Scroll UITextField above Keyboard in a UITableView OR UIScrollView

-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
    CGPoint pointInTable = [textField.superview convertPoint:textField.frame.origin toView:TableName];
    CGPoint contentOffset = TableName.contentOffset;
 
    contentOffset.y = (pointInTable.y - textField.inputAccessoryView.frame.size.height);
 
    NSLog(@"contentOffset is: %@", NSStringFromCGPoint(contentOffset));  
    [TableName setContentOffset:contentOffset animated:YES];  
    return YES;
}


-(BOOL)textFieldShouldEndEditing:(UITextField *)textField
{
    [textField resignFirstResponder];  
    if ([textField.superview.superview isKindOfClass:[UITableViewCell class]])
    {
        CGPoint buttonPosition = [textField convertPoint:CGPointZero
                                                  toView: TableName];
        NSIndexPath *indexPath = [TableName indexPathForRowAtPoint:buttonPosition];
     
        [TableName scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionMiddle animated:TRUE];
    }
 
    return YES;
}

(OR)

- (void)textFieldDidBeginEditing:(UITextField *)textField {

    CGPoint pointInTable = [textField.superview convertPoint:textField.frame.origin toView:scheduleTableView];

    CGPoint contentOffset = scheduleTableView.contentOffset;

    

    contentOffset.y = (pointInTable.y - textField.inputAccessoryView.frame.size.height);

    [scheduleTableView setContentOffset:contentOffset animated:YES];

}

- (void)textFieldDidEndEditing:(UITextField *)textField {

    [textField resignFirstResponder];

    if ([textField.superview.superview isKindOfClass:[UITableViewCell class]])

    {

        CGPoint buttonPosition = [textField convertPoint:CGPointZero

                                                  toView: scheduleTableView];

        NSIndexPath *indexPath = [scheduleTableView indexPathForRowAtPoint:buttonPosition];

        

        [scheduleTableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionMiddle animated:YES];

    }

    

}

Send Synchronous Request

Post Method:

.h file: 

@property(nonatomic,assign) NSMutableData *receivedData;

.m file:

 receivedData = [NSMutableData data];

NSError *error;

        NSMutableString *post = [NSMutableString stringWithFormat:@"foodid=%@",food_id];

        NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];

        NSString *postLength = [NSString stringWithFormat:@"%lu", (unsigned long)[postData length]];

        NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"%@/DeleteFood.php",kBaseURL]];

        NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url

                                                               cachePolicy:NSURLRequestReloadIgnoringLocalCacheData

                                                           timeoutInterval:10.0];

        [request setHTTPMethod:@"POST"];

        [request setValue:postLength forHTTPHeaderField:@"Content-Length"];

        [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];

        [request setHTTPBody:postData];

        

        NSURLResponse *requestResponse;

        NSData *requestHandler = [NSURLConnection sendSynchronousRequest:request returningResponse:&requestResponse error:&error];

        

        NSString *requestReply = [[NSString alloc] initWithBytes:[requestHandler bytes] length:[requestHandler length] encoding:NSASCIIStringEncoding];

   

//retrieve response:

     

        if(!error)

        {        //log response

            NSLog(@"Response from server = %@", requestReply);

            [self foodretrieve];

        }else{

            [foodTable reloadData];

        }

// (OR) retrieve json format: 

   [receivedData appendBytes:[requestReply UTF8String]

                       length:[requestReply lengthOfBytesUsingEncoding:NSUTF8StringEncoding]];

    id jsonObjects = [NSJSONSerialization JSONObjectWithData:receivedData options:NSJSONReadingMutableContainers error:nil];

Get Method:

NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"%@/DeleteFood.php?foodid=%@",kBaseURL,food_id]];

        NSURLRequest *request = [NSURLRequest requestWithURL:url];

        

        NSURLResponse *response;

        NSError *error;

        //send it synchronous

        NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];

        NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding]; 

     if(!error)

        {        //log response

            NSLog(@"Response from server = %@", responseString);

            [self foodretrieve];

        }else{

            [foodTable reloadData];

        }

UISegmentedControl using Two UITableView on UINavigationController bar title

@property (nonatomic, retain, readwrite) UISegmentedControl * segmentedControl;

-(void)viewWillAppear:(BOOL)animated

{

    [[self navigationController] setNavigationBarHidden:NO animated:NO];

    [super viewWillAppear:animated];

    

    NSArray * segmentItems = [NSArray arrayWithObjects: @"First", @"Second", nil];

    self.segmentedControl = [[[UISegmentedControl alloc] initWithItems: segmentItems] retain];

    self.segmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;

    self.segmentedControl.selectedSegmentIndex = 0;

    [self.segmentedControl addTarget: self action: @selector(onSegmentedControlChanged:) forControlEvents: UIControlEventValueChanged];

    self.navigationItem.titleView = segmentedControl;

}

- (void) onSegmentedControlChanged:(UISegmentedControl *) sender {

    if (self.segmentedControl.selectedSegmentIndex == 0) {

        rsvpinvitationTable.hidden = YES;

        rsvpTable.hidden = NO;

    }else{

        rsvpTable.hidden = YES;

        rsvpinvitationTable.hidden = NO;

    }

}

uitableview border layer

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath

{

    

    if ([cell respondsToSelector:@selector(setSeparatorInset:)]) {

        [cell setSeparatorInset:UIEdgeInsetsZero];

    }

    

    if ([cell respondsToSelector:@selector(setLayoutMargins:)]) {

        [cell setLayoutMargins:UIEdgeInsetsZero];

    }

    

    if (expansesArray.count != 0) {

    NSUInteger rowsCount = [self tableView:tableView numberOfRowsInSection:indexPath.section];

    NSUInteger heightvalue = (rowsCount * 63)+ 40; // 40 header height, 63 cell height

        CAGradientLayer *gradient = [CAGradientLayer layer];

        gradient.frame = CGRectMake(0, 0, 300, heightvalue);

        gradient.borderWidth = 1.0f;

        gradient.cornerRadius = 5.0f;

        gradient.borderColor = [[UIColor orangeColor]CGColor];

        [expensesTable.layer addSublayer:gradient];

    }

}

First letter alphabet only and string is alphabet and numeric with limit in UITextField.

#define ALPHA @"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz "

#define NUMERIC @"1234567890"

#define ALPHA_NUMERIC ALPHA NUMERIC

#define MAX_LENGTH 25

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string  {

     

     NSCharacterSet *myCharSet = [[NSCharacterSet characterSetWithCharactersInString:@"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"] invertedSet];

     

     NSString* newStr = [itemname.text stringByTrimmingCharactersInSet:myCharSet];

     if ([newStr length] < 1)

     {

         unichar c =  [string characterAtIndex:0];;

         if ([myCharSet characterIsMember:c]) {

             return NO;

         }

     }else{

     

     NSUInteger newLength = [itemname.text length] + [string length] - range.length;

     

     NSCharacterSet *cs = [[NSCharacterSet characterSetWithCharactersInString:ALPHA_NUMERIC] invertedSet];

     

     NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];

     

     while (newLength < MAX_LENGTH) {

         return [string isEqualToString:filtered];

     }

     return (newLength > MAX_LENGTH) ? NO : YES;

     }

    return YES;

    

}

Delay AND Sleep

Delay:

 [self performSelector:@selector(pushView) withObject:nil afterDelay:1.0];

- (void) pushView {

        [self.navigationController popViewControllerAnimated:YES];

}

Sleep:

sleep(1);

Perform action after time while user is interacting:

double delayInSeconds = 2.0;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
    <#code to be executed on the main queue after delay#>

});

eg:

-(void)aMethod:(UIButton *)sender{

NSLog(@"Before");

    double delayInSeconds = 2.0;

    dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));

    dispatch_after(popTime, dispatch_get_main_queue(), ^(void){

NSLog(@"after 2");

      });

}

Date format validation

 NSString *avliable_date = [NSString stringWithFormat:@"Mar 20, 2015"];

NSDateFormatter *df = [[NSDateFormatter alloc] init];

            [df setDateFormat:@"MMM dd, yyyy"];

            NSDate *date = [df dateFromString:avliable_date];

            BOOL isDate = [date isKindOfClass: [NSDate class]];

            if (isDate) {

                NSLog(@"valid");

            }else{

                NSLog(@"not valid");

            }

Email pdf format using tableview

.h file:

#import <MessageUI/MessageUI.h>

@interface ViewController : UIViewController<MFMailComposeViewControllerDelegate>

.m file:

@interface ViewController ()

{    

    NSMutableArray *totalDisplayObject;    

    NSString *Expensereport, *emailbody;

    MFMailComposeViewController *mc;

}

-(IBAction)sendmail:(id)sender{

[expansesTable reloadData];

        

        NSDate *today = [NSDate date];

        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

        [dateFormatter setDateFormat:@"MM/dd/yyyy"];

        NSString *dateString = [dateFormatter stringFromDate:today];

        

        Expensereport = [NSString stringWithFormat:@"Expense report for %@ - %@", self.sEventName,dateString];

        emailbody = [NSString stringWithFormat:@"Dear %@ %@, \n\n Attached to this mail is the expense report for %@ as per %@.", self.sFname,self.sLname,self.sEventName,dateString];

        

        CGRect frame = self.expansesTable.frame;

        frame.size.height = self.expansesTable.contentSize.height;

        self.expansesTable.frame = frame;

        

        UIGraphicsBeginImageContextWithOptions(self.expansesTable.bounds.size, self.expansesTable.opaque, 0.0);

        [self.expansesTable.layer renderInContext:UIGraphicsGetCurrentContext()];

        UIImage *saveImage = UIGraphicsGetImageFromCurrentImageContext();

        

        UIGraphicsEndImageContext();

        imageData = UIImagePNGRepresentation(saveImage);

        

        UIImage *image = [UIImage imageWithData:imageData];

        UIImageView *imageView = [[UIImageView alloc]initWithImage:image];

        

        [self createPDFfromUIView:imageView saveToDocumentsWithFileName:@"Expenses.pdf"];

        

        mc = [[MFMailComposeViewController alloc] init];

        if ([MFMailComposeViewController canSendMail]) {

            mc.mailComposeDelegate = self;

            [mc setSubject:Expensereport];

            [mc setMessageBody:emailbody isHTML:NO];

            

            UIImage *image1 = [UIImage imageWithData:imageData];

            UIImageView *imageView1 = [[UIImageView alloc]initWithImage:image1];

            

            NSMutableData *pdfData = [self createPDFfromUIView:imageView1 saveToDocumentsWithFileName:@"Expenses.pdf"];

            // Attach an image to the email

            [mc addAttachmentData:pdfData mimeType:@"application/pdf" fileName:@"Expenses.pdf"];

            // Present mail view controller on screen

            [self presentViewController:mc animated:YES completion:NULL];

        }

}

- (void) mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error

{

    switch (result)

    {

        case MFMailComposeResultCancelled:

            NSLog(@"Mail cancelled");

            break;

        case MFMailComposeResultSaved:

            NSLog(@"Mail saved");

            break;

        case MFMailComposeResultSent:

            NSLog(@"Mail sent");

            break;

        case MFMailComposeResultFailed:

            NSLog(@"Mail sent failure: %@", [error localizedDescription]);

            break;

        default:

            break;

    }

    [self dismissViewControllerAnimated:YES completion:NULL];

    [expansesTable reloadData];

}

Email .csv(excel format):

.h file:

#import <MessageUI/MessageUI.h>

@interface ViewController : UIViewController<MFMailComposeViewControllerDelegate>

.m file:

@interface ViewController ()

{    

    NSMutableArray * expansesArray;

    NSString *Expensereport, *emailbody;

    MFMailComposeViewController *mc;

}

-(IBAction)sendmail:(id)sender{

    

    Expensereport = [NSString stringWithFormat:@"Expense report for"];

    emailbody = [NSString stringWithFormat:@"Dear, \n\n Attached to this mail is the expense report for as per ."];

    /* ================= CSV FILE ================*/

    

 NSMutableString *csv;

        csv = [NSMutableString stringWithString:@" , , "];

        

        [csv appendFormat:@"\n\"%@\",%@,\"%@\"",[NSString stringWithFormat:@"NAME"],[NSString stringWithFormat:@"%@ %@",self.sFname,self.sLname],@""];

        

        [csv appendFormat:@"\n\"%@\",%@,\"%@\"",[NSString stringWithFormat:@"AMOUNT"],[NSString stringWithFormat:@"%@ %.2f",BudgetLabel.text,person_amt],@""];

        

        [csv appendFormat:@"\n\"%@\",%@,\"%@\"",[NSString stringWithFormat:@"AVERAGE"],[NSString stringWithFormat:@"%@ %.2f",BudgetLabel.text,(Tot_exp / Tot_per)],@""];

        

       [csv appendFormat:@"\n"];

        

        [csv appendFormat:@"\n\"%@\",%@,\"%@\"",@"Item name",@"Date",@"Amount"];

        

        [csv appendFormat:@"\n"];

               

        NSUInteger count = [expansesArray count];

        // provided all arrays are of the same length

        for (NSUInteger i=0; i<count; i++ ) {

            

            NSDictionary *tmpDict = [expansesArray objectAtIndex:i];

            

            NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

            [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

            NSDate *date1 = [dateFormatter dateFromString: [tmpDict objectForKey:datetime_exp]];

            dateFormatter = [[NSDateFormatter alloc] init] ;

            [dateFormatter setDateFormat:@"dd-MMM-yyyy"];

            NSString *DateString = [dateFormatter stringFromDate:date1];

            

            [csv appendFormat:@"\n\"%@\",%@,\"%f\"",

             [tmpDict objectForKey:item_name],

             DateString,

             [[tmpDict objectForKey:expenses_amount] floatValue]

             ];

        }

        

        NSArray *sysPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory ,NSUserDomainMask, YES);

        NSString *docPath = [sysPaths objectAtIndex:0];

        NSString *surveys = [docPath stringByAppendingPathComponent:@"expense.csv"];

        NSError *error;

        BOOL res = [csv writeToFile:surveys atomically:YES encoding:NSUTF8StringEncoding error:&error];

        if (!res) {

            NSLog(@"Error %@ while writing to file %@", [error localizedDescription], surveys );

        }        

        

        mc = [[MFMailComposeViewController alloc] init];

        if ([MFMailComposeViewController canSendMail]) {

            mc.mailComposeDelegate = self;

            [mc setSubject:Expensereport];

            [mc setMessageBody:emailbody isHTML:NO];

            

            [mc addAttachmentData:[NSData dataWithContentsOfFile:surveys]

                         mimeType:@"text/csv"

                         fileName:@"expense.csv"];

            // Present mail view controller on screen

            [self presentViewController:mc animated:YES completion:NULL];

        }

}

- (void) mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error

{

    switch (result)

    {

        case MFMailComposeResultCancelled:

            NSLog(@"Mail cancelled");

            break;

        case MFMailComposeResultSaved:

            NSLog(@"Mail saved");

            break;

        case MFMailComposeResultSent:

            NSLog(@"Mail sent");

            break;

        case MFMailComposeResultFailed:

            NSLog(@"Mail sent failure: %@", [error localizedDescription]);

            break;

        default:

            break;

    }

    

    [self dismissViewControllerAnimated:YES completion:NULL];

}

iOS sorting array of dictionaries by key

Json: (

        {

        "eef_name" = "Viswa Bell";

        "eua_address" = "Chennai, Tamil Nadu, India";

        "eua_id" = 8;

        "eua_mobile_no" = 9600089555;

    },

        {

        "eef_name" = "Hiramani Barman";

        "eua_address" = "Alwarpet, Chennai, tamilnadu, india";

        "eua_id" = 117;

        "eua_mobile_no" = 9840504444;

    },

        {

        "eef_name" = "Arvind Kumar";

        "eua_address" = "Chennai, Tamilnadu - 18, India";

        "eua_id" = 1;

        "eua_mobile_no" = 9952800777;

    },

        {

        "eef_name" = "Bindu ";

        "eua_address" = Chennai;

        "eua_id" = 71;

        "eua_mobile_no" = 8678902999;

    }

)

NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"eef_name" ascending:YES];

            NSArray *sortDescriptors = [NSArray arrayWithObject:sortDescriptor];

            NSArray *sortedArray = [mymutablearray sortedArrayUsingDescriptors:sortDescriptors];

           mymutablearray = [NSMutableArray arrayWithArray:sortedArray];