使用更先进的浏览器访问效果更佳。

文件操作

admin

// 获取沙盒根路径
+ (NSString *)getHomePath {
    
    return NSHomeDirectory();
}

// 获取tmp路径
+ (NSString *)getTmpPath {
    
    return NSTemporaryDirectory();
}

// 获取Documents路径
+ (NSString *)getDocumentsPath {
    
    NSArray *pathArr = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *path = [pathArr firstObject];
    return path;
}

// 获取Library路径
+ (NSString *)getLibraryPath {
    
    NSArray *pathArr = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
    NSString *path = [pathArr firstObject];
    return path;
}

// 获取LibraryCache路径
+ (NSString *)getLibraryCachePath {
    
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
    NSString *path = [paths firstObject];
    return path;
}

// 检查文件、文件夹是否存在
+ (BOOL)fileExistsAtPath:(NSString *)path isDirectory:(BOOL *)isDir {
    
    NSFileManager *fileManager = [NSFileManager defaultManager];
    BOOL exist = [fileManager fileExistsAtPath:path isDirectory:isDir];
    return exist;
}

// 创建路径
+ (void)createDirectory:(NSString *)path {
    
    NSFileManager *fileManager = [NSFileManager defaultManager];
    BOOL isDir;
    BOOL exist = [fileManager fileExistsAtPath:path isDirectory:&isDir];
    if (!isDir) {
        [fileManager removeItemAtPath:path error:nil];
        exist = NO;
    }
    if (!exist) {
        // 注：直接创建不会覆盖原文件夹
        [fileManager createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:nil];
    }
}

// 创建文件
+ (NSString *)createFile:(NSString *)filePath fileName:(NSString *)fileName {
    
    // 先创建路径
    [self createDirectory:filePath];
    
    // 再创建路径上的文件
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSString *path = [filePath stringByAppendingPathComponent:fileName];
    BOOL isDir;
    BOOL exist = [fileManager fileExistsAtPath:path isDirectory:&isDir];
    if (isDir) {
        [fileManager removeItemAtPath:path error:nil];
        exist = NO;
    }
    if (!exist) {
        // 注：直接创建会被覆盖原文件
        [fileManager createFileAtPath:path contents:nil attributes:nil];
    }
    return path;
}

// 复制 文件or文件夹
+ (void)copyItemAtPath:(NSString *)srcPath toPath:(NSString *)dstPath {
    
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSError *error;
    BOOL result = [fileManager copyItemAtPath:srcPath toPath:dstPath error:&error];
    if (!result && error) {
        NSLog(@"copyItem Err : %@", error.description);
    }
}

// 移动 文件or文件夹
+ (void)moveItemAtPath:(NSString *)srcPath toPath:(NSString *)dstPath {
    
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSError *error;
    BOOL result = [fileManager moveItemAtPath:srcPath toPath:dstPath error:&error];
    if (!result && error) {
        NSLog(@"moveItem Err : %@", error.description);
    }
}

// 删除 文件or文件夹
+ (void)removeItemAtPath:(NSString *)path {
    
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSError *error;
    BOOL result = [fileManager removeItemAtPath:path error:&error];
    if (!result && error) {
        NSLog(@"removeItem Err : %@", error.description);
    }
}

// 获取目录下所有内容
+ (NSArray *)getContentsOfDirectoryAtPath:(NSString *)docPath {
    
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSError *error;
    NSArray *contentArr = [fileManager contentsOfDirectoryAtPath:docPath error:&error];
    if (!contentArr.count && error) {
        NSLog(@"ContentsOfDirectory Err : %@", error.description);
    }
    return contentArr;
}

能直接进行文件读写的数据类型

iOS中有四种简单类型能够直接进行文件读写：字符串NSString/NSMutableString、数组NSArray/NSMutableArray、字典NSDictionary/NSMutableDictionary、二进制数据NSData/NSMutableData。

NSString *string = @"QiShare test string ...";
[string writeToFile:path11 atomically:YES encoding:NSUTF8StringEncoding error:nil];
NSString *readStr = [NSString stringWithContentsOfFile:path11 encoding:NSUTF8StringEncoding error:nil];
NSLog(@"读取文件-字符串： %@", readStr);
    
NSArray *array = @[@"Q", @"i", @"S", @"h", @"a", @"r", @"e"];
[array writeToFile:path33 atomically:YES];
NSArray *readArr = [NSArray arrayWithContentsOfFile:path33];
NSLog(@"读取文件-数组： %@", readArr);
    
NSDictionary *dict = @{@"en":@"QiShare", @"ch":[[FileUtil alloc] init]};
[dict writeToFile:path34 atomically:YES];
NSDictionary *readDict = [NSDictionary dictionaryWithContentsOfFile:path34];
NSLog(@"读取文件-字典： %@", readDict);
    
NSData *data = [@"QiShare test data ..." dataUsingEncoding:NSUTF8StringEncoding];
[data writeToFile:path11 atomically:YES];
NSData *readData = [NSData dataWithContentsOfFile:path11];
NSLog(@"读取文件-二进制： %@", readData);

// NSFileHandle操作文件内容
- (void)testFileHandle {
    
    NSString *docPath = [FileUtil getDocumentsPath];
    NSString *readPath = [docPath stringByAppendingPathComponent:@"read.txt"];
    NSString *writePath = [docPath stringByAppendingPathComponent:@"write.txt"];
    NSData *data = [@"abcdefghijklmnopqrstuvwxyz" dataUsingEncoding:NSUTF8StringEncoding];
    
    NSFileManager *manager=[NSFileManager defaultManager];
    [manager createFileAtPath:readPath contents:data attributes:nil];
    [manager createFileAtPath:writePath contents:nil attributes:nil];
    [data writeToFile:readPath atomically:YES];
    
    // 打开文件 读
    NSFileHandle *readHandle = [NSFileHandle fileHandleForReadingAtPath:readPath];
    NSData *readData = [readHandle readDataToEndOfFile];
    
    // 读取文件中指定位置/指定长度的内容
    [readHandle seekToFileOffset:10];
    readData = [readHandle readDataToEndOfFile];
    NSLog(@"seekToFileOffset:10 = %@", [[NSString alloc] initWithData:readData encoding:NSUTF8StringEncoding]);
    
    [readHandle seekToFileOffset:10];
    readData = [readHandle readDataOfLength:5];
    NSLog(@"seekToFileOffset:10 = %@",[[NSString alloc]initWithData:readData encoding:NSUTF8StringEncoding]);
    [readHandle closeFile];
    
    // 打开文件 写
    NSFileHandle *writeHandle = [NSFileHandle fileHandleForWritingAtPath:writePath];
    // 注：直接覆盖文件原有内容
    [writeHandle writeData:data];
    
    // 注：覆盖了指定位置/指定长度的内容
    [writeHandle seekToFileOffset:2];
    [writeHandle writeData:[@"CDEFG" dataUsingEncoding:NSUTF8StringEncoding]];
    
    [writeHandle seekToEndOfFile];
    [writeHandle writeData:[@"一二三四五六" dataUsingEncoding:NSUTF8StringEncoding]];
    [writeHandle closeFile];
}