UIAlertView kind of contradicts the UIActivityIndicator - iphone

Question

I'm downloading the images from the online image for cache when offline. When I open application, The image was downloaded all completely before UIAlertView pop. It's finish incorrectly. I want to make the UIAlertView pop before images download. Here there are my code below.
- (void) operatePopupUpdating {
myAlert = [[UIAlertView alloc] initWithTitle:#"Updating database.." message:nil delegate:self cancelButtonTitle:nil otherButtonTitles: nil];
[myAlert show];
UIActivityIndicatorView *indicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
indicator.center = CGPointMake(myAlert.bounds.size.width / 2, myAlert.bounds.size.height - 50);
[indicator startAnimating];
[myAlert addSubview:indicator];
[self operateUpdate];
[self updateImage];
[self operationCompleted];
}
In updateImage, operateUpdate and operationCompleted Method
- (void)updateImage {
NSString *snake_ico_file = #"snake_img_icn_";
NSString *filePath = [self dataFile:[snake_ico_file stringByAppendingString:#"0.jpg"]];
int max_count = [[self readData] count];
if (![[NSFileManager defaultManager] fileExistsAtPath:filePath]) {
for (int i = 0; i < max_count; i++) {
NSString *path = #"http://exitosus.no.de/drngoo/image/";
path = [path stringByAppendingFormat:#"%d",i];
NSString *ico_path = [path stringByAppendingFormat:#"/ico"];
//icon
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filename = [snake_ico_file stringByAppendingFormat:#"%d.jpg"];
NSString *localFilePath = [documentsDirectory stringByAppendingPathComponent:filename];
NSData *thedata = [NSData dataWithContentsOfURL:[NSURL URLWithString:ico_path]];;
[thedata writeToFile:localFilePath atomically:YES];
}
}
-(void) operationCompleted
{
[myAlert dismissWithClickedButtonIndex:0 animated:YES];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Message form System" message:#"Database was updated successful" delegate:nil cancelButtonTitle:#"OK" otherButtonTitles: nil];
[alert show];
}
- (void)operateUpdate {
NSString *filePath = [self dataFileSettingPath];
int updatedVer = 0;
int version = [self checkDatabase];
if (version == -1) {
updatedVer = [self createDataBase:0];
} else {
updatedVer = [self updateDataBase:version];
}
[self.settingInfo setObject:[NSString stringWithFormat:#"%d",updatedVer] forKey:#"DBVersion"];
[self.settingInfo writeToFile:filePath atomically:YES];
}
How I fix them and work correctly?

Answer 1

The alertView will show only after your image downloading complete. One Solution to solve this is,
Create another class ImageDownLoad.h
in .h
#property(nonatomic,assign)id delegate;
#property(nonatomic,retain) NSString *path;
in .m
#synthesize delegate;
#synthesize path;
Create a method namely,
-(void)startDownloadImageWithUrl:(NSURL*)imageUrl withLocalFilePath:(NSSTring*)filePath{
path = filePath;
receiveData = [NSMutableData data];
NSURLRequest *request = [[NSURLRequest alloc]initWithURL:imageUrl];
NSURLConnection *connection = [[NSURLConnection alloc]initWithRequest:request];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[receiveData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection{
[(id)delegate performSelector:#selector(SaveData:inFilePath:) withObject:receiveData withObject:path];
}
This will create connection and start download your image in a separate class. Then in your mai ViewController add bit of code like below.
- (void)updateImage {
NSString *snake_ico_file = #"snake_img_icn_";
NSString *filePath = [self dataFile:[snake_ico_file stringByAppendingString:#"0.jpg"]];
int max_count = [[self readData] count];
if (![[NSFileManager defaultManager] fileExistsAtPath:filePath]) {
for (int i = 0; i < max_count; i++) {
NSString *path = #"http://exitosus.no.de/drngoo/image/";
path = [path stringByAppendingFormat:#"%d",i];
NSString *ico_path = [path stringByAppendingFormat:#"/ico"];
//icon
NSArray *paths =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filename = [snake_ico_file stringByAppendingFormat:#"%d.jpg"];
NSString *localFilePath = [documentsDirectory stringByAppendingPathComponent:filename];
ImageDownLoad *imageDown = [[ImageDownLoad alloc]init];
imageDown.delegate = self;
[imageDown startDownloadImageWithUrl:[NSURL URLWithString:ico_path] withLocalFilePath:localFilePath];
}
}
This method will be called each time when image download completes.
-(void)SaveData:(NSData*)data inFilePath:(NSString*)filePath{
[data writeToFile:filePath atomically:YES];
}
Your UI wont delay by doing so :)