Design and develop a Single View iPhone application in Objective-C that allows t

Question

Design and develop a Single View iPhone application in Objective-C that allows the user to enter a set of integers separated by commas, sorts them, and shows the sorted integers separated by commas Example Input: 22,10,345,45,58 Output: 10,22,45,58,345 allows the user to enter a set of strings separated by commas, sorts them alphabetically, and shows the sorted strings separated by commas Example: Input: csci,swen,cinf,acct Output: acct,cinf,csci,swen * allows the user to enter a set of dates (mm/dd/yyyy format) separated by commas, sorts them in chronological order, and shows the sorted dates separated by commas Example: Input: 09/13/2015,08/15/2016,24/01/2003 Output: 24/01/2003,09/13/2015,08/15/2016 Hints You can use a text view to allow the user to enter the input text, and you can use another text view in read-only (i.e. non-editable) mode to show the output text You can use a segment control (or other similar UI controls) to allow the user to choose between integer/string/date modes for input text

Explanation / Answer

Answer:

The followig code describes the use of NSmutable array,NSstring,NSnumber and how to store the inputs and sort them and display sorted list.

UITextField *input0;

UITextField *input1;   

UITextField *input2;

UITextField *input3;

UITextField *input4;

NSMutableArray *textinputs = [@[input0, input1, input2,input3,input4] mutableCopy];

NSNumberFormatter *Nf = [[NSNumberFormatter alloc] init];

formatter.numberStyle = NSNumberFormatterDecimalStyle;

[textFields sortedUsingComparator: ^(id inp1, id inp2) {

     NSString *textinput1 = ((UITextField *)inp1).text;

     NSString *textinput1 = ((UITextField *)inp2).text;

     NSNumber *inputunumber1 = [Nf numberFromString:textinput1];

     NSNumber *inputnumber2 = [Nf numberFromString:textinput2];

     return [inputnumber1 compare:inputnumber2];

}];

NSLog(@"The sorted list of inputs : %@", textinputs);

We can use different code blocks for sorting different kinds of inputs

For sorting dates :

NSArray *unsortedarr = [dataToDb allkeys];

NSArray *keys = [unsortedarr sortedArrayUsingComparator:^NSComparisonResult(id inp1, id inp2) {

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

        [dformatter setDateFormat:@"mm-dd-yyyy"];

        NSDate *date1 = [dformatter dateFromString:(NSString*) inp1];

        NSDate *date2 = [dformatter dateFromString:(NSString*) inp2];

        return [date1 compare: date2];

    }];

Assuming that the dictionary contains all dates and allkeys return the unsorted dictionary keys

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