Q - iOS - Search and use specific part of parsed JSON array - ios

Question

This is my first time using JSON. In my app I am fetching some data from "Open Weather API". I get back some array, with way to many entries, and I need to search ones that are on specific day and return temp.day and weather.icon from them. So far I managed to fetch data propely. As far I know i should use some FOR loop with IF inside it, but I am pulling my hairs out how to do it in Objective C.
There is my fetch method:
- (void)fetchedData:(NSData *)responseData {
//parse out the json data
NSError* error;
NSDictionary* json = [NSJSONSerialization
JSONObjectWithData:responseData //1
options:kNilOptions
error:&error];
NSArray* weatherList = [json objectForKey:#"list"];
NSLog(#"everything %#", weatherList ); //3
}
And part array from NSLog:
{
clouds = 92;
deg = 265;
dt = 1456221600;
humidity = 100;
pressure = "1007.96";
rain = "0.24";
speed = "5.12";
temp = {
day = "4.11";
eve = "4.62";
max = "4.87";
min = "2.78";
morn = "4.11";
night = "2.78";
};
weather = (
{
description = "light rain";
icon = 10d;
id = 500;
main = Rain;
}
);
},
{
clouds = 88;
deg = 268;
dt = 1456308000;
humidity = 98;
pressure = "1012.04";
rain = "1.31";
speed = "6.35";
temp = {
day = "3.57";
eve = "3.74";
max = "3.74";
min = "2.38";
morn = "2.53";
night = "2.38";
};
weather = (
{
description = "light rain";
icon = 10d;
id = 500;
main = Rain;
}
);
},
{
clouds = 20;
deg = 243;
dt = 1456394400;
humidity = 100;
pressure = "1015.42";
snow = "0.25";
speed = "5.08";
temp = {
day = "2.95";
eve = "4.09";
max = "4.54";
min = "-0.65";
morn = "1.74";
night = "-0.65";
};
weather = (
{
description = "light snow";
icon = 13d;
id = 600;
main = Snow;
}
);
},
{
clouds = 80;
deg = 273;
dt = 1456480800;
humidity = 100;
pressure = "1016.63";
snow = "0.04";
speed = "2.79";
temp = {
day = "0.2";
eve = "2.79";
max = "2.79";
min = "-3.33";
morn = "-2.7";
night = "-2.42";
};
weather = (
{
description = "light snow";
icon = 13d;
id = 600;
main = Snow;
}
);
},
{
clouds = 87;
deg = 132;
dt = 1456567200;
humidity = 0;
pressure = "1007.07";
rain = "0.22";
snow = "0.03";
speed = 5;
temp = {
day = "3.96";
eve = "1.48";
max = "3.96";
min = "-3.12";
morn = "-3.12";
night = "-1.59";
};
weather = (
{
description = "clear sky";
icon = 01d;
id = 800;
main = Clear;
}
);
}
What are good practices? Do I fetch proper enough big part of JSON?
Should I use dome NSDictionary too? Any ideas are welcome!
Thanks

Answer 1

1) As per documentation given the time is in GMT format so you need to convert the time in IST to compare
here is code to convert the time . I dont know your time zone I converted it in Indian Standard Time
for ( NSDictionary *obj in weatherList) {
NSDateFormatter *inDateFormatter = [[NSDateFormatter alloc] init];
inDateFormatter.dateFormat = #"dd-MM-yyyy";
inDateFormatter.timeZone = [NSTimeZone timeZoneWithAbbreviation:#"IST"];
NSDate *inDate = [inDateFormatter dateFromString:[obj objectForKey:#"dt"]];
if ([self isItToday:inDate]) {
NSDictionary * tempDict = [obj objectForKey:#"temp"];
NSDictionary * weatherDict = [[obj objectForKey:#"weather"]objectForKey:0];
NSString * dayTemp = [tempDict objectForKey:#"day"];//only storing for time being you can use where you needed
NSString * icon = [weatherDict objectForKey:#"icon"];//only storing for time being you can use where you needed
}
}
2) Now you need to compare it with todays date
+ (BOOL)isItToday:(NSDate *)date {
if (date != nil) {
NSString *givenDateString = [self stringFromDate:date inDateFormat:#"dd-MM-yyyy"];
NSString *toDayString = [self stringFromDate:[NSDate date] inDateFormat:#"dd-MM-yyyy"];
NSDate *givenDate = [self dateFromString:givenDateString inDateFormat:#"dd-MM-yyyy"];
NSDate *toDay = [self dateFromString:toDayString inDateFormat:#"dd-MM-yyyy"];
if ([givenDate isEqualToDate:toDay]) {
return YES;
} else {
return NO;
}
} else {
return NO;
}
}
+ (NSString *)stringFromDate:(NSDate *)date inDateFormat:(NSString *)inDateformat
{
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setLocale:kLocaleIdentifierEN_US_POSIX];
[dateFormatter setDateFormat:inDateformat];//#"dd/MM/yyyy"
return [dateFormatter stringFromDate:date];
}
+ (NSDate *)dateFromString:(NSString *)stringDate inDateFormat:(NSString *)inDateformat
{
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setLocale:kLocaleIdentifierEN_US_POSIX];
[dateFormatter setDateFormat:inDateformat];//#"dd/MM/yyyy"
return [dateFormatter dateFromString:stringDate];
}
also add this line
#define kLocaleIdentifierEN_US_POSIX [NSLocale localeWithLocaleIdentifier:#"en_US_POSIX"]

Answer 2

Use following code,
double comparingdt = 1456308000;
__block NSString *tempday, *weathericon;
[weatherList enumerateObjectsWithOptions:NSEnumerationConcurrent usingBlock:^(NSDictionary *weather, NSUInteger idx, BOOL * _Nonnull stop) {
*stop = ([weather[#"dt"] doubleValue] == comparingdt);
if (*stop)
{
tempday = weather[#"temp"][#"day"];
weathericon = [weather[#"weather"] firstObject][#"icon"];
}
}];