文件操作——图片保存到本地

- (void)viewDidLoad {

[super viewDidLoad];

}

- (IBAction)selectedPhoto:(id)sender {

if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {

//创建iamgePickerController对象

UIImagePickerController *ipc = [[UIImagePickerController alloc]init];

//设置sourceType

ipc.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

ipc.delegate = self;

[self presentViewController:ipc animated:YES completion:nil];

}

}

//获取选中的图片

UIImage *orgImage = [info objectForKey:UIImagePickerControllerOriginalImage];

self.photoImageView.image = orgImage;

//图片保存到本地，

/*

数据持久化，永久保存

1.NSUserDefault 保存少量的数据，几张图片，字符串，小量的数组，字典某个对象

2.文件 图片，视频，一个资源就是一个文件

3.数据库，SQLite3

4.CoreData

应用程序的沙盒

1.获取应用程序允许用户操作的document路径

*/

NSString *docPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject];

//2.创建文件路径

NSString *filePath = [docPath stringByAppendingPathComponent:@"name"];

NSLog(@"%@",filePath);

//3.判断文件是否存在

if ([[NSFileManager defaultManager] fileExistsAtPath:filePath] == NO) {

//4,创建文件

[[NSFileManager defaultManager]createFileAtPath:filePath contents:nil attributes:nil];

//5.写入数据将UIImage 转化为二进制数据NSData

NSData *imageData = UIImagePNGRepresentation(orgImage);

[imageData writeToFile:filePath atomically:YES];

//读取数据

NSError *errMsg = nil;

NSData *d = [NSData dataWithContentsOfFile:filePath options:NSDataReadingUncached error:&errMsg];

if (errMsg) {

// NSAssert(errMsg, @"cuole");

NSLog(@"%@",errMsg);

return;

}

//二进制NSData转化为UIImage

UIImage *img = [UIImage imageWithData:d];

}

// //将图片报存到系统相册

// UIImageWriteToSavedPhotosAlbum(orgImage, nil, nil,nil);