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
    // Return YES for supported orientations.
    return (interfaceOrientation == UIInterfaceOrientationPortrait);

*/


#pragma mark -
#pragma mark Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView 
    // Return the number of sections.
    return 1;



- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 
    // Return the number of rows in the section.
    return 1;



// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 

    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) 
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
    

    // Configure the cell...

    return cell;



/*
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath 
    // Return NO if you do not want the specified item to be editable.
    return YES;

*/


/*
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath 

    if (editingStyle == UITableViewCellEditingStyleDelete) 
        // Delete the row from the data source.
        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
       
    else if (editingStyle == UITableViewCellEditingStyleInsert) 
        // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view.
       

*/


/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath 

*/


/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath 
    // Return NO if you do not want the item to be re-orderable.
    return YES;

*/


#pragma mark -
#pragma mark Table view delegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
    // Navigation logic may go here. Create and push another view controller.
    /*
    <#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:@"<#Nib name#>" bundle:nil];
    // ...
    // Pass the selected object to the new view controller.
    [self.navigationController pushViewController:detailViewController animated:YES];
    [detailViewController release];
    */



#pragma mark -
#pragma mark Memory management

- (void)didReceiveMemoryWarning 
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Relinquish ownership any cached data, images, etc. that aren't in use.


- (void)viewDidUnload 
    // Relinquish ownership of anything that can be recreated in viewDidLoad or on demand.
    // For example: self.myOutlet = nil;



- (void)dealloc 
    [super dealloc];



@end

【参考方案1】：

您需要在函数btnLocalRecipients 和btnRemoteRecipients 中添加:(id) sender。 试试

-(IBAction) btnLocalRecipients:(id) sender



-(IBAction) btnRemoteRecipients:(id) sender

【参考方案2】：

尝试从您的选择器中删除:。您声明的方法没有参数，因此它们的名称中没有 :。

【参考方案3】：

选择器应该是btnRemoteRecipients 而不是btnRemoteRecipients:（去掉:）