I am new to iphone.I have an array which contains the objects like below
"04_Num/04Num001.mp3",
"04_Num/04Num002.mp3",
"04_Num/04Num003.mp3",
"04_Num/04Num004.mp3",
"04_Num/04Num005.mp3",
"04_Num/04Num006.mp3",
"04_Num/04Num007.mp3",
"04_Num/04Num008.mp3",
"04_Num/04Num009.mp3",
"04_Num/04Num010.mp3",
"04_Num/04Num011.mp3",
"04_Num/04Num012.mp3",
"04_Num/04Num013.mp3",
"04_Num/04Num014.mp3",
"04_Num/04Num015.mp3",
"04_Num/04Num016.mp3",
"04_Num/04Num017.mp3",
"04_Num/04Num018.mp3",
"04_Num/04Num019.mp3",
"04_Num/04Num020.mp3",
"04_Num/04Num021.mp3",
"04_Num/04Num022.mp3",
"04_Num/04Num023.mp3",
"04_Num/04Num024.mp3",
"04_Num/04Num025.mp3",
"04_Num/04Num026.mp3",
"04_Num/04Num027.mp3",
"04_Num/04Num028.mp3",
"04_Num/04Num029.mp3",
"04_Num/04Num030.mp3",
"04_Num/04Num031.mp3",
"04_Num/04Num032.mp3",
"04_Num/04Num033.mp3",
"04_Num/04Num034.mp3",
"04_Num/04Num035.mp3",
"04_Num/04Num036.mp3"
but here i want retrieve the strings(objects)only after the / (i.e) for example 04_Num/04Num033.mp3 in this i want only the string 04Num033.mp3.Like this for all the above and then i have to place in an array
how it is possible if any body know this please help me...
lastPathComponent is what you need. You could do it like so:
NSMutableArray *files = [[NSMutableArray alloc] initWithCapacity:0];
for (NSString *file in songs) //Where songs is the array with the paths you have provided
{
[files addObject:[file lastPathComponent]];
}
You can separate the string into two parts using NSString's
componentsSeparatedByString:
method, and use the last string component
// Let's call your array of strings as stringsArray
NSMutableArray *prefixStrings = [[NSMutableArray alloc] init];
for (NSString *str in stringsArray) {
NSArray *stringComponents = [str componentsSeparatedByString:#"/"];
if ([stringComponents count]) {
[prefixStrings addObject:[stringComponents objectAtIndex:1]];
} }
Related
I am new to iphone.I have an array which contains the objects like below
"04_Num",
"04_Num/04Num.m3u",
"04_Num/04Num001.mp3",
"04_Num/04Num002.mp3",
"04_Num/04Num003.mp3",
"04_Num/04Num004.mp3",
"04_Num/04Num005.mp3",
"04_Num/04Num006.mp3",
"04_Num/04Num007.mp3",
"04_Num/04Num008.mp3",
"04_Num/04Num009.mp3",
"04_Num/04Num010.mp3",
"04_Num/04Num011.mp3",
"04_Num/04Num012.mp3",
"04_Num/04Num013.mp3",
"04_Num/04Num014.mp3",
"04_Num/04Num015.mp3",
"04_Num/04Num016.mp3",
"04_Num/04Num017.mp3",
"04_Num/04Num018.mp3",
"04_Num/04Num019.mp3",
"04_Num/04Num020.mp3",
"04_Num/04Num021.mp3",
"04_Num/04Num022.mp3",
"04_Num/04Num023.mp3",
"04_Num/04Num024.mp3",
"04_Num/04Num025.mp3",
"04_Num/04Num026.mp3",
"04_Num/04Num027.mp3",
"04_Num/04Num028.mp3",
"04_Num/04Num029.mp3",
"04_Num/04Num030.mp3",
"04_Num/04Num031.mp3",
"04_Num/04Num032.mp3",
"04_Num/04Num033.mp3",
"04_Num/04Num034.mp3",
"04_Num/04Num035.mp3",
"04_Num/04Num036.mp3"
but here i want the objects only which contains .mp3 extension and then i have to place those objects into another array
how it is possible if any body know this please help me...
You can iterate and get only the one that has .mp3
Like so
//yourArrayThatContainsAllStrings contains all the strings
NSMutableArray *arrayOfMp3 = [[NSMutableArray alloc] init];
for (NSString *str in yourArrayThatContainsAllStrings) {
if ([str rangeOfString:#".mp3"].location != NSNotFound) {
[arrayOfMp3 addObject:str];
}
}
//arrayOfMp3 will contain only the .mp3 files
NSMutableArray *mpthrees = [[NSMutableArray alloc] initWithCapacity:0];
for (NSString *file in songs) //Where songs is the array with the paths you have provided
{
BOOL isMpthree = [[file pathExtension] isEqualToString:#"mp3"];
if (isMpthree) [mpthrees addObject:file];
}
// Now mpthrees array holds only paths pointing to .mp3 files
// Let's call your array of strings as stringsArray
NSMutableArray *filteredArray = [[NSMutableArray alloc] init];
for (NSString *str in stringsArray) {
if ([str hasSuffix:#".mp3"]) {
[filteredArray addObject:str];
} }
//filteredArray will contain only the strings ending with ".mp3"
P.S. Since you're just beginning Objective C, i would like to reiterate that Objective C NSString objects always start with an # symbol. #"04_Num/04Num001.mp3"
I'm trying to do something like this ..
NSString *string = [NSString stringWithFormat:#"Hello World"];
NSArray *array = [NSArray arrayWithObject:string];
[uitextviewOutlet setText:[NSArray arrayWithArray:array]];
and I'd like for that to show up on my uitextviewOutlet window, which is an object of UITextView that will print out text.
The code works if I straight out send the uitextviewOutlet object the setText message and if it takes string as the parameter, but it won't take the array.
is there a way to have it take an array?
TIA.
You can join the elements with, let's say a comma like this: NSString *joinedString = [array1 componentsJoinedByString:#","];
Edit_: I'm not a friend of "Do it for me", but here you go:
NSString *string = [NSString stringWithFormat:#"Hello World"];
NSArray *array = [NSArray arrayWithObject:string];
[uitextviewOutlet setText:[array componentsJoinedByString:#","]];
By the way, your code makes no sense, or do you fill up the array with more than just one value?
You can convert an array to a string with -componentsJoinedByString: as in #BjörnKaiser`s example. Or for more flexibility you can do:
NSString *string = [NSString stringWithFormat:#"Hello World"];
NSArray *array = [NSArray arrayWithObject:string];
for (NSString *araryItem in array) {
[uitextviewOutlet replaceRange:NSMakeRange(uitextviewOutlet.text.length, 0) withText:#"foo\n"];
[uitextviewOutlet replaceRange:NSMakeRange(uitextviewOutlet.text.length, 0) withText:arrayItem];
}
I have and array of many strings.
I wan't to sort them into a dictionary, so all strings starting the same letter go into one array and then the array becomes the value for a key; the key would be the letter with which all the words in it's value's array begin.
Example
Key = "A" >> Value = "array = apple, animal, alphabet, abc ..."
Key = "B" >> Value = "array = bat, ball, banana ..."
How can I do that?
Thanks a lot in advance!
NSArray *list = [NSArray arrayWithObjects:#"apple, animal, bat, ball", nil];
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
for (NSString *word in list) {
NSString *firstLetter = [[word substringToIndex:1] uppercaseString];
NSMutableArray *letterList = [dict objectForKey:firstLetter];
if (!letterList) {
letterList = [NSMutableArray array];
[dict setObject:letterList forKey:firstLetter];
}
[letterList addObject:word];
}
NSLog(#"%#", dict);
You can achieve what you want through the following steps:
Create an empty but mutable dictionary.
Get the first character.
If a key for that character does not exist, create it.
Add the word to the value of the key (should be an NSMutableArray).
Repeat step #2 for all keys.
Here is the Objective-C code for these steps. Note that I am assuming that you want the keys to be case insensitive.
// create our dummy dataset
NSArray * wordArray = [NSArray arrayWithObjects:#"Apple",
#"Pickle", #"Monkey", #"Taco",
#"arsenal", #"punch", #"twitch",
#"mushy", nil];
// setup a dictionary
NSMutableDictionary * wordDictionary = [[NSMutableDictionary alloc] init];
for (NSString * word in wordArray) {
// remove uppercaseString if you wish to keys case sensitive.
NSString * letter = [[word substringWithRange:NSMakeRange(0, 1)] uppercaseString];
NSMutableArray * array = [wordDictionary objectForKey:letter];
if (!array) {
// the key doesn't exist, so we will create it.
[wordDictionary setObject:(array = [NSMutableArray array]) forKey:letter];
}
[array addObject:word];
}
NSLog(#"Word dictionary: %#", wordDictionary);
Take a look at this topic, they solves almost the same problem as you — filtering NSArray into a new NSArray in objective-c Let me know if it does not help so I will write for you one more code sample.
Use this to sort the contents of array in alphabetical order, further you design to the requirement
[keywordListArr sortUsingSelector:#selector(localizedCaseInsensitiveCompare:)];
I just wrote this sample. It looks simple and does what you need.
NSArray *names = [NSArray arrayWithObjects:#"Anna", #"Antony", #"Jack", #"John", #"Nikita", #"Mark", #"Matthew", nil];
NSString *alphabet = #"ABCDEFGHIJKLMNOPQRSTUWXYZ";
NSMutableDictionary *sortedNames = [NSMutableDictionary dictionary];
for(int characterIndex = 0; characterIndex < 25; characterIndex++) {
NSString *alphabetCharacter = [alphabet substringWithRange:NSMakeRange(characterIndex, 1)];
NSArray *filteredNames = [names filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:#"SELF BEGINSWITH[C] %#", alphabetCharacter]];
[sortedNames setObject:filteredNames forKey:alphabetCharacter];
}
//Just for testing purposes let's take a look into our sorted data
for(NSString *key in sortedNames) {
for(NSString *value in [sortedNames valueForKey:key]) {
NSLog(#"%#:%#", key, value);
}
}
i have to create an 2images and 3 labels by using code (cgrectmake)and i am having X location, y location, width and height all are stored in arrays(which i have retrieved from the web services)how can i create the image and labels can any one help me
You can join the elements of an array together with the NSString componentsJoinedByString class method:
NSString myString = [myNSArray componentsJoinedByString:#"x"];
where x is the characters you'd like to appear between each array element.
Edited to add
So in your newly-added code if these are the label values:
lbl = #"zero"
lbl1 = #"one"
lbl2 = #"two"
and you want to join them together with a space character then if you did this:
NSString *temp = [labelArray componentsJoinedByString:#" "];
NSLog(#"temp = %#", temp);
then this is what would be logged:
zero one two
Edited to further add
If you are instead trying to join the label values together to make xml elements then you might do something like this:
NSString *joinedElements = [labelArray componentsJoinedByString:#"</label><label>"];
NSString *temp = [NSString stringWithFormat:#"<label>%#</label>", joinedElements];
NSLog(#"temp = %#", temp);
then this is what would be logged:
<label>zero</label><label>one</label><label>two</label>
may be this is usefull to you.
NSString *str;
str = [arrayName objectAtIndex:i(Index NO)];
OK by this easily you can access object from the array. any type of object u can fetch this way only reception object type are change in left side.
Best of Luck.
Most objects have a -description method which returns a string representation of the object:
- (NSString *)description;
For example:
NSArray *array = [NSArray arrayWithObjects:#"The", #"quick", #"brown", #"fox", nil];
NSLog(#"%#", array); // prints the contents of the array out to the console.
NSString *arrayDescription = [array description]; // a string
It would help to know what you want to do with the string (how will you use the string). Also, what kind of objects do you have in the array?
In that case, Matthew's answer is one possibility. Another might be to use an NSMutableString and append the individual items, if you need control over how the string is created:
NSMutableString *string = [NSMutableString string];
if ([array count] >= 3) {
[string appendString:[array objectAtIndex:0]];
[string appendFormat:#"blah some filler text %#", [array objectAtIndex:1]];
[string appendString:[array objectAtIndex:2]];
}
i have the text in a string as shown below
011597464952,01521545545,454545474,454545444|Hello this is were the message is.
Basically i would like each of the numbers in different strings to the message eg
NSString *Number1 = 011597464952
NSString *Number2 = 01521545545
etc
etc
NSString *Message = Hello this is were the message is.
i would like to have that split out from one string that contains it all
I would use -[NSString componentsSeparatedByString]:
NSString *str = #"011597464952,01521545545,454545474,454545444|Hello this is were the message is.";
NSArray *firstSplit = [str componentsSeparatedByString:#"|"];
NSAssert(firstSplit.count == 2, #"Oops! Parsed string had more than one |, no message or no numbers.");
NSString *msg = [firstSplit lastObject];
NSArray *numbers = [[firstSplit objectAtIndex:0] componentsSepratedByString:#","];
// print out the numbers (as strings)
for(NSString *currentNumberString in numbers) {
NSLog(#"Number: %#", currentNumberString);
}
Look at NSString componentsSeparatedByString or one of the similar APIs.
If this is a known fixed set of results, you can then take the resulting array and use it something like:
NSString *number1 = [array objectAtIndex:0];
NSString *number2 = [array objectAtIndex:1];
...
If it is variable, look at the NSArray APIs and the objectEnumerator option.
NSMutableArray *strings = [[#"011597464952,01521545545,454545474,454545444|Hello this is were the message is." componentsSeparatedByCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:#",|"]] mutableCopy];
NString *message = [[strings lastObject] copy];
[strings removeLastObject];
// strings now contains just the number strings
// do what you need to do strings and message
....
[strings release];
[message release];
does objective-c have strtok()?
The strtok function splits a string into substrings based on a set of delimiters.
Each subsequent call gives the next substring.
substr = strtok(original, ",|");
while (substr!=NULL)
{
output[i++]=substr;
substr=strtok(NULL, ",|")
}
Here's a handy function I use:
///Return an ARRAY containing the exploded chunk of strings
///#author: khayrattee
///#uri: http://7php.com
+(NSArray*)explodeString:(NSString*)stringToBeExploded WithDelimiter:(NSString*)delimiter
{
return [stringToBeExploded componentsSeparatedByString: delimiter];
}