无法从另一个视图控制器设置UIImageView图像

Question

The first view controller calls this method that sends the image

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

...
[wallPostCreateViewController viewDidLoad];

  [wallPostCreateViewController selectImage:wallPostCreateViewController.myImage];

NSLog(@"FROM PAWWallViewController %@",wallPostCreateViewController.myImage); //Image is there


}

I receive the image in the second view controller but it fails to put the image into its UIImageView.

- (void)selectImage:(UIImage *)img
{

if (self.condition)
{
    NSLog(@"View loaded!"); //is loaded
    [self selectImageNow:img];
    self.condition = NO;
}
else
    NSLog(@"View did NOT load!");


}
- (void)selectImageNow: (UIImage *)img
{

    NSLog(@"Image passed  %@", img); // This is the UIImage being passed.

    self.imageView = [[UIImageView alloc] initWithImage:img];
    self.imageView.image = img;

    NSLog(@"Image in view  %@", self.imageView.image); //has value
    NSLog(@"Imageview  %@", self.imageView); //has value


 }

UPDATED:

The code above is updated now. All of the logs now have values but I still see no image or image view when I run the app

Answer 1

将UIImage object从一个UIImage object发送到另一个ViewController然后将该UIImage分配给SecondController ViewWillAppear或ViewDidLoad方法中的UIImageView 。

Answer 2

The issue seems like your imgView is nil. So make sure that your method should not get called, before your view has been loaded.

Answer 3

I think you need to set the imageView of first view controller in prepareForSegue method that is in the second view controller, where you will have your destination to be the first view controller, do something like this in the second view controller:

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{

    if([segue.identifier isEqualToString:@"firstVwCtrl"]){

    FirstViewController *frstVwCtrl = [segue destinationViewController];
    [frstVwCtrl setImgGot:_photoView.image];

          }  }