Swift&OC 文件夹和文件的详细操作
在iOS开发我们会遇到文件、音频、视频等等下载后本地存储的情况,这时对读文件,写文件就显得很重要,对文件夹以及文件中的文件的操作,这时就可以使用NSFileManager(FileManager)或NSFileHandle(FileHandle)来实现。下面会用OC和Swift的对比来实现对文件和文件夹的操作
-
文件管理器(NSFileManager/FileManager):此类主要是对文件进行的操作(创建/删除/改名等)以及文件信息的获取。
-
文件连接器(NSFileHandle/FileHandle):此类主要是对文件内容进行读取和写入操作。
一、沙盒以及组成部分
iOS应用程序只能对自己创建的文件系统读取文件,这个"独立","封闭","安全"的空间,称之为沙盒。
1.1、Home目录(应用程序包)
-
整个应用程序各文档所在的目录,包含了所有的资源文件和可执行文件
1.2、Documents
-
保存应用运行时生成的需要持久化的数据,iTunes同步设备时会备份该目录
-
需要保存由"应用程序本身"产生的文件或者数据,例如: 游戏进度,涂鸦软件的绘图
-
目录中的文件会被自动保存在 iCloud
-
注意: 不要保存从网络上下载的文件,否则会无法上架!
1.3、tmp
-
保存应用运行时所需要的临时数据或文件,"后续不需要使用",使用完毕后再将相应的文件从该目录删除。
-
应用没有运行,系统也可能会清除该目录下的文件
-
iTunes不会同步备份该目录
-
重新启动手机, tmp 目录会被清空
-
系统磁盘空间不足时,系统也会自动清理
1.4、Library/Cache
-
保存应用运行时生成的需要持久化的数据,iTunes同步设备时不备份该目录。一般存放体积大、不需要备份的非重要数据
-
保存临时文件,"后续需要使用",例如: 缓存的图片,离线数据(地图数据)
-
系统不会清理 cache 目录中的文件
-
就要求程序开发时, "必须提供 cache 目录的清理解决方案"
1.5、Library/Preference
-
保存应用的所有偏好设置,IOS的Settings应用会在该目录中查找应用的设置信息。iTunes
-
用户偏好,使用 NSUserDefault 直接读写!
-
如果想要数据及时写入硬盘,还需要调用一个同步方法 synchronize()
1.6.程序.app,与另三个路径的父路径不同
-
这是应用程序的程序包目录,包含应用程序的本身。由于应用程序必须经过签名,所以您在运行时不能对这个目录中的内容进行修改,否则可能会使应用程序无法启动
二、对文件以及文件夹的操作
2.1、获取各个目录的路径
2.1.1、HomeDirectory
1
2
3
4
|
OC: NSString *filePath = NSHomeDirectory(); Swift: let homePath = NSHomeDirectory() |
2.1.2、Documents
1
2
3
4
5
6
7
8
9
10
11
|
OC: 方法一 NSString * documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES) objectAtIndex: 0 ]; 方法二 NSString * documentsPath = [NSHomeDirectory() stringByAppendingPathComponent:@ "Documents" ]; Swift: 方法 1 let documentsPaths = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true ) let documentsPath = documentPaths[ 0 ] 方法 2 let documentsPath = NSHomeDirectory()+ "/Documents" |
2.1.3、Caches
1
2
3
4
5
6
7
8
9
10
11
|
OC: 方法一 NSString *cachesPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex: 0 ]; 方法二 NSString *cachesPath= [NSHomeDirectory() stringByAppendingPathComponent:@ "/Library/Caches" ]; Swift: 方法 1 let cachePaths = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.cachesDirectory, FileManager.SearchPathDomainMask.userDomainMask, true ) let cachePath = cachePaths.last 方法 2 let cachePath = NSHomeDirectory()+ "/Library/Caches" |
2.1.4、Library
1
2
3
4
5
6
7
8
9
10
11
|
OC: 方法一 NSString * libraryPath = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) objectAtIndex: 0 ]; 方法二 NSString * libraryPath = [NSHomeDirectory() stringByAppendingPathComponent:@ "/Library" ]; Swift: 方法 1 let libraryPaths = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.libraryDirectory, FileManager.SearchPathDomainMask.userDomainMask, true ) let libraryPath = libraryPaths[ 0 ] 方法 2 let libraryPath = NSHomeDirectory()+ "/Library" |
2.1.5、tmp
1
2
3
4
5
6
7
8
9
10
|
OC: 方法一 NSString *tempPath = NSTemporaryDirectory(); 方法二 NSString * tempPath = [NSHomeDirectory() stringByAppendingPathComponent:@ "/tmp" ]; Swift: 方法 1 let tempPath = NSTemporaryDirectory() 方法 2 let tempPath = NSHomeDirectory()+ "/tmp" |
2.2、根据传件来的路径创建文件夹 创建文件目录(蓝色的,文件夹和文件是不一样的)
应用程序目录, Caches、Library、Documents目录文件夹下创建文件夹(蓝色的)
下面以Documents为例创建JKFile为例
以Documents为例创建JKFile为例
-
OC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
|
NSString *filePath=[NSHomeDirectory() stringByAppendingPathComponent:@ "Documents/JKFile" ]; - (NSString *)jKCreateDir:folderName{ NSString *filePath=[NSHomeDirectory() stringByAppendingPathComponent: folderName]; NSFileManager *fileManager = [NSFileManager defaultManager]; BOOL isDir = NO; // fileExistsAtPath 判断一个文件或目录是否有效,isDirectory判断是否一个目录 BOOL existed = [fileManager fileExistsAtPath:filePath isDirectory:&isDir]; if ( !(isDir == YES && existed == YES) ) { // 不存在的路径才会创建 [fileManager createDirectoryAtPath:filePath withIntermediateDirectories:YES attributes:nil error:nil]; } return filePath; } |
Swift:
1
2
3
4
5
6
7
8
9
10
11
12
13
|
let jKFilePath = NSHomeDirectory() + "/Documents/JKFile" ; func jKCreateFolder(folderName: NSString) -> NSString { let fileManager: FileManager = FileManager. default let filePath = "\(folderName)" let exist = fileManager.fileExists(atPath: filePath) // 不存在的路径才会创建 if (!exist) { //withIntermediateDirectories为ture表示路径中间如果有不存在的文件夹都会创建 try ! fileManager.createDirectory(atPath: filePath,withIntermediateDirectories: true , attributes: nil) } return filePath as NSString } |
2.3、删除文件夹(先判断文件夹存不存在)
-
OC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
|
NSString *filePath=[NSHomeDirectory() stringByAppendingPathComponent:@ "Documents/JKFile" ]; - ( void )jKRemovefolder:(NSString *)filePathName { // filePath: 文件/目录的路径 NSFileManager *fileManager = [NSFileManager defaultManager]; NSString *filePath = [NSString stringWithFormat:@ "%@" ,filePathName]; BOOL isDir = NO; // fileExistsAtPath 判断一个文件或目录是否有效,isDirectory判断是否一个目录 BOOL existed = [fileManager fileExistsAtPath:filePath isDirectory:&isDir]; if ( !(isDir == YES && existed == YES) ) { // 不存在的路径才会创建 return ; } //文件夹 [fileManager removeItemAtPath:filePath error:nil]; } |
-
Swift:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
|
let jKFilePath = NSHomeDirectory() + "/Documents/JKFile" ; func jKRemovefolder(folderName: NSString){ let fileManager: FileManager = FileManager. default let filePath = "\(folderName)" let exist = fileManager.fileExists(atPath: filePath) // 查看文件夹是否存在,如果存在就直接读取,不存在就直接反空 if (exist) { try ! fileManager.removeItem(atPath: filePath) } else { // 不存在就不做什么操作了 } } |
2.4、删除文件
-
OC
1
2
3
4
5
6
7
|
- ( void )jKRemovefile:(NSString *)filePathName { // filePath: 文件/目录的路径 NSFileManager *fileManager = [NSFileManager defaultManager]; NSString *filePath = [NSString stringWithFormat:@ "%@" ,filePathName]; //移除文件 [fileManager removeItemAtPath:filePath error:nil]; } |
-
Swift:
1
2
3
4
5
6
|
func jKRemovefile(folderName: NSString){ let fileManager: FileManager = FileManager. default let filePath = "\(folderName)" //移除文件 try ! fileManager.removeItem(atPath: filePath) } |
2.5、深度遍历(搜索文件夹)
-
2.5.1、深度搜索遍历一(subpathsAtPath)深度遍历,会递归遍历子文件夹(包括符号链接,所以要求性能的话用enumeratorAtPath)
获取某个文件下的所有文件的名字
OC
1
2
3
4
5
6
7
8
9
10
|
NSString *filePath = NSHomeDirectory(); -(NSArray *)jKGetAllFileNames:(NSString *)folderName { NSFileManager *fileManager = [NSFileManager defaultManager]; // 取得一个目录下得所有文件名 NSArray *files = [fileManager subpathsAtPath:[self jKCreateFolder:folderName]]; //NSLog(@"pdf名字的数量=%ld 数组=%@",files.count,files); return files; } |
Swift:
1
2
3
4
5
6
7
8
9
10
11
12
13
|
let jKFilePath = NSHomeDirectory(); func jKGetAllFileNames(folderName: NSString) -> NSArray{ let filePath = "\(folderName)" let exist = fileManager.fileExists(atPath: filePath) // 查看文件夹是否存在,如果存在就直接读取,不存在就直接反空 if (exist) { let subPaths = fileManager.subpaths(atPath: folderName as String ) return subPaths! as NSArray } else { return [] } } |
-
2.5.2、深度遍历二,会递归遍历子文件夹(但不会递归符号链接)
OC
1
2
3
4
5
6
7
8
9
|
// folderNmae:文件夹的名字 -(NSArray *)jKDeepSearchEnumeratorAllFileNames:(NSString *)folderName{ NSFileManager *fileManager = [NSFileManager defaultManager]; // 取得一个目录下得所有文件名 NSDirectoryEnumerator *files = [fileManager enumeratorAtPath:[self jKCreateFolder:folderName]]; //NSLog(@"pdf名字的数量=%ld 数组=%@",files.count,files); return files.allObjects; } |
Swift:
1
2
3
4
5
6
7
8
9
10
11
12
|
func jKDeepSearchAllFiles(folderName: NSString) -> NSArray { let filePath = "\(folderName)" let exist = fileManager.fileExists(atPath: filePath) // 查看文件夹是否存在,如果存在就直接读取,不存在就直接反空 if (exist) { let contentsOfPathArray = fileManager.enumerator(atPath: filePath) return contentsOfPathArray!.allObjects as NSArray } else { return [] } } |
2.6、对指定路径执行浅搜索,返回指定目录路径下的文件、子目录及符号链接的列表(只寻找一层)
读取指定目录路径下的文件、子目录及符号链接的列表(只寻找一层)
OC
1
2
3
4
5
6
7
8
9
|
/**对指定路径执行浅搜索,返回指定目录路径下的文件、子目录及符号链接的列表(只寻找一层)*/ NSString *customPath = [NSString stringWithFormat:@ "%@" ,[JKFilePathOperationExtension jKHomeDirectory]]; -(NSArray *)jKShallowSearchAllFiles:(NSString *)filePath{ NSFileManager *fileManager = [NSFileManager defaultManager]; NSArray *contentsOfPathArray = [fileManager contentsOfDirectoryAtPath:filePath error:nil]; return contentsOfPathArray; } |
Swift:
1
2
3
4
5
6
7
8
9
|
/** 对指定路径执行浅搜索,读取指定目录路径下的文件、子目录及符号链接的列表(只寻找一层)*/ let jKFilePath = NSHomeDirectory() func jKShallowSearchAllFiles(folderName: NSString) -> NSArray { let filePath = "\(folderName)" let contentsOfPathArray = try ! fileManager.contentsOfDirectory(atPath: filePath); return contentsOfPathArray as NSArray } |
2.7、判断文件或文件夹是否存在
OC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
|
+(BOOL)jkJudgeFileOrFolderExists:(NSString *)filePathName{ NSFileManager *fileManager = [NSFileManager defaultManager]; NSString *filePath = [NSString stringWithFormat:@ "%@" ,filePathName]; BOOL isDir = NO; // fileExistsAtPath 判断一个文件或目录是否有效,isDirectory判断是否一个目录 BOOL existed = [fileManager fileExistsAtPath:filePath isDirectory:&isDir]; if ( !(isDir == YES && existed == YES) ) { // 不存在的路径 return NO; } else { return YES; } return nil; } |
Swift:
1
2
3
4
5
6
7
8
9
10
11
|
func jkJudgeFileOrFolderExists(folderName: NSString) -> Bool { let filePath = "\(folderName)" let exist = fileManager.fileExists(atPath: filePath) // 查看文件夹是否存在,如果存在就直接读取,不存在就直接反空 if (exist) { return true } else { return false } } |
2.9、创建文件(如:动画乐园.text格式的文本文件)
创建文件(如:动画乐园.text格式的文本文件)
OC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
|
/**folderNmae:文件的名字*/ - (NSString *)jKCreateFile:(NSString *)folderName{ NSString *filePath = [NSString stringWithFormat:@ "%@" ,folderName]; NSFileManager *fileManager = [NSFileManager defaultManager]; BOOL isDir = NO; // fileExistsAtPath 判断一个文件或目录是否有效,isDirectory判断是否一个目录 BOOL existed = [fileManager fileExistsAtPath:filePath isDirectory:&isDir]; if ( !(isDir == YES && existed == YES) ) { // 不存在的路径才会创建 [fileManager createFileAtPath:filePath contents:nil attributes:nil]; } return filePath; } |
Swift:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
|
// fileName:文件的名字(不是文件夹) // baseFilePath: 文件的基础路径 // content: 存进文件的内容 /** 根据传件来的路径创建文件*/ func jKCreateFile(fileName: NSString,baseFilePath: NSString) -> (filePath: NSString,createStatus: Bool) { // NSHomeDirectory():应用程序目录 let filePath = "\(baseFilePath)" + "/\(fileName)" let exist = fileManager.fileExists(atPath: filePath) // 不存在的文件路径才会创建 if (!exist) { //withIntermediateDirectories为ture表示路径中间如果有不存在的文件夹都会创建 let createSuccess = fileManager.createFile(atPath: filePath,contents:nil,attributes:nil) return (filePath as NSString,createSuccess as Bool) } return (filePath as NSString, true ) } |
2.10、可以通过write(to:)方法,可以创建文件并将对象(文件,音频,图片,视频以及数组,字典)都可以写入文件
-
简单对象:iOS中提供四种类型可以直接进行文件存取:NSString(字符串)、NSArray(数组)、NSDictionary(字典)、NSData(数据)(以上类型包括子类)
-
注意:数组(可变与不可变)和字典(可变与不可变)中元素对象的类型,也必须是上述四种,否则不能直接写入文件
-
2.10.1、把NSSString保存到上面“动画乐园.text”的文件里面
NSSString保存到上面“动画乐园.text”的文件里面
OC
1
2
3
4
5
|
// 文件的路径(以文件存在为基础,创建文件请看2.9) NSString * path = [NSHomeDirectory() stringByAppendingPathComponent:@ "Documents/动画乐园.text" ]; NSString *content = @ "动画乐园欢迎你" // 内容写入 [content writeToFile: path atomically:YES encoding:NSUTF8StringEncoding error:nil]; |
Swift:
1
2
3
|
let path = NSHomeDirectory() + "/Documents/动画乐园.text" let info = "动画乐园欢迎你" as String try ! info.write(toFile: path, atomically: true , encoding: String .Encoding.utf8) |
-
2.10.2、把本地图片或者网络图片保存到上面“图片”的文件夹里面
filePath图片的路径是提前存在的(没有的话看上面的去创建文件夹)
把本地图片或者网络图片保存到上面**“图片”**的文件夹里面
OC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
|
// 本地图片的名字 NSString *imageString = @ "testimage.png" ; UIImage *image = [UIImage imageNamed:imageString]; NSData *data = UIImagePNGRepresentation(image); // 图片的存储文件夹 NSString *customPath = [NSString stringWithFormat:@ "%@%@" ,NSHomeDirectory(),@ "/Documents/图片" ]; // 图片的存储路径 imagePath = [NSString stringWithFormat:@ "%@/%@" , customPath, imageString]; [data writeToFile: imagePath atomically:YES]; 网络图片 NSString *customPath = [NSString stringWithFormat:@ "%@/%@" ,[JKFilePathOperationExtension jKDocuments],@ "jk.png" ]; NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:imageStr]]; //转换为图片保存到以上的沙盒路径中 UIImage * currentImage = [UIImage imageWithData:data]; //其中参数0.5表示压缩比例,1表示不压缩,数值越小压缩比例越大 [UIImageJPEGRepresentation(currentImage, 0.5 ) writeToFile:customPath atomically:YES]; |
Swift:
1
2
3
4
|
let filePath = NSHomeDirectory() + "/Documents/图片/testimage.png" let image = UIImage(named: "testimage.png" ) let data:Data = UIImagePNGRepresentation(image!)! try ? data.write(to: URL(fileURLWithPath: filePath)) |
-
2.10.3、把本数组写到文件里面(array.plist的文件是已经存在的基础上)
把本数组写到文件里面(array.plist的文件是已经存在的基础上)
OC
1
2
3
4
5
|
// 创建数组 NSArray *array = @[@ "1" ,@ "2" ,@ "3" ]; // 文件路径(前提是已经存在),创建文件请看上面2.9 NSString *customPath = [NSString stringWithFormat:@ "%@%@" ,NSHomeDirectory(),@ "/Documents/array.plist" ]; [array writeToFile:filePath atomically:YES]; |
Swift
1
2
3
|
let filePath = NSHomeDirectory() + "/Documents/array.plist" let array = NSArray(objects: "我" , "❤️" , "你" ) array.write(toFile: filePath, atomically: true ) |
-
2.10.4、把本字典写到文件里面(dictionary.plist的文件是已经存在的基础上)
把本字典写到文件里面(dictionary.plist的文件是已经存在的基础上)
OC
1
2
3
4
|
NSString *customPath = [NSString stringWithFormat:@ "%@%@" ,NSHomeDirectory(),@ "/Documents/dictionary.plist" ]; // 创建字典 NSDictionary *dict = @{@ "1" :@ "9" ,@ "2" :@ "8" ,@ "3" :@ "7" ,@ "4" :@ "6" }; dict.write(toFile: filePath, atomically: true ) |
Swift
1
2
3
|
let filePath = NSHomeDirectory() + "/Documents/dictionary.plist" let dictionary = NSDictionary(dictionary: [ "name" : "JK" , "age" : "26" ]) dictionary.write(toFile: filePath, atomically: true ) |
2.11、复制文件
复制文件
OC
1
2
3
4
|
NSString *fromPath = [NSString stringWithFormat:@ "%@%@" ,NSHomeDirectory(),@ "/Documents/我的笔记.text" ]; NSString *toPath = [NSString stringWithFormat:@ "%@%@" ,NSHomeDirectory(),@ "/Documents/复制后的笔记.text" ]; NSFileManager *fileManager = [NSFileManager defaultManager]; BOOL isCopySuccess = [fileManager copyItemAtPath: fromPath toPath: toPath error:nil]; |
Swift
1
2
3
4
5
|
let homeDirectory = NSHomeDirectory() let fomePath = homeDirectory + "/Documents/我的笔记.text" let toPath = homeDirectory + "/Documents/复制后的笔记.text" let fileManager1 = FileManager. default try ! fileManager1.copyItem(atPath: fomePath as String , toPath: toPath as String ) |
2.12、移动文件或者文件夹
文件夹或者文件,这里是文件夹JKPdf要提前建好,创建方式看上面
移动文件或者文件夹
OC
1
2
3
4
|
NSString *fromPath = [NSString stringWithFormat:@ "%@%@" ,NSHomeDirectory(),@ "/Documents/JKPdf" ]; NSString *toPath = [NSString stringWithFormat:@ "%@%@" ,NSHomeDirectory(),@ "/tmp/JKPdf" ]; NSFileManager *fileManager = [NSFileManager defaultManager]; BOOL isMoveSuccess = [fileManager moveItemAtPath:fromPath toPath:toPath error:nil]; |
Swift
1
2
3
4
|
let fomePath =NSHomeDirectory() + "/Documents/JKPdf" let toPath = NSHomeDirectory() + "/tmp/JKPdf" let fileManagerMove = FileManager. default try ! fileManagerMove.moveItem(atPath: fromUrl as String , toPath: toUrl as String ) |
2.13、读取文件
-
2.13.1、文件的类型为文本,如 我的笔记.text
OC
1
2
3
4
|
// 拿到我的笔记.text的路径 NSString *customPath = @ "路径" ; // 取出文本的内容 NSString *str = [NSString stringWithContentsOfFile:customPath encoding:NSUTF8StringEncoding error:nil]; |
Swift
1
2
3
4
5
|
let path = NSHomeDirectory() + "/Documents/我的笔记.text" let readHandler = FileHandle(forReadingAtPath: path) let data = readHandler?.readDataToEndOfFile() let readString = String (data: data!, encoding: String .Encoding.utf8) print( "文件内容: \(String(describing: readString))" ) |
-
2.13.2、读取沙盒图片
模仿SDWebImage: 加载图片前先去沙盒寻找,如果有就加载沙盒里的图片,没有的话就加载网络的图片
OC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
/** 读出图片 imageUrl: 图片的链接*/ +( void )jKReadImageWithImageUrl:(NSString *)imageUrl withReadImage:(ReadImage)readImage{ NSString *catchsImageStr = [imageUrl lastPathComponent]; NSFileManager *fileManager = [NSFileManager defaultManager]; NSString *filePath = [NSString stringWithFormat:@ "%@/Library/Caches/JKImage/%@" ,NSHomeDirectory(),catchsImageStr]; // fileExistsAtPath 判断一个文件或目录是否有效 BOOL existed = [fileManager fileExistsAtPath:filePath]; if ( !(existed == YES) ) { // 图片不存在沙盒里,检查文件夹是否存在 NSString *folderPath = [NSString stringWithFormat:@ "%@/Library/Caches/JKImage" ,NSHomeDirectory()]; BOOL isDir = NO; // fileExistsAtPath 判断一个文件或目录是否有效,isDirectory判断是否一个目录 BOOL existedFolder = [fileManager fileExistsAtPath:folderPath isDirectory:&isDir]; if ( !(isDir == YES && existedFolder == YES) ) { // 不存在的文件夹JKImage才会创建 [fileManager createDirectoryAtPath:folderPath withIntermediateDirectories:YES attributes:nil error:nil]; } // 文件夹存在就把图片缓存进去 // 图片不存在 NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:imageUrl]]; //转换为图片保存到以上的沙盒路径中 UIImage * currentImage = [UIImage imageWithData:data]; //其中参数0.5表示压缩比例,1表示不压缩,数值越小压缩比例越大 [UIImageJPEGRepresentation(currentImage, 0.5 ) writeToFile:[NSString stringWithFormat:@ "%@/%@" ,folderPath,catchsImageStr] atomically:YES]; readImage(currentImage,YES); } else { // 图片在沙盒里直接取出 NSData *data = [NSData dataWithContentsOfFile:filePath]; UIImage *image = [UIImage imageWithData:data]; readImage(image,YES); } } |
Swift
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
|
let path = NSHomeDirectory() + "/Documents/2.png" let fileManagerReadImage = FileManager. default let exist = fileManagerReadImage.fileExists(atPath: path) // 不存在直接返回false if (!exist) { print( "存在图片" ) } else { let readHandler = FileHandle(forReadingAtPath: path) let data = (readHandler?.readDataToEndOfFile())! let image = UIImage(data: data) print( "不存在图片" ) } |
2.14、获取文件属性(创建时间,修改时间,文件大小,文件类型等信息)
OC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
|
let docPath = NSHomeDirectory() + "/Documents/我的笔记.text" NSFileManager *fileManager = [NSFileManager defaultManager]; NSDictionary *fileAttributes = [fileManager attributesOfItemAtPath:path error:nil]; if (fileAttributes != nil) { NSNumber *fileSize; NSString *fileOwner, *creationDate; NSDate *fileModDate; //NSString *NSFileCreationDate //文件大小 if ((fileSize = [fileAttributes objectForKey:NSFileSize])) { NSLog(@ "文件的大小= %qi\n" , [fileSize unsignedLongLongValue]); } //文件创建日期 if ((creationDate = [fileAttributes objectForKey:NSFileCreationDate])) { NSLog(@ "文件创建的日期: %@\n" , creationDate); } //文件所有者 if ((fileOwner = [fileAttributes objectForKey:NSFileOwnerAccountName])) { NSLog(@ "Owner: %@\n" , fileOwner); } //文件修改日期 if ((fileModDate = [fileAttributes objectForKey:NSFileModificationDate])) { NSLog(@ "文件修改的日期: %@\n" , fileModDate); } } else { NSLog(@ "该文件不存在" ); } |
Swift
1
2
3
4
5
6
7
|
// 我的笔记.text文本是存在Documents下面的 let path = NSHomeDirectory() + "/Documents/我的笔记.text" let managerGetFile = FileManager. default let attributes = try ? managerGetFile.attributesOfItem(atPath: path) //结果为Dictionary类型 print( "创建时间:\(attributes[FileAttributeKey.creationDate]!)" ) print( "修改时间:\(attributes[FileAttributeKey.modificationDate]!)" ) print( "文件大小:\(attributes[FileAttributeKey.size]!)" ) |
2.15、计算单个或多个文件夹的大小(清理数据常用)
OC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
/** 计算文件夹的大小 folderPath: 文件夹的大小*/ -(NSString *)jKCalculateTheSizeOfTheFolderPath:(NSString *)folderPath{ NSFileManager *fileManager = [NSFileManager defaultManager]; BOOL isExist = [fileManager fileExistsAtPath:folderPath]; if (isExist) { unsigned long long folderSize = 0 ; NSArray *childerFiles=[fileManager subpathsAtPath:folderPath]; if (childerFiles.count != 0 ) { for (NSString *fileName in childerFiles) { NSString *fileAbsolutePath=[folderPath stringByAppendingPathComponent:fileName]; folderSize +=[self jKCalculateTheSizeOfTheFilePath:fileAbsolutePath]; } } else { folderSize = [self jKCalculateTheSizeOfTheFilePath:folderPath]; } NSString *sizeString; if (folderSize >= 1024.0 * 1024.0 ) { sizeString = [NSString stringWithFormat:@ "%.2fMB" ,folderSize / ( 1024.0 * 1024.0 )]; } else if (folderSize >= 1024.0 ){ sizeString = [NSString stringWithFormat:@ "%.fkb" ,folderSize / ( 1024.0 )]; } else { sizeString = [NSString stringWithFormat:@ "%llub" ,folderSize]; } // unsigned long long return sizeString; } else { NSLog(@ "file is not exist" ); return @ "0MB" ; } } /** 计算文件的大小*/ -(unsigned long long)jKCalculateTheSizeOfTheFilePath:(NSString *)filePath{ NSFileManager *fileManager = [NSFileManager defaultManager]; BOOL isExist = [fileManager fileExistsAtPath:filePath]; if (isExist) { unsigned long long fileSize = [[fileManager attributesOfItemAtPath:filePath error:nil] fileSize]; return fileSize; } else { NSLog(@ "file is not exist" ); return 0 ; } } |
Swift
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
/** 计算文件夹或者文件的大小 */ class func getSize(folderPath: String )-> String { if folderPath.count == 0 { return "0MB" as String } let manager = FileManager. default if !manager.fileExists(atPath: folderPath){ return "0MB" as String } var fileSize:Float = 0.0 do { let files = try manager.contentsOfDirectory(atPath: folderPath) for file in files { let path = folderPath + "/\(file)" fileSize = fileSize + fileSizeAtPath(filePath: path) } } catch { fileSize = fileSize + fileSizeAtPath(filePath: folderPath) } print( "大小==\(fileSize)" ) var resultSize = "" if fileSize >= 1024.0 * 1024.0 { resultSize = NSString(format: "%.2fMB" , fileSize/( 1024.0 * 1024.0 )) as String } else if fileSize >= 1024.0 { resultSize = NSString(format: "%.fkb" , fileSize/( 1024.0 )) as String } else { resultSize = NSString(format: "%llub" , fileSize) as String } return resultSize } /** 计算单个文件或文件夹的大小 */ class func fileSizeAtPath(filePath: String ) -> Float { let manager = FileManager. default var fileSize:Float = 0.0 if manager.fileExists(atPath: filePath) { do { let attributes = try manager.attributesOfItem(atPath: filePath) if attributes.count != 0 { fileSize = attributes[FileAttributeKey.size]! as ! Float } } catch { } } return fileSize; } |