I´m a beginer and have lately got a great deal of trouble with this issue.
I want to pass a NSDictnonary Data to a server from my app and in some cases if the user hasen´t chosen any option I want to remove nil objects.
I have looked into this thread that seems be the right method but I haven't succeed to implement in my code.
How to remove a null value from NSDictionary
My guess would be to implement the code to Null directly in my NSDictonary
Here´s my Dictionary code
-(NSDictionary*)parametersForCreateActivities
{
NSString *token = [[A0SimpleKeychain keychain] stringForKey:tokenConstant];
NSString *userId = [[A0SimpleKeychain keychain] stringForKey:child_id];
NSString *userCreate = [[NSUserDefaults standardUserDefaults] objectForKey:#"CreateTitle"];
NSString *createDescription = [[NSUserDefaults standardUserDefaults] objectForKey:#"DescriptionText"];
NSString *createTimestart = [[NSUserDefaults standardUserDefaults] objectForKey:#"TimeStartString"];
NSString *createTimestop = [[NSUserDefaults standardUserDefaults] objectForKey:#"TimeStopString"];
NSString *createImage = [[NSUserDefaults standardUserDefaults] objectForKey:#"DefaultcreateImageID"];
NSDictionary *parameters;
if (userId && token) {
parameters = #{child_id: userId, tokenConstant:token, activity_name :userCreate, create_Description :createDescription, create_Timestart :createTimestart, create_Timestop :createTimestop, create_Image :createImage};
}
return parameters;
}
My guess is that It should check somewhere in the code for nil objects and remove theme. But I have really struggled with figuring out how to format the code.
I´m guessing the code should be something like this but I have no idea where to place it and how to format it.
NSMutableDictionary *dict = [parametersForCreateActivities mutableCopy];
NSArray *keysForNullValues = [dict allKeysForObject:[NSNull null]];
[dict removeObjectsForKeys:DefaultcreateImageID];
Try below code
NSMutableDictionary *yourDictionary; // Your dictionary object with data
NSMutableDictionary *updatedDic = [yourDictionary mutableCopy];
for (NSString *key in [yourDictionary allKeys]) {
if ([yourDictionary[key] isEqual:[NSNull null]] || [yourDictionary[key] isKindOfClass:[NSNull class]]) {
updatedDic[key] = #"";
}
}
yourDictionary = [updatedDic copy];
NSLog(#"%#",yourDictionary);
I'm diving into iOS development and I have a custom URL scheme for my iPhone app that looks like myApp://?q=200. I have the following code to get the query parameter...
NSString *urlString = [url absoluteString];
NSString *query = [urlString stringByReplacingOccurrencesOfString:#"myApp://?q=" withString:#""];
...but I'd like to make it a bit more future-proof in the event that I add more parameters. How can I extract the "q" parameter in a safer way?
Thanks in advance for your wisdom!
You can split the query returned from the URL by & and = and put them in a dictionary.
NSURL *url = [NSURL URLWithString:#"myApp://?q=200"];
NSArray *query = [[url query] componentsSeparatedByString:#"&"];
NSMutableDictionary *parameters = [NSMutableDictionary dictionaryWithCapacity:[query count]];
for(NSString *parameter in query)
{
NSArray *kv = [parameter componentsSeparatedByString:#"="];
[parameters setObject:[kv count] > 1 ? [[kv objectAtIndex:1] stringByReplacingPercentEscapesUsingEncoding:NSISOLatin1StringEncoding] : [NSNull null]
forKey:[[kv objectAtIndex:0] stringByReplacingPercentEscapesUsingEncoding:NSISOLatin1StringEncoding]];
}
NSLog(#"Parameters: %#", parameters);
NSLog(#"q = %#", [parameters objectForKey:#"q"]);
In this example if there is no value for the parameter I just set it to NSNull. This means you would either need to check for NSNull or change the logic to skip keys with values or set them to an empty string.
This from the top of my head could work but doesnt yet include error checking the input
-(NSDictionary*) parameterDictionaryFromString: (NSURL*) url {
//input can be something like: "myApp://?q=one&q2=two&q3=three"
NSString *requestString = [url query];
//now we have q=one&q2=two&q3=three
NSArray *requests = [requestString componentsSeparatedByString: #"&"];
NSMutableDictionary *resultDictionary = [NSMutableDictionary dictionary];
for (NSString *singleParameter in requests) {
NSArray *keyValuePair = [singleParameter componentsSeparatedByString: #"="];
[resultDictionary setObject: [keyValuePair objectAtIndex: 1] forKey: [keyValuePair objectAtIndex: 0]];
}
NSURL *u = [NSURL URLWithString: #"myApp://something?q=1&check=yes"];
NSLog(#"paramStr = %#", [u parameterString]);
return [resultDictionary copy];
}
Break the Query String by Distinct Separator,
Assure Valued Content provided at index:1 (The right-hand side of the query string break)
In valued content then use downstream, or set to upstream variable.
//Your Example:
//#"myApp://?q=200"
//Break:
NSArray *queryParts = [urlString componentsSeparatedByString:#"?q="];
//Assure Content:
if ([[array objectAtIndex:1] length]>0) {
//Setter:
NSString *queryString = [array objectAtIndex:1];
//... Use away...
}
The key is to leverage the NSArray class over StringReplace.
This question is for manipulating NSString in xcode.
I have a XML text string that I get from the web that looks like this
<current temperature="73" day="Mon" humidity="59" windspeed="10"></current>
How can I get individual values from this string and put them in my NSString variables?
e.g.
NSString *tempStr = ??
NSString *dayStr = ??
NSString *windspeedStr = ??
First, download and include RaptureXML within your project as described on the RaptureXML project site.
For parsing the single given line, use the following snippet - your input is passed as inXmlString;
//transform string into an XML DOM
RXMLElement *rootNode = [RXMLElement elementFromXMLString:inXmlString
withEncoding:NSUTF8StringEncoding];
if (rootNode == nil || ![rootNode isValid])
{
//do something, we failed!
}
else
{
NSString *temperature = [rootNode attribute:#"temperature"];
NSString *day = [rootNode attribute:#"day"];
NSString *windspeed = [rootNode attribute:#"windspeed"];
}
The basic idea is to use the NSString method componentsSeparatedByString: to parse out the data you want. You'll probably need to do a bit more work to get it exactly right for your scenario.
NSArray* paArray1= [pstrXMLString componentsSeparatedByString:#" "];
temlStr= [[[paArray1 objectAtIndex:1] componentsSeparatedByString:#"="] objectAtIndex:1];
dayStr= [[[paArray1 objectAtIndex:2] componentsSeparatedByString:#"="] objectAtIndex:1];
windspeedStr= [[[paArray1 objectAtIndex:3] componentsSeparatedByString:#"="] objectAtIndex:1];
NSBundle *bundle = [NSBundle mainBundle];
NSString *pthpath = [bundle pathForResource:#"path" ofType:#"txt"];
NSString *content = [NSString stringWithContentsOfFile:pthpath encoding:NSUTF8StringEncoding error:nil];
array=[[NSArray alloc ]init];
array = [content componentsSeparatedByString:#"~"];
=====================================================================
here content is:
87,348~51,347~135,132~182,133~268,346~236,347~159,168~87,347#118,298~115,297~200,298~189,266~128,265~117,299#222,352~268,353~264,340~219,342~225,355#186,262~199,299~212,297~195,257~188,260
and array is:
"87,348",
"51,347",
"135,132",
"182,133",
"268,346",
"236,347",
"159,168",
"87,347#118,298",
"115,297",
"200,298",
"189,266",
"128,265",
"117,299#222,352",
"268,353",
"264,340",
"219,342",
"225,355#186,262",
"199,299",
"212,297",
"195,257",
"188,260"
But I want to again create an array by parsing with #. Please help me out...........
for (NSString *string in array) {
NSArray *subArray = [string componentsSeparatedByString:#"#"];
for (NSString *substring in subArray)
etc. etc.
(Next time try to have your question better formatted and articulated please.)
Instead of using componentsSeparatedByString:, use componentsSeparatedByCharactersInSet: and create a character set with the separators you want.
Also, you are creating an array there (array = [[NSArray alloc] init]) and when you do array = [content componentsSeparatedByString:#"#"] you are leaking the just allocated array. In general, seems like you should read more about how objects and references work.
I think from following code you may get some idea, if I understood your question correctly,
NSMutableArray *resultArray = [[NSMutableArray alloc] initWithCapacity:1];
NSArray *tempArray1 = nil;
NSArray *tempArray2 = nil;
NSString *content = #"87,348~51,347~135,132~182,133~268,346~236,347~159,168~87,347#118,298~115,297~200,298~189,266~128,265~117,299#222,352~268,353~264,340~219,342~225,355#186,262~199,299~212,297~195,257~188,260";
tempArray1 = [content componentsSeparatedByString:#"#"];
for(NSString *string in tempArray1)
{
tempArray2 = [string componentsSeparatedByString:#"~"];
[resultArray addObjectsFromArray:tempArray2];
}
NSLog(#"ResultArray :%#", resultArray);
I have an string which is got from parsing an xml site.
http://www.arijasoft.com/givemesomthing.php?a=3434&b=435edsf&c=500
I want to have an NSString function that will be able to parse the value of c.
Is there a default function or do i have to write it manually.
You could use Regular expression via RegExKit Lite:
http://regexkit.sourceforge.net/RegexKitLite/
Or you could separate the string into components (which is less nice):
NSString *url=#"http://www.arijasoft.com/givemesomthing.php?a=3434&b=435edsf&c=500";
NSArray *comp1 = [url componentsSeparatedByString:#"?"];
NSString *query = [comp1 lastObject];
NSArray *queryElements = [query componentsSeparatedByString:#"&"];
for (NSString *element in queryElements) {
NSArray *keyVal = [element componentsSeparatedByString:#"="];
if (keyVal.count > 0) {
NSString *variableKey = [keyVal objectAtIndex:0];
NSString *value = (keyVal.count == 2) ? [keyVal lastObject] : nil;
}
}
I made a class that does this parsing for you using an NSScanner, as an answer to the same question a few days ago. You might find it useful.
You can easily use it like:
URLParser *parser = [[[URLParser alloc] initWithURLString:#"http://www.arijasoft.com/givemesomthing.php?a=3434&b=435edsf&c=500"] autorelease];
NSString *c = [parser valueForVariable:#"c"]; //c=500
Try the following:
NSURL *url = [NSURL URLWithString:#"http://www.arijasoft.com/givemesomthing.php?a=3434&b=435edsf&c=500"];
NSMutableString *parameterString = [NSMutableString stringWithFormat:#"{%#;}",[url parameterString]];
[parameterString replaceOccurrencesOfString:#"&" withString:#";"];
// Convert string into Dictionary
NSPropertyListFormat format;
NSString *error;
NSDictionary *paramDict = [NSPropertyListSerialization propertyListFromData:[parameterString dataUsingEncoding:NSUTF8StringEncoding] mutabilityOption: NSPropertyListImmutable format:&format errorDescription:&error];
// Now take the parameter you want
NSString *value = [paramDict valueForKey:#"c"];
Here is the native iOS approach using NSURLComponents and NSURLQueryItem classes:
NSString *theURLString = #"http://www.arijasoft.com/givemesomthing.php?a=3434&b=435edsf&c=500";
NSArray<NSURLQueryItem *> *theQueryItemsArray = [NSURLComponents componentsWithString:theURLString].queryItems;
for (NSURLQueryItem *theQueryItem in theQueryItemsArray)
{
NSLog(#"%# %#", theQueryItem.name, theQueryItem.value);
}