Question

I am trying to do download some images from server then , set these images as background image for some UIButtons .

so first downloading images :

NSString *urlMag1 = [NSString stringWithFormat:@"http://myweb.com/i224_mag1.png"];
    NSString *urlMag2 = [NSString stringWithFormat:@"http://myweb.com/i224_mag2.png"];
    NSString *str = [NSString stringWithFormat:urlMag1,urlMag2,nil];

    NSData *data = [NSData dataWithContentsOfFile:str];
    NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    [data writeToFile:path atomically:YES];

    UIImage *imgMag1 = [UIImage imageNamed:@"i224_mag2.png"];
    [mag2 setBackgroundImage:imgMag1 forState:UIControlStateNormal];

but nothing happens !!,and how can I check to if these images are in directory to avoid more downloading

I would be grateful if you help me to solve this

thanks !

EDITED
@Fernando Cervantes

I created a method to set buttons BG images something like this , but I don’t know why does not work !

- (UIImage *)loadImages :(NSString *)fileNames ofType:(NSString *)extension inDirectory:(NSString *)directoryPath {

    [[NSFileManager defaultManager] fileExistsAtPath:[directoryPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.%@", fileNames, extension]]];
    return 0;
}

and set BG images :

- (void)buttonsBGImage {



    UIImage * bgMag2 = [self loadImages:@"i224_mag2" ofType:@"png" inDirectory:[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]];

    [mag2 setBackgroundImage:bgMag2 forState:UIControlStateNormal];


}

but actually nothing happens ! even I check the file and it’s in app directory

Answer 1

The following approach might help you out a bit.

Save

-(void) saveFile:(NSString *)fileName ofType:(NSString *)extension fromURL:(NSString *)fileIndexPath inDirectory:(NSString *)directoryPath {
    NSData * data = [NSData dataWithContentsOfURL:[NSURL URLWithString:fileIndexPath]];

    [data writeToFile:[NSString stringWithFormat:@"%@/%@.%@", directoryPath, fileName, extension] atomically:YES];
}

Check

-(BOOL) checkIfFileExists:(NSString *)fileName ofType:(NSString *)extension inDirectoryPath:(NSString *)directoryPath {
    bool result;

    if ([[NSFileManager defaultManager] fileExistsAtPath:[directoryPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.%@", fileName, extension]]]) {
        result = TRUE;
    } else {
        result = FALSE;
    }

    return result;
}

Set

UIButton * button = [[UIButton alloc] init];
UIImage * backgroundImage = [self loadImage:@"YourImageName" ofType:@"png" inDirectory:[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]];

[button setImage:backgroundImage forState:UIControlStateNormal];

---

-Edited-

I believe your problem is that you are returning 0 in your loadImages method. Instead of returning the image itself.

This is how I accomplished it:

Load

-(UIImage *) loadImage:(NSString *)fileName ofType:(NSString *)extension inDirectory:(NSString *)directoryPath {

    UIImage * result = [UIImage imageWithContentsOfFile:[NSString stringWithFormat:@"%@/%@.%@", directoryPath, fileName, extension]];

    return result;
}