iOS saves model data (custom model can be stored locally)

1. First create class Category: Inherit from Nsuserdefaults

2 Second premise: Save the model to achieve nscoding

3. Implement both methods in a custom class

-(void) Setcustomobj: (ID) obj forkey: (NSString *) key;

-(ID) Customobjforkey: (NSString *) key;

Implement both methods in a custom class

-(void) Setcustomobj: (ID) obj forkey: (NSString *) key

{

if ([obj respondstoselector: @selector (encodewithcoder:)] = = NO) {

NSLog (@ "Object deposit failed! The object must implement the Encodewithcoder of the Nscoding Protocol: Method ");

Return

}

NSData * Encodeobject = [Nskeyedarchiver archiveddatawithrootobject:obj];

Nsuserdefaults * defaults = [Nsuserdefaults standarduserdefaults];

[Defaults setobject:encodeobject Forkey:key];

[Defaults synchronize];

}

-(ID) Customobjforkey: (NSString *) key

{

Nsuserdefaults * defaults = [Nsuserdefaults standarduserdefaults];

NSData * Encodeobject = [defaults objectforkey:key];

if (Encodeobject = = nil) {

return nil;

}

ID obj = [nskeyedunarchiver unarchiveobjectwithdata:encodeobject];

return obj;

}

4. Come back to our save model to implement the Nscoding protocol

-(ID) Initwithcoder: (Nscoder *) decoder

{

self = [super Initwithcoder:decoder];

if (self) {

Self.cityid = [Decoder decodeobjectforkey:@ "Cityid"];

Self.cityname = [Decoder decodeobjectforkey:@ "CityName"];

Self.citylat = [Decoder decodeobjectforkey:@ "Citylat"];

SELF.CITYLNG = [Decoder decodeobjectforkey:@ "CITYLNG"];

Self.firstcharacter = [Decoder decodeobjectforkey:@ "Firstcharacter"];

Self.subsidiarybankid = [Decoder decodeobjectforkey:@ "Subsidiarybankid"];

}

return self;

}

-(void) Encodewithcoder: (Nscoder *) Acoder

{

[Acoder encodeObject:self.cityId forkey:@ "Cityid"];

[Acoder encodeObject:self.cityName forkey:@ "CityName"];

[Acoder encodeObject:self.cityLat forkey:@ "Citylat"];

[Acoder encodeObject:self.cityLng forkey:@ "CITYLNG"];

[Acoder encodeObject:self.firstCharacter forkey:@ "Firstcharacter"];

[Acoder encodeObject:self.subsidiaryBankId forkey:@ "Subsidiarybankid"];

}

5. Finally came to the controller, the instantiation of the class, you can achieve the preservation model

iOS saves model data (custom model can be stored locally)