Question

我正在使用UIImagePickerController将照片添加到照片和计划的应用目录中，其中父ViewController是一个tableViewController。我在表的其他地方报告的问题没有使用dismissModalViewController上添加的文件刷新，并且我已经读过dismissModalViewController不会在父控制器中触发viewWillAppear，我看到@WrightCS使用NSNotificationCenter {{3}回答}。但是，当我尝试它时，我得到了以下内容：

- [MapTableViewController someMethodToReloadTable]：无法识别的选择器发送到实例0x1d5ca330

我使用的代码在这里：

- (void)viewDidLoad
{

    AppDelegate *delegate = [[UIApplication sharedApplication] delegate];
    self.mapPath = delegate.mapPath;

    [super viewDidLoad];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(someMethodToReloadTable) name:@"reloadTable" object:nil];

........

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    image=[info objectForKey:UIImagePickerControllerOriginalImage];
    pageSize = image.size;
    CGRect imageBoundsRect = CGRectMake(0, 0, pageSize.width, pageSize.height);
     NSString *path = [self.mapPath stringByAppendingPathComponent: @"image.pdf"];


    UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
    [self generatePdfWithFilePath:path];

    [self dismissModalViewControllerAnimated:YES];
    NSLog(@"dismiss  triggered");
    [[NSNotificationCenter defaultCenter] postNotificationName:@"reloadTable" object:self];
    NSLog(@"notification fired");



}

- (void)someMethodToReloadTable:(NSNotification *)notification
{ NSLog(@"notification  triggered");
    [self.tableView reloadData];
}

-(void)viewDidUnload
{
    [[NSNotificationCenter defaultCenter] removeObserver:self name:@"reloadTable" object:nil];
}

Answer 1

您的someMethodToReloadTable方法需要参数，因此viewDidLoad中的选择器需要:。

变化：

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(someMethodToReloadTable) name:@"reloadTable" object:nil];

为：

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(someMethodToReloadTable:) name:@"reloadTable" object:nil];

使用NSNotificationCenter在dismissModalViewController上刷新tableView

1 个答案: