This question already has answers here:
Is there a simple way to split a NSString into an array of characters?
(4 answers)
Closed 6 years ago.
I am building a PygLatin App and would like to know how to split a string into a character array.
For example:
If the user inputs "hello world" I would want to be able to split hello into an array variable that stores it as [#"h",#"e",#"l",#"l",#"o"] so that I can compare it with the vowels array later.
Those functions must help you to do it.
NSString *str=#"hello world"; // your string
NSArray *items = [str componentsSeparatedByString:#" "]; //split string with separator
NSString *str1=[items objectAtIndex:0]; // get the first string
SString *str2=[items objectAtIndex:1];
for (int i=0; i < [str1 length]; i++) {
unichar mycharacter = [str1 characterAtIndex:0];
NSString * mycharasstring= [NSString stringWithFormat:#"%c", mycharacter];
[self.myarray addobject: [myString characterAtIndex:i]]; // add characters to your array
}
Related
This question already has answers here:
Is there a simple way to split a NSString into an array of characters?
(4 answers)
Closed 8 years ago.
I'm trying to split an NSString into multiple NSString's. One new string for every character in the NSString. Is there a simpler way to do this than just doing it manually? A method or API that can do this automatically?
For example, turn this string:
_line1 = [NSString stringWithFormat:#"start"];
into:
_string1 = [NSString stringWithFormat:#"s"];
_string2 = [NSString stringWithFormat:#"t"];
_string3 = [NSString stringWithFormat:#"a"];
_string4 = [NSString stringWithFormat:#"r"];
_string5 = [NSString stringWithFormat:#"t"];
The documentation out there is really good. There are lots of ways you could do this.
https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSString_Class/Reference/NSString.html
One way is to make an array of NSStrings that contain each character.
NSString * line1 = #"start";
NSMutableArray * characters = [NSMutableArray array];
for(int i = 0; i < line1.length; i++) {
NSString * character = [line1.substringWithRange:NSMakeRange(i, 1)];
[characters addObject:character];
}
// Then loop over characters array ...
First off, why are you using _line1? You should never access properties directly via their pointer. Please use self.line1 instead. I will assume you have #property NSString *line1; in your class definition. If not, you'll need to adjust the code I'm posting as necessary.
Second, no there's no way built in. But it's pretty simple to do manually:
NSMutableArray *chars = [NSMutableArray array];
NSUinteger i = 0;
for (i = 0; i < self.line1.length; i++) {
[chars addObject:[self.line1 substringWithRange:NSMakeRange(i, 1)]];
}
This question already has answers here:
Convert NSArray to NSString in Objective-C
(9 answers)
Closed 9 years ago.
I wish to know how to convert an NSArray (for example: ) into an Objective-C string (NSString).
Also, how do I concatenate two strings together? So, in PHP it's:
$variable1 = "string one":
$variable2 = $variable1;
But I need it in Objective-C
Possible duplication: Convert NSArray to NSString in Objective-C
Firstly, that is not PHP concatenation, This is:
$variable1 = "Hello":
$variable1 .= "World";
see: https://stackoverflow.com/a/11441389/1255945
Next, Stackoverflow isnt a personal tutor. You should only post here specific problems and provide as much code and information as you can, not just stuff thats basically saying "I cant be bothered to look myself, tell me".
I must admit I have done this myself so i'm not having a go at you, just trying to be polite as share my knowledge and experience
With that in mind, to convert an NSArray to NSString
Taken from: http://ios-blog.co.uk/tutorials/objective-c-strings-a-guide-for-beginners/
NSString * resultString = [[array valueForKey:#"description"] componentsJoinedByString:#""];
If you want to split the string into an array use a method called componentsSeparatedByString to achieve this:
NSString *yourString = #"This is a test string";
NSArray *yourWords = [myString componentsSeparatedByString:#" "];
// yourWords is now: [#"This", #"is", #"a", #"test", #"string"]
if you need to split on a set of several different characters, use NSString’s componentsSeparatedByCharactersInSet:
NSString *yourString = #"Foo-bar/iOS-Blog";
NSArray *yourWords = [myString componentsSeparatedByCharactersInSet:
[NSCharacterSet characterSetWithCharactersInString:#"-/"]
];
// yourWords is now: [#"Foo", #"bar", #"iOS", #"Blog"]
Note however that the separator string can’t be blank. If you need to separate a string into its individual characters, just loop through the length of the string and convert each char into a new string:
NSMutableArray *characters = [[NSMutableArray alloc] initWithCapacity:[myString length]];
for (int i=0; i < [myString length]; i++) {
NSString *ichar = [NSString stringWithFormat:#"%c", [myString characterAtIndex:i]];
[characters addObject:ichar];
}
Hope this helps, and Good luck developing :)
I have a string I need to split. It would be easy using componentsSeparatedByString but my problem is that the separator is a comma but I could have commas that aren't separator.
I explain:
My string:
NSString *str = #"black,red, blue,yellow";
the comma between red and blue must not be considered as separator.
I can determine if comma is a separator or not checking if after it there is a white space.
The goal is to obtain an array with:
(
black,
"red, blue",
yellow
)
This is tricky. First replace all occurences of ', ' (comma+space) with say '|' then use components separated method. Once you are done, again replace '|' with ', ' (comma+space).
Just to complete the picture, a solution that uses a regular expression to directly identify commas not followed by white space, as you explain in your question.
As others have suggested, use this pattern to substitute with a temporary separator string and split by that.
NSString *pattern = #",(?!\\s)"; // Match a comma not followed by white space.
NSString *tempSeparator = #"SomeTempSeparatorString"; // You can also just use "|", as long as you are sure it is not in your input.
// Now replace the single commas but not the ones you want to keep
NSString *cleanedStr = [str stringByReplacingOccurrencesOfString: pattern
withString: tempSeparator
options: NSRegularExpressionSearch
range: NSMakeRange(0, str.length)];
// Now all that is needed is to split the string
NSArray *result = [cleanedStr componentsSeparatedByString: tempSeparator];
If you are not familiar with the regex pattern used, the (?!\\s) is a negative lookahead, which you can find explained quite well, for instance here.
Here is coding implementation for cronyneaus4u's solution:
NSString *str = #"black,red, blue,yellow";
str = [str stringByReplacingOccurrencesOfString:#", " withString:#"|"];
NSArray *wordArray = [str componentsSeparatedByString:#","];
NSMutableArray *finalArray = [NSMutableArray array];
for (NSString *str in wordArray)
{
str = [str stringByReplacingOccurrencesOfString:#"|" withString:#", "];
[finalArray addObject:str];
}
NSLog(#"finalArray = %#", finalArray);
NSString *str = #"black,red, blue,yellow";
NSArray *array = [str componentsSeparatedByString:#","];
NSMutableArray *finalArray = [[NSMutableArray alloc] init];
for (int i=0; i < [array count]; i++) {
NSString *str1 = [array objectAtIndex:i];
if ([[str1 substringToIndex:1] isEqualToString:#" "]) {
NSString *str2 = [finalArray objectAtIndex:(i-1)];
str2 = [NSString stringWithFormat:#"%#,%#",str2,str1];
[finalArray replaceObjectAtIndex:(i-1) withObject:str2];
}
else {
[finalArray addObject:str1];
}
}
NSLog(#"final array count : %d description : %#",[finalArray count],[finalArray description]);
Output:
final array count : 3 description : (
black,
"red, blue",
yellow
)
I'am trying to seperate a string with danish characters into a NSMutableArray. But something is not working. :(
My code:
NSString *danishString = #"æøå";
NSMutableArray *characters = [[NSMutableArray alloc] initWithCapacity:[danishString length]];
for (int i=0; i < [danishString length]; i++)
{
NSString *ichar = [NSString stringWithFormat:#"%c", [danishString characterAtIndex:i ]];
[characters addObject:ichar];
}
If I do at NSLog on the danishString it works (returns æøå);
But if I do a NSLog on the characters (the array) I get some very stange characters - What is wrong?
/Morten
First of all, your code is incorrect. characterAtIndex returns unichar, so you should use #"%C"(uppercase) as the format specifier.
Even with the correct format specifier, your code is unsafe, and strictly speaking, still incorrect, because not all unicode characters can be represented by a single unichar. You should always handle unicode strings per substring:
It's common to think of a string as a sequence of characters, but when
working with NSString objects, or with Unicode strings in general, in
most cases it is better to deal with substrings rather than with
individual characters. The reason for this is that what the user
perceives as a character in text may in many cases be represented by
multiple characters in the string.
You should definitely read String Programming Guide.
Finally, the correct code for you:
NSString *danishString = #"æøå";
NSMutableArray *characters = [[NSMutableArray alloc] initWithCapacity:[danishString length]];
[danishString enumerateSubstringsInRange:NSMakeRange(0, danishString.length) options:NSStringEnumerationByComposedCharacterSequences usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {
[characters addObject:substring];
}];
If with NSLog(#"%#", characters); you see "strange character" of the form "\Uxxxx", that's correct. It's the default stringification behavior of NSArray by description method. You can print these unicode characters one by one if you want to see the "normal characters":
for (NSString *c in characters) {
NSLog(#"%#", c);
}
In your example, ichar isn't type of NSString, but unichar. If you want NSStrings try getting a substring instead :
NSString *danishString = #"æøå";
NSMutableArray *characters = [[NSMutableArray alloc] initWithCapacity:[danishString length]];
for (int i=0; i < [danishString length]; i++)
{
NSRange r = NSMakeRange(i, 1);
NSString *ichar = [danishString substringWithRange:r];
[characters addObject:ichar];
}
You could do something like the following, which should be fine with Danish characters, but would break down if you have decomposed characters. I suggest reading the String Programming Guide for more information.
NSString *danishString = #"æøå";
NSMutableArray* characters = [NSMutableArray array];
for( int i = 0; i < [danishString length]; i++ ) {
NSString* subchar = [danishString substringWithRange:NSMakeRange(i, 1)];
if( subchar ) [characters addObject:subchar];
}
That would split the string into an array of individual characters, assuming that all the code points were composed characters.
It is printing the unicode of the characters. Anyhow, you can use the unicode (with \u) anywhere.
I think I am getting a little confused here, what I have is a plain text file with the numbers "5 10 2350" in it. As you can see below I am trying to read the first value using readDataOfLength, I think maybe where I am getting muddled is that I should be reading as chars, but then 10 is 2 chars and 2350 is 4. Can anyone point m in the right direction to reading these.
NSString *dataFile_IN = #"/Users/FGX/Documents/Xcode/syntax_FileIO/inData.txt";
NSFileHandle *inFile;
NSData *readBuffer;
int intBuffer;
int bufferSize = sizeof(int);
inFile = [NSFileHandle fileHandleForReadingAtPath:dataFile_IN];
if(inFile != nil) {
readBuffer = [inFile readDataOfLength:bufferSize];
[readBuffer getBytes: &intBuffer length: bufferSize];
NSLog(#"BUFFER: %d", intBuffer);
[inFile closeFile];
}
EDIT_001
Both excellent answers from Jarret and Ole, here is what I have gone with. One final question "METHOD 02" picks up a carriage return to a blank line at the bottom of the text file, returns it as a subString, which in turn gets converted to "0" can I set the NSCharacterSet to stop that, currently I just added a length check on the string.
NSInteger intFromFile;
NSScanner *scanner;
NSArray *subStrings;
NSString *eachString;
// METHOD 01 Output: 57 58 59
strBuffer = [NSString stringWithContentsOfFile:dataFile_IN encoding:NSUTF8StringEncoding error:&fileError];
scanner = [NSScanner scannerWithString:strBuffer];
while ([scanner scanInteger:&intFromFile]) NSLog(#"%d", intFromFile);
// METHOD 02 Output: 57 58 59 0
strBuffer = [NSString stringWithContentsOfFile:dataFile_IN encoding:NSUTF8StringEncoding error:&fileError];
subStrings = [strBuffer componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
for(eachString in subStrings) {
if ([eachString length] != 0) {
NSLog(#"{%#} %d", eachString, [eachString intValue]);
}
}
gary
There are several conveniences in Cocoa that can make your life a bit easier here:
NSString *dataFile_IN = #"/Users/FGX/Documents/Xcode/syntax_FileIO/inData.txt";
// Read all the data at once into a string... an convenience around the
// need the open a file handle and convert NSData
NSString *s = [NSString stringWithContentsOfFile:dataFile_IN
encoding:NSUTF8StringEncoding
error:nil];
// Use a scanner to loop over the file. This assumes there is nothing in
// the file but integers separated by whitespace and newlines
NSInteger anInteger;
NSScanner *scanner = [NSScanner scannerWithString:s];
while (![scanner isAtEnd]) {
if ([scanner scanInteger:&anInteger]) {
NSLog(#"Found an integer: %d", anInteger);
}
}
Otherwise, using your original approach, you'd pretty much have to read character-by-character, adding each character to a "buffer" and then evaluating your integer when you encounter a space (or newline, or some other separator).
If you read the file's contents into a string as Jaret suggested, and assuming the string only contains numbers and whitespace, you can also call:
NSArray *substrings = [s componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
This will split the string at whitespace and newline characters and return an array of the substrings. You would then have to convert the substrings to integers by looping over the array and calling [substring integerValue].
One way to do it would be first to first turn your readBuffer into a string as follows:
NSString * dataString = [[NSString alloc] initWithData:readBuffer encoding:NSUTF8StringEncoding];
Then split the string into values:
NSString *dataString=#"5 10 2350"; // example string to split
NSArray * valueStrings = [dataString componentsSeparatedByString:#" "];
for(NSString *valueString in valueStrings)
{
int value=[valueString intValue];
NSLog(#"%d",value);
}
Output of this is
5
10
2350