Now, I have a realm model , including images, audios and others. So I have to get the URLs of the media files and give the model value of the URLs. But I meet a problem that I cannot save them into the realm. Because I can not save NSArray , also when I use the RLMArray to contain them ,it also don't be solved. So how can I give my model the URLs?
Its not possilbe to directly add the NSURL type in Realm but you can use workaround on your own like :-
#interface MyModel : JOBIBaseModel
#property (nonatomic, strong) NSString * urlString;
-(NSURL *)getUrl;
#end
#implementation MyModel
-(NSURL *)getUrl{
return [NSURL URLWithString:self.urlString];
}
#end
Then access it from your object like:-
NSURL *url=Obj.getUrl;
Update for array
RLM_ARRAY_TYPE(MyArrayModel);
#interface MyArrayModel : JOBIBaseModel
#property (nonatomic, strong) NSString * urlString;
-(NSURL *)getUrl;
#end
#implementation MyArrayModel
-(NSURL *)getUrl{
return [NSURL URLWithString:self.urlString];
}
#end
#interface MyModel : JOBIBaseModel
#property (nonatomic, strong) RLMArray <MyArrayModel> * strings;
#end
#implementation MyModel
#end
And use it like:-
NSURL *url=Obj.strings[0].getUrl;
Related
I use JSONModel to hold my app datasource, and use -(id)initWithArray:(NSArray *)array modelClass:(Class)cls generated an JSONModelArray, now I want to do some search stuff like enumerateObjectsUsingBlock: method does. But I found that JSONModelArray is not inherited from NSArray.
So, how can I do this?
Try use BWJSONMatcher to convert json string to a NSArray.
For example, your json string seems like :
[{"name":"Arron","age":20,"grade":2},{"name":"Burrows","age":21,"grade":2}]
All you have to do is declare your own data model:
#interface Student : NSObject
#property (nonatomic, strong) NSString *name;
#property (nonatomic, assign) NSInteger age;
#property (nonatomic, assign) NSInteger grade;
#end
BWJSONMatcher will help you convert it to a NSArray in a very neat way:
NSArray *students = [BWJSONMatcher matchJSON:jsonString withClass:[Student class]];
I have this simple model class that represent rss article called RSSEntry.
Now I want to start working wit core data with this model class, but I didn't create the project with the 'use core data' checkbox checked.
this is the class:
#import <Foundation/Foundation.h>
#interface FRSSEntry : NSObject{
NSString *_blogTitle;
NSString *_articleTitle;
NSString *_articleUrl;
NSDate *_articleDate;
NSString *_articleImageUrl;
NSString *_content;
}
#property (copy) NSString *blogTitle;
#property (copy) NSString *articleTitle;
#property (copy) NSString *articleUrl;
#property (copy) NSDate *articleDate;
#property (copy) NSString *articleImageUrl;
#property (copy) NSString *content;
- (id)initWithBlogTitle:(NSString*)blogTitle articleTitle:(NSString*)articleTitle articleUrl:(NSString*)articleUrl articleDate:(NSDate*)articleDate articleImageUrl:(NSString *)imageUrl andContent:(NSString *)content;
#end
the implementations is:
#import "FRSSEntry.h"
#implementation FRSSEntry
#synthesize blogTitle = _blogTitle;
#synthesize articleTitle = _articleTitle;
#synthesize articleUrl = _articleUrl;
#synthesize articleDate = _articleDate;
#synthesize articleImageUrl = _articleImageUrl;
#synthesize content = _content;
- (id)initWithBlogTitle:(NSString*)blogTitle articleTitle:(NSString*)articleTitle articleUrl:(NSString*)articleUrl articleDate:(NSDate*)articleDate articleImageUrl:(NSString *)imageUrl andContent:(NSString *)content
{
if ((self = [super init])) {
_blogTitle = [blogTitle copy];
_articleTitle = [articleTitle copy];
_articleUrl = [articleUrl copy];
_articleDate = [articleDate copy];
_articleImageUrl = [imageUrl copy];
_content = [content copy];
}
return self;
}
#end
very simple. Now how do I convert it so I can use it as a core data entity?
So to transform your model class into an NSManagedObject subclass you have to remove the instance variable declarations. Then replace all your #synthesize statements with #dynamic. This tells the compiler that CoreData will provide the implementation for those properties so it can do it's magic there. The custom initializer you have then also needs to be removed because NSManagedObject objects are initialized in a different way.
The code would look something like
#import <Foundation/Foundation.h>
#interface FRSSEntry : NSManagedObject
#property (copy) NSString *blogTitle;
#property (copy) NSString *articleTitle;
#property (copy) NSString *articleUrl;
#property (copy) NSDate *articleDate;
#property (copy) NSString *articleImageUrl;
#property (copy) NSString *content;
#end
-
#import "FRSSEntry.h"
#implementation FRSSEntry
#dynamic blogTitle;
#dynamic articleTitle;
#dynamic articleUrl;
#dynamic articleDate;
#dynamic articleImageUrl;
#dynamic content;
#end
You usually initialize them with something like
// Get the entity description
NSEntityDescription *entityDescription = [NSEntityDescription entityForName:#"FRSSEntry" inManagedObjectContext:context];
// Insert a new YourModelObject into the context
ReceivedMessage *newMessage = [[FRSSEntry alloc] initWithEntity:entityDescription insertIntoManagedObjectContext:context];
You could have a custom initializer but you would have to call [super initWithEntity:entityDescription insertIntoManagedObjectContext:context]. The initializer would get really long with all this parameters so I suggest you just set each property once you have the object initialized.
Judging from your response, you have just begun CoreData integration. Creating an NSManagedObject subclass is just a tip of the iceberg when working with core data. CoreData is a big an complex framework so I suggest you start by reading https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/CoreData/cdProgrammingGuide.html. Stack Overflow is also full of questions and great answers on this topic.
Another thing I suggest you look into is MagicalRecord. It's a great library that makes some of the tedious tasks very simple: https://github.com/magicalpanda/MagicalRecord
Ive been working with JSONModel, the tutorials are making sense. They are parsing JSON contain an array with multiple indexes.
I wanted to make sure JSONModel allowed to be used with say this dataset: https://gist.github.com/ryancoughlin/8043604
tide is not an array correct? But there is tide.tideSummary - which contains array of tide data across multiple days.
AllTide.h
#import "JSONModelLib.h"
#import "Tide.h"
#interface AllTide : JSONModel
#property (strong,nonatomic) NSDictionary<Tide> *tide;
#end
Tide.h
#import "JSONModelLib.h"
#import "TideSummaryStats.h"
#protocol Tide #end
#interface Tide : JSONModel
#property (nonatomic, strong) NSArray<TideSummaryStats> *tideSummaryStats;
#end
TideSummaryStats.h
#import "JSONModelLib.h"
#protocol TideSummaryStats #end
#interface TideSummaryStats : JSONModel
#property (nonatomic, strong) NSString *maxheight;
#property (nonatomic, strong) NSString *minheight;
#end
TideDetailViewController - Displays a single location (detail view) vs a list of multiple locations
#interface TideDetailViewController () {
AllTide *_objTide;
}
#end
#implementation TideDetailViewController
- (void)viewDidAppear:(BOOL)animated {
NSString *locationQueryURL = #"http://api.wunderground.com/api/xxxxx/tide/geolookup/q/43.5263,-70.4975.json";
//fetch the feed
_objTide = [[AllTide alloc] initFromURLWithString:locationQueryURL completion:^(JSONModel *model, JSONModelError *err) {
NSLog(#"Tides: %#", _objTide.tide);
}];
}
Been going through several JSONModel tutorials and it makes sense, I think I am having trouble where my JSON format differs from the tutorials. Again, where my tide does not return an array.
Would this be a good case to utilize JSONModel keymapper?
Any ideas? Let me know if I can provide anything else. Been diving around for some guidance, but a bit stuck. Thanks in advance!
you don't need AllTide.h
try this:
TideDetailViewController - Displays a single location (detail view) vs a list of multiple locations
#interface TideDetailViewController () {
NSArray *arrTide;
}
#end
#implementation TideDetailViewController
- (void)viewDidAppear:(BOOL)animated {
NSString *locationQueryURL = #"http://api.wunderground.com/api/xxxxx/tide/geolookup/q/43.5263,-70.4975.json";
//fetch the feed
[JSONHTTPClient getJSONFromURLWithString: locationQueryURL
completion:^(NSDictionary *json, JSONModelError *err) {
arrTide = [TideSummaryStats arrayOfModelsFromDictionaries:json[#"tide"][#"tideSummaryStats"] ];
NSLog(#"Tides: %#", arrTide[0]);
}];
}
Trying to store value in NSDictionary and retrieve it
Objects
#import <Foundation/Foundation.h>
#class ATTTEstOBJ;
#interface ATTTEst : NSObject
#property (nonatomic, retain) NSString *string1;
#property (nonatomic, retain) NSString *string2;
#property (nonatomic, retain) ATTTEstOBJ *obj1;
#end
#interface ATTTEstOBJ : NSObject
#property (nonatomic, retain) NSString *string3;
#property (nonatomic, retain) NSString *string4;
#property (nonatomic, retain) NSString *array1;
#end
I know it needs to be encoded properly to save and retrieve values.but In this case it is a composite object and I have no idea, how to deal it with.
- (void) encodeWithCoder: (NSCoder *)coder
So TLDR , How to save the composite value into dictionary and retrieve it back
I want to store ATTTest into a dictionary and retrieve it back.
EDIT : Detailed explanation
ATTTEst *test=[[ATTTEst alloc]init];
test.string1=#"a";
test.string2=#"b";
ATTTEstOBJ *obj=[[ATTTEstOBJ alloc]init];
obj.string3=#"c";
obj.string4=#"d";
test.obj1=obj;
NSMutableDictionary *dict=[[NSMutableDictionary alloc]initWithCapacity:3];
[dict setObject:test forKey:#"test"];
NSLog(#"%#",dict);
ATTTEst *tester=[dict objectForKey:test];
NSLog(#"%#",tester.obj1.string3);
IT shows null.as output I want to get the value as c for tester.obj1.string3
ATTTEst *tester=[dict objectForKey:test];
should be
ATTTEst *tester=[dict objectForKey:#"test"];
You have used the object test (instead of the string #"test") as key when retrieving the object. I don't think that
was intentionally.
In order to store them into NSDictionary, you don't need to encode them.
Just do:
NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:, attestObject,#"attestObject", attest2Object,#"atttest2" nil];
Where attestObject and attest2Object are the objects you want to store, and strings are their keys.
This has nothing to do with encoding...
This question already has an answer here:
why is my code outputting *nil description*
(1 answer)
Closed 10 years ago.
Here is my custom class:
ClassA.h
#interface ClassA : NSObject<RKRequestDelegate>{
NSString *uri;
NSString *folderUri;
NSInteger idFolder;
NSString *kind;
bool isMine;
CustomUser *owner;
NSMutableArray *usersAdministrators;
NSMutableArray *usersContributors;
NSMutableArray *usersReaders;
NSString *visibility;
NSString *name;
NSString *description;
NSMutableArray *comments;
}
#property (nonatomic,copy) NSString *uri;
#property (nonatomic,copy) NSString *folderUri;
#property (nonatomic,assign) NSInteger idFolder;
#property (nonatomic,copy) NSString *kind;
#property (nonatomic,assign) bool isMine;
#property (retain) DMIUser *owner;
#property (nonatomic,copy) NSMutableArray *usersAdministrators;
#property (nonatomic,copy) NSMutableArray *usersContributors;
#property (nonatomic,copy) NSMutableArray *usersReaders;
#property (nonatomic,copy) NSString *visibility;
#property (nonatomic,copy) NSString *name;
#property (nonatomic,copy) NSString *description;
#property (nonatomic,copy) NSMutableArray *comments;
#end
ClassA.m
#implementation ClassA
#synthesize uri,folderUri,idFolder,kind,isMine,owner,usersAdministrators,usersContributors,usersReaders,visibility,name,description,comments;
-(NSString*)description {
return #"ClassA";
}
#end
Quite simple. But when i try to create new instance of this, like this:
datas = [NSMutableArray array]; // Tried with [[NSMutableArray alloc] init] => same thing
ClassA *classA = [[ClassA alloc] init];
[datas addObject:classA];
NSLog(#"classA = %#",classA);
NSLog(#"datas = %#",datas);
First NSLog returns "ClassA".
Second NSLog returns "datas = ()"
What's wrong here? I always created class like this and i've never had problem like this.
Thanks!
Ok guyzzz i found the problem. It's my attribute:
NSString *description;
Seems that iOs doesn't love that. It conflict with the -description method in NSObject...
After that, i found a similar question here:
Why can't I use "description" as an attribute name for a Core Data entity?
Cheers
if your want to return some value implement method description in the ClassA
- (NSString *)description {
return #"ClassA";
}
You've got everything you need. Are you sure the variable you're assigning to isn't a weak one? All delegate properties are weak, therefore not retaining the object. My guess is that you're doing something like this
someObject.delegate = [[ClassA alloc] init];
NSLog(#"%#", someObject.delegate);
Because the delegate property is weak it doesn't hold onto the variable.
Edit:
This whole answer assumes you are using ARC. If not, disregard.