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So I'm building an array of url strings using extensions. I have two arrays of extensions and Im a little bit confused on how to combine them.
I am trying to produce an array of string objects with the following format:
http://mywebsite.com/images/places/extention1/extention1
http://mywebsite.com/images/places/extention2/extention2
and so on...
When I try to combine them the way I know how I end up with the full array stuck in the place holders
http://mywebsite.com/images/places/full array1/full array 2
but what I'm really trying to do is build an array of those URL strings from the other two arrays
i know this is super simple but I haven't found any documentation on combining them into a skeleton string.
This would do the trick:
NSMutableArray *urlArray = [[NSMutableArray alloc] init];
NSArray *extensions = #[#"extension1", #"extension2", #"extension3"];
NSString *urlString = #"http://mywebsite.com/images/places/";
for (NSString *extension in extensions) {
NSString *combined = [[urlString stringByAppendingPathComponent:extension] stringByAppendingPathComponent:extension];
[urlArray addObject:combined];
}
There are tons of ways to do this but it could be as simple as:
NSArray *array = [NSArray arrayWithObjects:#"http://mywebsite.com/images/places/extention1/extention1", #"http://mywebsite.com/images/places/extention1/extention2", nil];
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NSString *userUpdate = [NSString stringWithFormat:#"grant_type=password&Password=%#&UserName=%#&SchoolId=1",[params valueForKey:#"UserName"#"Password"]];
When I am running this code I am getting an error. Is this code correct?
The problem in your code is you have written %# twice and supplied only single value, that is the main reason behind error.
In NSDictionary you can get only one value at a the time using valueForKey.
Use this code
NSString *userUpdate = [NSString stringWithFormat:#"grant_type=password&Password=%#&UserName=%#&SchoolId=1",[params valueForKey:#"Password"],[params valueForKey:#"UserName"]];
In NSDictionary Get only one value using valueForKey.
For Getting Password access like [params valueForKey:#"Password"]
For UserName use syntax like [params valueForKey:#"UserName"]
Can't get both value same time use like [params valueForKey:#"UserName"#"Password"]
Below is sample code:
NSString *userUpdate = [NSString stringWithFormat:#"grant_type=password&Password=%#&UserName=%#&SchoolId=1",[params valueForKey:#"Password"],[params valueForKey:#"UserName"]];
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I'm new to iOS and its development. Here I'm passing string value to saveStringpath variable then I want to save it in type NSMutable array saveStrings but I'm getting:
thread 1 exc_bad_access (code=2 type breakspoint
please help me.
//here i need to save these data in NSMutable array
-(void)saveNSMutablearray:(NSString*)saveStringpath
{
//start Mutable array to save this values
NSMutableArray *saveStrings =[[NSMutableArray alloc]init];
[saveStrings addObject:saveStrings];
NSString *test = [saveStrings objectAtIndex:0];
NSLog(#"JSON:-----vm %#", test);
}
The problem you are facing is because of wrong variable name. In your code you are adding array into array, so to solve the problem please change this line:
[saveStrings addObject:saveStrings];
into that one:
[saveStrings addObject:saveStringpath];
and the problem is gone :)
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I'm using FatFractal for my backend in a iPhone-app. Been searching the web and FatFractal docs without any luck.
I want to retrieve the latest object in a collection from a grabbag:
NSArray *result = [[Store ff] grabBagGetAllForObj:thread grabBagName:#"messages" withQuery:#"Get the latest inserted object" error:&err];
Probably the best way to do this is to construct the full query yourself and then use the standard getArrayFromUri: method. Taking your example, this would look like:
FatFractal *ff = [Store ff];
NSString *query = [NSString stringWithFormat:
#"%#/messages?sort=createdAt desc&start=0&count=1",
[ff metaDataForObj:thread].ffUrl];
NSArray *result = [ff getArrayFromUri:query];
For more info, see http://fatfractal.com/prod/docs/queries/#sorting-and-limiting-results.
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I'm developing an iPhone app and I need to show stored data in a TableView.
After some research I decided that JSON would be best fit for storing the data. However, I couldn't find any tutorials explaining how to read JSON as a local file rather than
from a remote source, as often is the case.
Any tutorials you could recommend?
First of all: you need to load your local json string. Assuming the jsonstring is inside your project, to load it, first create nsstring pointing to the file:
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"THENAMEOFTHEFILE" ofType:#"EXTENSIONOFYOUTFILE"];
second, load the data of file:
NSData *content = [[NSData alloc] initWithContentsOfFile:filePath];
third, parse the data:
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:content options:kNilOptions error:nil];
You can use NSJSONSerialization for this.
NSError *deserializingError;
NSURL *localFileURL = [NSURL fileURLWithPath:pathStringToLocalFile];
NSData *contentOfLocalFile = [NSData dataWithContentsOfURL:localFileURL];
id object = [NSJSONSerialization JSONObjectWithData:contentOfLocalFile
options:opts
error:&deserializingError];
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I'm trying to use the JSONKIt found here https://github.com/johnezang/JSONKit to parse through a JSON Feed and put into objective-c objects. I'm new at iOS and don't really know where to start. Are there any good tutorials for using this library?
After googling, I didn't find any tutorials but using JSONKit should be self explanatory.
After downloading your JSON feed using NSURLConnection or ASIHTTPRequest simply create a dictionary of all the objects in the JSON feed like so:
//jsonString is your downloaded string JSON Feed
NSDictionary *deserializedData = [jsonString objectFromJSONString];
//Helpful snippet to log all the deserialized objects and their keys
NSLog(#"%#", [deserializedData description]);
After creating a dictionary you can simply do something like this:
NSString *string = [deserializedData objectForKey:#"someJSONKey"];
And that is the basics behind JSONKit.
JSONKit is much more powerful of course, you can find some of the other things you can do with it in JSONKit.h
I would becareful about making the assumption that objectFromJSONString is returns an NSDictionary, it can very well return an array, or nil, especially if the server returns some rarely used and thought of error.
A more appropriate action would be:
NSError *error;
id rawData = [jsonString objectFromJSONStringWithParseOptions:JKParseOptionNone error:&error];
if ( error != nil ) {
// evaluate the error and handle appropriately
}
if ( [rawData isKindOfClass:[NSDictionary class]] ) {
// process dictionary
}
else if ( [rawData isKindOfClass:[NSArray class]] ) {
// process array
}
else {
// someting else happened, 'rawData' is likely 'nil'
// handle appropriately
}
Without these checks, you could very well end up with a runtime error because the server returned someting unexpected.