NSArray in a Label - iphone

I would like to display the contents of the NSMutable array in a label.
I have the following code that displays only the last object. What would be the method to display ALL the objects in the array (in this case "values")?
self.lblMessage.text = [NSString stringWithFormat:#"%#\n%#",
self.lblMessage.text, [values objectAtIndex:[values count]-1]];


Following code should do what you need:
label.numberOfLines = 0; // to make sure your label is able to display multiple lines
label.text = [values componentsJoinedByString:#"\n"]; //insert separator symbol you need in place of "\n"


To get all values in an NSArray joined by a delimiter like ", " use [values componentsJoinedByString:#", "]. The delimiter can of course be "\n" if you like, but you need to make sure your label or textfield supports multiple lines.
Also, your [values objectAtIndex:[values count]-1] can be better expressed as [values lastObject]. :)


Normally a label is only to show one line of text. And you use \n in your code. So there are multiple lines. Delete The \n in your code or try tu use a UITextView. ;-)
There's also a way to force UILabel to display multiple lines, but I don't know that one on the go...

Related

How to use regular expression in iPhone app to separate string by , (comma)

I have to read .csv file which has three columns. While parsing the .csv file, I get the string in this format Christopher Bass,\"Cry the Beloved Country Final Essay\",cbass#cgs.k12.va.us. I want to store the values of three columns in an Array, so I used componentSeparatedByString:#"," method! It is successfully returning me the array with three components:
Christopher Bass
Cry the Beloved Country Final Essay
cbass#cgs.k12.va.us
but when there is already a comma in the column value, like this
Christopher Bass,\"Cry, the Beloved Country Final Essay\",cbass#cgs.k12.va.us
it separates the string in four components because there is a ,(comma) after the Cry:
Christopher Bass
Cry
the Beloved Country Final Essay
cbass#cgs.k12.va.us
so, How can I handle this by using regular expression. I have "RegexKitLite" classes but which regular expression should I use. Please help!
Thanks-

Any regular expression would probably turn out with the same problem, what you need is to sanitize your entries or strings, either by escaping your commas or by highlighting strings this way: "My string". Otherwise you will have the same problem. Good luck.
For your example you would probably need to do something like:
\"Christopher Bass\",\"Cry\, the Beloved Country Final Essay\",\"cbass#cgs.k12.va.us\"
That way you could use a regexp or even the same method from the NSString class.
Not related at all, but the importance of sanitizing strings: http://xkcd.com/327/ hehehe.

How about this:
componentsSeparatedByRegex:#",\\\"|\\\","
This should split your string whereever " and , appear together in either order, resulting in a three-member array. This of course assumes that the second element in the string is always enclosed in parentheses, and the characters " and , never appear consecutively within the three components.
If either of these assumptions is incorrect, other methods to identify string components may be used, but it should be made clear that no generic solution exists. If the three component strings can contain " and , anywhere, not even a limited solution is possible in such cases:
Doe, John,\"\"Why Unescaped Strings Suck\", And Other Development Horror Stories\",Doe, John <john.doe#dev.null>
Hopefully there is nothing like the above in your CSV data. If there is, the data is basically unusable, and you should look into a better CSV exporter.

The regex you're searching for is: \\"(.*)\\"[ ^,]*|([^,]*),
in ObjC: (('\"' && string_1 && '\"' && 0-n spaces) || string_2 except comma) && comma
NSString *str = #"Christopher Bass,\"Cry, the Beloved Country ,Final Essay\",cbass#cgs.k12.va.us,som";
NSString *regEx = #"\\\"(.*)\\\"[ ^,]*|([^,]*),";
NSMutableArray *split = [[str componentsSeparatedByRegex:regEx] mutableCopy];
[split removeObject:#""]; // because it will print always both groups even if the other is empty
NSLog(#"%#", split);
// OUTPUT:
2012-02-07 17:42:18.778 tmpapp[92170:c03] (
"Christopher Bass",
"Cry, the Beloved Country ,Final Essay",
"cbass#cgs.k12.va.us",
som
)
RegexKitLite will add both strings to the array, therefore you will end up with empty objects for your array. removeObject:#"" will delete those but if you need to maintain true empty values (eg. your source has val,,ue) you have to modify the code to the following:
str = [str stringByReplacingOccurrencesOfRegex:regEx withString:#"$1$2∏"];
NSArray *split = [str componentsSeparatedByString:#"∏"];
$1 and $2 are those two strings mentioned above, ∏ is in this case a character which will most likely never appear in normal text (and is easy to remember: option-shift-p).

The last part looks like it will never contain a comma. Neither will the first one as far as I can see...
What about splitting the string like this:
NSArray *splitArr = [str componentsSeparatedByString:#","];
NSString *nameStr = [splitArr objectAtIndex:0];
NSString *emailStr = [splitArr lastObject];
NSString *contentStr = #"";
for(int i=1; i<[splitArr count]-1; ++i) {
contentStr = [contentStr stringByAppendingString:[splitArr objectAtIndex:i]];
}
This will use the first and last string as is, and combine the rest into the content.
Kind of a hack, but a name and an email address will never contain a comma, right?

Is the title guarantied to have the quotation marks? And is it the only component that can have them? Because then componentSeparatedByString:#"\"" should get you this:
Christopher Bass,
Cry, the Beloved Country Final Essay
,cbass#cgs.k12.va.us
Then use componentSeparatedByString:#"," or substringFrom/ToIndex: to get rid of the two commas in the first and last component.
Here's a solution using substring:
NSString* input = #"Christopher Bass,\"Cry, the Beloved Country Final Essay\",cbass#cgs.k12.va.us";
NSArray* split = [input componentsSeparatedByString:#"\""];
NSString* part1 = [split objectAtIndex:0];
NSString* part2 = [split objectAtIndex:1];
NSString* part3 = [split objectAtIndex:2];
part1 = [part1 substringToIndex:[part1 length] - 1];
part3 = [part3 substringFromIndex:1];
NSLog(part1);
NSLog(part2);
NSLog(part3);

Copying an array to a string and displaying the string in order

I am copying an NSMutableArray to a string. When I am displaying the string I am getting a "(" sign before the array items and the array entries are separated by a comma in between. I want to display the array entries line by line, and not by comma separated. How can I do this

There are a number of ways to do this. If you just want to join the array with a new-line character, the easiest is to use NSArray's -componentsJoinedByString: method. For example, to do exactly what you asked:
NSArray* myArray = // assume this exists
NSString* stringJoinedByNewLines = [myArray componentsJoinedByString:#"\n"];
// This should show each of the elements separated by a new-line (and they are now in a single string)
NSLog(#"the string: %#", stringJoinedByNewLines);

NSMutableArray * items = someArray;
NSMutableString * bulletList = [NSMutableString stringWithCapacity:items.count*10];
for (NSString * s in items)
{
[bulletList appendFormat:#"%#\n", s];
}
yourTextView.text = bulletList;

You can try
NSString*str=[str1 stringByReplacingOccurrencesOfString:#"(" withString:#"\n"];
This will replace all the opening braces with a new line character.Do the same for closing brace.

text file question

I have text file that with the following structure:
test\n
1\n
2\n
#/#/#/\n
test2 \n
223\n
44\n
#/#/#/\n
I can read it in array successfuly , but the line #/#/#/ is separator. I want to divide the NSArray to sub arrays at the separator.
Any suggestion how to solve that?
I also need to modify certain section.
Best regards

If you read it in as a NSString then
NSArray *chunks = [string componentsSeparatedByString: #"#/#/#/"];

Use componentsSeparatedByString method.You can store the value obtained in an Array.

How can I create a string from just the first line of my UITextView?

I am making a UITextView which is similar to notes.app, where the first line of the textView is used as the title. I need to create a new string which contains only the first line of text. So far I've come up with this:
NSRange startRange = NSMakeRange(0, 1);
NSRange titleRange = [noteTextView.text lineRangeForRange:startRange];
NSString *titleString = [noteTextView.text substringToIndex:titleRange.length];
NSLog(#"The title is: %#", titleString);
The only problem with this is that it relies on the user pressing Return. I've also tried using a loop to find the number of characters in the first line:
CGSize lineSize = [noteTextView.text sizeWithFont:noteTextView.font
constrainedToSize:noteTextView.frame.size
lineBreakMode:UILineBreakModeWordWrap];
int textLength =1;
while ((lineSize.width < noteTextView.frame.size.width) &&
([[noteTextView.text substringToIndex:textLength] length] < [noteTextView.text length]))
{
lineSize = [[noteTextView.text substringToIndex:textLength] sizeWithFont:noteTextView.font
constrainedToSize:noteTextView.frame.size
lineBreakMode:UILineBreakModeWordWrap];
textLength = textLength+1;
}
NSLog(#"Length is %i", textLength);
But I've got this wrong somewhere - it returns the total number of characters, instead of the number on the first line.
Does anyone know an easier/better way of doing this?

There is probably a much better way with CoreText, but I'll throw this out there just because it came to mind off the top of my head.
You could add characters one by one to an NSMutableString *title while
[title sizeWithFont:noteTextView.font].width < noteTextView.frame.size.width
then drop the last one, obviously doing the necessary bounds checking along the way and dropping the last added character if necessary.
But sizeWithFont is sloooooow. So if you're doing this often you might want to consider another definition of 'title' - say, at first word break after 20 chars.
But again, CoreText might yield more possibilities.

I do not understand the code you're having above. Wouldn't it be simpler do just find the first line of text in the string, e.g. until a CR or LF terminates the first line?
And if there is no CR or LF, then you take the entire text as you have only one line then.
Of course, this will give you not what is visible in the first line in case the line is longer and gets wrapped, but I think that using lineRangeForRange doesn't do this, either, or does it?
And if your only concern is that "the user has to press enter" to make it work, then why not simply append a newline char to the text before testing for the first line's length?

See how many characters can fit in one line of your text view and use that number in a substringToIndex: method. Like this:
Type out the same character repeatedly and count how many fit in one line. Make sure to use a wide letter to ensure reliability. Use a capital g or m or q or w or whatever is widest in the font you're using.
Say 20 characters can fit in one line.
Then do
NSString *textViewString = notesTextView.text;
NSString *titleString = [textViewString substringToIndex:20]
Just use the titleString as the title.

Find words with regEx and then add whitespaces inbetween with Objective-c

I was wondering how to add whitespaces inbetween letters/numbers in a string with Objective-C.
I have the sample code kinda working at the moment. Basically I want to turn "West4thStreet" into "West 4th Street".
NSString *myText2 = #"West4thStreet";
NSString *regexString2 = #"([a-z.-][^a-z .-])";
for(NSString *match2 in [myText2 componentsMatchedByRegex:regexString2 capture:1L]) {
NSString *myString = [myText2 stringByReplacingOccurrencesOfString:match2 withString:#" "];
NSLog(#"Prints out: %#",myString); // Prints out: Wes thStreet // Prints out: West4t treet
}
So in this example, it's replacing what I found in regEx (the "t4" and "hS") with spaces. But I just want to add a space inbetween the letters to separate out the words.
Thanks!

If you wrap parts of your regex patterns in parentheses, you can refer to them as $1, $2, etc in your replacement string (patterns are numbered from left to right, by the order of their opening parenthesis).
NSString *origString = #"West4thStreet";
NSString *newString = [origString stringByReplacingOccurrencesOfRegex:#"(4th)" withString:#" $1 "];
Not sure I understand your broader use case, but that should at least get you going...