CODEWITHSUNDEEP
iosobjective-cuilabelnsdateupdates
Sameer Khira
Sameer Khira

Reputation: 71

Change date in UILabel when click next and previous UIButton

Set a date in UILabel. The click on "next" and "previous" buttons should change date inside this label.

I'm trying this code but next button click and show date next day date for e.g 01/05/2015 and previous button click and set date 29/05/2015 and next button click not display 02/05/2015

- (IBAction)changeToNextDay:(id)sender
{
    NSDateComponents* deltaComps = [[NSDateComponents alloc] init];
    [deltaComps setDay:+1];
    NSDate* tomorrow = [[NSCalendar currentCalendar]  dateByAddingComponents:deltaComps toDate:[NSDate date] options:0];

    NSDateFormatter *myDateFormatter = [[NSDateFormatter alloc] init];
    [myDateFormatter setDateFormat:@"dd-MM-yyyy"];

    NSString *stringFromDate = [myDateFormatter  stringFromDate:tomorrow];
    dateLabel.text = stringFromDate;
}

- (IBAction)changeToPreviousDay:(id)sender
{
    NSDate *datePlusOneDay = [[NSDate date] dateByAddingTimeInterval:-(60 * 60 * 24)];
    NSLog(@"datePlusOneDay=%@",datePlusOneDay);

    NSDateFormatter *myDateFormatter = [[NSDateFormatter alloc] init];
    [myDateFormatter setDateFormat:@"dd-MM-yyyy"];

    NSString *stringFromDate = [myDateFormatter stringFromDate:datePlusOneDay];
    dateLabel.text = stringFromDate;
}

Upvotes: 1

Views: 1069

Answers (3)

Chirag D jinjuwadiya
Chirag D jinjuwadiya

Reputation: 643

- (void)viewDidLoad {
    [super viewDidLoad];
    [self Update_Date_By:0];
}

- (IBAction)changeToNextDay:(id)sender {
    [self Update_Date_By:1];
}

- (IBAction)changeToPreviousDay:(id)sender {
    [self Update_Date_By:-1];
}

-(void)Update_Date_By:(NSInteger)value {
    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
    [dateFormat setDateFormat:@"dd/MM/yyyy"];
    NSDate *date = [dateFormat dateFromString:dateLabel.text];
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *dateComponents = [NSDateComponents new];
    dateComponents.day = value;
    if (value == 0) {
        date = [NSDate date];
    }
    NSDate *newDate = [calendar dateByAddingComponents:dateComponents toDate:date options:0];
    [dateFormat setDateFormat:@"dd/MM/yyyy"];
    NSString *finalDate_String = [dateFormat stringFromDate:newDate];
    dateLabel.text = finalDate_String;
}

Upvotes: 6

Amir Khan
Amir Khan

Reputation: 1318

You can implement this in a simple way.Follow the steps-

  1. Declare two global variables for formatting and incrementing or decrementing the date.Such as-

    #import "ViewController.h"

    @interface ViewController ()
    {

    NSDateFormatter *DateFormatter;
int day;

    }

    @end

  2. In viewDidLoad,define the format of the date,set the current date in UILabel and initialize the day variable to 0-

    day=0;
DateFormatter=[[NSDateFormatter alloc] init];
[DateFormatter setDateFormat:@"dd/MM/yyyy"];
dateLabel.text=[DateFormatter stringFromDate:[NSDate date]];

  3. For going to the next day Write the code in the body of the 'changeToNextDay' button-

    NSDate *now = [NSDate date];
day+=1;
NSDateComponents *components =[[NSDateComponents alloc] init];
[components setDay:day];
 NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];  
 NSDate *newDate = [gregorian dateByAddingComponents:components toDate:now options:0];
 dateLabel.text=[DateFormatter stringFromDate:newDate];

  4. For going to the previous day just copy the code from 'changeToNextDay' and paste it in 'changeToPreviousDay' button and change the line-

     day-=1 from day+=1;

Let me know if it works for you.Thank you.

Upvotes: 1

vijeesh
vijeesh

Reputation: 1327

Function for Previous Day 

-(void)previousDay
{
  NSDate *today = [NSDate date];
    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
    [dateFormat setDateFormat:@"dd/MM/yyyy"];
    dateString = [dateFormat stringFromDate:today];


    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *comps = [NSDateComponents new];
    comps.day =-1;
    NSDate *previousDay = [calendar dateByAddingComponents:comps toDate:[NSDate date] options:0];
    [dateFormat setDateFormat:@"dd/MM/yyyy"];
    resultDate = [dateFormat stringFromDate:previousDay];

}

function for next day

-(void)nextDay
{
  NSDate *today = [NSDate date];
    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
    [dateFormat setDateFormat:@"dd/MM/yyyy"];
    dateString = [dateFormat stringFromDate:today];


    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *comps = [NSDateComponents new];
    comps.day =1;
    NSDate *nextDay = [calendar dateByAddingComponents:comps toDate:[NSDate date] options:0];
    [dateFormat setDateFormat:@"dd/MM/yyyy"];
    resultDate = [dateFormat stringFromDate:nextDay];;

}

you can use this function

Upvotes: 0

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