提问人：SWAMY CHUNCHU 提问时间：10/21/2016 更新时间：10/24/2016 访问量：2947
选择图像后，如何在iOS中本地保存图像
after picking the image how save images locally in ios
答：
1赞
Tejas Patel
10/21/2016
#1
您可以在 NSUserDefaults 中保存图像，如下所示：
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
UIImage *chosenImage = info[UIImagePickerControllerEditedImage];
if(!self.phto_arr_)
{
self.phto_arr_ = [[NSMutableArray alloc] init];
}
[self.phto_arr_ addObject: chosenImage];
NSData *encodedObject = [NSKeyedArchiver archivedDataWithRootObject:self.phto_arr_];
[[NSUserDefaults standardUserDefaults] setObject: encodedObject forKey:@"images"];
[[NSUserDefaults standardUserDefaults] synchronize];
[picker dismissViewControllerAnimated:YES completion:NULL];
}
0赞
SKD
10/21/2016
#2
是的，您可以将图像保存在文档目录中，并将图像文件名保存在数组中，然后从文档目录中检索该图像。
// For error information
NSError *error;
NSFileManager *fileMgr = [NSFileManager defaultManager];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0]; // Get documents folder
NSString *dataPath = [documentsDirectory stringByAppendingPathComponent:@"/YOUR_IMG_FOLDER"];
if (![fileMgr fileExistsAtPath:dataPath])
[[NSFileManager defaultManager] createDirectoryAtPath:dataPath withIntermediateDirectories:NO attributes:nil error:&error]; //Create folder
//Get the current date and time and set as image name
NSDate *now = [NSDate date];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.dateFormat = @"yyyy-MM-dd_HH-mm-ss";
[dateFormatter setTimeZone:[NSTimeZone systemTimeZone]];
NSString *gmtTime = [dateFormatter stringFromDate:now];
NSLog(@"The Current Time is :%@", gmtTime);
NSData *imageData = UIImageJPEGRepresentation(_postImage, 0.5); // _postImage is your image file and you can use JPEG representation or PNG as your wish
int imgSize = imageData.length;
////NSLog(@"SIZE OF IMAGE: %.2f Kb", (float)imgSize/1024);
NSString *imgfileName = [NSString stringWithFormat:@"%@%@", gmtTime, @".jpg"];
// File we want to create in the documents directory
NSString *imgfilePath= [dataPath stringByAppendingPathComponent:imgfileName];
// Write the file
[imageData writeToFile:imgfilePath atomically:YES];
**// Keep your Image file name into an mutable array here OR you can saved the array in a UserDefaults**
然后从文档目录中检索，从迭代数组中检索。
//Get image file from sand box using file name and file path
NSString *stringPath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0]stringByAppendingPathComponent:@"YOUR_IMG_FOLDER"];
stringPath = [stringPath stringByAppendingPathComponent:imgFile]; // imgFile to get from your array, where you saved those image file names
UIImage *image = [UIImage imageWithContentsOfFile:stringPath];
谢谢。。。祝您编码愉快。
评论
0赞
SWAMY CHUNCHU
10/25/2016
你能解释一下吗，请一点混淆如何将图像一一添加到数组中，如何在 TableView 中显示
0赞
SWAMY CHUNCHU
10/25/2016
从相机捕获图像
0赞
SKD
10/25/2016
拍摄图像后，只需保存到doc.目录，并将文件名保存在数据库中即可。然后从 db 中检索所有文件名并用于表集。在 cellForRowAtIndexPath 中，获取文件名并从文档目录中检索，设置到图像视图中
0赞
G.Anushiya
10/24/2016
#3
请尝试以下代码： 假设你也要显示图像名称，请使用此代码，
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
chosenImage = info[UIImagePickerControllerOriginalImage];
chosenImage = [UIImage unrotateImage:chosenImage];
addGalleryImageview.image = chosenImage;
isCameraOn = YES;
NSString* fileName = [NSString stringWithFormat:@"gallery%@",[Utils getDateString]];
imageNamelbl.text = fileName;
[picker dismissViewControllerAnimated:YES completion:NULL];}
- (UIImage*)unrotateImage:(UIImage*)image{
CGSize size = image.size;
UIGraphicsBeginImageContext(size);
[image drawInRect:CGRectMake(0,0,size.width ,size.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;}
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