IOS之【属性列表】

@implementation
 
- (void)viewDidLoad
{
    [super viewDidLoad];
     
    [self writePerson];
}
 
尝试写Person
// 不能通过writeToFile将一个普通对象写入文件中
// writeToFile会删掉以前存在的文字，创建一个新的文件
- (void)writePerson {
Person *person = [[[Person alloc] init] autorelease];
name = @"JamesWong";
age = 10;
     
    //NSArray *array = [NSArray arrayWithObject:person];
     
    //  注意：第一个参数是NSDocumentDirectory,说明要搜索Documents目录
    // NSUserDomainMask：在应用沙盒中搜索
    //  如果第3个参数写NO：~/Documents
    // 在iOS平台，这个函数返回的数组中只有1个结果
    //NSString *documents = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
     
    NSString *path = [documents stringByAppendingPathComponent:@"array.plist"];
     
NSArray *array = [NSArray arrayWithObjects:@"1", nil];
    [array writeToFile:path atomically:YES];
}
 
将字典写入属性列表文件中
- (void)writeDict {
    NSMutableDictionary *dict = [NSMutableDictionary dictionary];
    [dict setObject:@"JamesWong" forKey:@"name"];
    [dict setObject:[NSNumber numberWithInt:10] forKey:@"age"];
     
    // 获取应用沙盒的根路径
NSString *home = NSHomeDirectory();
    NSString *documents = [home stringByAppendingPathComponent:@"Documents"];
    //  属性列表的默认拓展名是plist
    NSString *path = [documents stringByAppendingPathComponent:@"dict.plist"];
     
    [dict writeToFile:path atomically:YES];
}
 
从属性列表文件中读取字典
- (void)readDict {
    // 获取应用沙盒的根路径
NSString *home = NSHomeDirectory();
    NSString *documents = [home stringByAppendingPathComponent:@"Documents"];
    //  属性列表的默认拓展名是plist
    NSString *path = [documents stringByAppendingPathComponent:@"dict.plist"];
     
    NSDictionary *dict = [NSDictionary dictionaryWithContentsOfFile:path];
     
NSLog(@"%@", dict);
}
 @end