[Linux] Lock shell script

By using mkdir, it is a atomic lock.

Lock your script (against parallel run)

[iOS] Events in iOS

Event Handling Guide for iOS

[iOS] SMS/E-Mail

Message UI Framework Reference
System Message Programming Topics for iOS

Example:
MessageComposer
MailComposer

[iOS] Notification Center

Reference1
NSNotificationCenter Class Reference
Keyboard using NSNotificationCneter

[iOS] UIAlertView

UIAlert View with multiple options.

in .h: include UIAlertViewDelegate

@interface MyController : UIViewController <UIAlertViewDelegate> {

}

in .m: implement delegate for UIAlertViewDelegate

#pragma UIAlertView

- (void) alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {

    NSLog(@"%d", buttonIndex);

}

Reference1
Reference2: Works on later iOS5
How Can I customize UIAlertView

[iOS] UIActionSheet

UIActionSheet Class Reference
Move Cancel Button from top to bottom

In .h: include UIAlertViewDelegate

@interface MyController : UIViewController <UIAlertViewDelegate> {

}

In .m: implement delegates

- (void) ShowActionSheet:(NSString *)title {

    UIActionSheet *actionSheet = [[UIActionSheet alloc] 

                                  initWithTitle:title

                                  delegate:self

                                  cancelButtonTitle:nil

                                  destructiveButtonTitle:nil 

                                  otherButtonTitles: nil];

    

    [actionSheet addButtonWithTitle:@"Option 1"];

    [actionSheet addButtonWithTitle:@"Option 2"];

    [actionSheet addButtonWithTitle:@"Option 3"];

    [actionSheet addButtonWithTitle:@"Cancel"];

    actionSheet.cancelButtonIndex = actionSheet.numberOfButtons;

    

    [actionSheet showInView:self.view];

    [actionSheet release];

}

- (void) actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {

    NSLog(@"title=%@, buttonIndex: %d, cancelButtonIndex: %d, firstOtherButtonIndex: %d",

          actionSheet.title,

          buttonIndex, 

          actionSheet.cancelButtonIndex, 

          actionSheet.firstOtherButtonIndex);

}

[iOS] UIBarButtonSystemItem types

reference 1

reference 2

[iOS] Apple Certification Expired

When your Apple certification is expired, you have to remove it and request a new cert as well as provision profiles. Here is the solution for this issue.

Code Sign Errors: profile doesn’t match any valid certificate/private key pair in the default keychain