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//Detect when tableview is updating

[CATransaction begin];

[CATransaction setCompletionBlock:^{
    // animation has finished
}];

[tableView beginUpdates];
// do some work

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- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate(BOOL)decelerate {
    if (decelerate == NO) {
        [self autoAdjustScrollToTop];
    }
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
    [self autoAdjustScrollToTop];
} 
- (void)autoAdjustScrollToTop {
    // compare the top two visible rows to the current content offset

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- (UIImage*)imageWithBorderFromImage:(UIImage*)source;
{
    CGSize size = [source size];
    
    UIGraphicsBeginImageContextWithOptions(CGSizeMake(size.width, size.height+20), NO, 0.0);
    CGContextRef context = UIGraphicsGetCurrentContext();

    [source drawInRect:CGRectMake(0, 20, size.width, 44)];
    CGContextFillRect(context, CGRectMake(0, 0, size.width, 20));

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   @property (strong, nonatomic) AVCaptureDevice* device;
@property (strong, nonatomic) AVCaptureDeviceInput* input;
@property (strong, nonatomic) AVCaptureMetadataOutput* output;
@property (strong, nonatomic) AVCaptureSession* session;
@property (strong, nonatomic) AVCaptureVideoPreviewLayer* preview;
@property (strong, nonatomic) AVCaptureStillImageOutput* imgIO;
   
   self.session = [[AVCaptureSession alloc] init];
    self.device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    NSError *error = nil;

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CGRect frame = [self.view frame];
CGPoint topLeft = CGPointMake(CGRectGetMinX(frame), CGRectGetMinY(frame));
CGPoint topRight = CGPointMake(CGRectGetMaxX(frame), CGRectGetMinY(frame));
CGPoint bottomLeft = CGPointMake(CGRectGetMinX(frame), CGRectGetMaxY(frame));
CGPoint bottomRight = CGPointMake(CGRectGetMaxX(frame), CGRectGetMaxY(frame));

//If you need those coordinates in a particular view, the first line should be something like

CGRect frame = [self.view convertRect:[self.view bounds] toView:someOtherView];

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[[UINavigationBar appearance] setTintColor:[UIColor grayColor]];
[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60) forBarMetrics:UIBarMetricsDefault]; // Takes out title

UIImage *backButtonImage = [UIImage imageNamed:@"BackArrowDark.png"];

if ([UINavigationBar instancesRespondToSelector:@selector(setBackIndicatorImage:)]) {
  [[UINavigationBar appearance] setBackIndicatorImage:backButtonImage];
  [[UINavigationBar appearance] setBackIndicatorTransitionMaskImage:backButtonImage];
} else {
  int imageSize = 21; // REPLACE WITH YOUR IMAGE WIDTH

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    CABasicAnimation *rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
    [rotationAnimation setRepeatCount:MAXFLOAT];
    [rotationAnimation setDuration:0.2];
    [rotationAnimation setAutoreverses:YES];
    
    [rotationAnimation setFromValue:@(M_PI / 25.0)];
    [rotationAnimation setToValue:@(-M_PI/ 25.0)];
    [someview.layer addAnimation:rotationAnimation forKey:@"wiggle"];

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 - (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
    
UITableViewHeaderFooterView *headerView = [[UITableViewHeaderFooterView alloc] init];
[headerView.contentView addSubview:self.someView];
return headerView;
}

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {
    return CGRectGetHeight(self.someView.frame); //play around with this value

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Basic QuartzCore Framework Animations
//shrinking - scaling
CABasicAnimation* shrink = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
shrink.toValue = [NSNumber numberWithDouble:0.9];
shrink.duration = 0.5;
shrink.delegate = self;
[[targetView layer] addAnimation:shrink forKey:@"shrink"];

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//I created a typedef for a block:

typedef void (^animationCompletionBlock)(void);

// And a key that I use to add a block to an animation:
#define kAnimationCompletionBlock @"animationCompletionBlock"

// Then, if I want to run animation completion code after a CAAnimation finishes, I set myself as the delegate of the animation, and add a block of code to the animation using setValue:forKey:
animationCompletionBlock theBlock = ^void(void)
{