01-文件管理器
1 #import <Foundation/Foundation.h>
2 #import "User.h"
3
4 int main(int argc, const char * argv[])
5 {
6
7 @autoreleasepool {
8
9
10 //1.文件管理器
11 NSFileManager * f1 = [NSFileManager defaultManager];
12 NSLog(@"%p",f1);
13
14 NSFileManager * f2 = [NSFileManager defaultManager];
15 NSLog(@"%p",f2);
16
17 NSFileManager * f3 = [[NSFileManager alloc] init];
18 NSLog(@"f3 %p",f3);
19
20 NSFileManager * f4 = [NSFileManager defaultManager];
21 NSLog(@"%p",f4);
22
23 //在整个程序没有退出之前,只需要创建一次,我们就可以把它写成单利模式
24 //简单的单例模式
25 User * u1 = [User defaultUser];
26 u1.age = 10;
27
28
29 NSLog(@"u1 %p",u1);
30
31
32 User * u2 = [User defaultUser];
33
34 NSLog(@"u2 %p age = %d",u2,u2.age);
35
36 User * u3 = [[User alloc] init];
37
38 NSLog(@"u3 %p",u3);
39
40 //1.组合模式,(聚合模式)
41 //2.单利模式
42 //3.策略模式(封装变化点),block
43 //4.向上抽象 (protocol(协议))
44 //5.享元设计模式(NSString池原理)
45 }
46 return 0;
47 }
1 #import <Foundation/Foundation.h> 2 3 @interface User : NSObject 4 5 @property (nonatomic,assign)int age; 6 7 + (User *)defaultUser; 8 9 @end
1 #import "User.h"
2
3 @implementation User
4
5 //静态变量,整个程序运行完成的时候才会被释放掉,mian函数运行完成
6 static User * instance = nil;
7
8 + (User *)defaultUser
9 {
10 // return [[self alloc] init];
11
12 if (instance == nil)
13 {
14 instance = [[self alloc] init];
15 }
16 return instance;
17
18 }
19
20 @end
02-获取文件属性
1 #import <Foundation/Foundation.h>
2
3 int main(int argc, const char * argv[])
4 {
5
6 @autoreleasepool {
7
8 /*
9 NSString * str = @"www.itcast.cn";
10 NSError * error;
11 BOOL isWriteSuccess = [str writeToFile:@"/Users/aplle/Desktop/test.txt" atomically:YES encoding:NSUTF8StringEncoding error:&error];
12 if (isWriteSuccess)
13 {
14 NSLog(@"创建成功");
15 }
16 else
17 {
18 NSLog(@"error %@",error);
19 }
20 */
21
22 //1.获取文件管理器
23 NSFileManager * fileManager = [NSFileManager defaultManager];
24 NSString * path = @"/Users/aplle/Desktop/test.txt";
25 NSError * error;
26 NSDictionary * dic = [fileManager attributesOfItemAtPath:path error:&error];
27
28
29 NSLog(@"dic %@",dic);
30
31 if (error == nil)
32 {
33 NSDate * date = [dic objectForKey:NSFileCreationDate];
34 NSString * size = [dic objectForKey:NSFileSize];
35 NSLog(@" date = %@, size = %@",date,size);
36 }
37 }
38 return 0;
39 }
03-获取目录下的文件与子目录列表
1 #import <Foundation/Foundation.h>
2
3 int main(int argc, const char * argv[])
4 {
5
6 @autoreleasepool {
7
8 /*
9 //1.
10 NSFileManager * fileManager = [NSFileManager defaultManager];
11 NSString * path = @"/Users/aplle/Desktop/装机";
12 NSError * error;
13
14 //只能够火的目标目录下,第一级目录
15 NSArray * array = [fileManager contentsOfDirectoryAtPath:path error:&error];
16 NSLog(@"array %@",array);
17 */
18
19 //2
20 NSFileManager * fileManager = [NSFileManager defaultManager];
21 NSString * path = @"/Users/aplle/Desktop/other";
22 NSError * error;
23 //能够逐级的获得所有子集的目录
24 NSArray * array = [fileManager subpathsOfDirectoryAtPath:path error:&error];
25 NSLog(@"array %@",array);
26
27
28
29
30
31 }
32 return 0;
33 }
04-管理目录
1 #import <Foundation/Foundation.h>
2
3 int main(int argc, const char * argv[])
4 {
5
6 @autoreleasepool {
7
8 /*
9 //1创建目录
10 NSFileManager * fileManager = [NSFileManager defaultManager];
11 NSString * path = @"/Users/aplle/Desktop/myfolder/aaa";
12 NSError * error;
13
14 //withIntermediateDirectories YES 逐级创建文件夹,NO表示只能够创建一级目录
15
16 BOOL isCreateSuccess = [fileManager createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:&error];
17 if (isCreateSuccess)
18 {
19 NSLog(@"创建成功");
20 }
21 else
22 {
23 NSLog(@"error %@",error);
24 }
25 */
26
27 //2 移动目录 移动就是剪切操作
28 /*
29 NSFileManager * fileManager = [NSFileManager defaultManager];
30 NSString * path = @"/Users/aplle/Desktop/myfolder";
31 NSString * pathTo = @"/Users/aplle/Desktop/newmyfolder";
32 NSError * error ;
33 BOOL isMoveSuccess = [fileManager moveItemAtPath:path toPath:pathTo error:&error];
34 if (isMoveSuccess)
35 {
36 NSLog(@"移动成功");
37 }
38 else
39 {
40 NSLog(@"error %@",error);
41 }
42 */
43
44 //3.删除
45 /*
46 NSFileManager * fileManager = [NSFileManager defaultManager];
47 NSString * path = @"/Users/aplle/Desktop/newmyfolder";
48 NSError * error;
49 BOOL isRemoveSuccess = [fileManager removeItemAtPath:path error:&error];
50 if (isRemoveSuccess)
51 {
52 NSLog(@"删除成功");
53 }
54 else
55 {
56 NSLog(@"erro %@",error);
57 }
58 */
59
60 //4.拷贝文件
61 NSFileManager * fileManager = [NSFileManager defaultManager];
62 NSString * path = @"/Users/aplle/Desktop/myfolder";
63 NSString * pathTo = @"/Users/aplle/Desktop/newmyfolder";
64 NSError * error;
65 BOOL isCopySuccess = [fileManager copyItemAtPath:path toPath:pathTo error:&error];
66 if(isCopySuccess)
67 {
68 NSLog(@"拷贝成功");
69 }
70 else
71 {
72 NSLog(@"error %@",error);
73 }
74
75 }
76 return 0;
77 }05-管理文件
1 #import <Foundation/Foundation.h>
2
3 int main(int argc, const char * argv[])
4 {
5
6 @autoreleasepool {
7
8 //1.获得文件
9 //mp3.mp4 rmvb mkv pdf doc txt
10 /*
11 NSString * path = @"/Users/aplle/Desktop/屏幕快照 .png";
12 NSData * data = [NSData dataWithContentsOfFile:path];
13 NSLog(@"%ld",data.length);
14
15 NSFileManager * fileManager = [NSFileManager defaultManager];
16 NSString * pathTo = @"/Users/aplle/Desktop/屏幕快照副本.png";
17
18 BOOL isCreateSuccess = [fileManager createFileAtPath:pathTo contents:data attributes:nil];
19
20 if (isCreateSuccess)
21 {
22 NSLog(@"创建成功");
23 }
24 else
25 {
26 NSLog(@"创建失败");
27 }
28 */
29
30 /*
31 //2.移动文件 相当于剪切操作
32 NSFileManager * fileManager = [NSFileManager defaultManager];
33 NSString * path = @"/Users/aplle/Desktop/屏幕快照 .png";
34 NSString * pathTo = @"/Users/aplle/Desktop/newmyfolder/屏幕屏幕.png";
35 NSError * error;
36 BOOL ismoveSuccess = [fileManager moveItemAtPath:path toPath:pathTo error:&error];
37 if (ismoveSuccess)
38 {
39 NSLog(@"移动成功");
40 }
41 else
42 {
43 NSLog(@"error %@",error);
44 }
45 */
46
47 NSFileManager * fileManager = [NSFileManager defaultManager];
48 NSString * path = @"/Users/aplle/Desktop/屏幕快照副本.png";
49 NSError * error;
50 BOOL isremove = [fileManager removeItemAtPath:path error:&error];
51 if (isremove)
52 {
53 NSLog(@"删除成功");
54 }
55 else
56 {
57 NSLog(@"error %@",error);
58 }
59
60 }
61 return 0;
62 }
06-使用NSData处理数据
1 #import <Foundation/Foundation.h>
2
3 int main(int argc, const char * argv[])
4 {
5
6 @autoreleasepool {
7
8 //音频文件,文本文件,视频文件就必须使用NSData数据类
9 /*
10 NSString * str = @"www.itcast.cn";
11 NSError * error;
12 [str writeToFile:@"/Users/aplle/Desktop/text.txt" atomically:YES encoding:NSUTF8StringEncoding error:&error];
13 */
14 /*
15 NSString * path = @"/Users/aplle/Desktop/text.txt";
16 //把目标文件加载到内存中.
17 //NSData 是不可变长度的Data类型,只能够通过一次加载完成所有的数据
18 NSData * data = [NSData dataWithContentsOfFile:path];
19
20 NSLog(@"data length %ld",data.length);
21 NSString * pathTo = @"/Users/aplle/Desktop/nextext.txt";
22 //把加载到内存中的文件,写入到指定的位置
23 BOOL isWriteSuccess = [data writeToFile:pathTo atomically:YES];
24
25 if (isWriteSuccess)
26 {
27 NSLog(@"写入成功");
28 }
29 else
30 {
31 NSLog(@"写入失败");
32 }
33 */
34
35 //当需要把多个NSData数据拼接成一个数据存储的时候,就要想到使用NSMutableData这个类型
36 NSString * str1 = @"好好学习";
37 NSString * str2 = @"天天向上";
38 NSString * str3 = @"今天休息";
39
40 NSMutableData * muData = [[NSMutableData alloc] init];
41
42 NSData * d1 = [str1 dataUsingEncoding:NSUTF8StringEncoding];
43 NSData * d2 = [str2 dataUsingEncoding:NSUTF8StringEncoding];
44 NSData * d3 = [str3 dataUsingEncoding:NSUTF8StringEncoding];
45
46 //appendData 能够把nsdata对象加入到 muData对象中
47 [muData appendData:d1];
48 [muData appendData:d2];
49 [muData appendData:d3];
50
51 NSString * path = @"/Users/aplle/Desktop/传智播客校训.txt";
52 //NSMutableData是继承至NSData的所以可以调用writeToFile 把数据写入到一个指定的目录下
53 BOOL iswriteSucess = [muData writeToFile:path atomically:YES];
54 if (iswriteSucess)
55 {
56 NSLog(@"创建成功");
57 }
58 else
59 {
60 NSLog(@"创建失败");
61 }
62
63
64
65
66
67 }
68 return 0;
69 }
时间： 2024-07-31 00:46:00