segue通過后圖片將不會顯示

Question

如標題所示，我試圖在UIImageview中顯示UIImage，問題是它不會顯示。 在我展示它之前，我從另一個角度通過了segue。 當我斷點時，我看到分配了UIImage但沒有圖片顯示，我嘗試將其設置為靜態圖片，並且效果很好。

相關代碼應為...

在FirstViewController.m中

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{

    UIImage* img = [info objectForKey:UIImagePickerControllerOriginalImage];

    if (picker.sourceType == UIImagePickerControllerSourceTypePhotoLibrary) {
        NSLog(@"Bild hämtad!");
        [self moveImage];
    }
    else
    {
    UIImageWriteToSavedPhotosAlbum(img, self, @selector(image:didFinishSavingWithError:contextInfo:), Nil);
    }

    [picker dismissModalViewControllerAnimated:YES];
    [MBProgressHUD showHUDAddedTo:self.view animated:YES];
}

- (void)image: (UIImage *)image didFinishSavingWithError: (NSError *) error contextInfo: (void *) contextInfo{

    if (!error) {
        NSLog(@"Bild sparad!");
        [self moveImage];
    }
    else{
        NSLog(@"%@",error);
    }
}
-(void)moveImage
{   
    [self performSegueWithIdentifier:@"ImageEdit" sender:self];
    [MBProgressHUD hideHUDForView:self.view animated:YES];
    NSLog(@"Bild Flyttad!");

}
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:self
{
    if ([[segue identifier] isEqualToString:@"ImageEdit"])
    {
        [segue.destinationViewController setMImage:image];
    }

}

在ImageEditController.m中

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    [imageView setImage:_mImage];
    NSLog(@"Bild Visas!");
}

我知道有很多代碼，但是我認為發布多於少總比更好。

Answer 1

您是否曾經初始化過imageView？

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    imageView = [[UIImageView alloc] init];
    [imageView setImage:_mImage];
    NSLog(@"Bild Visas!");
}

如果從未初始化過該函數，則對其進行的任何函數調用都只會靜默失敗（在nil指針上調用一個函數不會執行任何操作）。