Value transfer issue

Is there any explanation why the NSLog always displays null when running this code?

ExtratoDeNotasSideMenuViewController *extratoDeNotasSideMenuViewController =   [[ExtratoDeNotasSideMenuViewController alloc] init];
extratoDeNotasSideMenuViewController.userImageView.image = [UIImage imageNamed:@"Icone_SideBar.png"];
NSLog(@"%@", extratoDeNotasSideMenuViewController.userImageView.image);

2014-10-28 13:40:50.594 E-proinfo[913:51418] (null)

Solution

Potential causes:

Your ExtratoDeNotasSideMenuViewController init returned nil because there was an error during initialization.
```
NSLog(@"%@", extratoDeNotasSideMenuViewController); // Does this display '(null)'?
```
Your userImageView isn't initialized yet because you don't initialize it in ExtratoDeNotasSideMenuViewController init.
```
NSLog(@"%@", extratoDeNotasSideMenuViewController.userImageView); // Does this display '(null)'?
```
Your image is nil because you don't have an image named Icone_SideBar.png.

You should either add NSLog statements or add a breakpoint and use po to inspect your objects.

Edit: If you want to set something on your view controller before your view is created (or as a persistent thing between view creations if you expect your view controller to destroy its view and then recreate it at some point), you should use a property.

Consider the following:

@interface ExtratoDeNotasSideMenuViewController
@property (strong) UIImage *myUserImage;
...
@end

@implementation ExtratoDeNotasSideMenuViewController
...
- (void)loadView {
  [super loadView];
  ...
  [self.userImageView setImage:self.myUserImage];
  ...
}
...
@end

...
  ExtratoDeNotasSideMenuViewController *extratoDeNotasSideMenuViewController =   [[ExtratoDeNotasSideMenuViewController alloc] init];
  extratoDeNotasSideMenuViewController.myUserImage = [UIImage imageNamed:@"Icone_SideBar.png"];