Classes/ElementsSortedByStateDataSource.m

/*
     File: ElementsSortedByStateDataSource.m
 Abstract: Provides the table view data for the elements sorted by their standard physical state.
  Version: 1.12
 
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#import "ElementsSortedByStateDataSource.h"
#import "PeriodicElements.h"
#import "AtomicElementTableViewCell.h"
 
@implementation ElementsSortedByStateDataSource
 
// protocol methods for "ElementsDataSourceProtocol"
 
// return the data used by the navigation controller and tab bar item
 
- (NSString *)name {
    
    return @"State";
}
 
- (NSString *)navigationBarName {
    
    return @"Grouped by State";
}
 
- (UIImage *)tabBarImage {
    
    return [UIImage imageNamed:@"state_gray.png"];
}
 
// atomic state is displayed in a grouped style tableview
- (UITableViewStyle)tableViewStyle {
    
    return UITableViewStylePlain;
} 
 
// return the atomic element at the index 
- (AtomicElement *)atomicElementForIndexPath:(NSIndexPath *)indexPath {
    
    // this table has multiple sections. One for each physical state
    // [solid, liquid, gas, artificial]
    // the section represents the index in the state array
    // the row the index into the array of data for a particular state
    
    // get the state
    NSString *elementState = [[[PeriodicElements sharedPeriodicElements] elementPhysicalStatesArray] objectAtIndex:indexPath.section];
    
    // return the element in the state array
    return [[[PeriodicElements sharedPeriodicElements] elementsWithPhysicalState:elementState] objectAtIndex: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 physical state
    // [solid, liquid, gas, artificial]
    // return the number of items in the states array
    //
    return [[[PeriodicElements sharedPeriodicElements] elementPhysicalStatesArray] count];
}
 
- (NSInteger)tableView:(UITableView *)tableView  numberOfRowsInSection:(NSInteger)section {
    
    // this table has multiple sections. One for each physical state
    // [solid, liquid, gas, artificial]
    
    // get the state key for the requested section
    NSString *stateKey = [[[PeriodicElements sharedPeriodicElements] elementPhysicalStatesArray] objectAtIndex:section];
    
    // return the number of items that are in the array for that state
    return [[[PeriodicElements sharedPeriodicElements] elementsWithPhysicalState:stateKey] count];
}
 
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
    
    // this table has multiple sections. One for each physical state
    
    // [solid, liquid, gas, artificial]
    // return the state 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] elementPhysicalStatesArray] objectAtIndex:section];
}
 
@end