Classes/ElementsSortedByNameDataSource.m
/* |
Copyright (C) 2015 Apple Inc. All Rights Reserved. |
See LICENSE.txt for this sample’s licensing information |
Abstract: |
Provides the table view data for the elements sorted by name. |
*/ |
#import "ElementsSortedByNameDataSource.h" |
#import "PeriodicElements.h" |
#import "AtomicElementTableViewCell.h" |
@implementation ElementsSortedByNameDataSource |
// protocol methods for "ElementsDataSourceProtocol" |
// return the data used by the navigation controller and tab bar item |
- (NSString *)name { |
return @"Name"; |
} |
- (NSString *)navigationBarName { |
return @"Sorted by Name"; |
} |
- (UIImage *)tabBarImage { |
return [UIImage imageNamed:@"name_gray.png"]; |
} |
// atomic name is displayed in a plain style tableview |
- (UITableViewStyle)tableViewStyle { |
return UITableViewStylePlain; |
} |
// return the atomic element at the index |
- (AtomicElement *)atomicElementForIndexPath:(NSIndexPath *)indexPath { |
return [[PeriodicElements sharedPeriodicElements] elementsWithInitialLetter:[[PeriodicElements sharedPeriodicElements] elementNameIndexArray][indexPath.section]][indexPath.row]; |
} |
#pragma mark - UITableViewDataSource |
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath |
{ |
AtomicElementTableViewCell *cell = |
(AtomicElementTableViewCell *)[tableView dequeueReusableCellWithIdentifier:@"AtomicElementTableViewCell"]; |
// set the element for this cell as specified by the datasource. The atomicElementForIndexPath: is declared |
// as part of the ElementsDataSource Protocol and will return the appropriate element for the index row |
// |
cell.element = [self atomicElementForIndexPath:indexPath]; |
return cell; |
} |
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { |
// this table has multiple sections. One for each unique character that an element begins with |
// [A,B,C,D,E,F,G,H,I,K,L,M,N,O,P,R,S,T,U,V,X,Y,Z] |
// return the count of that array |
return [[[PeriodicElements sharedPeriodicElements] elementNameIndexArray] count]; |
} |
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView { |
// returns the array of section titles. There is one entry for each unique character that an element begins with |
// [A,B,C,D,E,F,G,H,I,K,L,M,N,O,P,R,S,T,U,V,X,Y,Z] |
return [[PeriodicElements sharedPeriodicElements] elementNameIndexArray]; |
} |
- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index { |
return index; |
} |
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { |
// the section represents the initial letter of the element |
// return that letter |
NSString *initialLetter = [[PeriodicElements sharedPeriodicElements] elementNameIndexArray][section]; |
// get the array of elements that begin with that letter |
NSArray *elementsWithInitialLetter = [[PeriodicElements sharedPeriodicElements] elementsWithInitialLetter:initialLetter]; |
// return the count |
return elementsWithInitialLetter.count; |
} |
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section { |
// this table has multiple sections. One for each unique character that an element begins with |
// [A,B,C,D,E,F,G,H,I,K,L,M,N,O,P,R,S,T,U,V,X,Y,Z] |
// return the letter that represents the requested section |
// this is actually a delegate method, but we forward the request to the datasource in the view controller |
// |
return [[PeriodicElements sharedPeriodicElements] elementNameIndexArray][section]; |
} |
@end |
Copyright © 2015 Apple Inc. All Rights Reserved. Terms of Use | Privacy Policy | Updated: 2015-08-25