需求：我们都知道NSArry中如果存放的是普通的字符串类型，是很容易存入到plist文件中，也很容易从文件中读取出来，那如果NSArray中存放的是自定义的Person对象呢？该如何存入文件中去呢？
下面我来简单写一个NSArray中继承了NSCoding协议的自定义Person对象，将这个array数组存入到plist文件中，并且能够实现读取文件中的数据的Demo
实现步骤：
1.创建一个SingleView的项目命名为test，然后创建一个自定义的Person对象，具有NSString *name和int age两个属性。
Person.h:
#import <Foundation/Foundation.h> @interface Person : NSObject<NSCopying,NSCoding> @property(copy,nonatomic)NSString *name; @property(assign,nonatomic) int age; @end
Person.m:
#import "Person.h" @implementation Person -(id)copyWithZone:(NSZone *)zone { Person *p = [[Person alloc] init]; //拷贝函数不需要release,这里用autorelease会报错 p.name = [self.name copy]; p.age = self.age; return p; } //实现NSCoding协议 -(void)encodeWithCoder:(NSCoder *)aCoder { [aCoder encodeObject:self.name forKey:@"name"]; [aCoder encodeInt:self.age forKey:@"age"]; //这儿要根据不同的类型来写encode的类型 } //反序列化提取成员变量 -(id)initWithCoder:(NSCoder *)aDecoder { if (self = [super init]) { if (aDecoder == nil) { return self; } self.name = [aDecoder decodeObjectForKey:@"name"]; self.age = [aDecoder decodeIntForKey:@"age"]; //这儿也是，如果是int类型就写decodeIntForKey } return self; } -(NSString *)description { return [NSString stringWithFormat:@"%@,%d",self.name,self.age]; } @end
2.创建一个ViewController来实现数据的的保存
ViewController.h:
#import <UIKit/UIKit.h>
#import "Person.h"
@interface DXWViewController : UIViewController
@property(nonatomic,retain)NSArray *Array;
@property(nonatomic,retain)Person *per;
@end
ViewController.m:
#import "DXWViewController.h"
#define kSaveKeyMarkerLines (@"person")
@interface DXWViewController ()
@end
@implementation DXWViewController
-(NSString *)getPath
{
//用来获得Document地址
NSArray *arr = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);//注意：这里是NSDocument不是NSDocumentation,特别注意
NSLog(@"%@",arr);
//在地址上增加文件
NSString *path = [arr[0] stringByAppendingPathComponent:@"Person.plist"];
NSLog(@"%@",path);
return path;
}
//传入可变数组和地址
//序列化数据
- (BOOL)saveMarkers:(NSMutableArray *)markers toFilePath:(NSString *)filePath
{
BOOL f;
NSMutableData *data = [[NSMutableData alloc] init];
NSKeyedArchiver *vdArchiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
[vdArchiver encodeObject:markers forKey:kSaveKeyMarkerLines];
[vdArchiver finishEncoding];
f = [data writeToFile:filePath atomically:YES];
[vdArchiver release];
[data release];
return f;
}
//传入地址，返回可变数组
//反序列化数据
- (NSMutableArray *)loadMarkersFromFilePath:(NSString *)filePath {
NSMutableArray *markers = nil;
if (filePath == nil || [filePath length] == 0 ||
[[NSFileManager defaultManager] fileExistsAtPath:filePath] == NO) {
markers = [[[NSMutableArray alloc] init] autorelease];
} else {
NSData *data = [[NSData alloc] initWithContentsOfFile:filePath];
NSKeyedUnarchiver *vdUnarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];
markers = [vdUnarchiver decodeObjectForKey:kSaveKeyMarkerLines];
NSLog(@"++++%@",markers);
[vdUnarchiver finishDecoding];
[vdUnarchiver release];
[data release];
}
return markers;
}
- (void)viewDidLoad
{
[super viewDidLoad];
Person *p1 = [[Person alloc] init];
p1.name = @"dingxiaowei";
p1.age = 22;
Person *p2 = [[Person alloc] init];
p2.name = @"wangning";
p2.age = 33;
self.Array = [NSArray arrayWithObjects:p1,p2, nil];
//保存到文件
[self saveMarkers:self.Array toFilePath:[self getPath]];
//从文件中获取数据
NSMutableArray *arr = [self loadMarkersFromFilePath:[self getPath]];
NSLog(@"归档后提取的数据:\n%@",arr);
}
@end
如何寻找创建在沙盒中的文件？
点击一下mac机上的前往功能菜单->然后按下Alt键，会跳出一个资源库的一个隐藏文件->Application Support->iPhone Simulator->6.1(看你当前运行的模拟器的版本)->Applications->对应的文件->Documents->xxx.plist
Demo源码：
http://download.csdn.net/detail/s10141303/6013361
运行结果：
2013-08-26 14:04:47.101 test[1442:c07]归档后提取的数据:
(
"dingxiaowei,22",
"wangning,33"
)
