CODEWITHSUNDEEP
iosobjective-c
Richard
Richard

Reputation: 125

how to pass a NSString from NSObject to UIViewcontrller?

I understand this is a very basic question, but as a beginner who already google a bunch of resources I just couldn't make it. I would like to pass a NSString from a NSObject to UIViewController. I know if want to pass a value to another class I need to make it public. I have a method in DataConnection.m

- (void)jsonParse{

    NSString* path  = @"http://phdprototype.tk/getResultData.php";
    NSURL* url = [NSURL URLWithString:path];
    NSString* jsonString = [[NSString alloc]initWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];
    NSData* jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
    NSDictionary* dic = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableLeaves error:nil];

    NSDictionary* resultDic = [dic objectForKey:@"maxid"];
    NSString* recData = [resultDic objectForKey:@"recommendData"];
    NSString* rData = [resultDic objectForKey:@"room"];
    NSString* lData = [resultDic objectForKey:@"level"];

    NSLog(@"recommendData = %@, room = %@, level = %@",recData,rData,lData);
    self->_room = rData;
    self->_level = lData;
    self->_recommendID = recData;

}

what I want to do is to pass the value of recData to another UIViewController. So I have made a code in 'h: 

@property (nonatomic) NSString *recommendID;

in my UIViewController I have this code:

[self.delegate NextScreen: self ndx: recData];

I would like pass value to reData. Anyone tell me how to do that?? sorry for my programme knowledge!

~~~ update~~~ I have put the codes like this: 

DataConnection *data = [[DataConnection alloc] init];
[data jsonParse];
[self.delegate NextScreen: self ndx: [data.recommendID]];

but i got expected identifier??

Upvotes: 0

Views: 218

Answers (2)

BrianChristo
BrianChristo

Reputation: 193

"mmmmmm~i have try some code like DataConnection *data = [DataConnection jsonParse]; but i got error of no known class method for selector of "jsonParse" ps: i have put - (void)jsonParse; in DataConnection.h –"

Above mentioned way is wrong way of calling a method. you can call it this way:

DataConnection *data = [[DataConnection alloc] init]; [data jsonParse];

But, as per your question,

"what I want to do is to pass the value of recData to another UIViewController. So I have made a code in 'h:"

Change the return type of jsonParse to NSDictionary and return the resultDic which you wish to transfer.

- (NSDictionary *)jsonParse{

    NSString* path  = @"http://phdprototype.tk/getResultData.php";
    NSURL* url = [NSURL URLWithString:path];
    NSString* jsonString = [[NSString alloc]initWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];
    NSData* jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
    NSDictionary* dic = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableLeaves error:nil];

    NSDictionary* resultDic = [dic objectForKey:@"maxid"];
   /* NSString* recData = [resultDic objectForKey:@"recommendData"];
    NSString* rData = [resultDic objectForKey:@"room"];
    NSString* lData = [resultDic objectForKey:@"level"];

    NSLog(@"recommendData = %@, room = %@, level = %@",recData,rData,lData);
    self->_room = rData;
    self->_level = lData;
    self->_recommendID = recData;*/

    return resultDic;
}

In your view controller, 

@property (nonatomic,retain) NSDictionary *resultDict;
@synthesize resultDict;

DataConnection *data = [[DataConnection alloc] init];
 self.resultDict = (NSDictionary *)[data jsonParse];
 _recommendID = [resultDic objectForKey:@"recommendData"];
 _room = [resultDic objectForKey:@"room"];
 _level = [resultDic objectForKey:@"level"];

now recommendID will have the recData value.

Upvotes: 2

myName
myName

Reputation: 3

have you included

 @synthesize recommendID;

in the DataConnection.m file?

I did consider adding this as a comment, but i dont have enough reputation for commenting.

Upvotes: 0

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