文件ios问题-无法识别选择器

Question

这是我的代码：

- (void)viewDidLoad
{
    [super viewDidLoad];
    textBox = [[UITextField alloc] initWithFrame:CGRectMake(10, 50, 300, 40)];
    [textBox setDelegate:self];
    [self.view addSubview:textBox];
    [textBox release];
    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [button addTarget:self action:@selector(saveText) forControlEvents:UIControlEventTouchUpInside];
    [button setTitle:@"Save" forState:UIControlStateNormal];
    button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0);
    [self.view addSubview:button];

    NSFileManager *filemgr;
    NSString *dataFile;
    NSString *docsDir;
    NSArray *dirPaths;
    filemgr = [NSFileManager defaultManager];
    // Identify the documents directory
    dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSLog(@"PATH--->  %@",dirPaths);
    docsDir = [dirPaths objectAtIndex:0];
    // Build the path to the data file
    dataFile = [docsDir stringByAppendingPathComponent: @"datafile.dat"];
    // Check if the file already exists
    if ([filemgr fileExistsAtPath: dataFile])
    {
        // Read file contents and display in textBox
        NSData *databuffer;
        databuffer = [filemgr contentsAtPath: dataFile];
        NSString *datastring = [[NSString alloc] initWithData: databuffer encoding:NSASCIIStringEncoding];
        textBox.text = datastring;
        [datastring release];
    }
    [filemgr release];
    [super viewDidLoad];
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder]; 
    return YES; 
}
- (void)saveText:(id)sender
{ 
    NSLog(@"Text saved");
}

如果我尝试执行这个，我会得到一个错误，说

"2013-02-18 12:43:46.194 FileExample[1475:207]-[FileExampleViewController saveText]：无法识别的选择器发送到实例0x682e730"

我是iOS新手，无法识别、理解或首次出现此错误。

Answer 1

更改您的此行

[button addTarget:self action:@selector(saveText) forControlEvents:UIControlEventTouchUpInside];

用这个

 [button addTarget:self action:@selector(saveText:) forControlEvents:UIControlEventTouchUpInside];

或

做这个

- (void)saveText // removed  " :(id)sender "
 { 
    NSLog(@"Text saved");
 }