iOS文件基本操作

iOS沙盒分为以下几个文件夹

1. Document: 程序创建或者应用浏览产生的文件数据

2. Library: 程序的默认设置或者状态信息

3. temp: 临时文件夹，不需要持久化

文件操作API

1. 获取app沙盒中根目录

NSHomeDirectory()

2. 获取app沙盒中Document文件夹

NSString *homePath = NSHomeDirectory();

3. 获取app沙盒中Library文件夹：NSHomeDirectory()

NSArray *searchPatch = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory, NSUserDomainMask, YES );

NSString *path = [searchPatch lastObject]

4. 获取app沙盒中temp文件夹：NSHomeDirectory()

NSArray *libraryPatch = NSSearchPathForDirectoriesInDomains( NSLibraryDirectory, NSUserDomainMask, YES);

NSString *path = [searchPatch lastObject]

5. 字符串URL解析为各个模块

NSString *patch = @"/data/driver/test.png";

NSArray *component = [patch pathComponents];

[patch stringByDeletingLastPathComponent];

[patch stringByAppendingPathComponent:@"test.png"]

6. 创建文件夹

BOOL ret = [fileManager createDirectoryAtPath:testPatch withIntermediateDirectories:NO attributes:nil error:nil];

7. 创建文件

BOOL ret = [content writeToFile:testPatch atomically:YES encoding:NSUTF8StringEncoding error:nil];

8. 检测文件是否存在

NSFileManager *fileManager = [NSFileManager defaultManager];

if ([fileManager fileExistsAtPath:filePatch]) {

NSLog(@"文件已存在");

} else {

NSLog(@"文件不存在");

}

9. 追加文件

NSArray *docPatch = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *testPatch = [[docPatch lastObject] stringByAppendingString:@"test/test.txt"];

NSFileHandle *fileManager = [NSFileHandle fileHandleForUpdatingAtPath:testPatch];

[fileManager seekToEndOfFile];

NSString *str = @"这是追加的内容";

NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding];

[fileManager writeData:data];

[fileManager closeFile];

10. 删除文件

BOOL ret1 = [fileManager removeItemAtPath:testPatch error:nil];