objective C view is not being loaded on physical device

Question

I am using XCode 4.2 to develop an application for iPhone and iPad

I am loading a view using the following function

-(IBAction)button{
    ...
    SettingsView *hello ;   
    hello= [[SettingsView alloc] initWithNibName:nil bundle:nil];
    [self presentModalViewController:hello animated:YES];
}

on the simulator the view is loaded perfectly . but when I load the app on a real iPhone , I get a white screen and cannot go back to the app ... any reasons ?

Answer 1

The most common cause of this kind of problem is a case mismatch. since you passed nil as the name, it'll try to load SettingsView.nib . If your file is called Settingsview.nib (note the "v"), then that will work on Mac (most of the time, and simulator) but not on iOS. By default, Mac has a case-insensitive filesystem. iOS always has a case-sensitive file system.

---

After you've built for device, go to ~/Library/Developer/Xcode/DerivedData and find your project output. Dig down into the Products directory and make sure that your nib file is really there and named what you expect.

Answer 2

if no .xib is associated with it then use this code:

SettingsView *hello= [[SettingsView alloc] initWithNibName:nil bundle:nil];
[self presentModalViewController:hello animated:YES];
[hello release];

if there is a .xib associated with it

SettingsView *hello= [[SettingsView alloc] initWithNibName:@"SettingsView" bundle:nil];
[self presentModalViewController:hello animated:YES];
[hello release];

Answer 3

try setting view frame and modalPresentationStyle

SettingsView *hello= [[SettingsView alloc] initWithNibName:@"SettingsView" bundle:nil];

hello.view.frame = CGRectMake(<CGFloat x>, <CGFloat y>, <CGFloat width>, <CGFloat height>)
hello.modalPresentationStyle = UIModalPresentationFormSheet;

[self presentModalViewController:hello animated:YES];
[hello release];

And from where (what is self??) are you trying to present a modalviewcontroller??