标签：
| 措施名称 | 描述 |
| -(NSData *)contentsAtPath:path | 从path所代表的文件中读取数据 |
| -(BOOL)createFileAtPath:path contents:(BOOL)data attributes:attr | 将数据写入文件 |
| -(BOOL)removeFileAtPath:path handler:handler | 将path所代表的文件删除 |
| -(BOOL)movePath:from toPath:to handler:handler | 移动或者重命名文件，to所代表的文件不能是已经存在的文件 |
| -(BOOL)copyPath:from toPath:to handler:handler | 复制文件，to所代表的文件不能是已经存在的文件 |
| -(BOOL)contentsEqualAtPath:path1 andPath:path2 | 比较path1和path2所代表的文件 |
| -(BOOL)fileExistsAtPath:path | 检查path所代表的文件是否存在 |
| -(BOOL)isReadableFileAtPath:path | 检查path所代表的文件是否存在、是否可读 |
| -(BOOL)isWritableFileAtPath:path | 检查path所代表的文件是否存在、是否可写 |
| -(NSDictionary *)fileAttributesAtPath:path traverseLink:(BOOL)flag | 获取path所代表的文件属性 |
| -(BOOL)changeFileAttributes:attr atPath:path | 改变文件属性 |
iOS的沙盒机制，应用只能访问自己应用目录下的文件。iOS不像android，没有SD卡概念，不能直接访问图像、视频等内容。iOS应用产生的内容，如图像、文件、缓存内容等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。Library包含Caches、Preferences目录。
-(void)createDirectory{
NSString *documentsPath =[self getDocumentsPath];
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *iOSDirectory = [documentsPath stringByAppendingPathComponent:@"iOS"];
BOOL isSuccess = [fileManager createDirectoryAtPath:iOSDirectory withIntermediateDirectories:YES attributes:nil error:nil];
if (isSuccess) {
NSLog(@"success");
} else {
NSLog(@"fail");
}
}
2、创建文件
-(void)createFile{
NSString *documentsPath =[self getDocumentsPath];
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *iOSPath = [documentsPath stringByAppendingPathComponent:@"iOS.txt"];
BOOL isSuccess = [fileManager createFileAtPath:iOSPath contents:nil attributes:nil];
if (isSuccess) {
NSLog(@"success");
} else {
NSLog(@"fail");
}
}
3、写文件
-(void)writeFile{
NSString *documentsPath =[self getDocumentsPath];
NSString *iOSPath = [documentsPath stringByAppendingPathComponent:@"iOS.txt"];
NSString *content = @"我要写数据啦";
BOOL isSuccess = [content writeToFile:iOSPath atomically:YES encoding:NSUTF8StringEncoding error:nil];
if (isSuccess) {
NSLog(@"write success");
} else {
NSLog(@"write fail");
}
}
4、读取文件内容
-(void)readFileContent{
NSString *documentsPath =[self getDocumentsPath];
NSString *iOSPath = [documentsPath stringByAppendingPathComponent:@"iOS.txt"];
NSString *content = [NSString stringWithContentsOfFile:iOSPath encoding:NSUTF8StringEncoding error:nil];
NSLog(@"read success: %@",content);
}
5、判断文件是否存在
- (BOOL)isSxistAtPath:(NSString *)filePath{
NSFileManager *fileManager = [NSFileManager defaultManager];
BOOL isExist = [fileManager fileExistsAtPath:filePath];
return isExist;
}
6、计算文件大小
- (unsigned long long)fileSizeAtPath:(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;
}
}
7、计算整个文件夹中所有文件大小
- (unsigned long long)folderSizeAtPath:(NSString*)folderPath{
NSFileManager *fileManager = [NSFileManager defaultManager];
BOOL isExist = [fileManager fileExistsAtPath:folderPath];
if (isExist){
NSEnumerator *childFileEnumerator = [[fileManager subpathsAtPath:folderPath] objectEnumerator];
unsigned long long folderSize = 0;
NSString *fileName = @"";
while ((fileName = [childFileEnumerator nextObject]) != nil){
NSString* fileAbsolutePath = [folderPath stringByAppendingPathComponent:fileName];
folderSize += [self fileSizeAtPath:fileAbsolutePath];
}
return folderSize / (1024.0 * 1024.0);
} else {
NSLog(@"file is not exist");
return 0;
}
}
8、删除文件
-(void)deleteFile{
NSString *documentsPath =[self getDocumentsPath];
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *iOSPath = [documentsPath stringByAppendingPathComponent:@"iOS.txt"];
BOOL isSuccess = [fileManager removeItemAtPath:iOSPath error:nil];
if (isSuccess) {
NSLog(@"delete success");
}else{
NSLog(@"delete fail");
}
}
9、移动文件
- (void)moveFileName
{
NSString *documentsPath =[self getDocumentsPath];
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *filePath = [documentsPath stringByAppendingPathComponent:@"iOS.txt"];
NSString *moveToPath = [documentsPath stringByAppendingPathComponent:@"iOS.txt"];
BOOL isSuccess = [fileManager moveItemAtPath:filePath toPath:moveToPath error:nil];
if (isSuccess) {
NSLog(@"rename success");
}else{
NSLog(@"rename fail");
}
}
10、重命名
- (void)renameFileName
{
//通过移动该文件对文件重命名
NSString *documentsPath =[self getDocumentsPath];
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *filePath = [documentsPath stringByAppendingPathComponent:@"iOS.txt"];
NSString *moveToPath = [documentsPath stringByAppendingPathComponent:@"rename.txt"];
BOOL isSuccess = [fileManager moveItemAtPath:filePath toPath:moveToPath error:nil];
if (isSuccess) {
NSLog(@"rename success");
}else{
NSLog(@"rename fail");
}
}
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原文地址：http://www.cnblogs.com/lsa0913/p/5731609.html
