Question

我有NSMutableDictionary，其中Integers为Key，NSString为Values，例如：

键 - 值

1 - B

2 - C

3 - A

现在我想使用值按字母顺序对NSMutableDictionary进行排序。所以我希望我的字典如下：Key（3,1,2） - ＆gt; Value（A，B，C）。我该怎么做？

Answer 1

来自Apple文档： https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/Collections/Articles/Dictionaries.html#//apple_ref/doc/uid/20000134-SW4

按值排序字典键：

NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:
    [NSNumber numberWithInt:63], @"Mathematics",
    [NSNumber numberWithInt:72], @"English",
    [NSNumber numberWithInt:55], @"History",
    [NSNumber numberWithInt:49], @"Geography",
    nil];

NSArray *sortedKeysArray =
    [dict keysSortedByValueUsingSelector:@selector(compare:)];
// sortedKeysArray contains: Geography, History, Mathematics, English

阻止自定义词典排序：

NSArray *blockSortedKeys = [dict keysSortedByValueUsingComparator: ^(id obj1, id obj2) {

     if ([obj1 integerValue] > [obj2 integerValue]) {
          return (NSComparisonResult)NSOrderedDescending;
     }

     if ([obj1 integerValue] < [obj2 integerValue]) {
          return (NSComparisonResult)NSOrderedAscending;
     }
     return (NSComparisonResult)NSOrderedSame;
}];

Answer 2

尝试这个逻辑

  NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithObjectsAndKeys:@"B",@"B",@"A",@"A",@"C",@"C", nil];
    NSMutableArray *sortedArray = [NSMutableArray arrayWithArray:[dict allKeys]];
    [sortedArray sortUsingSelector:@selector(localizedCaseInsensitiveCompare:)];
    for (NSString *key in sortedArray) {
        NSLog(@"%@",[dict objectForKey:key]);
    }

按字母顺序对NSMutableDictionary的值进行排序

2 个答案: