alert = [[UIAlertView alloc] initWithTitle: @"How to use buttons"
                                   message: @"line 1. line 2, line 3 "
                                  delegate: nil
                         cancelButtonTitle: @"OK"
                         otherButtonTitles: nil];

UIAlertView *alert = [[UIAlertView alloc]
            initWithTitle: @"How to use buttons"
            message: [NSString stringWithFormat: @"%C line 1.n %C line 2,n %C line 3", (unichar) 0x2022, (unichar) 0x2022, (unichar) 0x2022];
            delegate: nil
            cancelButtonTitle:@"OK"
            otherButtonTitles:nil];

NSArray *subViewArray = alertView.subviews;
for(int x = 0; x < [subViewArray count]; x++){

    //If the current subview is a UILabel...
    if([[[subViewArray objectAtIndex:x] class] isSubclassOfClass:[UILabel class]]) {
        UILabel *label = [subViewArray objectAtIndex:x];
        label.textAlignment = NSTextAlignmentLeft;
    }
}

NSArray *subviewArray = alert.subviews;
for(int x = 0; x < [subviewArray count]; x++){

    if([[[subviewArray objectAtIndex:x] class] isSubclassOfClass:[UILabel class]]) {
        UILabel *label = [subviewArray objectAtIndex:x];
        label.textAlignment = UITextAlignmentLeft;
    }

alert.backgroundColor=[UIColor redColor];

@"line 1.nline 2,nline 3"