保存数据的一系列方法

1. /*=======================================================
2. NSKeyedArchiver
3. ========================================================*/
4. NSString *str = @"abc";
5. NSString *astr = @"efg";
6. NSArray *Array = [NSArray arrayWithObjects:str, astr, nil];
8. //Save
9. NSString *Path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]; NSString *filename = [Path stringByAppendingPathComponent:@"test"];
10. [NSKeyedArchiver archiveRootObject:Array toFile:filename];
12. str = @"a";
13. astr = @"";
15. //load
16. NSArray *arr = [NSKeyedUnarchiver unarchiveObjectWithFile: filename];
17. str = [arr objectAtIndex:0];
18. astr =  [arr objectAtIndex:1];
20. NSLog(@"str:%@",str);
21. NSLog(@"astr:%@",astr);
25. /*=======================================================
26. NSUserDefaults
27. ========================================================*/
28. NSString *str = @"abc";
29. NSString *astr = @"efg";
30. NSArray *Array = [NSArray arrayWithObjects:str, astr, nil];
32. //Save
33. NSUserDefaults *SaveDefaults = [NSUserDefaults standardUserDefaults];
34. [SaveDefaults setObject:Array forKey:@"SaveKey"];
36. str = @"a";
37. astr = @"";
39. //load
40. Array = [SaveDefaults objectForKey:@"SaveKey"];
41. str = [Array objectAtIndex:0];
42. astr = [Array objectAtIndex:1];
43. NSLog(@"str:%@",str);
44. NSLog(@"astr:%@",astr);
49. /*=======================================================
50. writeToFile:
51. ========================================================*/
52. NSString *str = @"abc";
53. NSString *astr = @"efg";
54. NSArray *Array = [NSArray arrayWithObjects:str, astr, nil];
56. //Save
57. NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
58. NSString *documentsDirectory = [paths objectAtIndex:0];
59. if (!documentsDirectory) {
60.     NSLog(@"Documents directory not found!");
61. }
62. NSString *appFile = [documentsDirectory stringByAppendingPathComponent:@"Savedatas.plist"];
63. [[NSArray arrayWithObjects:Array,nil] writeToFile:appFile atomically:NO];    
66. //load
67. if([[NSFileManager defaultManager] fileExistsAtPath:appFile])
68.     self.SaveDataArray = [NSMutableArray arrayWithContentsOfFile:appFile];        
69. else
70.     self.SaveDataArray = [NSMutableArray arrayWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"Savedatas" ofType:@"plist"]];
71. NSArray *strArray = [self.SaveDataArray objectAtIndex:0];
73. str = [strArray objectAtIndex:0];
74. astr = [strArray objectAtIndex:1];
80. //坛子里的，搬过来。。。。。
81. -(BOOL) writeApplicationData:(NSDictionary *)data  writeFileName:(NSString *)fileName
82. {
83.     NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
84.     NSString *documentsDirectory = [paths objectAtIndex:0];
85.     if (!documentsDirectory) {
86.         NSLog(@"Documents directory not found!");
87.         return NO;
88.     }
89.     NSString *appFile = [documentsDirectory stringByAppendingPathComponent:fileName];
90.     return ([data writeToFile:appFile atomically:YES]);
91. }
93. -(id) readApplicationData:(NSString *)fileName
94. {
95.     NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
96.     NSString *documentsDirectory = [paths objectAtIndex:0];
97.     NSString *appFile = [documentsDirectory stringByAppendingPathComponent:fileName];
98.     NSDictionary *myData = [[[NSDictionary alloc] initWithContentsOfFile:appFile] autorelease];
99.     return myData;
100. }