将文件（图片为例子）保存到 自己指定的沙盒文件夹中 并取出来 待用

/*________保存图片到沙河路径文件夹_____________**littleSun_zheng**/

//先把图片转成NSDataNSData*data  =UIImageJPEGRepresentation(image,.000000005);

//文件管理器NSFileManager*fileManager = [NSFileManagerdefaultManager];

//拼接要存放东西的文件夹NSString*pathDocuments = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES)objectAtIndex:0];

   NSString*createPath = [NSStringstringWithFormat:@"%@/EcmChatMyPic", pathDocuments];

//判断文件夹是否存在，如果不存在，则创建if(![[NSFileManagerdefaultManager]fileExistsAtPath:createPath])

{

//如果没有就创建这个 想创建的文件夹   （）

[fileManager

createDirectoryAtPath:createPathwithIntermediateDirectories:YESattributes:nilerror:nil];

//然后保存

NSString* DocumentsPath = [NSHomeDirectory()stringByAppendingPathComponent:@"Documents/EcmChatMyPic"];

NSString*imgFileName = [NSStringstringWithFormat:@"/%@.jpg",fileName];

[fileManager

createFileAtPath:[DocumentsPath stringByAppendingString:imgFileName]contents:data attributes:nil];

}

else{//文件夹存在   直接保存NSString* DocumentsPath = [NSHomeDirectory()stringByAppendingPathComponent:@"Documents/EcmChatMyPic"];

NSString*imgFileName = [NSStringstringWithFormat:@"/%@.jpg",fileName];

[fileManager

createFileAtPath:[DocumentsPath stringByAppendingString:imgFileName]contents:data attributes:nil];

}

//存完之后 接着就取出来 发送NSString* DocumentsPath = [NSHomeDirectory()stringByAppendingPathComponent:@"Documents/EcmChatMyPic"];

NSString*imgFileName = [NSStringstringWithFormat:@"/%@.jpg",fileName];

NSString* filePath = [[NSString alloc] initWithFormat:@"%@%@",DocumentsPath,imgFileName];

//取出图片 等待 你的使用

   UIImage*img = [UIImage imageWithContentsOfFile:filePath];