iOS的沙盒机制，应用只能访问当前应用目录下的文件内容。应用内所产生的如图像、文件、缓存等内容也都必须存储在自己的沙盒内。
默认情况下，每个沙盒含有3个文件夹：Documents, Library 和 tmp。
其中Library包含Caches、Preferences目录。
(完整路径为:/Users/xxxx/Library/Developer/CoreSimulator/Devices)
沙盒结构
Application：存放程序源文件，上架前经过数字签名，上架后不可修改
Documents：常用目录，iCloud备份目录，存放数据,这里不能存缓存文件,否则上架
不被通过
Library:
&Caches：存放体积大又不需要备份的数据,比如下载的音乐,视频,SDWebImage缓存等
&Preference：设置目录，iCloud会备份设置信息
tmp：存放临时文件，不会被备份，而且这个文件下的数据有可能随时被清除的可能
1,如何获取沙盒根路径
-(void)directoryHome{
NSString *directoryHome=NSHomeDirectory();
NSLog(@"app_home: %@",directoryHome);
}
2,获取Documents目录
-(NSString *)dirDoc{
//[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSLog(@"app_home_doc: %@",documentsDirectory);
return documentsDirectory;
}
3,获取Library目录路径：
//获取Library目录
-(void)dirLib{
//[NSHomeDirectory() stringByAppendingPathComponent:@"Library"];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
NSString *libraryDirectory = [paths objectAtIndex:0];
NSLog(@"app_home_lib: %@",libraryDirectory);
}```
4,获取Cache目录路径：
//获取Cache目录
-(void)dirCache{
NSArray *cacPath = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *cachePath = [cacPath objectAtIndex:0];
NSLog(@"app_home_lib_cache: %@",cachePath);
}```
5,获取Tmp目录路径：
//获取Tmp目录
-(void)dirTmp{
//[NSHomeDirectory() stringByAppendingPathComponent:@"tmp"];
NSString *tmpDirectory = NSTemporaryDirectory();
NSLog(@"app_home_tmp: %@",tmpDirectory);
}```
6,创建文件夹：
//创建文件夹
-(void *)createDir{
NSString *documentsPath =[self dirDoc];
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *testDirectory = [documentsPath stringByAppendingPathComponent:@"test"];
}
创建目录
BOOL res=[fileManager createDirectoryAtPath:testDirectory withIntermediateDirectories:YES attributes:nil error:nil];`
if (res) {
NSLog(@"文件夹创建成功");
}else
NSLog(@"文件夹创建失败");
}```
7,创建文件
//创建文件
-(void *)createFile{
NSString *documentsPath =[self dirDoc];
NSString *testDirectory = [documentsPath stringByAppendingPathComponent:@"test"];
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *testPath = [testDirectory stringByAppendingPathComponent:@"test.txt"];
BOOL res=[fileManager createFileAtPath:testPath contents:nil attributes:nil];
if (res) {
NSLog(@"文件创建成功: %@" ,testPath);
}else
NSLog(@"文件创建失败");
}```
8,写数据到文件
//写文件
-(void)writeFile{
NSString *documentsPath =[self dirDoc];
NSString *testDirectory = [documentsPath stringByAppendingPathComponent:@"test"];
NSString *testPath = [testDirectory stringByAppendingPathComponent:@"test.txt"];
NSString *content=@"测试写入内容！";
BOOL res=[content writeToFile:testPath atomically:YES encoding:NSUTF8StringEncoding error:nil];
if (res) {
NSLog(@"文件写入成功");
}else
NSLog(@"文件写入失败");
}```
9,读文件数据：
//读文件
-(void)readFile{
NSString *documentsPath =[self dirDoc];
NSString *testDirectory = [documentsPath stringByAppendingPathComponent:@"test"];
NSString *testPath = [testDirectory stringByAppendingPathComponent:@"test.txt"];
// NSData *data = [NSData dataWithContentsOfFile:testPath];
// NSLog(@"文件读取成功: %@",[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);
NSString *content=[NSString stringWithContentsOfFile:testPath encoding:NSUTF8StringEncoding error:nil];
NSLog(@"文件读取成功: %@",content);
}```
10,文件属性：
//文件属性
-(void)fileAttriutes{
NSString *documentsPath =[self dirDoc];
NSString *testDirectory = [documentsPath stringByAppendingPathComponent:@"test"];
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *testPath = [testDirectory stringByAppendingPathComponent:@"test.txt"];
NSDictionary *fileAttributes = [fileManager attributesOfItemAtPath:testPath error:nil];
NSArray *keys;
id key, value;
keys = [fileAttributes allKeys];
int count = [keys count];
for (int i = 0; i < count; i++)
{
key = [keys objectAtIndex: i];
value = [fileAttributes objectForKey: key];
NSLog (@"Key: %@ for value: %@", key, value);
}
}```
11,删除文件
//删除文件
-(void)deleteFile{
NSString *documentsPath =[self dirDoc];
NSString *testDirectory = [documentsPath stringByAppendingPathComponent:@"test"];
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *testPath = [testDirectory stringByAppendingPathComponent:@"test.txt"];
BOOL res=[fileManager removeItemAtPath:testPath error:nil];
if (res) {
NSLog(@"文件删除成功");
}else
NSLog(@"文件删除失败");
NSLog(@"文件是否存在: %@",[fileManager isExecutableFileAtPath:testPath]?@"YES":@"NO");
}
