convert NSObject to NSDictionary [duplicate] - ios

Question

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Obj-C easy method to convert from NSObject with properties to NSDictionary?
(6 answers)
Closed 6 years ago.
How do i to convert NSObject to NSDictionary?
At first step i have converted NSDictionary to NSObject like,
QRCodeData *obj = [[QRCodeData alloc] initWithQRcodeData:myDictonary];
QRCodeData.h
#interface QRCodeData : NSObject
-(instancetype)initWithQRcodeData:(NSDictionary*)dictionary;
#end
QRCodeData.m
#implementation QRCodeData
-(instancetype)initWithQRcodeData:(NSDictionary*)dictionary
{
self = [super init];
if(self){
self.name = dictionary[#"userName"];
self.phoneNumber = dictionary[#"mobileNo"];
}
return self;
}
#end
I want my Dictionary from object, it is possible to get?
Please help and thanks in advance..

Answer 1

you can simply get dictionary like,
NSDictionary *dict = #{#"userName": obj.name ,#"mobileNo" : obj.phoneNumber };
here obj is QRCodeData's object.
Hope this will help :)

Answer 2

Easiest way is to add this method in the QRCodeData class.
- (NSDictionary *)dictionaryValue
{
return #{#"userName" : self.name, #"mobileNo" : self.phoneNumber};
}
If userName and phoneNumber could be nil you have to check that.
To call with
NSDictionary *dict = [obj dictionaryValue];

Answer 3

You can use Key-Value Coding(KVC) for this purpose. First, provide class method for all keys you want to share:
+ (NSSet *)keysToCopy
{
return [NSSet setWithObjects:#"userName", #"mobileNio", .....];
}
Then you can do something like in your init method:
for (key in [[self class] keysToCopy])
{
[self setValue:dictionary[key] forKey:key];
}
and provide another method to revert it back to NSDictionary:
- (NSDictionary *)dictionaryRepresentation
{
NSMutableDictionary *result = [NSMutableDictionary dictionary];
for (key in [[self class] keysToCopy])
{
[result setObject:[self valueForKey:key] forKey:key];
}
}
The only problem remains that not every property is compatible to NSDictionary storing.
This approach allows you to scale this solution to any Cocoa object and it doesn't require you to change anything but keysToCopy method in case if there are new properties to share.