如何在NSUserDefaults中存储自定义对象
问题描述:
我为重复的问题致歉.我是ios新手.我想将自定义对象存储在userdefaults中.我正在使用Objective-C.
I apologize for duplicate Question . I am new in ios . I want to store custom objects in userdefaults. I am using objective-c .
预先感谢
答
首先,您要像下面创建自定义类.
First you create custom class Like below.
CustomObject.h
CustomObject.h
#import <Foundation/Foundation.h>
@interface CustomObject : NSObject<NSCoding>
@property(strong,nonatomic)NSString *name;
@end
CustomObject.m
CustomObject.m
#import "CustomObject.h"
@implementation CustomObject
- (void)encodeWithCoder:(NSCoder *)encoder {
//Encode properties, other class variables, etc
[encoder encodeObject:self.name forKey:@"name"];
}
- (id)initWithCoder:(NSCoder *)decoder {
if((self = [super init])) {
//decode properties, other class vars
self.name = [decoder decodeObjectForKey:@"name"];
}
return self;
}
然后创建CustomObject类对象并存储在NSUserDefaults中
Then create CustomObject class object and store in NSUserDefaults
这样存储您的对象
CustomObject *object =[CustomObject new];
object.name = @"test";
NSMutableArray *arr = [[NSMutableArray alloc]init];
[arr addObject:object];
NSData *encodedObject = [NSKeyedArchiver archivedDataWithRootObject:arr];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:encodedObject forKey:@"storeObject"];
[defaults synchronize];
像这样从NSUserDefaults获取自定义对象
get custom object from NSUserDefaults like this
NSData *storedEncodedObject = [defaults objectForKey:@"storeObject"];
NSArray *arrStoreObject = [NSKeyedUnarchiver unarchiveObjectWithData:storedEncodedObject];
for (int i=0; i<arrStoreObject.count; i++)
{
CustomObject *storedObject = [arrStoreObject objectAtIndex:i];
NSLog(@"%@",storedObject.name);
}