iOS 使用NSUserdefault 保存自定义的 对象

一：NSUserDefaults支持的数据格式有：NSNumber（Integer、Float、Double），NSString，NSData，NSArray，NSDictionary，BOOL类型；

二：可以把自定义的对象，转换为NSData来达到存储对象到NSUserDefaults的目的；

如代码：

1：model.h

#import <Foundation/Foundation.h>

@interface ReplayModel : NSObject

@property (nonatomic,strong)NSNumber *useTimes;       //使用次数
@property (nonatomic,strong)NSDate *addDate;    //添加日期
@property (nonatomic,strong)NSString *replayContent;    //回复的模板内容；

@end

2: model.m

#import "ReplayModel.h"

@implementation ReplayModel

- (void)encodeWithCoder:(NSCoder *)encoder {
    //Encode properties, other class variables, etc
    [encoder encodeObject:self.useTimes forKey:@"useTimes"];
    [encoder encodeObject:self.addDate forKey:@"addDate"];
    [encoder encodeObject:self.replayContent forKey:@"replayContent"];
}

- (id)initWithCoder:(NSCoder *)decoder {
    if((self = [super init])) {
        //decode properties, other class vars
        self.useTimes = [decoder decodeObjectForKey:@"useTimes"];
        self.addDate = [decoder decodeObjectForKey:@"addDate"];
        self.replayContent = [decoder decodeObjectForKey:@"replayContent"];
    }
    return self;
}

@end

3: 使用，写入

        ReplayModel *model = [pinCiDataArray objectAtIndex:theReplayIndex];
        NSLog(@"%@ 次数 %d",model.replayContent,[model.useTimes intValue]);
        model.useTimes = [NSNumber numberWithInt:[model.useTimes intValue]+];
        NSLog(@"新次数 %d",[model.useTimes intValue]);

        [pinCiDataArray replaceObjectAtIndex:theReplayIndex withObject:model];
        NSData *encodeData = [NSKeyedArchiver archivedDataWithRootObject:pinCiDataArray];
        [[NSUserDefaults standardUserDefaults] setObject:encodeData forKey:kPiCiArrayData];

4：使用，读取

    NSData *encodeObject = [[NSUserDefaults standardUserDefaults] objectForKey:kTimeArrayData];
    NSMutableArray *tempTimeData = [NSKeyedUnarchiver unarchiveObjectWithData:encodeObject];

参考：http://stackoverflow.com/questions/2315948/how-to-store-custom-objects-in-nsuserdefaults