sorting string Array

Question

I have a txt file (string) with elements separated with ";". I an reading this into an MSMutable array. I need to sort on the field following the date. It will be integer data. How do I grab this field out of the string in order to sort it. I have searched for days and cannot find a reference to this.

2012/09/17;5;-54.74 2012/09/17;76;6.53 2012/09/17;66;6.53 2012/09/17;69;6.53 2012/09/17;60;6.53 2012/09/17;96;6.53 2012/09/17;86;6.53 2012/09/17;77;6.53

Thanks,

Ron

Sergey Kalinichenko · Accepted Answer · 2012-09-19 21:43:46Z

1

You can use the sortUsingComparator: method, like this:

[array sortUsingComparator: ^(id lhs, id rhs) {
    // Get the string between the first and the second semicolons:
    NSString *obj1 = [[lhs componentsSeparatedByString:@";"] objectAtIndex:1];
    NSString *obj2 = [[rhs componentsSeparatedByString:@";"] objectAtIndex:1];
    // Compare the two strings as integers:
    if ([obj1 integerValue] > [obj2 integerValue]) {
        return (NSComparisonResult)NSOrderedDescending;
    }
    if ([obj1 integerValue] < [obj2 integerValue]) {
        return (NSComparisonResult)NSOrderedAscending;
    }
    return (NSComparisonResult)NSOrderedSame;
}];

answered Sep 19, 2012 at 21:43

Sergey Kalinichenko

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3 Comments

Ron Bledsoe Over a year ago

Thanks, I am new at this. Let me give it a try

Ron Bledsoe Over a year ago

This works great but how do i sort on the date field. I cannot get it to select a date object

Sergey Kalinichenko Over a year ago

@RonBledsoe objectAtIndex:0 will give you the date string. Parse it (link) and compare them for sorting.

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