应用沙盒.png
沙盒机构分析.png
- XML属性列表（plist）归档
- Preference（偏好设置）
- NSKeyedArchiver 归档 （NSCoding）
- SQLite3
- Core Data
一、plist存储
- 写入
//第一个参数:搜索的目录
//第二个参数:搜索的范围
//第三个参数:是否展开路径(在ios当中识别~)
NSString *path = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)[0];
NSLog(@"%@",path);
//stringByAppendingPathComponent拼接一个文件路径.自动加一个(/)
NSString *filePath = [path stringByAppendingPathComponent:@"data.plist"];
NSLog(@"%@",filePath);
//把数组保存到沙盒
NSArray *dataArray = @[@"xmg",@10];
//路径是沙盒路径.
[dataArray writeToFile:filePath atomically:YES];
注意： 在plist文件当中是不能够保存自定义的对象
读取
NSString *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];
NSString *filePath = [path stringByAppendingPathComponent:@"data.plist"];
NSArray *dataArray = [NSArray arrayWithContentsOfFile:filePath];
NSLog(@"%@",dataArray);
二、偏好设置
NSUserDefaults它保存也是一个plist.
一些应用都支持偏好设置，比如保存用户名，密码，字体大小等设置，可以通过NSUserDefaults来存取偏好设置。比如，保存用户名，字体大小，是否自动登录。
- 存储
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:@"xmg" forKey:@"name"];
[defaults setInteger:10 forKey:@"age"];
//立马写入到文件当中
[defaults synchronize];
- 读取
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *name = [defaults objectForKey:@"name"];
NSLog(@"name ===%@",name);
NSInteger age = [defaults integerForKey:@"age"];
NSLog(@"%ld",age);
三、NSKeyedArchiver 归档 （NSCoding）
- 创建对象类
@property (nonatomic, strong) NSString *name;
@property (nonatomic, assign) int age;
@property (nonatomic, strong) Dog *dog;
//在保存对象时告诉要保存当前对象哪些属性.
-(void)encodeWithCoder:(NSCoder *)aCoder{
[aCoder encodeObject:self.name forKey:@"name"];
[aCoder encodeInt:self.age forKey:@"age"];
[aCoder encodeObject:self.dog forKey:@"dog"];
}
//当解析一个文件的时候调用.(告诉当前要解析文件当中哪些属性.)
- (instancetype)initWithCoder:(NSCoder *)aDecoder{
//当只有遵守了NSCoding协议时,才有[super initWithCoder]
if (self = [super init]) {
self.name = [aDecoder decodeObjectForKey:@"name"];
self.age = [aDecoder decodeIntForKey:@"age"];
self.dog = [aDecoder decodeObjectForKey:@"dog"];
}
return self;
}
- 存储
Person *per = [[Person alloc] init];
per.name = @"xmg";
per.age = 10;
//获取沙盒目录
NSString *tempPath = NSTemporaryDirectory();
NSString *filePath = [tempPath stringByAppendingPathComponent:@"Person.data"];
NSLog(@"%@",tempPath);
//归档 archiveRootObject会调用encodeWithCoder:
[NSKeyedArchiver archiveRootObject:per toFile:filePath];
- 读取
//获取沙盒目录
NSString *tempPath = NSTemporaryDirectory();
NSString *filePath = [tempPath stringByAppendingPathComponent:@"Person.data"];
//unarchiveObjectWithFile会调用initWithCoder
Person *per = [NSKeyedUnarchiver unarchiveObjectWithFile:filePath];
NSLog(@"%@---%@",per.name,per.dog.name);