1 /**************** NSDictionary *****************/ 2 3 //创建一个新的字典 4 NSDictionary *dictionary1=[NSDictionary dictionary]; 5 NSDictionary *dictionary2=[[NSDictionary alloc]init]; 6 NSLog(@"dictionary1:%@,dictionary2:%@",dictionary1,dictionary2); 7 // NSNumber *number=[NSNumber numberWithInt:100]; 8 9 //创建一个包含一对键值对的字典 10 NSDictionary *dictionary3=[NSDictionary dictionaryWithObject:@"value" forKey:@"key"]; 11 NSLog(@"dictionary3:%@",dictionary3); 12 13 //创建一个包含多对键值对的字典 14 NSDictionary *dictionary4=[NSDictionary dictionaryWithObjects:@[@"a",@"b",@"c"] forKeys:@[@"k1",@"k2",@"k3"]]; 15 NSLog(@"dictionary4:%@",dictionary4); 16 17 18 NSDictionary *dictionary5=[NSDictionary dictionaryWithObjectsAndKeys:@"a",@"k1",@"b",@"k2", nil]; 19 NSLog(@"dictionary5:%@",dictionary5); 20 21 //根据已有的字典创建字典 22 NSDictionary *dictionary6=[NSDictionary dictionaryWithDictionary:dictionary5]; 23 NSLog(@"dictionary6:%@",dictionary6); 24 25 //获取字典中元素的个数 26 NSLog(@"dictionary6 count = %d",(int)dictionary6.count); 27 28 //获取某个key值对应的value 29 NSLog(@"dictionary6 key is k1 value is %@",[dictionary6 valueForKey:@"k1"]); 30 31 NSArray *array=[NSArray arrayWithObjects:@"iphone",@"android",@"winphone", nil]; 32 NSDictionary *dictionary7=[NSDictionary dictionaryWithObject:array forKey:@"phone"]; 33 NSArray *newArray=[dictionary7 valueForKey:@"phone"]; 34 NSLog(@"newArray:%@",newArray); 35 36 37 //获取字典中所有的key 38 NSDictionary *dictionary8=[NSDictionary dictionaryWithObjects:@[@"a",@"b",@"c"] forKeys:@[@"k1",@"k2",@"k3"]]; 39 NSArray *keyArray=[dictionary8 allKeys]; 40 NSLog(@"keyArray:%@",keyArray); 41 42 //所有的key转换成枚举 43 NSEnumerator *enum1=[dictionary8 keyEnumerator]; 44 for (NSString *string in enum1) { 45 NSLog(@"%@",string); 46 } 47 48 /**************** NSMutableDictionary *****************/ 49 NSMutableDictionary *mutableDic1=[NSMutableDictionary dictionaryWithObjects:@[@"a",@"b",@"c"] forKeys:@[@"k1",@"k2",@"k3"]]; 50 51 //添加 52 [mutableDic1 setObject:@"value1" forKey:@"key1"]; 53 NSLog(@"mutableDic1 : %@",mutableDic1); 54 55 NSMutableDictionary *mutableDic2=[NSMutableDictionary dictionaryWithObjects:@[@"1",@"2"] forKeys:@[@"k4",@"k5"]]; 56 57 //添加字典元素到另一个字典中 58 [mutableDic1 addEntriesFromDictionary:mutableDic2]; 59 NSLog(@"mutableDic1%@ mutableDic2%@",mutableDic1,mutableDic2); 60 61 //把当前字典所有元素替换为新的字典中的元素 62 //[mutableDic1 setDictionary:mutableDic2]; 63 NSLog(@"mutableDic1 : %@",mutableDic1); 64 65 //删除 66 [mutableDic1 removeObjectForKey:@"key1"]; 67 NSLog(@"mutableDic1 : %@",mutableDic1); 68 69 [mutableDic1 removeObjectsForKeys:@[@"k4",@"k5"]]; 70 NSLog(@"mutableDic1 : %@",mutableDic1); 71 72 //根据指定key值替换value值 73 [mutableDic1 setObject:@"new" forKey:@"k1"]; 74 NSLog(@"mutableDic1 : %@",mutableDic1);