由于允许在Documents目录下比较自由的进行文件操作,因此可以进行诸如网络资源的缓存等功能。
1,添加路径目录
NSString *path = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:@"MyOwnDirectory"];
NSFileManager *fileManager = [NSFileManager defaultManager];
if([fileManager fileExistsAtPath:path]){
}else{
[fileManager createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:nil];
}
如果该路径不存在则创建该路径
2,删除指定路径的目录或文件
NSString *temPath = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:@"MyOwnDiretory"];
NSFileManager *fileManager = [NSFileManager defaultManager];
if([fileManager fileExistsAtPath:temPath]){
[fileManager removeItemAtPath:temPath error:nil];
}
上述可以实现清除缓存目录
3,将图片写到Documents/MyOwnDirectory/下
NSData *image_data = [NSData dataWithData:UIImageJPEGRepresentation(image, 1)];
[image_data writeToFile:filePath atomically:YES];
而这个filepath就是指Documents/MyOwnDirectory,可以通过如下方法得到:
NSArray *paths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:fileName];
这个filePath只是Documents/"your file name"如果想要得到/Documents/MyOwnDirectory/"your file name",便需要在documentsDirectory后面添加字符串"MyOwnDirectory/"