1 #import 2 int main(int argc, const char * argv[]) 3 { 4     @autoreleasepool { 5         //不可变字典NSDictionary 6         //字典的创建 7         NSDictionary *dic1=[NSDictionary dictionaryWithObject:@"velue" forKey:@"k1"];//一个键 一个值 8         NSDictionary *dic2=[NSDictionary dictionaryWithObjectsAndKeys:@"v1",@"k1",@"v2",@"k2",@"v3",@"k3",@"v4",@"k4",@"v5",@"k5",nil];//创建多个键 多个值 9         NSDictionary *dic3=[NSDictionary dictionaryWithDictionary:dic1];//直接把dic内容给dic310         NSLog(@"dic1:%@",dic1);11         NSLog(@"dic2:%@",dic2);12         NSLog(@"dic3:%@",dic3);13         14         //获取字典的数量15         int count=[dic2 count];16         NSLog(@"%d",count);17         //获取k3的value18         NSString *string=[dic2 objectForKey:@"k3"];19         NSLog(@"value:%@",string);20         21         //获取字典中所有的key和value22         NSArray *keyArray=[dic2 allKeys];23         NSArray *valueArry=[dic2 allValues];24         NSLog(@"keyArray:%@valueArry:%@",keyArray,valueArry);25         26         27         ////28         //可变字典NSMutableDictionary29         NSMutableDictionary *mutableDic1=[NSMutableDictionary dictionaryWithObjectsAndKeys:@"v1",@"k1",@"v2",@"k2",@"v3",@"k3",@"v4",@"k4",@"v5",@"k5", nil];30         //上面是类方法直接赋值 下面是实例方法开辟空间并赋值31         NSMutableDictionary *mutableDic=[[NSMutableDictionary alloc]initWithObjectsAndKeys:@"v1",@"k1",@"v2",@"k2",@"v3",@"k3",@"v4",@"k4",@"v5",@"k5", nil];32         33         //将一个字典中的velue和key添加到另外一个字典中34         NSDictionary *dic4=[NSDictionary dictionaryWithObject:@"v6" forKey:@"k6"];35         [mutableDic addEntriesFromDictionary:dic4];36         NSLog(@"MutableDic%@",mutableDic);37         38         //向字典中添加新的velue和key39         [mutableDic setValue:@"object" forKey:@"key"];40         NSLog(@"%@",mutableDic);41         42         43         //创建一个空的字典数组44         NSMutableDictionary *mutableDic2=[NSMutableDictionary dictionary];45         [mutableDic2 setDictionary:mutableDic];//46         NSLog(@"dic2:%@",mutableDic2);47         48         //通过制定key删除49         [mutableDic2 removeObjectForKey:@"k4"];50         NSLog(@"dic2:%@",mutableDic2);51         52         //删除多个键值53         NSArray *keys=[NSArray arrayWithObjects:@"k1",@"k2",@"k3", nil];54         [mutableDic2 removeObjectsForKeys:keys];55         NSLog(@"dic2:%@",mutableDic2);56         57         58         //删除全部键值59         //        [mutableDic2 removeAllObjects];60         //        NSLog(@"dic2:%@",mutableDic2);61         62         63         //遍历字典  一般的方法64         for (int index=0;index<[mutableDic1 count]; index++) {65             NSString *object=[mutableDic1 objectForKey:[[mutableDic1 allKeys]objectAtIndex:index]];66             NSLog(@"object:%@",object);67         }68         //快速枚举69         NSLog(@"____________________");70         for (NSString *key in mutableDic1) {71             NSString *object=[mutableDic1 objectForKey:key];72             NSLog(@"object:%@",object);73         }74         NSLog(@"____________________");75         //使用枚举类型76         NSEnumerator *enumerator=[mutableDic1 keyEnumerator];77         id key;78         while(key=[enumerator nextObject]){79             id object=[mutableDic1 objectForKey:key];80             NSLog(@"object:%@",object);81             82         }83     }84     return 0;85 }