Everyone loves Smarties! And much the same way Smarties Candies make you smarter… today we are talking about Code Snippets that make you….er Smarter! More than a source of cut/paste Objective C source code, this is meant to be a quick reference. As such, some of these will be incomplete and I will be filling them up as I go along.
1) UIAlertView
UIAlertView *internetAlert = [[UIAlertView alloc] initWithTitle:@”No hay farmacias”
message:@”Favor cambie sus parámetros”
delegate:self
cancelButtonTitle:@”Cancelar”
otherButtonTitles:@”Ok”, nil];
[internetAlert show];
2) NSNotification
//1. Register as observer of notifications in viewDidLoad
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(receiveTestNotification:) name:@”TestNotification” object:nil];
//2. NSNotifCtr CLEANUP in viewDidUnload
[[NSNotificationCenter defaultCenter] removeObserver:self];
//4. Post notif to NSNotif in calling method OTHER CLASS
[[NSNotificationCenter defaultCenter]
postNotificationName:@”TestNotification”
object:self];
//3. Method to prove notif received…
– (void) receiveTestNotification:(NSNotification *) notification
{
if ([[notification name] isEqualToString:@”TestNotification”])
NSLog (@”Successfully received the test notification!”);
}
3) UIActivityIndicator – NSTimer – then completion blocks
//1. Set activity indicator
UIApplication *sharedApplication = [UIApplication sharedApplication];
sharedApplication.networkActivityIndicatorVisible = YES;
//INSERT NSTimer here J
//2. Hide activity indicator
UIApplication *sharedApplication = [UIApplication sharedApplication];
sharedApplication.networkActivityIndicatorVisible = NO;
works the same with an IBOutlet UIActivityIndicator
4) UISearchBar
UISearchBarDelegate, UISearchDisplayDelegate
@property (strong,nonatomic) NSMutableArray *filteredResultsArray;
@property (strong,nonatomic) IBOutlet UISearchBar *resultsSearchBar;
//UISearch in INIT or LOAD method
// Initialize the filteredResults array with its count of Locations NSManagedObjects
self.filteredResultsArray = [NSMutableArray arrayWithCapacity:[self.originalArray count]];
//ios6 refresh control ONLY
if ([UIRefreshControl class]) {
self.refreshControl = [[UIRefreshControl alloc] init];
[self.refreshControl addTarget:self action:@selector(reload) forControlEvents:UIControlEventValueChanged];
[self reload];
[self.refreshControl beginRefreshing];
} else {
//do nothing
}
//nORIS
if (tableView == self.searchDisplayController.searchResultsTableView) {
return [filteredResultsArray count];
} else {
return [self.originalArray count];
}
//cFRAIP
if (tableView == self.searchDisplayController.searchResultsTableView) {
// IF ITS A SEARCH TABLE…>>>>>>>>>>
//Use filteredResultsArray data
} else {
//Otherwise use self.originalArray
}
5) Reminders & Events
/////////EVENTS
// SPECIAL CALENDAR OBJECT CLASS
#import <EventKit/EventKit.h>
+(EKEventStore*)eventStore;
+(EKCalendar*)calendar;
+(EKCalendar*)createAppCalendar;
// WHAT IT DOES
static EKEventStore* eStore = NULL;
+(EKEventStore*)eventStore{
//keep a static instance of eventStore
if (!eStore) {
eStore = [[EKEventStore alloc] init];
}
return eStore;
}
+(EKCalendar*)createAppCalendar
{
EKEventStore *store = [self eventStore];
//1 fetch the local event store source
EKSource* localSource = nil;
for (EKSource* src in store.sources) {
if (src.sourceType == EKSourceTypeCalDAV) {
localSource = src;
}
if (src.sourceType == EKSourceTypeLocal && localSource==nil) {
localSource = src;
}
}
if (!localSource) return nil;
//2 CREATE A NEW CALEDNAR FOR ITEMS!!!!!!!!!!!!!!!
EKCalendar* newCalendar = [EKCalendar calendarWithEventStore: store];
newCalendar.title = kAppCalendarTitle;
newCalendar.source = localSource;
newCalendar.CGColor = [[UIColor colorWithRed:0.8 green:0.2 blue:0.6 alpha:1] CGColor];
//3 save the calendar in the event store
NSError* error = nil;
[store saveCalendar: newCalendar commit:YES error:&error];
if (!error) {
return nil;
}
//4 store the calendar id
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
[prefs setValue:newCalendar.calendarIdentifier forKey:@”appCalendar”];
[prefs synchronize]; return newCalendar;
}
+(EKCalendar*)calendar{
//1
EKCalendar* result = nil;
EKEventStore *store = [self eventStore];
//2 check for a persisted calendar id
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
NSString *calendarId = [prefs stringForKey:@”appCalendar”];
//3
if (calendarId && (result = [store calendarWithIdentifier: calendarId])) {
return result;
}
//4 check if calendar name exists
for (EKCalendar* cal in store.calendars) {
if ([cal.title compare: kAppCalendarTitle]==NSOrderedSame) {
if (cal.immutable == NO) {
[prefs setValue:cal.calendarIdentifier
forKey:@”appCalendar”]; [prefs synchronize]; return cal;
}
}
}
//5 if no calendar is found whatsoever, create one
result = [self createAppCalendar];
//6
return result;
}
// ADD ENTRY FROM VC THRU CALEDNAR OBJECT
-(void)addItem:(NSDictionary*)item toCalendar:(EKCalendar*)calendar{
EKEvent* event = [EKEvent eventWithEventStore:[AppCalendar eventStore]];
event.calendar = calendar;
EKAlarm* myAlarm = [EKAlarm alarmWithRelativeOffset: – 06*60 ];
[event addAlarm: myAlarm];
NSDateFormatter* frm = [[NSDateFormatter alloc] init];
[frm setDateFormat:@”MM/dd/yyyy HH:mm zzz”];
[frm setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@”en_US”]];
event.startDate = [frm dateFromString:[show objectForKey:@”startDate”]];
event.endDate = [frm dateFromString:[show objectForKey:@”endDate”]];
event.title = [item objectForKey:@”title”];
event.URL = [NSURL URLWithString:[item objectForKey:@”url”]];
event.location = @”My Office”;
event.notes = [item objectForKey:@”tip”];
//add recurrence
NSNumber* weekDay = [item objectForKey:@”dayOfTheWeek”];
EKRecurrenceDayOfWeek* itemDay = [EKRecurrenceDayOfWeek dayOfWeek: [weekDay intValue]];
EKRecurrenceEnd* runFor3Months = [EKRecurrenceEnd recurrenceEndWithOccurrenceCount:12];
EKRecurrenceRule* myReccurrence = [[EKRecurrenceRule alloc] initRecurrenceWithFrequency:EKRecurrenceFrequencyWeekly interval:1
daysOfTheWeek:[NSArray arrayWithObject:itemDay] daysOfTheMonth:nil monthsOfTheYear:nil weeksOfTheYear:nil daysOfTheYear:nil setPositions:nil end:runFor3Months];
[event addRecurrenceRule: myReccurrence];
//1 save the event to the calendar
NSError* error = nil;
[[AppCalendar eventStore] saveEvent:event span:EKSpanFutureEvents commit:YES error:&error];
//2 show the edit event dialogue
EKEventEditViewController* editEvent = [[EKEventEditViewController alloc] init];
editEvent.eventStore = [AppCalendar eventStore]; editEvent.event = event;
editEvent.editViewDelegate = self;
[self presentViewController:editEvent animated:YES completion:^{
UINavigationItem* item = [editEvent.navigationBar.items objectAtIndex:0]; item.leftBarButtonItem = nil;
}];
}
//////REMINDERS
//EVENT CLASS OBJECT
– (id) init {
self = [super init];
if (self) {
_eventStore = [[EKEventStore alloc] init];
[_eventStore requestAccessToEntityType:EKEntityTypeEvent
completion:^(BOOL granted, NSError *error) {
if (granted) {
_eventAccess = YES;
} else {
NSLog(@”Event access not granted: %@”, error);
}
}];
[_eventStore requestAccessToEntityType:EKEntityTypeReminder completion:^(BOOL granted, NSError *error) {
if (granted) { _reminderAccess = YES;
} else {
NSLog(@”Reminder access not granted: %@”, error);
}
}];
//Initialize the dispatch queue
_fetchQueue = dispatch_queue_create(“com.santiapps.fetchQueue”, DISPATCH_QUEUE_SERIAL);
}
return self;
}
//LOOP THRU CALENDARS
NSArray * allCalendars = [_eventStore calendarsForEntityType:EKEntityMaskEvent |
EKEntityMaskReminder]; NSMutableArray * writableCalendars = [NSMutableArray array]; for (EKCalendar * calendar in allCalendars) {
if (calendar.allowsContentModifications) { [writableCalendars addObject:calendar];
} }
EKCalendar *calendar = eventStore.defaultCalendarForNewEvents;
//CREATE EVENT
//1
EKEvent *event = [EKEvent eventWithEventStore:eventStore]; event.title = @”Hello world!”; event.startDate = startDate; event.endDate = endDate;
EKAlarm *alarm = [EKAlarm alarmWithRelativeOffset:-1800]; [event addAlarm:alarm];
event.calendar = eventStore.defaultCalendarForNewEvents;
//2
NSError *err; BOOL saved = [eventStore saveEvent:event span:EKSpanThisEvent commit:YES error:&err];
if (!saved) { NSLog(@”Error creating the event”);
}
//REMINDER
//1
EKReminder *reminder = [EKReminder reminderWithEventStore:eventStore];
reminder.title = @”Creating my first reminder”; reminder.calendar = [eventStore defaultCalendarForNewReminders];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSUInteger unitFlags = NSEraCalendarUnit |
NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit;
NSDateComponents *dueDateComponents = [calendar components:unitFlags fromDate:dueDate];
//1.5. Set the due date
reminder.dueDateComponents = dueDateComponents;
//2
NSError *err;
BOOL success =
[eventStore saveReminder:reminder commit:YES error:&err];
if (!success) { NSLog(@”Error creating reminder”);
}
6) Local Notifications
//test notif
NSDate *date = [NSDate dateWithTimeIntervalSinceNow:10];
UILocalNotification *localNotification = [[UILocalNotification alloc] init];
localNotification.fireDate = date;
localNotification.timeZone = [NSTimeZone defaultTimeZone];
localNotification.alertBody = @”I am a local notification!”;
localNotification.soundName = UILocalNotificationDefaultSoundName;
[[UIApplication sharedApplication] scheduleLocalNotification:localNotification];
7) Sort NSArrays for tableviews
-(void)sort{
NSSortDescriptor *sortDescriptor;
sortDescriptor = [[[NSSortDescriptor alloc] initWithKey:@”distance” ascending:YES] autorelease];
NSArray *sortDescriptors = [NSArray arrayWithObject:sortDescriptor];
NSArray *sortedArray;
sortedArray = [self.annotationsToSort sortedArrayUsingDescriptors:sortDescriptors];
self.annotationsToSort = [(NSArray*)sortedArray mutableCopy];
[self.tableView performSelector:@selector(reloadData) withObject:nil afterDelay:0.5];
}
8) Contacts
// Read Contact list xml formatted (Array of Dictionaries)
//read directory here
dispatch_async(kBgQueue , ^{
contacts = [NSArray arrayWithContentsOfURL: kContactsList];
dispatch_async(dispatch_get_main_queue(), ^{
[self.tableView reloadData]; });
});
// Do this
//NO ADD THEM TO AB
dispatch_async(kBgQueue , ^{
NSString* request = [NSString stringWithFormat:@”%@?%@”, kContactsList, ids]; //1
NSData *responseData = [NSData dataWithContentsOfURL:[NSURL URLWithString:request]]; //2
//parse vCard data
ABAddressBookRef addressBook = ABAddressBookCreate(); //1
ABRecordRef record = ABPersonCreate(); //2
NSArray* importedPeople = (__bridge_transfer NSArray*)
ABPersonCreatePeopleInSourceWithVCardRepresentation( record, (__bridge CFDataRef)responseData); //3
CFBridgingRelease(record); //4
//define few constants
__block NSMutableString* message = [NSMutableString stringWithString:
@”Contacts imported AB. Add them in Facebook: “];
NSString* serviceKey = (NSString*)kABPersonSocialProfileServiceKey;
NSString* facebookValue = (NSString*)
kABPersonSocialProfileServiceFacebook;
NSString* usernameKey = (NSString*)kABPersonSocialProfileUsernameKey;
//loop over people and get their facebook
for (int i=0;i<[importedPeople count];i++) { //1
ABRecordRef personRef = (__bridge ABRecordRef) [importedPeople objectAtIndex:i];
ABAddressBookAddRecord(addressBook, personRef, nil);
//2
ABMultiValueRef profilesRef = ABRecordCopyValue( personRef, kABPersonSocialProfileProperty);
NSArray* profiles = (__bridge_transfer NSArray*) ABMultiValueCopyArrayOfAllValues(profilesRef);
//3
for (NSDictionary* profile in profiles) { //4
NSString* curServiceValue = [profile objectForKey:serviceKey]; //5
if ([facebookValue compare: curServiceValue] == NSOrderedSame) { //6
[message appendFormat: @”%@, “, [profile objectForKey: usernameKey]];
}
}
//7
CFBridgingRelease(profilesRef);
}
//save to addressbook
ABAddressBookSave(addressBook, nil);
CFBridgingRelease(addressBook);
//show done alert
dispatch_async(dispatch_get_main_queue(), ^{ [[[UIAlertView alloc]
initWithTitle: @”Done!” message: message
delegate: nil cancelButtonTitle:@”OK” otherButtonTitles:nil] show];
});
});
9) Mapkit
//CHECK LOCATION SERVICES
-(void)checkLocationServices{
BOOL locationAllowed = [CLLocationManager locationServicesEnabled];
if (locationAllowed==NO) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@”Location Service Disabled”
message:@”Re-enable in Settings for this app.”
delegate:nil
cancelButtonTitle:@”OK”
otherButtonTitles:nil];
[alert show];
[alert release];
}
}
//GET LOCATION
-(void)getLocation{
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.distanceFilter = 10;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation];
//- (void)startMonitoringSignificantLocationChanges
_mapView.showsUserLocation = YES;
}
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations {
self.userLocation = [locations lastObject];
NSLog(@”userLocation is %f, %f”, self.userLocation.coordinate.latitude, self.userLocation.coordinate.longitude);
CLLocationCoordinate2D zoomLocation;
zoomLocation.latitude = self.userLocation.coordinate.latitude;
zoomLocation.longitude = self.userLocation.coordinate.longitude;
NSLog(@”Using %g,%g”, zoomLocation.latitude, zoomLocation.longitude);
//StopUpdating Location so it wont change all the time
[locationManager stopUpdatingLocation];
}
//GET ANNOTATIONS
CLLocation *pinLocation = [[CLLocation alloc] initWithLatitude:annotation.coordinate.latitude longitude:annotation.coordinate.longitude];
CLLocationDistance calculatedDistance = [pinLocation distanceFromLocation:self.userLocation];
annotation.distance = calculatedDistance/1000;
//PLOT ANNOTATIONS
-(void)plotAnnotations{
//Clean out old annotations
for (id<MKAnnotation> annotation in _mapView.annotations) {
[_mapView removeAnnotation:annotation];
}
//THIS LOGS THE LOCATIONSTOSORT ARRAY OF FVC
//NSLog(@”self.myLocationsToSort %@”, self.myLocationsToSort);
for (MyLocation *annotation in self.myLocationsToSort) {
//Add annotation to mapview
[_mapView addAnnotation:annotation];
}
}
– (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation {
static NSString *identifier = @”MyLocation”;
if ([annotation isKindOfClass:[MyLocation class]]) {
//test if mapviewnil
if (_mapView == nil) {
NSLog(@”NIL”);
}
MKPinAnnotationView *annotationView = (MKPinAnnotationView *) [_mapView dequeueReusableAnnotationViewWithIdentifier:identifier];
if (annotationView == nil) {
annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];
annotationView.enabled = YES;
annotationView.canShowCallout = YES;
annotationView.image=[UIImage imageNamed:@”arrest.png”];
} else {
annotationView.annotation = annotation;
}
//instatiate a detail-disclosure button and set it to appear on right side of annotation
UIButton *infoButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
//[infoButton addTarget:self action:@selector(showDetailView:annotationView.annotation) forControlEvents:UIControlEventTouchUpInside];
annotationView.rightCalloutAccessoryView = infoButton;
return annotationView;
}
return nil;
}
//GET ANNOTATIONS
//ZOOM INTO LOCATION
– (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation {
// We have location, do your logic of setting the map region here.
CLLocationCoordinate2D zoomLocation;
NSLog(@”location in FirstVC %@”, self.userLocation);
//Test if userLocation has a value
NSLog(@”NOCITYSELECTED vDL FVC”);
zoomLocation.latitude = self.userLocation.coordinate.latitude;
zoomLocation.longitude = self.userLocation.coordinate.longitude;
CLLocationDistance visibleDistance = 5000; // 5 kilometers
MKCoordinateRegion adjustedRegion = MKCoordinateRegionMakeWithDistance(zoomLocation, visibleDistance, visibleDistance);
[_mapView setRegion:adjustedRegion animated:YES];
}
//TAP ON PINS – ANNOTATIONS
//Called when disclosure tapped
– (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control{
if (![view.annotation isKindOfClass:[MyLocation class]])
return;
// use the annotation view as the sender
[self performSegueWithIdentifier:@”DetailVC” sender:view];
}
10) UICustomization/Appearance
[[UINavigationBar appearance] setShadowImage:[[UIImage alloc] init]];
[self.tabBarItem setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIFont fontWithName:@”Futura” size:10.0f], UITextAttributeFont, nil] forState:UIControlStateNormal];
UIImage *gradientImage32 = [[UIImage imageNamed:@”FirstCellLogo.png”] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 0, 0, 0)];
[[UINavigationBar appearance] setBackgroundImage:gradientImage32 forBarMetrics:UIBarMetricsDefault];
[self.tabBarItem setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIFont fontWithName:@”Futura” size:10.0f], UITextAttributeFont, nil] forState:UIControlStateNormal];
[[UITabBar appearance] setSelectedImageTintColor:[UIColor redColor]];
11) LetterPress Effect
//letterpress effect the label
//NSMutableAttributedString
NSMutableAttributedString *restName = [[NSMutableAttributedString alloc] initWithString:self.attributionText.text];
[restName addAttributes:@{ NSTextEffectAttributeName : NSTextEffectLetterpressStyle, NSFontAttributeName: [UIFont preferredFontForTextStyle:UIFontTextStyleHeadline] } range:NSMakeRange(0, restName.length)];
self.attributionText.attributedText = restName;
12) UIGesture
13) iCloud
14) Library.a
15) Instruments
16) Checklist App
17) UICollectionView & UIContainerView & SplitVC & Popover
18) SlideUp
19) Raised Tabbar
20) Passbook
21) AR
22) Export Data
23) TF
24) iAds & AppiRater
25) TimeCmoparator – String Parsing
26) UIApplicationDelegate sharedApplication & its methods
27) NSUserDefaults
// call the store object
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
// set an object for it
[prefs setObject:imageView.image forKey:@”keyToLookupImage”];
// call sync to save it
[prefs synchronize];
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
UIImage *retrievedImage = [prefs stringForKey:@”keyToLookupImage”];
imageView.image = retrievedImage;
28) Façade design pattern
29) Protocols & Delegates
30) InAppPurchases
31) Datepicker/uipicker
32) NSOperation
33) Date Formatter
NSDate *date = [NSDate date];
NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[dateFormatter setDateStyle:NSDateFormatterShortStyle];
[dateFormatter setTimeStyle:NSDateFormatterFullStyle];
NSString *formattedDateString = [dateFormatter stringFromDate:date];
NSLog(@”formattedDateString for locale %@: %@”,
[[dateFormatter locale] localeIdentifier], formattedDateString);
timeLabel.text = [dateFormatter stringFromDate:date];
34) Letterpress Effect
35) asd