Differences of Struct and a class in iOS ?

Class usually stores data on heap memory where we need to manage memory allocations and deallocations manually because on heap memory does not destroy objects automatically after completing their respective tasks.Internally all these process takes some time to finish.

Classes are by default reference type so , whenever we create any instance for  any class functions for properties to hold. rather than creating a new copy they just creates a reference of the object . Where both the newly assigned object and existing object shares same memory address.

Thus how , altering the newly assigned object value can effect its existing object value because of same memory location.

Structs are stored on stack memory where objects gets stored on its individual stack and performs LIFO execution thus it makes easier to track and maintain the objects.

And moreover structs are fast compared to classes because stacks helps struct objects to destroy them immediately after performing its tasks. 

By default structs are value types . so , dealing with structs are pretty much easy because when ever we create any instance of struct object . It creates a copy of that instance . Hence modifications at one instance will not get altered at the other end because each instance has its different memory address.

Even many of apple libraries prefer structs over classes as it works faster and easier to maintain.

Iphone Facebook Sharings using objective c

Firstly,download facebook sdk for iphone from here

next,drag & drop this sdk folder into your xcode project. has to look like above screen shot.

import Facebook.h class in FbSharingownViewController.h file

//FbSharingownViewController.h

#import <UIKit/UIKit.h>
#import "Facebook.h"

@interface FbSharingownViewController : UIViewController<FBSessionDelegate,FBRequestDelegate>
{
    Facebook *facebook;
    BOOL ISFBCONNECTED;
    NSArray *permissions;
    UIView *v;
    UIProgressView *prog;
    UIButton *but,*but1,*but2,*but3,*but4;
    UIButton *UploadCancel;
}
@property(nonatomic,retain)Facebook *facebook;
@property(nonatomic)BOOL ISFBCONNECTED;
@end



//FbSharingownViewController.m






#import "FbSharingownViewController.h"

@interface FbSharingownViewController ()

@end

@implementation FbSharingownViewController
@synthesize facebook;
@synthesize ISFBCONNECTED;
- (void)viewDidLoad
{
    [super viewDidLoad];
   
 
    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 480, 320)];
    [imageView setImage:[UIImage imageNamed:@"social-networking-625x450.jpeg"]];
    [self.view addSubview:imageView];
    but1=[[UIButton alloc]init];
    but1=[UIButton buttonWithType:UIButtonTypeCustom];
    but1.backgroundColor=[UIColor colorWithRed:0.0 green:0.0 blue:0.5 alpha:0.6];
    but1.frame=CGRectMake(30, 120, 100, 40);
    [but1 setTitle:@"Login" forState:UIControlStateNormal];
    [but1 addTarget:self action:@selector(Login) forControlEvents:UIControlEventTouchUpInside];
  //  [but setImage:[UIImage imageNamed:@"blue.png"] forState:UIControlStateNormal];
    [self.view addSubview:but1];
    but2=[[UIButton alloc]init];
    but2=[UIButton buttonWithType:UIButtonTypeCustom];
    but2.backgroundColor=[UIColor colorWithRed:0.0 green:0.0 blue:0.5 alpha:0.6];
    but2.frame=CGRectMake(320, 120, 100, 40);
    [but2 setTitle:@"Logout" forState:UIControlStateNormal];
    [but2 addTarget:self action:@selector(Logout) forControlEvents:UIControlEventTouchUpInside];
   // [but setImage:[UIImage imageNamed:@"blue.png"] forState:UIControlStateNormal];
    [self.view addSubview:but2];
    but=[[UIButton alloc]init];
    but=[UIButton buttonWithType:UIButtonTypeCustom];
    but.backgroundColor=[UIColor colorWithRed:0.0 green:0.0 blue:0.5 alpha:0.6];
    but.frame=CGRectMake(150, 60, 150, 40);
    [but setTitle:@"Image To FB" forState:UIControlStateNormal];
    [but addTarget:self action:@selector(ImageToFB) forControlEvents:UIControlEventTouchUpInside];
    //  [but setImage:[UIImage imageNamed:@"blue.png"] forState:UIControlStateNormal];
    but.tag=0;
    [self.view addSubview:but];
    but3=[[UIButton alloc]init];
    but3=[UIButton buttonWithType:UIButtonTypeCustom];
    but3.backgroundColor=[UIColor colorWithRed:0.0 green:0.0 blue:0.5 alpha:0.6];
    but3.frame=CGRectMake(150, 120, 150, 40);
    [but3 setTitle:@"Message/Link To FB" forState:UIControlStateNormal];
    [but3 addTarget:self action:@selector(LinkMsg) forControlEvents:UIControlEventTouchUpInside];
    //  [but setImage:[UIImage imageNamed:@"blue.png"] forState:UIControlStateNormal];
    but3.tag=1;
    [self.view addSubview:but3];
    but4=[[UIButton alloc]init];
    but4=[UIButton buttonWithType:UIButtonTypeCustom];
    but4.backgroundColor=[UIColor colorWithRed:0.0 green:0.0 blue:0.5 alpha:0.6];
    but4.frame=CGRectMake(150, 180, 150, 40);
    [but4 setTitle:@"Video To FB" forState:UIControlStateNormal];
    [but4 addTarget:self action:@selector(VideoMsg) forControlEvents:UIControlEventTouchUpInside];
    //  [but setImage:[UIImage imageNamed:@"blue.png"] forState:UIControlStateNormal];
    but4.tag=2;
    [self.view addSubview:but4];

    // Do any additional setup after loading the view, typically from a nib.
}
-(void)Login
{
    facebook = [[Facebook alloc] initWithAppId:@"455462677804828" andDelegate:self];
    permissions = [[NSArray alloc] initWithObjects:@"publish_stream", nil];
    [self CheckForPreviouslySavedTokens];
   
    if (!ISFBCONNECTED)
    [facebook authorize:permissions];
   
    [permissions release];

}
-(void)Logout
{
    [facebook logout:self];
}
- (void)viewDidUnload
{
    [super viewDidUnload];
      // Release any retained subviews of the main view.
}
-(void)CheckForPreviouslySavedTokens
{
    ISFBCONNECTED=NO;
    //check if previous access token files are there in userdefault file
    NSUserDefaults *Default=[NSUserDefaults standardUserDefaults];
    if ([Default objectForKey:@"FBAccessTokenKey"]&&[Default objectForKey:@"FBExpirationDateKey"]) {
        facebook.accessToken=[Default objectForKey:@"FBAccessTokenKey"];
        facebook.expirationDate=[Default objectForKey:@"FBExpirationDateKey"];
       
        if (![facebook isSessionValid]) {
            [facebook authorize:nil];
            ISFBCONNECTED=NO;
        }
        else {
            ISFBCONNECTED=YES;
        }
    }
}
-(void)saveFBAccessTokenKeys
{
    NSUserDefaults *defaults=[NSUserDefaults standardUserDefaults];
    [defaults setObject:[facebook accessToken] forKey:@"FBAccessTokenKey"];
    [defaults setObject:[facebook expirationDate] forKey:@"FBExpirationDateKey"];
    [defaults synchronize];
}

-(void)removeSavedFacebookTokens
{
    NSUserDefaults *Default=[NSUserDefaults standardUserDefaults];
    if ((facebook.accessToken =[Default objectForKey:@"FBAcessTokenKey"])&&(facebook.expirationDate =[Default objectForKey:@"FBExpirationDateKey"])) {
    [Default removeObjectForKey:@"FBAccessTokenKey"];
    [Default removeObjectForKey:@"FBExpirationDateKey"];
    [Default release];
    }
}
/*fbsession delegate methods*/

- (void)fbDidLogin
{
    [self saveFBAccessTokenKeys];
    UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"LOgged IN" message:@"SuccessFully" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
    [alert show];
   
}

-(void)ImageToFB
{
    NSString *msg=@"hello Iphone,How R U?";
    UIImage*img=[UIImage imageNamed:@"castle-architecture-landscape-wallpapers-480x800.jpeg"];
    NSMutableDictionary *params=[NSMutableDictionary dictionaryWithObjectsAndKeys:img,@"source",msg,@"description", @"its all about testing iphone app with uiimage",@"title",nil];
    [facebook requestWithGraphPath:@"me/photos" andParams:params andHttpMethod:@"POST" andDelegate:self];

   
}
-(void)LinkMsg
{
    NSString *link=@"http://www.apple.com/";
    NSString *msg=@"check Out mY Test Link";
    NSMutableDictionary *params=[NSMutableDictionary dictionaryWithObjectsAndKeys:link,@"link",msg,@"message",nil];
    [facebook requestWithGraphPath:@"feed" andParams:params andHttpMethod:@"POST" andDelegate:self];

}
-(void)VideoMsg
{
    /* if recorded video is stored in path.... use below line and pass into videoData*/
    //NSString* recordedVideoOutputPath = [[NSString alloc] initWithFormat:@"%@/%@", [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0], @"initialVideo.mov"];
    /*for posting sample video from resources*/
    NSString *VideoFile=[[NSBundle mainBundle] pathForResource:@"sample" ofType:@"mov"];
    NSData *videoData = [NSData dataWithContentsOfFile:VideoFile];
   
    //displays the title and subtitle while posting video path.
    //NSLog(@"titl %@  des %@",self.title, self.description);//pass this ,if u use dynmaic text's to title key in params
    NSMutableDictionary *params = [NSMutableDictionary dictionaryWithObjectsAndKeys: videoData, @"video.mov", @"video/quicktime", @"contentType",@"VideoSAmple", @"title",@"Its all about testing video sharing for FB", @"description",nil];
   
    // posting video path to the facebook wall using http method.
    [facebook requestWithGraphPath:@"me/videos"  andParams:params  andHttpMethod:@"POST"  andDelegate:self];
   
   // [VideoFile release];
    //VideoFile = nil;

}
- (void)fbDidNotLogin:(BOOL)cancelled
{
   
}
- (void)fbDidLogout
{
    [self removeSavedFacebookTokens];
        UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"LOgged OUT" message:@"SuccessFully" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
    [alert show];
    }
- (void)fbSessionInvalidated
{
   
}
/*fbrequest delegate methods*/

- (void)requestLoading:(FBRequest *)request
{
    NSLog(@"request Loading:%@",request);
   
    v=[[UIView alloc] initWithFrame:CGRectMake(0, 0, 480, 320)];
    v.backgroundColor=[UIColor colorWithRed:.05 green:0.7 blue:2.5 alpha:1.0];
    [self.view addSubview:v];
   
    UIImageView *BackImage=[[[UIImageView alloc] init]autorelease];
    BackImage.image=[UIImage imageNamed:@"Facebook-Wallpaper.jpeg"];
    BackImage.frame=CGRectMake(0, 0, 480, 320);
    [v addSubview:BackImage];
   
    UploadCancel=[[UIButton alloc]init];
    UploadCancel=[UIButton buttonWithType:UIButtonTypeCustom];
    UploadCancel.backgroundColor=[UIColor colorWithRed:0.0 green:0.0 blue:0.5 alpha:0.6];
    UploadCancel.frame=CGRectMake(160, 220, 150, 40);
    [UploadCancel setTitle:@"Cancel Upload" forState:UIControlStateNormal];
    [UploadCancel addTarget:self action:@selector(CancelUpload) forControlEvents:UIControlEventTouchUpInside];
    //  [but setImage:[UIImage imageNamed:@"blue.png"] forState:UIControlStateNormal];

    prog=[[UIProgressView alloc]initWithProgressViewStyle:UIProgressViewStyleBar];
    prog.frame=CGRectMake(110, 120, 250, 30);
    [v addSubview:prog];
}
- (void)request:(FBRequest *)request didReceiveResponse:(NSURLResponse *)response
{
    NSLog(@"recieved response:%@",response);
    [v removeFromSuperview];
    v = nil;
}
- (void)request:(FBRequest *)request didFailWithError:(NSError *)error
{
    [v addSubview:UploadCancel];
    UIAlertView *alertV=[[UIAlertView alloc] initWithTitle:@"Connection Error" message:@"Check Ur Internet Connections" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
    [alertV show]; 
}

-(void)CancelUpload
{
    //  prog.progress=(float)nil;
    [v removeFromSuperview];
    v=nil;
    UIAlertView *alertV=[[UIAlertView alloc] initWithTitle:@"UPload Cancelled" message:@"Due to Bad Internet Connections" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
    [alertV show];
}

- (void)request:(FBRequest *)request didLoad:(id)result
{
        NSLog(@"Successfully uplaoded :%@",result);
}
- (void)request:(FBRequest *)request didLoadRawResponse:(NSData *)data
{
   
}

- (void)request:(FBRequest *)request didSendBodyData:(NSInteger)bytesWritten totalBytesWritten:(NSInteger)totalBytesWritten totalBytesExpectedToWrite:(NSInteger)totalBytesExpectedToWrite
{
    NSLog(@"%f",(float)totalBytesWritten/totalBytesExpectedToWrite);
    prog.progress=(float)totalBytesWritten/totalBytesExpectedToWrite;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return UIInterfaceOrientationIsLandscape(interfaceOrientation);
}

@end

CLick & build .

when u use to upload any of the content.it just uplaods the content toi FB as shown in console.

How To add MultiLingual Concept to Iphone(xcode) App.

To Add ,

Firstly Create a string File from >>>>>

Right click on Project name in xcode Groups&panels.

select add new file->ios->resource->string file->add any name as your wish.say(localizable)

After creating a file, select dat  that file and go to utilities tab .

under utilities->show file inspector menu->localization->click + button select required language as many as u like .say(english,italian etc)

Those languages adds to your file 'localizable'.

Till here creating string file was done perfectly.

Next,If your app display's some strings to user/interactions.write that all strings in 'localizable.strings' file as mentioned above.

Go to localizable file -> open localizable.strings (italian)->

Write your required string as follow


"Settings"="Impostazioni";
"Wow"="Wow";
etc......


Everything Now Done:)))))

Close Your App.Go to Settings Menu..General->internation->language->italiano->done

Now Build & run Your App:)


Happy Iphone!!!!! bye:)