String Methods in iOS

• Appending a String
• String Padding
• Range of String 
• Substring with Range
• Components Separated by String
• Components Separated by Character in set
• Components joined by String
• String separated by comma (,)  added in array
• Substring from String
• Substring to Index
• String by replacing occurrences of String
• Case sensitive Comparison

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {

    @autoreleasepool {

        

        //Appending a String

        NSString *errortag=@ "Error: ";

        NSString *errorstring=@ "premature end of file";

        NSString *errormessage=[errortag stringByAppendingString:errorstring];

        NSLog(@ "%@",errormessage);

        

        //String Padding

        NSString *temp=@ "Akshay";

        temp= [temp stringByPaddingToLength:8 withString:@ "." startingAtIndex:0];

        NSLog(@ "%@",temp);

        //Error on setting the index to 1 when there is no space in the withString.

        

        temp=@ "Akshay";

        temp=[temp stringByPaddingToLength:10 withString:@ ". " startingAtIndex:1];

        NSLog(@ "%@",temp);

        

        //rangeOfString

        NSString *new=@ "Stefan";

        NSRange range=[new rangeOfString:@ "John"];

        NSLog(@ "Location : %lu Length: %lu",range.location,range.length);

        //Range starting from 0, doesn't make sense.

        

        //substringWithRange

        NSString *str=@ "DamonSalvetore";

        NSRange range1={0,6};

        NSString *str1=[str substringWithRange:range1];

        NSLog(@ "Substring with Range is %@",str1);

        NSString *str2=[str substringWithRange:NSMakeRange(5, 6)];

        NSLog(@ "Range is %@",str2.capitalizedString);

        

        //Components Seperate by String

        NSString *list=@ "Damon, Alina, Kathrine";

        NSArray *listitem= [list componentsSeparatedByString:@ ","];

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

            NSLog(@ "%@",[listitem objectAtIndex:i]);

        }

        

        //Components seperated by character in set

        NSString *st=@ "A~B~C~D~E";

        NSArray *starr=[st componentsSeparatedByCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@ "~"]];

        NSLog(@ "%@",starr);

        NSString *st1=@ "A~B^C~D^E";

        NSArray *starr1=[st1 componentsSeparatedByCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@ "^~"]];

        NSLog(@ "%@",starr1);

        

        //Components Joined by String

        NSArray *pathArray=[NSArray arrayWithObjects:@ "here",@ "dragons", @ "are", @ "stupid", nil];

        NSLog(@ "%@",[pathArray componentsJoinedByString:@ " "]);

        

        //String seperated by comma(,) added in array, and showed as desired output.

        NSString *gon=@ "Dragons,are,smart";

        NSArray *path=[gon componentsSeparatedByString:@ ","];

        NSLog(@ "%@",[path componentsJoinedByString:@ " "]);

        

        //substring from Index

        NSString *sub=@ "Elina";

        NSLog(@ "%@",[sub substringFromIndex:3]);

        

        //substring to Index

        NSLog(@ "%@",[sub substringToIndex:3]);

        NSString *output=[sub substringToIndex:3];

        NSLog(@ "%@",[output stringByPaddingToLength:6 withString:@ "." startingAtIndex:0]);

        

        //string by replacing occurences of string

        NSLog(@ "%@",[sub stringByReplacingOccurrencesOfString:@ "hay" withString:@ "Emi"]);

        

        //case insensitive Comparision

        NSLog(@ "Case Insensitive : %lu",[sub caseInsensitiveCompare:@ "aaksha"]);

        NSLog(@ "Case Sensitive %lu",[sub compare:@ "Akshay"]);

        

        //is equal to String (Returns BOOL i.e. 1 or 0 | YES or NO)

        NSLog(@ "Comparision returns Bool value : %d",[sub isEqualToString:@ "Akshay"]);

        

        //BOOL

        NSLog(@ "Prefix : %d",[sub hasPrefix:@ "Caroline"]);

        NSLog(@ "Suffix : %d",[sub hasSuffix:@ "caroline"]);

    }

    return 0;

}