NSFileManager*fileManager = [[NSFileManager alloc] init];
NSString *pathDocuments = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
//缩略图路径
createPath = [NSString stringWithFormat:@"%@/ThumbnailImage", pathDocuments];
//原图路径
createDir = [NSString stringWithFormat:@"%@/OriginalImage", pathDocuments];
// 判断文件夹是否存在，如果不存在，则创建
if (![[NSFileManager defaultManager] fileExistsAtPath:createPath]) {
[fileManager createDirectoryAtPath:createPath withIntermediateDirectories:YES attributes:nil error:nil];
[fileManager createDirectoryAtPath:createDir withIntermediateDirectories:YES attributes:nil error:nil];
} else {
NSLog(@"FileDir is exists.");
}