How to save URL images to a gallery in IOS - ios

Question

I have an array of images coming from sever. I have a button to save it to gallery. The images coming from server are in url form. Now i want to download the image which i select from an array. I have a button when then image opens in larger view, but the code is used is not working.
Code,
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
NSArray *arrayOfImages = [userDefaults objectForKey:#"property_images"];
NSLog(#"GGG %#",arrayOfImages);
self.imagesData=[[NSArray alloc]init];
self.imagesData = arrayOfImages;
NSString *docsDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES) objectAtIndex:0];
for (UIImageView *imageViewToSave in self.imagesData){
NSInteger tag = imageViewToSave.tag;
UIImage *image = imageViewToSave.image;
NSString *imageName = [NSString stringWithFormat:#"Image%li.png",(long)tag];
NSString *imagePath = [docsDir stringByAppendingPathComponent:imageName];
// Log the image and path being saved. If either of these are nil, nothing will be written.
NSLog(#"Saving %# to %#", image, imagePath);
[UIImagePNGRepresentation(image) writeToFile:imagePath atomically:NO];
}
NSLog(#"Save Button Pressed");
This is how we can show image on tap gesture,
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
NSArray *arrayOfImages = [userDefaults objectForKey:#"property_images"];
NSLog(#"GGG %#",arrayOfImages);
self.imagesData=[[NSArray alloc]init];
self.imagesData = arrayOfImages;
NSLog(#"Image Array is %#",_imagesData);
//dispatch_group_t group = dispatch_group_create();
for(int i=0; i<self.imagesData.count;i++){
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(CGRectGetWidth(self.view.frame) * i, 0, CGRectGetWidth(self.view.frame), CGRectGetHeight(self.scrollView.frame))];
imageView.contentMode = UIViewContentModeScaleAspectFill;
[imageView sd_setImageWithURL:[NSURL URLWithString:[self.imagesData objectAtIndex:i]]
placeholderImage:[UIImage imageNamed:#"launch.png"]];
// imageView.image = [UIImage imageNamed:[self.imagesData objectAtIndex:i]];
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:#selector(expandImage:)];
tap.numberOfTapsRequired = 1;
imageView.tag = i;
NSLog(#"KK %ld",imageView.tag);
[imageView setUserInteractionEnabled:YES];
[imageView addGestureRecognizer:tap];
[self.scrollView addSubview:imageView];
// dispatch_group_enter(group);
[imageView sd_setImageWithURL:[NSURL URLWithString:[self.imagesData objectAtIndex:i]] placeholderImage:nil options:SDWebImageHighPriority completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
//dispatch_group_leave(group);
}];
_fullImage.hidden=NO;
_fullView.hidden=NO;
}
The method for expand is this,
-(void)expandImage:(UITapGestureRecognizer*)recogniser
{
// _fullImage.image = [UIImage imageNamed:[self.imagesData objectAtIndex:recogniser.view.tag]];
[_fullImage sd_setImageWithURL:[NSURL URLWithString:[self.imagesData objectAtIndex:recogniser.view.tag]]
placeholderImage:[UIImage imageNamed:#"launch.png"]];
NSLog(#"RRR %#",self.imagesData);
NSLog(#"TTT %ld",recogniser.view.tag);
}

Answer 1

You can use this function:
UIImageWriteToSavedPhotosAlbum(UIImage *image,
id completionTarget,
SEL completionSelector,
void *contextInfo);
completionTarget, completionSelector and contextInfo all notified when the UIImage is done saving if not use this all then you can pass nil.
like.
UIImageWriteToSavedPhotosAlbum(your UIImage, nil, nil, nil);