I just started developing iOS using objective-c, and I've had some trouble getting used to the syntax. i made a signup form in objective c how i can stored fields information in NSDictionary
// You have already all objects
NSString *loginString = #"user1";
NSString *passwordString = #"password1";
NSDictionary *dict = #{#"login":loginString, #"password":passwordString};
// You do not have all objects
NSMutableDictionary *mDict = [NSMutableDictionary new];
//When you have loginString you add it to the mDict
[mDict setObject:#"user2" forKey:#"login"];
//When you have passwordString you add it to the mDict
[mDict setObject:#"password2" forKey:#"password"];
try this
NSDictionary *dict=#{#"firstname" : txtAddFirstName.text,
#"lastname" :txtAddLastName.text,
#"region" :txtRegion.text,
#"street" :txtVAddress.text,
#"company" :txtAddCompny.text,
#"city" :txtCity.text,
#"country" : countryCode,
#"postcode" :txtZip.text,
#"telephone" :txtTelephone.text,
#"fax" :txtFax.text,
};
Related
Can anybody help me create an NSDictionary format of the following structure:
{
key1 = "value1";
key2 = "value2";
key3 = [
{
key01 = "value01";
key02 = "value02";
},
{
key01 = "value01";
key02 = "value02";
},
{
key01 = "value01";
key02 = "value02";
}
];
}
Try this code it might help you.
NSDictionary *dicationary = #{
#"key1":#"value1",
#"key2":#"value2",
#"key3":#[#{#"key01":#"value01",#"key02":#"value02"},
#{#"key01":#"value01",#"key02":#"value02"},
#{#"key01":#"value01",#"key02":#"value02"}]
};
There is API in obj-c to convert Json to nsdictionary .I guess you should try that :
First convert json to nsdata (assuming you above JSON is in string format)
2.Then you API to convert that to NSDictionary :
NSDictionary *dictionary = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
Just to answer your question about converting that JSON data to NSDictionary, here it is:
(assuming you already got your JSON data)
// add the first 2 VALUES with it's KEYS
NSMutableDictionary *mainDict = [NSMutableDictionary dictionary];
[mainDict setValue:VALUE1 forKey:KEY1];
[mainDict setValue:VALUE2 forKey:KEY2];
// then for the last KEY, create a mutable array where you will store your sub dictionaries
NSMutableArray *ma = [NSMutableArray array];
NSMutableDictionary *subDict = [NSMutableDictionary dictionary];
[subDict setValue:SUB_VALUE1 forKey:SUB_KEY1];
[subDict setValue:SUB_VALUE1 forKey:SUB_KEY2];
[ma addObject:subDict];
// then add that array to your main dictionary
[mainDict setValue:ma forKey:KEY3];
// check the output
NSLog(#"mainDict : %#", mainDict);
// SAMPLE DATA - Test this if this is what you want
NSMutableDictionary *mainDict = [NSMutableDictionary dictionary];
[mainDict setValue:#"value1" forKey:#"key1"];
[mainDict setValue:#"value2" forKey:#"key2"];
NSMutableArray *ma = [NSMutableArray array];
NSMutableDictionary *subDict = [NSMutableDictionary dictionary];
[subDict setValue:#"subValue1" forKey:#"subKey1"];
[subDict setValue:#"subValue2" forKey:#"subKey2"];
[ma addObject:subDict];
[mainDict setValue:ma forKey:#"key3"];
NSLog(#"mainDict : %#", mainDict);
The following should work for you:
NSString *jsonString = #"{\"ID\":{\"Content\":268,\"type\":\"text\"}}";
NSData *data = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
NSLog(#"%#", jsonDict[#"ID"][#"Content"]);
Will return you:
268
I get this JSON object from my web service
0: {
Username: "John"
Password: "12345"
Position: "Admin"
Job: "Developer"
ResourceJobId: 1
}
When I try to assign a value, for example, to Username JSON string, I get a semantic error:
id obj = [NSJSONSerialization JSONObjectWithData:data
options:NSJSONReadingAllowFragments
error:&error];
for (NSDictionary *dictionary in array) {
NSString *usernameString = #"";
//this line of code gives me an error: Expression is not assignable
[dictionary objectForKey:#"Username"] = usernameString ;
I know how get the JSON object with NSJSONSerialization class, but my target is how assign the value #"" to the JSON object.
So how can I assign the value #"" to the Username JSON string?
While you are trying to fetched dictionary from array. it is not mutable dictionary so you need to created NSMutableDictionary while fetching data from Array. following code will help you to change username.
for (NSMutableDictionary *dictionary in array)
{
NSMutableDictionary* dictTemp = [NSMutableDictionary dictionaryWithDictionary:dictionary];
[dictTemp setObject:usernameString forKey#"Username"];
[_arrayList replaceObjectAtIndex:index withObject:dictTemp];
}
Well your assignment operation is written wrong, it should be indeed like this:
If you need to get value from dictionary
usernameString = [dictionary objectForKey:#"Username"];
If you want to set a value to your dictionary, first of all your dictionary should be NSMutableDictionary
[dictionary setObject:usernameString forKey:#"Username"];
NSData *data = [NSData dataWithContentsOfURL:url];
NSError *error;
id obj = [NSJSONSerialization JSONObjectWithData:data
options:NSJSONReadingAllowFragments
error:&error];
if(!error && [obj isKindOfClass:[NSArray class]]){
NSArray *array = (NSArray *)obj;
Booking *booking = nil;
for (NSMutableDictionary *dictionary in array) {
NSString *usernameString = #"";
//this line of code gives me an error: Expression is not assignable
[dictionary objectForKey:#"Username"] = usernameString;
Yes, is a compiler error
You need to have a mutabledictionary inorder to change the value. Try this
for (NSDictionary *dictionary in array) {
NSMutableDictionary *mutableDictionary = [NSMutableDictionary dictionaryWithDictionary:dictionary];
NSString *usernameString = #"";
[mutableDictionary setValue:#"" forKey:usernameString];
}
Even the answers are correct, I want to add that you do not have to do this your own. NSJSONSerialization already has a solution for that. Simply pass as options one of these:
NSJSONReadingMutableContainers = (1UL << 0),
NSJSONReadingMutableLeaves = (1UL << 1),
when reading the JSON.
I want to make an autocomplete with a tableView, for that I have this function :
-(AutocompletionTableView *)autoCompleter
{
if (!_autoCompleter)
{
NSMutableDictionary *options = [NSMutableDictionary dictionaryWithCapacity:2];
[options setValue:[NSNumber numberWithBool:YES] forKey:ACOCaseSensitive];
[options setValue:nil forKey:ACOUseSourceFont];
_autoCompleter = [[AutocompletionTableView alloc] initWithTextField:self.textField inViewController:self withOptions:options];
_autoCompleter.autoCompleteDelegate = self;
_autoCompleter.suggestionsDictionary = [NSArray arrayWithObjects:#"hostel",#"caret",#"carrot",#"house",#"horse", nil];
}
return _autoCompleter;
}
The Problem :
Instead of autocompleting from an Array, I want to autocomplete from a remote JSON file.
Any idea on I how I can do such thing ? A code snippet will be very helpful, as I am a newbie in iOS development.
After making a request to the server using NSURLConnection, you should receive an NSData containing the following data:
["hostel","caret","carrot","house","horse"]
This NSData is something like this:
NSString* data = #"[\"hostel\",\"caret\",\"carrot\",\"house\",\"horse\"]";
NSData* dataReceived = [data dataUsingEncoding:NSUTF8StringEncoding];
So, to convert it into an array, you can call NSJSONSerialization, like this:
NSError *jsonError = nil;
NSArray *responseDictionary = [NSJSONSerialization JSONObjectWithData:dataReceived options:0 error:&jsonError];
if(jsonError == nil)
{
_autoCompleter.suggestionsDictionary = responseArray;
}
I am trying to parse the file location from the following so that image can be displayed. How do I do it?
[
{
"title":"testing barcode display",
"body":"lets see if it renders \r\n\r\n",
"author":"1",
"created":"1373490143",
"nid":"5",
"Barcode":"<img class=\"barcode\" typeof=\"foaf:Image\" src=\"http://mysite.com/sites/default/files/barcodes/95b2d526b0a8f3860e7309ba59b7ca11QRCODE.png\" alt=\"blahimage\" title=\"blahimage\" />"
}
]
I have a table view which displays the title tag. I need to display the entire content in the detail view. I can do everything except the Barcode tag. Please advise.
If it should be done, parse the xml
NSString *xmlString = #"<img class=\"barcode\" typeof=\"foaf:Image\" src=\"http://mysite.com/sites/default/files/barcodes/95b2d526b0a8f3860e7309ba59b7ca11QRCODE.png\" alt=\"blahimage\" title=\"blahimage\" />";
GDataXMLElement *xmlElement = [[GDataXMLElement alloc]initWithXMLString:xmlString error:nil];
NSArray *attributes = [xmlElement attributes];
[attributes enumerateObjectsUsingBlock:^(GDataXMLNode * node, NSUInteger idx, BOOL *stop) {
NSLog(#"%# : %#",node.name,node.stringValue);
}];
OR
NSString *class = [[xmlElement attributeForName:#"class"] stringValue];
NSString *typeOf = [[xmlElement attributeForName:#"typeof"] stringValue];
NSString *src = [[xmlElement attributeForName:#"src"] stringValue];
NSString *alt = [[xmlElement attributeForName:#"alt"] stringValue];
NSString *title = [[xmlElement attributeForName:#"title"] stringValue];
Use json-framework or something similar.
If you do decide to use json-framework, here's how you would parse a JSON string into an NSDictionary:
SBJsonParser* parser = [[[SBJsonParser alloc] init] autorelease];
// assuming jsonString is your JSON string...
NSDictionary* myDict = [parser objectWithString:jsonString];
// now you can grab data out of the dictionary using objectForKey or another dictionary method
You have to convert json string in nsdictionary, so try this
SBJSON *json = [[SBJSON new] autorelease];
NSError *error;
NSDictionary *dict = [json objectWithString:YOUR_JSON_STRING error:&error];
add user this dictionary to display details in tableView
I'm starting objective-c development and I would like to ask the best way to implement a list of keys and values.
In Delphi there is the class TDictionary and I use it like this:
myDictionary : TDictionary<string, Integer>;
bool found = myDictionary.TryGetValue(myWord, currentValue);
if (found)
{
myDictionary.AddOrSetValue(myWord, currentValue+1);
}
else
{
myDictionary.Add(myWord,1);
}
How can I do it in objective-c? Is there equivalent functions to the above mentioned AddOrSetValue() or TryGetValue()?
Thank you.
You'd want to implement your example along these lines:
EDIT:
//NSMutableDictionary myDictionary = [[NSMutableDictionary alloc] init];
NSMutableDictionary *myDictionary = [[NSMutableDictionary alloc] init];
NSNumber *value = [myDictionary objectForKey:myWord];
if (value)
{
NSNumber *nextValue = [NSNumber numberWithInt:[value intValue] + 1];
[myDictionary setObject:nextValue forKey:myWord];
}
else
{
[myDictionary setObject:[NSNumber numberWithInt:1] forKey:myWord]
}
(Note: you can't store ints or other primitives directly in a NSMutableDictionary, hence the need to wrap them in an NSNumber object, and make sure you call [myDictionary release] when you've finished with the dictionary).
The other answers are correct, but there is more modern syntax for this now. Rather than:
[myDictionary setObject:nextValue forKey:myWord];
You can simply say:
myDictionary[myWord] = nextValue;
Similarly, to get a value, you can use myDictionary[key] to get the value (or nil).
Yep:
- (id)objectForKey:(id)key;
- (void)setObject:(id)object forKey:(id)key;
setObject:forKey: overwrites any existing object with the same key; objectForKey: returns nil if the object doesn't exist.
Edit:
Example:
- (void)doStuff {
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
[dict setObject:#"Foo" forKey:#"Key_1"]; // adds #"Foo"
[dict setObject:#"Bar" forKey:#"Key_2"]; // adds #"Bar"
[dict setObject:#"Qux" forKey:#"Key_2"]; // overwrites #"Bar"!
NSString *aString = [dict objectForKey:#"Key_1"]; // #"Foo"
NSString *anotherString = [dict objectForKey:#"Key_2"]; // #"Qux"
NSString *yas = [dict objectForKey:#"Key_3"]; // nil
}
Reedit: For the specific example there exists a more compact approach:
[dict
setObject:
[NSNumber numberWithInteger:([[dict objectForKey:#"key"] integerValue] + 1)]
forKey:
#"key"
];
Crazy indentation for readability.