1,數(shù)組NSArry/NSMutableArray

（1）不可變數(shù)組

NSArray*array1=@[@"a",@"b",@"c",@"d"];//創(chuàng)建? ? *是對(duì)象

NSLog(@"array1=%@",array1);

//數(shù)組元素個(gè)數(shù).count

NSLog(@"count=%ld",array1.count);

//通過下標(biāo)訪問數(shù)組里面元素

NSString*str=array1[0];

NSLog(@"str=%@",str);

（2）可變數(shù)組NSMutableArray

NSMutableArray*mutableArray=[NSMutableArrayarrayWithObjects:@"1",@"2",@"3",@"4",nil];

NSLog(@"mutableArray=%@",mutableArray);

//元素個(gè)數(shù)：count

//添加個(gè)數(shù)

[mutableArrayaddObject:@"5"];

NSLog(@"已添加————————%@",mutableArray);

//移除

[mutableArrayremoveObject:@"3"];

NSLog(@"已移除-------%@",mutableArray);

2.字典_((存放多個(gè)鍵值對(duì)的一種數(shù)據(jù)類型)NSDictionary,NAMutableDictionary)

（1）不可變字典NSDictionary

NSDictionary*dict=@{@"key1":@"value1",@"key2":@"value2",@"key3":@"value3"};

NSLog(@"dict=%@",dict);

NSString*string=[dictobjectForKey:@"key1"];

NSLog(@"string=%@",string);

//所有key值，所有value值

NSLog(@"allkeys=%@,allvalues=%@",dict.allKeys,dict.allValues);

（2）可變字典