-[__NSCFString objectForKey:]: unrecognized selector sent to instance in Objective C

Question

I am new in iOS and I am facing problem regarding to show data from web service to calendar.

My code is like this

-(void)funAddEvents:(NSArray *)arrDate
{   
    _eventsByDate = [NSMutableDictionary new];


    for(int i=0;i<arrDate.count;i++)
    {

        NSString *datefromweb= [NSString stringWithFormat: @"%@",[[arrDate objectAtIndex:i] objectForKey:@"Date"]]; //Showing error on this like..
        NSDateFormatter* df = [[NSDateFormatter alloc] init];
        [df setDateFormat:@"MM/dd/yyyy hh:mm:ss a"];
        NSDate *randomDate = [[NSDate alloc] init];
        randomDate = [df dateFromString:datefromweb];

        NSString *key = [[self dateFormatter] stringFromDate:randomDate];
        //  NSLog(@"event date =%@",randomDate);

        if(!_eventsByDate[key])
        {
            _eventsByDate[key] = [NSMutableArray new];
        }

        [_eventsByDate[key] addObject:randomDate];
        // NSLog(@"afte event date %@",eventsByDate);
    }

}

Thanks in Advance!

`[arrDate objectAtIndex:i]` is a `NSString` object, not a `NSDictionary` object. Guessing? `NSString *datefromweb = [arrDate objectAtIndex:i];`. — Larme, Mar 31 '17 at 09:33
@Larme I write code like this NSString *datefromweb = [arrDate objectAtIndex:i]; and it shows error setObjectForKey: key cannot be nil' — Muju, Mar 31 '17 at 09:37
What error? Please, be clear. Give us the value of `arrDate` Or at least `[arrDate objectAtIndex:i]` It's unclear, what is your issue. My guess with your new error? The date format doesn't match? Is it because randomDate is nil? Which line? — Larme, Mar 31 '17 at 09:39
Now your issue is about the `dateFormat` of your `NSDateFormatter`. In which world `MM/dd/yyyy hh:mm:ss a` matches `2017/03/27`? When you do `[df dateFromString:datefromweb]` that's where lies your issue. Try with `yyyy/MM/dd` instead. — Larme, Mar 31 '17 at 09:42

Nirav D · Accepted Answer · 2017-03-31T09:43:58.690

1

arrDate is Array of String not Array of Dictionary also you are getting nil because of wrong dateFormat. Correct dateFormat for your string is yyyy/MM/dd and currently you are setting dateFormat to MM/dd/yyyy hh:mm:ss a which is wrong, so changing dateFormat will solved your problem.

for(int i=0;i<arrDate.count;i++)
{

    NSString *datefromweb= [NSString stringWithFormat: @"%@",[[arrDate objectAtIndex:i] objectForKey:@"Date"]]; //Showing error on this like..
    NSDateFormatter* df = [[NSDateFormatter alloc] init];
    [df setDateFormat:@"yyyy/MM/dd"];
    NSDate *randomDate = [[NSDate alloc] init];
    randomDate = [df dateFromString:datefromweb];

    NSString *key = [[self dateFormatter] stringFromDate:randomDate];
    //  NSLog(@"event date =%@",randomDate);

    if(!_eventsByDate[key])
    {
        _eventsByDate[key] = [NSMutableArray new];
    }

    [_eventsByDate[key] addObject:randomDate];
    // NSLog(@"afte event date %@",eventsByDate);
}

edited Mar 31 '17 at 09:43

answered Mar 31 '17 at 09:41

Nirav D

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Thank you very much it solve by changing date format. – Muju Mar 31 '17 at 09:43
@Muju Welcome mate :) – Nirav D Mar 31 '17 at 09:44
can you check this question http://stackoverflow.com/questions/43090242/how-to-show-3-events-on-same-date-on-calendar-from-web-service-in-objective-c – Muju Mar 31 '17 at 09:46
@Muju Let me check if I have solution I will post it – Nirav D Mar 31 '17 at 09:58
Can you please check this question http://stackoverflow.com/questions/43539307/how-to-post-string-with-special-character-and-thai-language-using-xml-parsing-in. – Muju Apr 22 '17 at 06:30
@Muju I have check your question not have solution for it – Nirav D Apr 22 '17 at 09:43
Not a problem I got solution. I just change code in unicoding. – Muju Apr 22 '17 at 09:53

-[__NSCFString objectForKey:]: unrecognized selector sent to instance in Objective C

1 Answers1