@interface UIProgressIndicator : UIActivityIndicatorView {
}

+ (struct CGSize)size;
- (int)progressIndicatorStyle;
- (void)setProgressIndicatorStyle:(int)fp8;
- (void)setStyle:(int)fp8;
- (void)setAnimating:(BOOL)fp8;
- (void)startAnimation;
- (void)stopAnimation;
@end

@interface UIProgressHUD : UIView {
    UIProgressIndicator *_progressIndicator;
    UILabel *_progressMessage;
    UIImageView *_doneView;
    UIWindow *_parentWindow;
    struct {
        unsigned int isShowing:1;
        unsigned int isShowingText:1;
        unsigned int fixedFrame:1;
        unsigned int reserved:30;
    } _progressHUDFlags;
}

- (id)_progressIndicator;
- (id)initWithFrame:(struct CGRect)fp8;
- (void)setText:(id)fp8;
- (void)setShowsText:(BOOL)fp8;
- (void)setFontSize:(int)fp8;
- (void)drawRect:(struct CGRect)fp8;
- (void)layoutSubviews;
- (void)showInView:(id)fp8;
- (void)hide;
- (void)done;
- (void)dealloc;
@end

UIProgressHUD *progressHUD;

[self showProgressIndicator:@"Detecting"];

- (void)showProgressIndicator:(NSString *)text {
    //[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
    self.view.userInteractionEnabled = FALSE;
    if(!progressHUD) {
        CGFloat w = 160.0f, h = 120.0f;
        progressHUD = [[UIProgressHUD alloc] initWithFrame:CGRectMake((self.view.frame.size.width-w)/2, (self.view.frame.size.height-h)/2, w, h)];
        [progressHUD setText:text];
        [progressHUD showInView:self.view];
    }
}

- (void)hideProgressIndicator {
    //[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
    self.view.userInteractionEnabled = TRUE;
    if(progressHUD) {
        [progressHUD hide];
        [progressHUD release];
        progressHUD = nil;

        AudioServicesPlaySystemSound(alertSoundID);
    }
}

I have used an application similar to the one created in the tutorial presented here (IPhone SDK Hello World).

Step 2: Create a Settings Bundle

Create a new File Command + N and then select Settings from the side menu and Settings  Bundle. The file must be named Settings.bundle to work correctly. 










This will create two new files Root.strings and Root.plist. Open the Root.plist file and you should see the following screen listing some sample settings. This is actually a graphical representation of an XML file which defines the settings and how they are displayed. (You can see the xml code by right clicking the file and selecting Open as Plain Text)

Step 3: Define Settings Schema

The Root element has three child elements (1) Title; which defines the title of this settings view and is set to the name of the application. (2) StringTable; which is not covered in this tutorial. (3) PreferenceSpecifiers which contains all the settings we wish to elicit from the user. PreferenceSpecifiers has type Array and has a child element of type Dictionary for each setting: Item 1, item2 and so forth. We can add items by selecting PreferenceSpecifiers and clicking the Grey button at the end of the row.

Each setting has several properties of type string including the common required properties; Title and Type (Note all strings are case sensitive). The title defines the label displayed beside the control used to modify the setting and type defines the type of control used. There are seven possible controls which can be selected using the Type property:

PSGroupSpecifier

This is the simplest control and has only the two properties defined described above. It is used as a separator to break-up groups of similar settings. It cannot accept any input from the user.

PSTitleValueSpecifier

This displays a "Read Only" setting it cannot accept input from the user but can be used to display settings changed elsewhere.

DefaultValue:

Another String property which can store any text, this defines the Text that will be displayed in the specifier.

PSTextFieldSpecifier

The next type of control is the TextField, it has some additional properties which are listed below

DefaultValue:

Another String property which can store any text this defines the initial Text that will be entered into the TextField when it is first loaded.