六：数据存储的五种方式

1 //获取沙盒路径
2     NSString *home = NSHomeDirectory();
3     //获取documents的路径两种方式（其它三个文件夹也能获取）
4     NSString *path = [home stringByAppendingString:@"/documents"];
5     NSString *path1 = [home stringByAppendingPathComponent:@"library/cache"];

1  //获取cache路径，NO表示文件路径前面用“~”表示
2 NSString *cache = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask,YES) lastObject];
3 NSString *doucument = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES) lastObject];
4 //拼接路径
5 NSString *path = [cache stringByAppendingPathComponent:@"abc.plist"];
6 NSString *path1 = [doucument stringByAppendingPathComponent:@"/ce.plist"];
7 //把文件写入文件夹
8 [arr writeToFile:path atomically:YES];
9 [arr writeToFile:path1 atomically:YES];

1 //读取文件
2 NSArray *arr1 =  [NSArray arrayWithContentsOfFile:path];
3 NSLog(@"%@",arr1);

1 //获取对象
2 NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
3 //存储数据
4 [ud setObject:@"abc" forKey:@"这是什么"];
5 [ud setObject:@"cde" forKey:@"俺是"];
6 //读取数据
7 NSString *str = [ud objectForKey:@"俺是"];
8 NSString *str1 = [ud objectForKey:@"这是什么"];
9 NSLog(@"%@---%@",str,str1);

 1 - (void)viewDidLoad {
 2     [super viewDidLoad];
 3     
 4     ZWPerson *p = [[ZWPerson alloc] init];
 5     p.name = @"mc";
 6     p.age = 18;
 7     p.height = 1.88;
 8     NSString *cache = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask,YES) lastObject];
 9     NSString *doucument = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES) lastObject];
10     //拼接路径
11     NSString *path = [cache stringByAppendingPathComponent:@"abc.doc"];
12     NSString *path1 = [doucument stringByAppendingPathComponent:@"/ce.doc"];
13     //存储数据
14     BOOL ar = [NSKeyedArchiver archiveRootObject:p toFile:path];
15     BOOL ar1 = [NSKeyedArchiver archiveRootObject:p toFile:path1];
16     NSLog(@"%d---%d",ar,ar1);
17     //读取数据
18     ZWPerson *p1 = [NSKeyedUnarchiver unarchiveObjectWithFile:path];
19     ZWPerson *p2 = [NSKeyedUnarchiver unarchiveObjectWithFile:path1];
20     NSLog(@"%zd---%@",p1.age,p2.name);
21 }

1 #import "ViewController.h"
2 @interface ZWPerson : ViewController
3 /** 名字 */
4 @property (strong, nonatomic)NSString *name;
5 /** 年龄 */
6 @property (assign, nonatomic)NSInteger age;
7 /** 身高 */
8 @property (assign, nonatomic)double height;
9 @end

 1 #import "ZWPerson.h"
 2 @interface ZWPerson ()
 3 @end
 4 @implementation ZWPerson
 5 //存储的时候调用这个方法
 6 - (void)encodeWithCoder:(NSCoder *)aCoder
 7 {
 8     //存储对象的属性（根据实际需要存储数据）
 9     [aCoder encodeObject:self.name forKey:@"name"];
10     [aCoder encodeInteger:self.age forKey:@"age"];
11     [aCoder encodeDouble:self.height forKey:@"height"];
12 }
13 //读取的时候调用
14 - (instancetype)initWithCoder:(NSCoder *)aDecoder
15 {
16     if (self = [super initWithCoder:aDecoder]) {.
17         //获取对象的属性（根据实际需要获取数据）
18         self.name = [aDecoder decodeObjectForKey:@"name"];
19         self.age = [aDecoder decodeIntegerForKey:@"age"];
20         self.height = [aDecoder decodeDoubleForKey:@"height"];
21     }
22     return self;
23 }
24 @end