Using Reachability in iOS

Add the SystemConfiguration framework


#import "Reachability.h"

-(BOOL)reachable {
    NSString *hostName = @"google.com";
    Reachability *r = [Reachability reachabilityWithHostName:hostName];
    NetworkStatus internetStatus = [r currentReachabilityStatus];
    if(internetStatus == NotReachable) {
        return NO;
    }
    return YES;
}


if ([self reachable]) {
    NSLog(@"Reachable");
}
else {
    NSLog(@"Not Reachable");
}

Creating PopOverView for iPad

-(void)showPickerView : (NSString *)aScore{

  

  UIViewController* popoverContentViewController = [[UIViewController alloc] init];

  

  UIView *popoverView = [[UIView alloc] init];   //view

  popoverView.backgroundColor = [UIColor whiteColor];

  

  

  // Load tempView

  

  UIView *tempView   = nil;

  NSArray *arr   = nil;

  CGRect frame   = CGRectZero;

  CGRect popOverFrame = CGRectZero;

  

  if([aScore isEqualToString:@"performanceScore"]){

arr = [[NSBundle mainBundle] loadNibNamed:@"PerformanceScoreView" owner:self options:nil];

tempView = [arr objectAtIndex:0];

popOverFrame = CGRectMake(0, 0, 200, 150);

frame = self.performanceScoreTitleLbl.frame;

  } else {

arr = [[NSBundle mainBundle] loadNibNamed:@"BreeamScoreView" owner:self options:nil];

tempView = [arr objectAtIndex:0];

popOverFrame = CGRectMake(0, 0, 220, 380);

frame = self.breeamScoreTitleLbl.frame;

  }

  

  [popoverView addSubview:tempView];

  popoverContentViewController.view = popoverView;

  

  

  popoverController = [[UIPopoverController alloc] initWithContentViewController:popoverContentViewController];

  [popoverController setPopoverContentSize:CGSizeMake(popOverFrame.size.width, popOverFrame.size.height) animated:NO];

  [popoverController presentPopoverFromRect:frame inView:self permittedArrowDirections:UIPopoverArrowDirectionLeft animated:YES];

}

Reading from JSON File in ObjectiveC

NSString *fileName = @"property3.json";

NSString *filePath = [[[NSBundle mainBundle] bundlePath] stringByAppendingPathComponent:fileName];

NSString *jsonString = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];

NSData *jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];

NSError *jsonError = nil;

NSDictionary *propertyDict = [NSJSONSerialization JSONObjectWithData:jsonData options:kNilOptions error:&jsonError];

if(jsonError) {

  NSLog(@"jsonError : %@", [jsonError localizedDescription]);

} else {

  //NSLog(@"propertyDict : %@", propertyDict);

}

iOS 6.0 to iOS 7.0 full screen transition

self.edgesForExtendedLayout =  UIRectEdgeTop | UIRectEdgeLeft | UIRectEdgeBottom | UIRectEdgeRight;

Unwind Segue Programmatically

#pragma mark - Trigger for unwind seque programmatically

- (IBAction) done: (id)sender

{

        SEL theUnwindSelector = @selector(goToRoot:);

        NSString *unwindSegueIdentifier = @"unwindToRootSeque";

     

        UINavigationController *nc = [self navigationController];

        // Find the view controller that has this unwindAction selector (may not be one in the nav stack)

        UIViewController *viewControllerToCallUnwindSelectorOn = [nc viewControllerForUnwindSegueAction: theUnwindSelector

                                                                                     fromViewController: self

                                                                                             withSender: sender];

        // None found, then do nothing.

        if (viewControllerToCallUnwindSelectorOn == nil) {

            NSLog(@"No controller found to unwind too");

            return;

        }

     

        // Can the controller that we found perform the unwind segue.  (This is decided by that controllers implementation of canPerformSeque: method

        BOOL cps = [viewControllerToCallUnwindSelectorOn canPerformUnwindSegueAction: theUnwindSelector

                                                                  fromViewController: self

                                                                          withSender: sender];

        // If we have permision to perform the seque on the controller where the unwindAction is implmented

        // then get the segue object and perform it.

        if (cps) {

             

            UIStoryboardSegue *unwindSegue = [nc segueForUnwindingToViewController: viewControllerToCallUnwindSelectorOn fromViewController: self identifier: unwindSegueIdentifier];

 

            [viewControllerToCallUnwindSelectorOn prepareForSegue: unwindSegue sender: self];

             

            [unwindSegue perform];

        }  

}