NSUserDefault 存入NSMutableArray数组解决方案

1.NSUserDefault 里面存数据

NSUserDefaults *currentDefaults = [NSUserDefaults standardUserDefaults];

//需要将你需要存储的数据转成data

NSData *data = [NSKeyedArchiver archivedDataWithRootObject:yourObject];

[currentDefaults setObject:data forKey:@"yourKeyName"];

2.接下来就是在 NSUserDefault 里面取数据

NSData *data = [currentDefaults objectForKey:@"yourKeyName"];

yourObjectType * obj = [NSKeyedUnarchiver unarchiveObjectWithData:data];

3.如果数组中的数据是实体类，则需要遵守NSCoding协议

@interface MyModel:NSObject
@property (copy,nonatomic)NSString * name;
@property (nonatomic)int age;
@end

@implementation MyModel

-(instancetype)initWithCoder:(NSCoder *)aDecoder{
    if (self = [super init]) {
        self.name = [aDecoder decodeObjectForKey:@"kName"];
        self.age = [aDecoder decodeInt32ForKey:@"kAge"];
    }
    return self;
}

-(void)encodeWithCoder:(NSCoder *)aCoder{
    [aCoder encodeObject:self.name forKey:@"kName"];
    [aCoder encodeInt32:self.age forKey:@"kAge"];
}