[Objective-C] 009_Foundation框架之NSDictionary与NSMutableDictionary

　　在Cocoa Foundation中NSDictionary和NSMutableDictionary 用于对象有序集合，NSDictionary和NSMutableDictionary 与 NSArray和NSMutableArray 有些不一样，前者可以保存多个不同类型的数据，而后者只能保存同一类型的数据。

1.NSDictionary 创建

NSDictionary *dictionary = [NSDictionary dictionaryWithObjectsAndKeys:@"SuperDo",@"teamName",@"SuperDo.Horse",@"teamMember", nil];

2.NSDictionary 遍历

NSDictionary *dictionary = [NSDictionary dictionaryWithObjectsAndKeys:@"SuperDo",@"teamName",@"SuperDo.Horse",@"teamMember", nil];



//得到词典的数量

int objectCount = (int)[dictionary count];

NSLog(@"词典的KEY数量为： %d",objectCount);



//获取词典中所有KEY值

NSEnumerator * enumeratorKey = [dictionary keyEnumerator];

//快速枚举遍历所有KEY的值

for (NSObject *object in enumeratorKey) {

    NSLog(@"KEY的值---》: %@",object);

}



//获取词典中所有Value值

NSEnumerator * enumeratorValue = [dictionary objectEnumerator];

//快速枚举遍历所有Value的值

for (NSObject *object in enumeratorValue) {

    NSLog(@"Value的值---》: %@",object);

}

3.NSDictionary 通过KEY找到的value

NSDictionary *dictionary = [NSDictionary dictionaryWithObjectsAndKeys:@"SuperDo",@"teamName",@"SuperDo.Horse",@"teamMember", nil];

NSObject *object = [dictionary objectForKey:@"teamName"];

if (object != nil) {

    NSLog(@"通过KEY找到的value是: %@",object);

}

4.NSMutableDictionary 创建

NSMutableDictionary *dictionary = [NSMutableDictionary dictionaryWithCapacity:10];

5.NSMutableDictionary 元素操作

NSMutableDictionary *dictionary = [NSMutableDictionary dictionaryWithCapacity:10];

    

//向词典中动态添加数据

[dictionary setObject:@"SuperDo" forKey:@"teamName"];

[dictionary setObject:@"SuperDo.Horse" forKey:@"teamMember"];



//通过KEY找到value

NSObject *object = [dictionary objectForKey:@"teamName"];



//获取所有的key

NSArray *allKeys = [dictionary allKeys];



//获取所有的value

NSArray *allValues = [dictionary allValues];

 

 

本站文章为 宝宝巴士 SD.Team 原创，转载务必在明显处注明：（作者官方网站： 宝宝巴士 ) 
转载自【宝宝巴士SuperDo团队】 原文链接: http://www.cnblogs.com/superdo/p/4594337.html