I make an NSMutableArray(listId) (through a call to a sqlite database) with dictionaries(dizionario):
-(void)readItems {
NSString * query = #"SELECT * FROM item";
NSArray * arrayQuery = [[NSArray alloc] initWithObjects:#"id",#"title",#"note",#"icon",#"perc",#"complete",nil];
NSArray * arrayEle = [self caricaValoriDaDBStandard:query :arrayQuery];
for (int i = 0; i < [arrayEle count]; i++)
{
NSMutableDictionary *dizionario = [arrayEle objectAtIndex:i];
[listId addObject:dizionario];
}
}
How do I sort the array, for example, for the "id" key?
You can use the following code:
NSArray sortedArray = [listId sortedArrayUsingComparator: ^(id a, id b) {
NSString *first = [a objectForKey:#"id"];
NSString *second = [b objectForKey:#"id"];
return [first compare:second];
}];
Related
I want to combine the array values into one string.
my arrays are like...
array1=[#"fizan",#"nike",#"pogo"];
array2=[#"round",#"rectangle",#"square"];
array3=[#"frame",#"frame",#"frame"];
I need like this...
value1 = fizan round frame
value2 = nike rectangle frame
value3 = pogo square frame
try this:
NSArray *array1= #[#"fizan",#"nike",#"pogo"];
NSArray *array2= #[#"round",#"rectangle",#"square"];
NSArray *array3= #[#"frame",#"frame",#"frame"];
NSMutableArray *array = [[NSMutableArray alloc] initWithArray:#[array1,array2,array3]];
NSMutableArray *output = [[NSMutableArray alloc] init];
NSString *a;
NSInteger count = array.count;
for (int i = 0; i<array1.count; i++) {
a = #"";
for (int j = 0; j<count; j++) {
a = [a isEqualToString: #""] ? [NSString stringWithFormat:#"%#",[[array objectAtIndex:j] objectAtIndex:i]] : [NSString stringWithFormat:#"%# %#",a,[[array objectAtIndex:j] objectAtIndex:i]];
}
[output addObject:a];
}
for (int i = 0; i < output.count; i++) {
NSLog(#"value %i -> %#",i+1,output[i]);
}
Hope this helps!
UPDATE:
NSArray *array1= #[#"fizan",#"",#"pogo"];
NSArray *array2= #[#"round",#"rectangle",#"square"];
NSArray *array3= #[#"frame",#"frame",#"frame"];
NSMutableArray *array = [[NSMutableArray alloc] initWithArray:#[array1,array2,array3]];
NSMutableArray *output = [[NSMutableArray alloc] init];
NSString *a;
NSInteger count = array.count;
for (int i = 0; i<array1.count; i++) {
a = #"";
for (int j = 0; j<count; j++) {
a = [a isEqualToString: #""] ? [NSString stringWithFormat:#"%#",[[array objectAtIndex:j] objectAtIndex:i]] : [NSString stringWithFormat:#"%# %#",a,[[array objectAtIndex:j] objectAtIndex:i]];
}
[output addObject:a];
}
for (int i = 0; i < output.count; i++) {
NSLog(#"value %i -> %#",i+1,output[i]);
}
I have tested this code. It works perfect. Check again and reconsider the issue.
Do this
NSArray *array1 = #[#"fizan", #"nike", #"pogo"];
NSString *value = [array1 componentsJoinedByString:#" "];
NSLog(#"value = %#", value);
Output will get like
value = fizan nike pogo
For your case
NSArray *completeArray = #[#[#"fizan",#"nike",#"pogo"], #[#"round",#"rectangle",#"square"], #[#"frame",#"frame",#"frame"]];
NSMutableArray *resultArray = [NSMutableArray array];
unsigned long count = 1;
for (int i = 0; i< count; i++) {
NSMutableArray *listArray = [NSMutableArray array];
for (NSArray *itemArray in completeArray) {
count = MAX(count,itemArray.count);
if (i < itemArray.count) {
[listArray addObject:itemArray[i]];
}
}
[resultArray addObject:listArray];
}
for (NSArray *itemArray in resultArray) {
NSString *value = [itemArray componentsJoinedByString:#" "];
NSLog(#"value = %#", value);
}
output
value = fizan round frame
value = nike rectangle frame
value = pogo square frame
I have an iPad that reads data from an SQL database. The following code works fine and retrieves 2 fields from each record and reads them into an NSArray.
I now need to read 5 of the fields and I can't help but think that there is a better way of doing it rather than running 5 separate queries through php (the getinfo.php file with the choice parameter set to pick the different fields).
Any pointers to a better method for doing this?
NSString *strURLClass = [NSString stringWithFormat:#"%#%#", #"http://wwwaddress/getinfo.php?choice=1&schoolname=",obsSchoolName];
NSArray *observationsArrayClass = [[NSMutableArray alloc] initWithContentsOfURL:[NSURL URLWithString:strURLClass]];
observationListFromSQL = [[NSMutableArray alloc]init];
NSEnumerator *enumForObsClass = [observationsArrayClass objectEnumerator];
NSString *strURLDate = [NSString stringWithFormat:#"%#%#", #"http://wwwaddress/getinfo.php?choice=5&schoolname=",obsSchoolName];
NSArray *observationsArrayDate = [[NSMutableArray alloc] initWithContentsOfURL:[NSURL URLWithString:strURLDate]];
observationListFromSQL = [[NSMutableArray alloc]init];
NSEnumerator *enumForObsDate = [observationsArrayDate objectEnumerator];
id className, dateOfObs;
while (className = [enumForObsClass nextObject])
{
dateOfObs = [enumForObsDate nextObject];
[observationListFromSQL addObject:[NSDictionary dictionaryWithObjectsAndKeys:className, #"obsClass", dateOfObs, #"obsDate",nil]];
}
Yes, you can do that with less code by "folding" the statements into a loop, and using a mutable dictionary:
// Add other items that you wish to retrieve to the two arrays below:
NSArray *keys = #[#"obsClass", #"obsDate"]; // Key in the dictionary
NSArray *choices = #[#1, #5]; // Choice in the URL string
NSMutableArray *res = [NSMutableArray array];
NSMutableArray *observationListFromSQL = [NSMutableArray array];
for (int i = 0 ; i != keys.count ; i++) {
NSNumber *choice = choices[i];
NSString *strURLClass = [NSString stringWithFormat:#"http://wwwaddress/getinfo.php?choice=%#&schoolname=%#", choice, obsSchoolName];
NSArray *observationsArray = [[NSMutableArray alloc] initWithContentsOfURL:[NSURL URLWithString:strURLClass]];
NSEnumerator *objEnum = [observationsArrayClass objectEnumerator];
NSString *key = keys[i];
NSMutableDictionary *dict;
if (res.count < i) {
dict = res[i];
} else {
dict = [NSMutableDictionary dictionary];
[res addObject:dict];
}
id item;
while (item = [objEnum nextObject]) {
[res setObject:item forKey:key];
}
}
I am getting rows from a SQLite DB and trying to insert them into a dictionary. Except I keep getting errors! I get the error "Implicit conversion of an Objective-C pointer to 'const id *' is disallowed with ARC" Which I know means that I cant use a pointer when I am adding objects to my dictionary. So how do I go about fixing it so I can add those arrays to a dictionary?
NSArray *keyArray = [[NSMutableArray alloc] init ];
NSArray *valueArray = [[NSMutableArray alloc ] init ];
NSDictionary* dic;
NSInteger dataCount = sqlite3_data_count(statement);
while (sqlite3_step(statement) == SQLITE_ROW) {
#try {
for (int i = 0; i < dataCount; i ++)
{
NSString* key = [NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, i)];
NSString *value = [NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, i)];
if ([value length] == 0)
{
value = #"";
}
keyArray = [keyArray arrayByAddingObject:key];
valueArray = [valueArray arrayByAddingObject:value];
}
}
#catch (NSException *ex)
{
NSLog(#"%#,%#", [ex name], [ex reason]);
}
dic= [NSDictionary dictionaryWithObjects:valueArray forKeys:keyArray count:[keyArray count]];
The dictionaryWithObjects:forKeys:count: takes C-style arrays, not NSArray objects. The dictionaryWithObjects:forKeys: may do the trick, but you may be better off constructing a mutable dictionary as you go, bypassing NSArrays entirely.
NSDictionary* dic;
NSMutableDictionary *tmp = [NSMutableDictionary dictionary];
for (int i = 0; i < dataCount; i ++)
{
NSString* key = [NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, i)];
NSString *value = [NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, i)];
[tmp setObject:value forKey:key];
}
dict = tmp;
[dicBodyPost setValue:arrContactAddress forKey:#"contactAddress"];
OK so I know that dictionaries can't be sorted. But, say I have NSMutableArray *keys = [someDictionary allKeys]; Now, I want to sort those keys, based on the corresponding values in the dictionary (alphabetically). So if the dictionary contains key=someString, then I want to sort keys based on the strings they correspond to. I think its some application of sortUsingComparator but its a little out of my reach at this point.
NSArray *keys = [someDictionary allKeys];
NSArray *sortedKeys = [keys sortedArrayUsingComparator:^NSComparisonResult(id a, id b) {
NSString *first = [someDictionary objectForKey:a];
NSString *second = [someDictionary objectForKey:b];
return [first compare:second];
}];
NSDictionary *dict = // however you obtain the dictionary
NSMutableArray *sortedKeys = [NSMutableArray array];
NSArray *objs = [dict allValues];
NSArray *sortedObjs = [objs sortedArrayUsingSelector:#selector(compare:)];
for (NSString *s in sortedObjs)
[sortedKeys addObjectsFromArray:[dict allKeysForObject:s]];
Now sortedKey will contain the keys sorted by their corresponding objects.
Sort keys of NSDictionary based on dictionary keys
Abobe is for returning a sorted array with based on dictionary content, this is for returning an array sorted by dictionary key:
NSArray *keys = [theDictionary allKeys];
NSArray *sortedKeys = [keys sortedArrayUsingComparator:^NSComparisonResult(id a, id b) {
return [a compare:b];
}];
NSMutableArray *sortedValues = [NSMutableArray new];
for(NSString *key in sortedKeys)
[sortedValues addObject:[dictFilterValues objectForKey:key]];
Just write it here cause I didn't find it anywhere: To get an alphanumeric sorted NSDictionary back from an NSDictionary based on the value - which in my case was neccessary - you can do the following:
//sort typeDict alphanumeric to show it in order of values
NSArray *keys = [typeDict allKeys];
NSArray *sortedKeys = [keys sortedArrayUsingComparator:^NSComparisonResult(id a, id b) {
NSString *first = [typeDict objectForKey:a];
NSString *second = [typeDict objectForKey:b];
return [first compare:second];
}];
NSLog(#"sorted Array: %#", sortedKeys);
NSMutableDictionary *sortedTypeDict = [NSMutableDictionary dictionary];
int counter = 0;
for(int i=0; i < [typeDict count]; i++){
NSString *val = [typeDict objectForKey:[sortedKeys objectAtIndex:counter]];
NSString *thekey = [sortedKeys objectAtIndex:counter];
[sortedTypeDict setObject:val forKey:thekey];
counter++;
}
NSLog(#"\n\nsorted dict: %#", sortedTypeDict);
Not a big deal!
If any value from the dictionary is null then use this code
NSArray *keys = [typeDict allKeys];
NSSortDescriptor *sd = [[NSSortDescriptor alloc] initWithKey:nil ascending:YES];
NSArray *sortedKeys = [keys sortedArrayUsingDescriptors:#[sd]];
NSLog(#"SORT 1 %#",sortedKeys);
NSMutableDictionary *sortedTypeDict = [NSMutableDictionary dictionary];
int counter = 0;
for(int i=0; i < [typeDict count]; i++){
id val = [typeDict objectForKey:[sortedKeys objectAtIndex:counter]];
NSString *thekey = [sortedKeys objectAtIndex:counter];
[sortedTypeDict setObject:val forKey:thekey];
counter++;
}
NSLog(#"\n\nsorted dict: %#", sortedTypeDict);
I'm new to Objective-C and I'm trying to create a simple dictionary style app for personal use. Right now I'm attempting to make a loop that prints randomly selected NSArrays that have been added to an NSDictionary. I'd like to print each array only once. Here is the code I'm working with:
NSArray *catList = [NSArray arrayWithObjects:#"Lion", #"Snow Leopard", #"Cheetah", nil];
NSArray *dogList = [NSArray arrayWithObjects:#"Dachshund", #"Pitt Bull", #"Pug", nil];
...
NSMutableDictionary *wordDictionary = [[NSMutableDictionary alloc] init];
[wordDictionary setObject: catList forKey:#"Cats"];
[wordDictionary setObject: dogList forKey:#"Dogs"];
...
NSInteger keyCount = [[wordDictionary allKeys] count];
NSInteger randomKeyIndex = arc4random() % keyCount;
int i = keyCount;
for (i=i; i>0; i--) {
NSString *randomKey = [[wordDictionary allKeys] objectAtIndex:randomKeyIndex];
NSMutableArray *randomlySelectedArray = [wordDictionary objectForKey:randomKey];
NSLog(#"%#", randomlySelectedArray);
}
This code prints the same array "i" times. Any pointers on how to exclude previously printed arrays from being printed again?
I'm wondering if removeObjectForKey: could be of any use.
You just need to re-calculate the random key index every time you go through the loop, and then, as you suggest, use removeObjectForKey:.
Something like this:
NSArray *catList = [NSArray arrayWithObjects:#"Lion", #"Snow Leopard", #"Cheetah", nil];
NSArray *dogList = [NSArray arrayWithObjects:#"Dachshund", #"Pitt Bull", #"Pug", nil];
//...
NSMutableDictionary *wordDictionary = [[NSMutableDictionary alloc] init];
[wordDictionary setObject: catList forKey:#"Cats"];
[wordDictionary setObject: dogList forKey:#"Dogs"];
//...
while ([wordDictionary count] > 0) {
NSInteger keyCount = [wordDictionary count];
NSInteger randomKeyIndex = arc4random() % keyCount;
NSString *randomKey = [[wordDictionary allKeys] objectAtIndex:randomKeyIndex];
NSMutableArray *randomlySelectedArray = [wordDictionary objectForKey:randomKey];
NSLog(#"%#", randomlySelectedArray);
[wordDictionary removeObjectForKey: randomKey];
}
In your code, you generate a random randomKeyIndex, then use it without changing its value i times in the loop. So you get i times the same array.
NSInteger randomKeyIndex = arc4random() % keyCount;
// ...
for (i=i; i>0; i--) {
NSString *randomKey = [[wordDictionary allKeys] objectAtIndex:randomKeyIndex];
// ...
}
As you say removeObjectForKey is an option for you, you can change your code into something like this:
NSInteger keyCount = [[wordDictionary allKeys] count];
for (i=keyCount; i>0; i--) {
NSInteger randomKeyIndex = arc4random() % keyCount;
NSString *randomKey = [[wordDictionary allKeys] objectAtIndex:randomKeyIndex];
NSMutableArray *randomlySelectedArray = [wordDictionary objectForKey:randomKey];
[wordDictionary removeObjectForKey:randomKey];
keyCount--;
NSLog(#"%#", randomlySelectedArray);
}