OC——NSDictionary和NSMutableDictionary
//初始化 NSString *key1 = @"key1"; NSString *key2 = @"key2"; NSString *key3 = @"key3"; NSString *key4 = @"key4"; NSString *key5 = @"key5"; NSString *value1 = @"value1"; NSString *value2 = @"value2"; NSString *value3 = @"value3"; NSString *value4 = @"value4"; NSString *value5 = @"value5"; NSDictionary *dic1 = [NSDictionary dictionaryWithObject:value1 forKey:key1]; NSDictionary *dic2 = [NSDictionary dictionaryWithObjectsAndKeys:value1,key1,value2,key2, nil]; NSDictionary *dic3 = [NSDictionary dictionaryWithDictionary:dic2]; NSDictionary *dic4 = [NSDictionary dictionaryWithObjectsAndKeys:value3,key3,value4,key4,value5,key5, nil]; NSLog(@"dic1 = %@",dic1); NSLog(@"dic2 = %@",dic2); NSLog(@"dic3 = %@",dic3); //获取字典数量 int size = [dic3 count]; NSLog(@"dic3 size is %d",size); //获取value NSString *value = [dic3 objectForKey:key1]; NSLog(@"dic3 value1 is %@",value); //获取所有的key和value NSArray *allKeys = [dic3 allKeys]; NSArray *allValues = [dic3 allValues]; NSLog(@"allKeys = %@",allKeys); NSLog(@"allValues = %@",allValues); //遍历字典 for (NSString *key in dic3) { NSLog(@"dic3 key is %@, value is %@",key,[dic3 objectForKey:key]); } //--------------------------NSMutableDictionary 可变字典 ------------------------------------- //初始化 NSMutableDictionary *mDic1 = [NSMutableDictionary dictionaryWithDictionary:dic3]; NSLog(@"mDic1 = %@",mDic1); //添加、修改、删除元素 [mDic1 setValue:value3 forKey:key3]; [mDic1 setObject:value4 forKey:key4]; [mDic1 setValue:@"value333" forKey:key3]; NSLog(@"mDic1 = %@",mDic1); [mDic1 addEntriesFromDictionary:dic4]; NSLog(@"mDic1 = %@",mDic1); [mDic1 removeObjectForKey:key3]; [mDic1 removeObjectForKey:key4]; [mDic1 removeObjectForKey:key5]; NSLog(@"mDic = %@",mDic1); [mDic1 addEntriesFromDictionary:dic4]; NSLog(@"mDic = %@",mDic1); //判断是否含有某个key BOOL b1 = [[mDic1 allKeys] containsObject:key5]; NSLog(@"b1 = %d",b1);