iOS zip file Unzipping code issue - ios

Question

I want to unzip a zip file downloaded from web but my issue is the zip file is not unzipping in if-else statement.
Is it wrong anything if it is then kindly guide me.
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_async(queue, ^{
NSURL *url = [NSURL URLWithString:#"http://www.icodeblog.com/wp-content/uploads/2012/08/zipfile.zip"];
NSError *error = nil;
// 2
NSData *data = [NSData dataWithContentsOfURL:url options:0 error:&error];
if(!error)
{
// 3
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *path = [paths objectAtIndex:0];
NSString *zipPath = [path stringByAppendingPathComponent:#"zipfile.zip"];
[data writeToFile:zipPath options:0 error:&error];
if(!error)
{
// TODO: Unzip
ZipArchive *za = [[ZipArchive alloc] init];
// 1
if ([za UnzipOpenFile: zipPath]) {
// 2
BOOL ret = [za UnzipFileTo: path overWrite: YES];
if (NO == ret){} [za UnzipCloseFile];
// 3
NSString *imageFilePath = [path stringByAppendingPathComponent:#"photo.png"];
NSString *textFilePath = [path stringByAppendingPathComponent:#"text.txt"];
NSData *imageData = [NSData dataWithContentsOfFile:imageFilePath options:0 error:nil];
UIImage *img = [UIImage imageWithData:imageData];
NSString *textString = [NSString stringWithContentsOfFile:textFilePath
encoding:NSASCIIStringEncoding error:nil];
// 4
dispatch_async(dispatch_get_main_queue(),^{
self.imageView.image = img;
self.label.text = textString;
});
}
else
{
NSLog(#"Error saving file %#",error);
}
}
else
{
NSLog(#"Error downloading zip file: %#", error);
}
}
});

Answer 1

As per your code debugging
1) NSData *data = [NSData dataWithContentsOfURL:url options:0 error:&error];
data is "nil"
by adding in plist below lines of code
<key>NSAppTransportSecurity</key>
<dict>
<key>NSAllowsArbitraryLoads</key><true/>
</dict>
you will get expected output