iOS中字典實際上是無序的,那么如果我們要對字典進行排序要怎么做呢?

代碼如下:

@interface OrderedDictionary : NSMutableDictionary {NSMutableDictionary *dictionary;NSMutableArray *array; }//插入一個位置 - (void)insertObject:(id)anObject forKey:(id)aKey atIndex:(NSUInteger)anIndex;//取得某個位置的obj - (id)keyAtIndex:(NSUInteger)anIndex;//逆序 - (NSEnumerator *)reverseKeyEnumerator;//順序 - (NSEnumerator *)keyEnumerator; @end
#import "OrderedDictionary.h"NSString *DescriptionForObject(NSObject *object, id locale, NSUInteger indent) {NSString *objectString;if ([object isKindOfClass:[NSString class]]){objectString = (NSString *)[[object retain] autorelease];}else if ([object respondsToSelector:@selector(descriptionWithLocale:indent:)]){objectString = [(NSDictionary *)object descriptionWithLocale:locale indent:indent];}else if ([object respondsToSelector:@selector(descriptionWithLocale:)]){objectString = [(NSSet *)object descriptionWithLocale:locale];}else{objectString = [object description];}return objectString; }@implementation OrderedDictionary//初始化方法 - (id)init {return [self initWithCapacity:0]; }//初始化方法 - (id)initWithCapacity:(NSUInteger)capacity {self = [super init];if (self != nil){dictionary = [[NSMutableDictionary alloc] initWithCapacity:capacity];array = [[NSMutableArray alloc] initWithCapacity:capacity];}return self; }//析構方法 - (void)dealloc {[dictionary release];[array release];[super dealloc]; }//copy方法 - (id)copy {return [self mutableCopy]; }//復寫方法 - (void)setObject:(id)anObject forKey:(id)aKey {if (![dictionary objectForKey:aKey]){[array addObject:aKey];}[dictionary setObject:anObject forKey:aKey]; }- (void)removeObjectForKey:(id)aKey {[dictionary removeObjectForKey:aKey];[array removeObject:aKey]; }- (NSUInteger)count {return [dictionary count]; }- (id)objectForKey:(id)aKey {return [dictionary objectForKey:aKey]; }- (NSEnumerator *)keyEnumerator {return [array objectEnumerator]; }- (NSEnumerator *)reverseKeyEnumerator {return [array reverseObjectEnumerator]; }- (void)insertObject:(id)anObject forKey:(id)aKey atIndex:(NSUInteger)anIndex {if ([dictionary objectForKey:aKey]){[self removeObjectForKey:aKey];}[array insertObject:aKey atIndex:anIndex];[dictionary setObject:anObject forKey:aKey]; }- (id)keyAtIndex:(NSUInteger)anIndex {return [array objectAtIndex:anIndex]; }//返回一個字符串對象,該對象代表了字典的內容,格式的屬性列表。 - (NSString *)descriptionWithLocale:(id)locale indent:(NSUInteger)level {NSMutableString *indentString = [NSMutableString string];NSUInteger i, count = level;for (i = 0; i 先看一段代碼

NSMutableDictionary *dict2 = [[NSMutableDictionary alloc]initWithCapacity:0];[dict2 setObject:@"one" forKey:@"1"];[dict2 setObject:@"two" forKey:@"2"];[dict2 setObject:@"four" forKey:@"4"];[dict2 setObject:@"three" forKey:@"3"];for (NSString *str in [dict2 allKeys]) {NSLog(@"key == %@",str);}

這個結果可以看到和我們實際存入字典的順序是不一樣的

OrderedDictionary *dict = [[OrderedDictionary alloc]initWithCapacity:0];[dict setObject:@"two" forKey:@"2"];[dict setObject:@"four" forKey:@"4"];[dict setObject:@"three" forKey:@"3"];[dict setObject:@"one" forKey:@"1"];[dict insertObject:@"five" forKey:@"5" atIndex:0];NSEnumerator *enumerator2 = [dict keyEnumerator];id obj;while(obj = [enumerator2 nextObject]){NSLog(@"%@",obj);}

總結

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