Autogroup UITableView alphabetisch

Question

Gibt es eine Möglichkeit, meine UITableView alphabetisch zu gruppieren/automatisch zu teilen? Ich habe ein riesiges Array, das schön angezeigt wird, aber es wäre noch besser, wenn ich die Abschnitte wie in Contacts.app hätte.

Beste
-f

Answer 1

Zu allererst definieren Abschnitte

self.sections = [NSArray arrayWithObjects:@"#", @"a", @"b", @"c", @"d", @"e", @"f", @"g", @"h", @"i", @"j", @"k", @"l", @"m", @"n", @"o", @"p", @"q", @"r", @"s", @"t", @"u", @"v", @"w", @"x", @"y", @"z", nil]; 

dann

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView 
{ 
    return 27; 
} 

- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView 
{ 
    return self.sections; 
}  

- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString*)title atIndex:(NSInteger)index 
{ 
    return index; 
} 

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section { 
    return [self.sections objectAtIndex:section]; 
} 

Nach diesem Filter durch Alphabete

NSArray *sectionArray = [vendorList filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"SELF beginswith[c] %@", [self.sections objectAtIndex:section]]]; 
      rowCount = [sectionArray count]; 

Answer 2

ich habe folgendes:

AutoSectionTableViewDataSource.h

@protocol AutoSectionTableViewDataSource 
- (NSString*)tableView:(UITableView*)tableView sectionNameAtIndexPath:(NSIndexPath*)indexPath; 
@end 
@interface AutoSectionTableViewDataSource : NSObject <UITableViewDataSource> 
- (id)initWithDataSource:(NSObject<UITableViewDataSource,AutoSectionTableViewDataSource>*)dataSource; 
@end 

AutoSectionTableViewDataSource.m

@interface AutoSectionTableViewDataSource() 
@property(weak) NSObject<UITableViewDataSource,AutoSectionTableViewDataSource> *dataSource; 
@end 
@implementation AutoSectionTableViewDataSource 

- (id)initWithDataSource:(NSObject<UITableViewDataSource,AutoSectionTableViewDataSource>*)dataSource 
{ 
    self = [super init]; 
    self.dataSource = dataSource; 
    return self; 
} 

- (BOOL)respondsToSelector:(SEL)selector 
{ 
    if ([super respondsToSelector:selector]) return YES; 
    if (self.dataSource && [self.dataSource respondsToSelector:selector]) return YES; 
    return NO; 
} 

- (void)forwardInvocation:(NSInvocation*)invocation 
{ 
    if (self.dataSource && [self.dataSource respondsToSelector:invocation.selector]) { 
     [invocation invokeWithTarget:self.dataSource]; 
    } else { 
     [self doesNotRecognizeSelector:invocation.selector]; 
    } 
} 

- (NSMethodSignature *)methodSignatureForSelector:(SEL)selector 
{ 
    if (self.dataSource) return [self.dataSource methodSignatureForSelector:selector]; 
    return nil; 
} 

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView 
{ 
    NSInteger rows = [self.dataSource tableView:tableView numberOfRowsInSection:0]; 
    NSMutableSet *set = [[NSMutableSet alloc] init]; 
    for (NSInteger row=0; row<rows; row++) { 
     NSIndexPath *indexPath = [NSIndexPath indexPathForRow:row inSection:0]; 
     NSString* sectionName = [self.dataSource tableView:tableView sectionNameAtIndexPath:indexPath]; 
     [set addObject:sectionName]; 
    } 
    return set.count; 
} 

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 
{ 
    NSInteger rows = [self.dataSource tableView:tableView numberOfRowsInSection:0]; 
    NSMutableDictionary *tmp = [[NSMutableDictionary alloc] init]; 
    NSInteger count = 0; 
    for (NSInteger row=0; row<rows; row++) { 
     NSIndexPath *indexPath = [NSIndexPath indexPathForRow:row inSection:0]; 
     NSString* sectionName = [self.dataSource tableView:tableView sectionNameAtIndexPath:indexPath]; 
     if (!tmp[sectionName]) { 
      tmp[sectionName] = @(tmp.count); 
     } 
     if ([tmp[sectionName] intValue] == section) { 
      count++; 
     } 
    } 
    return count; 
} 

- (NSString*)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section 
{ 
    NSInteger rows = [self.dataSource tableView:tableView numberOfRowsInSection:0]; 
    NSMutableSet *set = [[NSMutableSet alloc] init]; 
    for (NSInteger row=0; row<rows; row++) { 
     NSIndexPath *indexPath = [NSIndexPath indexPathForRow:row inSection:0]; 
     NSString* sectionName = [self.dataSource tableView:tableView sectionNameAtIndexPath:indexPath]; 
     if (![set containsObject:sectionName]) { 
      [set addObject:sectionName]; 
      if (set.count - 1 == section) { 
       //NSLog(@"AutoSectionTableViewDataSource titleForHeaderInSection:%d -> %@", section, sectionName); 
       return sectionName; 
      } 
     } 
    } 
    return nil; 
} 

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    NSInteger rows = [self.dataSource tableView:tableView numberOfRowsInSection:0]; 
    NSMutableDictionary *tmp = [[NSMutableDictionary alloc] init]; 
    NSInteger count = 0; 
    for (NSInteger row=0; row<rows; row++) { 
     NSIndexPath *rowIndexPath = [NSIndexPath indexPathForRow:row inSection:0]; 
     NSString* sectionName = [self.dataSource tableView:tableView sectionNameAtIndexPath:rowIndexPath]; 
     if (!tmp[sectionName]) { 
      tmp[sectionName] = @(tmp.count); 
     } 
     if ([tmp[sectionName] intValue] == indexPath.section) { 
      count++; 
      if (count-1 == indexPath.row) { 
       UITableViewCell *cell = [self.dataSource tableView:tableView cellForRowAtIndexPath:rowIndexPath]; 
       return cell; 
      } 
     } 
    } 
    return nil; 
} 

@end 

und dann in Ihrem Code:

- (NSString*)tableView:(UITableView *)tableView sectionNameAtIndexPath:(NSIndexPath *)indexPath 
{ 
    return @"this would be your section name for indexPath.row" 
} 

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 
{ 
    return total_number_of_rows; 
} 

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    return cell_for_indexPath.row; 
} 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    // instead of self.tableView.dataSource = self; use: 
    self.autoSectionDataSource = [[AutoSectionTableViewDataSource alloc] initWithDataSource:self]; 
    self.tableView.dataSource = self.autoSectionDataSource; 
} 

Answer 3

Ich habe eine pod nur für diese :

https://github.com/chrisladd/CGLAlphabetizer/

pod 'CGLAlphabetizer', '~> 0.1'

Es schafft ein Wörterbuch von Arrays von Buchstaben des Alphabets aus einem einzelnen Array von Objekten und einer beliebigen keyPath verkeilt.

alphabetizedDictionary = [CGLAlphabetizer alphabetizedDictionaryFromObjects:anArray usingKeyPath:@"keyPath"];

Also, Sie unter der Annahme, hatte das Modell Objekt, das so aussah:

@interface CGLContact : NSObject 
@property (nonatomic) NSString *firstName; 
@property (nonatomic) NSString *lastName; 

@property (nonatomic, readonly) NSString *fullName; 

@end 

Ihre Tableviewcontroller Implementierung wie folgt aussehen könnte:

static NSString * const CGLContactsCellIdentifier = @"CGLContactsCellIdentifier"; 

@interface CGLContactsTableViewController() 
@property (nonatomic) NSDictionary *alphabetizedDictionary; 
@property (nonatomic) NSArray *sectionIndexTitles; 
@end 

@implementation CGLContactsTableViewController 

- (void)viewDidLoad { 
    [super viewDidLoad]; 
    [self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:CGLContactsCellIdentifier]; 
} 

- (void)setContacts:(NSArray *)contacts { 
    _contacts = contacts; 
    self.alphabetizedDictionary = [CGLAlphabetizer alphabetizedDictionaryFromObjects:_contacts usingKeyPath:@"lastName"]; 
    self.sectionIndexTitles = [CGLAlphabetizer indexTitlesFromAlphabetizedDictionary:self.alphabetizedDictionary]; 

    [self.tableView reloadData]; 
} 

- (CGLContact *)objectAtIndexPath:(NSIndexPath *)indexPath { 
    NSString *sectionIndexTitle = self.sectionIndexTitles[indexPath.section]; 
    return self.alphabetizedDictionary[sectionIndexTitle][indexPath.row]; 
} 

#pragma mark - Table view data source 

- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView { 
    return self.sectionIndexTitles; 
} 

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { 
    return [self.sectionIndexTitles count]; 
} 

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { 
    NSString *sectionIndexTitle = self.sectionIndexTitles[section]; 
    return [self.alphabetizedDictionary[sectionIndexTitle] count]; 
} 

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { 
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CGLContactsCellIdentifier forIndexPath:indexPath]; 

    CGLContact *contact = [self objectAtIndexPath:indexPath]; 
    cell.textLabel.text = contact.fullName; 

    return cell; 
} 

@end 

Bestückt mit jedem Menschen, der ist ins Weltall gegangen: