sticky header tableview - iOS App codez

vc.h

#import <UIKit/UIKit.h>

@interface StickyViewController : UIViewController<UITableViewDelegate,UITableViewDataSource>

@property (weak, nonatomic) IBOutlet UILabel *v2l;

@property (weak, nonatomic) IBOutlet UITableView *myTableView;

@property (weak, nonatomic) IBOutlet NSLayoutConstraint *height_contraint;

@property (weak, nonatomic) IBOutlet NSLayoutConstraint *content_height;

@property (weak, nonatomic) IBOutlet UIView *view1;

@property (weak, nonatomic) IBOutlet UIView *v2;

@end

vc.m

#import "StickyViewController.h"

#import "StickyTableViewCell.h"

@interface StickyViewController (){

NSDictionary *animals;

NSArray *animalSectionTitles;

}

@property (assign, nonatomic) BOOL isFinding;

@property (assign, nonatomic) CGFloat previousOffset;

@end

@implementation StickyViewController

- (void)viewDidLoad {

[super viewDidLoad];

_myTableView.delegate=self;

_myTableView.dataSource=self;

animals = @{@"B" : @[@"Bear", @"Black Swan", @"Buffalo"],

@"C" : @[@"Camel", @"Cockatoo"],

@"D" : @[@"Dog", @"Donkey"],

@"E" : @[@"Emu"],

@"G" : @[@"Giraffe", @"Greater Rhea"],

@"H" : @[@"Hippopotamus", @"Horse"],

@"K" : @[@"Koala"],

@"L" : @[@"Lion", @"Llama"],

@"M" : @[@"Manatus", @"Meerkat"],

@"P" : @[@"Panda", @"Peacock", @"Pig", @"Platypus", @"Polar Bear"],

@"R" : @[@"Rhinoceros"],

@"S" : @[@"Seagull"],

@"T" : @[@"Tasmania Devil"],

@"W" : @[@"Whale", @"Whale Shark", @"Wombat"]};

animalSectionTitles = [[animals allKeys] sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)];

}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView

{

// Return the number of sections.

return [animalSectionTitles count];

}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section

{

return [animalSectionTitles objectAtIndex:section];

}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section

{

// Return the number of rows in the section.

NSString *sectionTitle = [animalSectionTitles objectAtIndex:section];

NSArray *sectionAnimals = [animals objectForKey:sectionTitle];

return [sectionAnimals count];

}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell" forIndexPath:indexPath];

// Configure the cell...

NSString *sectionTitle = [animalSectionTitles objectAtIndex:indexPath.section];

NSArray *sectionAnimals = [animals objectForKey:sectionTitle];

NSString *animal = [sectionAnimals objectAtIndex:indexPath.row];

cell.textLabel.text = animal;

// Configure the cell...

return cell;

}

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {

self.isFinding = YES;

}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {

if (self.isFinding) {

if (self.previousOffset == 0) {

self.previousOffset = self.myTableView.contentOffset.y;

} else {

CGFloat diff = self.myTableView.contentOffset.y - self.previousOffset;

if (diff != 0) {

self.previousOffset = 0;

self.isFinding = NO;

if (diff > 0) {

// moved up

// NSLog(@"top");

_v2.hidden=YES;

_height_contraint.constant=0;

} else {

NSLog(@"%f",_myTableView.contentOffset.y);

if (_myTableView.contentOffset.y < 120)

{ // TOP

_v2.hidden=NO;

_height_contraint.constant=100;

}

// moved down

// NSLog(@"down");

//_v2.hidden=NO;

// _height_contraint.constant=100;

}

@end