Setting the title of a ViewController:
self.title = @"Clock In Time";
Setting the field placeholder:
signOutTimeField.placeholder = @"Time to Clock Out of Work";
Bending the corners of a button
cancelJobButton.layer.cornerRadius = 8;
cancelJobButton.layer.borderWidth = 1;
cancelJobButton.layer.borderColor = [UIColor grayColor].CGColor;
cancelJobButton.clipsToBounds = YES;
Adding a Return Key to the Keyboard and Calling a method ("hideKeyBoard:") after the Keyboard Retracts
emailAddressField.returnKeyType=UIReturnKeyDone;
[emailAddressField addTarget:self action:@selector(hideKeyBoard:)
forControlEvents:UIControlEventEditingDidEndOnExit];
Defining a Method for Keyboard Retraction
-(void)hideKeyBoard: (id) sender
{
//Hiding the Keyboard
if ([sender tag] == 0) {
[emailAddressField resignFirstResponder];
}
else if ([sender tag] == 1) {
[passwordField resignFirstResponder];
}
[UIView beginAnimations:nil context:NULL];
//Setting the animation duration
[UIView setAnimationDuration:1];
CGRect rect = self.view.frame;
//Resetting the origin to 0
rect.origin.y = 0;
self.view.frame = rect;
[UIView commitAnimations];
}
Getting the ViewController to 'Roll' up and down when the Keyboard Retracts:
- (void)textFieldBegin:(NSNotification *)notif
{
UITextField *obj= [notif object];NSNumber *offsetValue=[[NSNumber alloc]
initWithFloat:obj.frame.origin.y];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.5];
//Get a reference to the frame
CGRect rect = self.view.frame;
//Set the origin to a new value
rect.origin.y = 60.0-[offsetValue floatValue];
//Adjust the views height
rect.size.height += [offsetValue floatValue]-60.0;
//Commit the changes to the current frame
self.view.frame = rect;
//Commit the animations
[UIView commitAnimations];
}
Adding an Observer and Removing an Observer when the view Appears and a View Disappears
- (void)viewWillDisappear:(BOOL)animated
{
// unregister for textfield notifications while not visible.
[[NSNotificationCenter defaultCenter] removeObserver:self
name:UITextFieldTextDidBeginEditingNotification object:nil];
}
-(void) viewWillAppear:(BOOL)animated
{
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector
(textFieldBegin:) name:UITextFieldTextDidBeginEditingNotification object:self.view.window];
[super viewWillAppear:animated];
}
Building an Alert
alert = [[UIAlertView alloc]
initWithTitle:@"Unverified"
message:@"Please enter a new name and password."
delegate:nil cancelButtonTitle:@"OK"
otherButtonTitles:nil];
[alert show];
[alert release];
Trimming the Whitespace from a NSString
cellPhoneNumberString = [cellPhoneNumberTextField.text stringByTrimmingCharactersInSet:
[NSCharacterSet whitespaceCharacterSet]];
Accessing a Restful Service:
NSString *urlString = @"http://www.samplesite.com/dtdOrdersExist.pl?";
NSString *queryString = @"";
queryString = [queryString stringByAppendingString:@"parameter1="];
queryString = [queryString stringByAppendingString:p1];
queryString = [queryString stringByAppendingString:@"parameter2="];
queryString = [queryString stringByAppendingString:p2];
// Step 5: Make the RESTful call.
urlString = [urlString stringByAppendingString:queryString];
urlString = [urlString stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding];
NSLog(@"ConfirmationCodeViewController URL String: %@", urlString);
// {cellPhoneNumberConfirmed => $cellPhoneNumberConfirmed, cellPhoneNumber => $cellPhoneNumber, customerID => $customerID};
// RESTFUL CODE BLOCK A
NSURL *url = [NSURL URLWithString:urlString];
NSData *dataURL = [NSData dataWithContentsOfURL:url];
NSDictionary *myDict = [NSJSONSerialization JSONObjectWithData:dataURL options:0 error:nil];
// Step 6: Retrieve the data from the RESTful call
NSString* numberOfOrders = [myDict objectForKey:@"numberOfOrders"];
NSLog(@"Post JSON: Verified jsonCustomerID: %@", numberOfOrders);
return numberOfOrders;
Pushing a New ViewController:
CourierViewController *cvc = [[CourierViewController alloc]
initWithNibName:@"CourierViewController"
bundle:nil];
[self.navigationController pushViewController:cvc animated:YES];
[cvc release];
Trimming Leading and trailing Whitespaces off NSString:
NSString *trimmedString = [string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]
-(NSManagedObjectContext *)deleteCustomerObject: (NSManagedObjectContext *) context
{
NSLog(@"deleteCustomerObject");
// self.navigationController = [[UINavigationController alloc] initWithNibName:@"Go_For_MeViewController" bundle:nil];
// NSManagedObjectContext* context = [fetchedResultsController managedObjectContext];
if (context == nil)
{
context = [(Go_For_MeAppDelegate *)[[UIApplication sharedApplication] delegate] managedObjectContext];
NSLog(@"After managedObjectContext: %@", context);
}
NSLog(@"GFMVC: Test Point 1");
// INPUT THE ENTITY NAME SLATED FOR DELETION HERE
NSEntityDescription *entityDesc = [NSEntityDescription entityForName:@"CustomerInformation"
inManagedObjectContext:context];
NSFetchRequest *request = [[NSFetchRequest alloc] init];
[request setEntity:entityDesc];
// NSPredicate *pred = [NSPredicate predicateWithFormat:@"(loggedIn == 1)"];
// [request setPredicate:pred];
NSError *error = nil;
NSArray *results = [context executeFetchRequest:request error:&error];
/*
entityDesc = [NSEntityDescription entityForName:@"jobData"
inManagedObjectContext:context];
[request setEntity:entityDesc];
pred = [NSPredicate predicateWithFormat:@"(jobCompleted == NO)"];
[request setPredicate:pred];
NSError *jobsError = nil;
NSArray *jobsResults = [context executeFetchRequest:request error:&jobsError];
*/
if (results != nil && [results count] >= 0)
{
NSLog(@"GFMVC: Valid Request Results");
int size = [results count];
NSLog(@"GFMVC: Number of Results: %d", size);
// DELETING THE OBJECTS IN THE MANAGED OBJECT CONTEXT.
for (NSManagedObject *newManagedObject in results)
{
// [self printContext:newManagedObject];
[context deleteObject:newManagedObject];
}
[self saveContext:context];
return context;
}
else if (results == nil)
{
[self saveContext:context];
return context;
}
[self saveContext:context];
return context;
}
How to Save an object with a relationship. BOOYAH!
[customerManagedObject setValue:ordersManagedObject forKey:@"customerToOrders"];
-- customerManagedObject -- the object that is the parent
-- ordersManagedObject -- the object that is the child object
-- customerToOrders -- the name of the relationship object
Setting up UIPickerView:
UIPickerView Set Up
Making UIPickerView Appear When UITextField is Selected
Printing a Date and a Time:
timeLoggedIn = [NSDateFormatter localizedStringFromDate:[managedObj valueForKey:@"timeLoggedIn"]
dateStyle:NSDateFormatterShortStyle
timeStyle:NSDateFormatterFullStyle];
Changing ViewControllers with Storyboard Programatically:
If you're in a Navigation Controller:
ViewController *viewController = [[ViewController alloc] init];
[self.navigationController pushViewController:viewController animated:YES];
or if you just want to present a new view:
ViewController *viewController = [[ViewController alloc] init];
[self presentViewController:viewController animated:YES completion:nil];
MySQL:
Alter a column: Dropping the NOT NULL provision:
ALTER TABLE tbl_name MODIFY columnA varchar(6) NULL DEFAULT NULL;
