iOS Day 23

tappedProcessInBackground1.m

- (IBAction)tappedProcessInBackground:(id)sender {    
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), ^{
        
        //Do EXTREME PROCESSING!!!
        for (int i = 0; i< 100; i++) {
            [NSThread sleepForTimeInterval:.05];
            NSLog(@"%i", i);
        }

    });
}

tappedProcessInBackground2.m

- (IBAction)tappedProcessInBackground:(id)sender {    
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), ^{
        
        //Do EXTREME PROCESSING!!!
        for (int i = 0; i< 100; i++) {
            [NSThread sleepForTimeInterval:.05];
            NSLog(@"%i", i);
        }
        
        dispatch_async(dispatch_get_main_queue(), ^{
            [self updateLabelWhenBackgroundDone];
        });
    });
}

tappedProcessInForeground.m

- (IBAction)tappedProcessInForeground:(id)sender {
    for (int i = 0; i< 100; i++) {
        [NSThread sleepForTimeInterval:.05];
        NSLog(@"%i", i);
    }
}

tappedUpdateLabel.m

- (IBAction)tappedUpdateLabel:(id)sender {
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"HH:mm:ss"];
    NSString *stringFromDate = [formatter stringFromDate:[NSDate date]];
    self.lblInfo.text = [stringFromDate stringByAppendingFormat:@"\n%@", self.lblInfo.text];
}

updateLabelWhenBackgroundDone.m

- (void)updateLabelWhenBackgroundDone {
        self.lblInfo.text = [@"Background Done!" stringByAppendingFormat:@"\n%@", self.lblInfo.text];
}

ViewController.h

@interface ViewController : UIViewController
- (IBAction)tappedProcessInForeground:(id)sender;
- (IBAction)tappedUpdateLabel:(id)sender;
- (IBAction)tappedProcessInBackground:(id)sender;
@property (weak, nonatomic) IBOutlet UILabel *lblInfo;

@end

viewDidLoad1.m

- (void)viewDidLoad
{
    [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib.
    for (int i = 0; i< 100; i++) {
        [NSThread sleepForTimeInterval:.05];
            NSLog(@"%i", i);
    }
}