Marlunes

//viewDidload
   if ([self respondsToSelector:@selector(setNeedsStatusBarAppearanceUpdate)]) {
        // iOS 7
        [self prefersStatusBarHidden];
        [self performSelector:@selector(setNeedsStatusBarAppearanceUpdate)];
    } else {
        // iOS 6
        [[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationSlide];
    }

Marlunes

//in AppDelegate.m

// Add this inside NSPersistenStoreCoordinator delegate
/* Note: NSPersistenStoreCoordinator delegate is automatically created if you create
 empty application and selected "use Core Data"

*/

NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
                             [NSNumber numberWithBool:YES],

Marlunes

//all stuffs will be on the Appdelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
   //some appdelegate codes here......
    
    [self checkDatabaseIfExists]; //Makes sure that the app has a database
    
    //some appdelegate codes here ......
   

Marlunes

/*
  To call:

  myArray = [self fetchDataWithEntityName:@"Employees"  withSortDescriptorKey:@"name"  withPredicateFormat:[NSPredicate predicateWithFormat:@"employee == %@", myEmployeeName];

*/
- (NSArray *)fetchDataWithEntityName:(NSString *)entityName  withSortDescriptorKey:(NSString *) sortDescriptorKey withPredicateFormat:(NSPredicate *)predicateFormat{
    
    NSEntityDescription *entity = [NSEntityDescription entityForName:entityName inManagedObjectContext:context];
    

Marlunes

/* To call:

resizedImage = [self imageByScalingProportionallyToSize:myImageView.size usingImage:myImage];

*/

//Method: 
- (UIImage *)imageByScalingProportionallyToSize:(CGSize)targetSize usingImage:(UIImage *)image{
    
    UIImage *sourceImage = image;

markSci5

#import <Foundation/Foundation.h>

@interface MySingleton : NSObject

- (id)sharedInstance;

@end