I have an NSString that contains a users full name. Some names are in the standard first and last formation (Kyle Begeman) and others are just a single name (TechCrunch).
How would I grab the first name as is and then the first initial of the last name, and if there is only one name, just grab the whole name?
Basically I want the above to be turned into Kyle B. or just TechCrunch depending on the name.
NSString *username = #"Kyle Begeman"
NSString *otherUserName = #"TechCrunch"
converted to
#"Kyle B"
// No conversion because it is a single word name
#"TechCrunch"
Using substringToIndex is how I can grab the first letter in the whole string, and I know there is a way to separate the string by #" " whitespace into an array but I can figure out how to easily produce the result the way it needs to be.
Any help would be great!
(NSString*)firstNameWithInitial:(NSString*)userName {
NSArray *array = [userName componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
array = [array filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:#"SELF != ''"]];
NSString *firstName = [array objectAtIndex:0];
NSString finalNameString;
if ([array count] > 1) {
NSString *lastNameInitial = [[array objectAtIndex:1] substringToIndex:1];
finalNameString = [firstName stringByAppendingString:[NSString stringWithFormat:#" %#", lastNameInitial]];
else {
finalNameString = firstName;
}
return finalNameString;
}
This function should return what you need. Note that you can modify this to work with people who have more than 2 names, by checking the number of objects in the array.
Find a position pos of the first space in the string. If there is no space, or if the space is the last character of the string, then return the entire string; otherwise, return substring in the range from zero to pos+1, inclusive:
NSRange range = [str rangeOfString:#" "];
if (range.location == NSNotFound || range.location == str.length-1) {
return str;
} else {
return [str substringToIndex:range.location+1];
}
You could use NSScanner to find substrings.
NSString *name = #"Some name";
NSString *firstName;
NSString *lastName;
NSScanner *scanner = [NSScanner scannerWithString:name];
[scanner scanUpToString:#" " intoString:&firstName]; // Scan all characters up to the first space
[scanner scanUpToString:#"" intoString:&lastName]; // Scan remaining characters
if (lastName != nil) {
// It was no space and lastName is empty
} else {
// There was at least one space and lastName contains a string
}
Related
I have an example NSString in iOS
NSString* str = #"-- This is an example string";
I want to get the first alphabet letter. The result of above situation is letter "T" from word "This". Some characters before letter "T" is not alphabet letter so it returns the first alphabet letter is "T".
How can I retrieve it? If the string not contain any alphabet letter, it can return nil.
Besides, the result can be a NSRange
NSRange range = [string rangeOfCharacterFromSet:[NSCharacterSet letterCharacterSet]];
First create a NSCharecterSet as a global variable and write this code
-(void)viewDidLoad{
NSCharacterSet *s = [NSCharacterSet characterSetWithCharactersInString:#"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"]
s = [s invertedSet];
NSString *myString = #"--- This is a string";
NSArray *arrayOfStrings = [myString componentsSeparatedByString:#" "];
for(int i=0;i<arrayOfStrings.count){
NSString *current = [arrayOfStrings objectAtIndex:i];
char c = [self returnCharacter:current];
if(c == nil){
//that means first word is not with alphabets;
}
else {
NSLog(#"%c",c);
//your output.
}
}
}
And here is the method
-(char)returnChracter:(NSString*)string{
NSRange r = [string rangeOfCharacterFromSet:s];
if (r.location != NSNotFound) {
NSLog(#"the string contains illegal characters");
return nil;
}
else {
//string contains all alphabets
char firstLetter = [string charAtIndex:0];
return firstLetter;
}
}
You can use the following function. Pass a string and get first character as a string.
-(NSString*)getFirstCharacter:(NSString*)string
{
for(int i=0;i<string.length;i++)
{
unichar firstChar = [string characterAtIndex:i];
NSCharacterSet *letters = [NSCharacterSet letterCharacterSet];
if ([letters characterIsMember:firstChar]) {
return [NSString:stringWithFormat:#"%c",firstChar];
}
}
return nil;
}
I have a name textfield in my app, where both the firstname maybe a middle and a lastname is written. Now I want to split these components by the first whitespace, the space between the firstname and the middlename/lastname, so I can put it into my model.
For example:
Textfield Text: John D. Sowers
String 1: John
String 2: D. Sowers.
I have tried using [[self componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceCharacterSet]] firstObject]; & [[self componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceCharacterSet]] lastObject];
But these only work if have a name without a middlename. Since it gets the first and the last object, and the middlename is ignored.
So how would I manage to accomplish what I want?
/*fullNameString is an NSString*/
NSRange rangeOfSpace = [fullNameString rangeOfString:#" "];
NSString *first = rangeOfSpace.location == NSNotFound ? fullNameString : [fullNameString substringToIndex:rangeOfSpace.location];
NSString *last = rangeOfSpace.location == NSNotFound ? nil :[fullNameString substringFromIndex:rangeOfSpace.location + 1];
...the conditional assignment (rangeOfSpace.location == NSNotFound ? <<default value>> : <<real first/last name>>) protects against an index out of bounds error.
Well that method is giving you an array with all the words split by white space, so then you can grab the first object as the first name and the rest of the objects as middle/last/etc
NSArray *ar = [self componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
NSString *firstName = [ar firstObject];
NSMutableString *rest = [[NSMutableString alloc] init];
for(int i = 1; i < ar.count; i++)
{
[rest appendString:[ar objectAtIndex:i]];
[rest appendString:#" "];
}
//now first name has the first name
//rest has the rest
There might be easier way to do this, but this is one way..
Hope it helps
Daniel
I think this example below I did, solves your problem.
Remember you can assign values from the array directly, without transforming into string.
Here is an example:
NSString *textField = #"John D. Sowers";
NSArray *fullName = [textField componentsSeparatedByCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:#" "]];
if (fullName.count)
{
if (fullName.count > 2)
{
NSLog(#"Array has more than 2 objects");
NSString *name = fullName[0];
NSLog(#"Name:%#",name);
NSString *middleName = fullName[1];
NSLog(#"Middle Name:%#",middleName);
NSString *lastName = fullName[2];
NSLog(#"Last Name:%#",lastName);
}
else if(fullName.count == 2)
{
NSLog(#"Array has 2 objects");
NSString *name = fullName[0];
NSLog(#"Name:%#",name);
NSString *lastName = fullName[1];
NSLog(#"Last Name:%#",lastName);
}
else
{
NSString *name = fullName[0];
}
}
I found this to be most robust:
NSString *fullNameString = #"\n Barnaby Marmaduke \n \n Aloysius ";
NSMutableArray *nameArray = [[fullNameString componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] mutableCopy];
[nameArray removeObject:#""];
NSString *firstName = [nameArray firstObject];
if(nameArray.count)
{
[nameArray removeObjectAtIndex:0];
}
NSString *nameRemainder = [nameArray componentsJoinedByString:#" "];
Bob's your uncle.
I'm trying to write a string to a text file. That text file will then be read by another program. That second program is expecting the different "fields" in the text file to be a fixed width. Therefore, when I write the text file with my app, I will need to add spaces between my actual data to get everything to line up correctly. How do I get these spaces added?
So far, I've tried writing a function that takes a source string and a target length as input. If the target is longer than the source, it just appends " ". Code for this routine is below:
- (NSString *) makeStringFrom:(NSString *)source withLength:(NSInteger)length
{
// Method to add spaces to the end of a string to get it to a certain length
if ([source length] > length)
{
// String is too long - throw warning and send it back
NSLog(#"Warning - string is already longer than length supplied. Returning source string");
return source;
}
else if ([source length] == length)
{
// String is already correct length, so just send it back
return source;
}
else
{
// String is too short, need to add spaces
NSMutableString *newString = [[NSMutableString alloc] initWithString:source];
NSLog(#"newString initial length = %d",[newString length]);
for (int current = [source length]; current < length; current ++)
{
[newString stringByAppendingString:#" "];
NSLog(#"hit");
}
NSLog(#"target length = %d. newString length = %d",length,[newString length]);
return newString;
}
}
This apparently doesn't work. The length of the string I'm getting back in the return isn't changing any from the length of the supplied string, even when the NSLog(#"hit"); runs multiple times.
There's a stringByPaddingToLength:withString:startingAtIndex: method on NSString that does just this.
You did a silly mistake here
[newString stringByAppendingString:#" "];
This returns a new string, and it doesnot effect the caller object. You need to store it
newString=[newString stringByAppendingString:#" "];
or simply
[newString appendString:#" "];
You want to change:
[newString stringByAppendingString:#" "];
into:
newString = [newString stringByAppendingString:#" "];
I have a string Hello-World-Test, I want to split this string by the first dash only.
String 1:Hello
String 2:World-Test
What is the best way to do this? What I am doing right now is use componentsSeparatedByString, get the first object in the array and set it as String 1 then perform substring using the length of String 1 as the start index.
Thanks!
I added a category on NSString to split on the first occurrence of a given string. It may not be ideal to return the results in an array, but otherwise it seems fine. It just uses the NSString method rangeOfString:, which takes an NSString(B) and returns an NSRange showing where that string(B) is located.
#interface NSString (Split)
- (NSArray *)stringsBySplittingOnString:(NSString *)splitString;
#end
#implementation NSString (Split)
- (NSArray *)stringsBySplittingOnString:(NSString *)splitString
{
NSRange range = [self rangeOfString:splitString];
if (range.location == NSNotFound) {
return nil;
} else {
NSLog(#"%li",range.location);
NSLog(#"%li",range.length);
NSString *string1 = [self substringToIndex:range.location];
NSString *string2 = [self substringFromIndex:range.location+range.length];
NSLog(#"String1 = %#",string1);
NSLog(#"String2 = %#",string2);
return #[string1, string2];
}
}
#end
Use rangeOfString to find if split string exits and then use substringWithRange to create new string on bases of NSRange.
For Example :
NSString *strMain = #"Hello-World-Test";
NSRange match = [strMain rangeOfString:#"-"];
if(match.location != NSNotFound)
{
NSString *str1 = [strMain substringWithRange: NSMakeRange (0, match.location)];
NSLog(#"%#",str1);
NSString *str2 = [strMain substringWithRange: NSMakeRange (match.location+match.length,(strMain.length-match.location)-match.length)];
NSLog(#"%#",str2);
}
So my textfield has the following text. #"A big Tomato is red."
I want to get the word before "is".
When I type
NSString *someString = [[textfield componentsSeparatedByString:#"is"]objectAtIndex:0];
I always get "A big Tomato" instead of just "Tomato". In the app people will type things before "is" so I need to always get the string before "is". I would appreciate any help I can get. *Warning,
This is a very difficult problem.
Try this,
NSString *value = #"A big Tomato is red.";
NSArray *array = [value componentsSeparatedByString:#" "];
if ([array containsObject:#"is"]) {
NSInteger index = [array indexOfObject:#"is"];
if (index != 0) {
NSString *word = [array objectAtIndex:index - 1];
NSLog(#"%#", word);
}
}
Try this
NSString *string = #"A big Tomato is red.";
if ([string rangeOfString:#"is"].location == NSNotFound) {
NSLog(#"string does not contain is");
} else {
NSLog(#"string contains is!");
}
try this
NSString *str = #"A big tomato is red";
NSArray *arr = [str componentsSeparatedByString:#" "];
int index = [arr indexOfObject:#"is"];
if(index > 1)
NSString *str_tomato = arr[index-1];
else
//"is" is the first word of sentence
as per yvesleborg's comment