Download an image to local storage in device IOS7 - ios

Question

Hi in my application I have image which change every day as per the date now i want to give download option for the user like they have to download by clicking button and they can see in there device. I'm searching for long time to achieve this task but not able get the proper solution please tell me how to achieve this one.
My ImageView code.
- (void)viewDidLoad
{
[super viewDidLoad];
//this is url which gives the date has a echo
NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:[NSURL URLWithString:#"url"]];
[request setHTTPMethod:#"GET"];
[request setValue:#"application/json;charset=UTF-8" forHTTPHeaderField:#"content-type"];
NSError *err;
NSURLResponse *response;
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&err];
NSString *resSrt = [[NSString alloc]initWithData:responseData encoding:NSASCIIStringEncoding];
//This is for Response
// here I'm connecting the date to my url do display the image
NSString *imgstr=[NSString stringWithFormat:#"url",resSrt];
//assign your image view name
imageview.image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat:#"%#",imgstr] ]]];
}
I have used the above to do display the image now to want to user download the image by clicking the download button to localstorage of the device please tell me how to achieve this.
Thanks.

Answer 1

First download the image synchronously and save it in documents folder, then show it over image view.
NSURL *url = [NSURL URLWithString: #"url"];
NSString *imagePath = [DOCUMENTS_PATH stringByAppendingPathComponent:#"some name"];
NSError *error = nil;
NSData *imageData = [NSData dataWithContentsOfURL:url options:NSDataReadingUncached error: &error];
if (!error) {
[imageData writeToFile:imagePath atomically:YES];
}
Then give this image to the image view
imageview.image = [UIImage imageWithContentsOfFile:[NSString stringWithFormat:#"%#/some name", DOCUMENTS_PATH]];