//--------------------不可變數組//1.數組的創建NSString *s1 = @"zhangsan";NSString *s2 = @"lisi";NSString *s3 = @"wangwu";//(1)NSArray *array1 = [[NSArray alloc] initWithObjects:s1,s2,s3, nil];NSLog(@"%@",array1); //等價于 array1.descripton//(2)使用類方法創建NSArray *array2 = [NSArray arrayWithObjects:s1,s2,s3, nil];//(3)創建一個數組對象，同時往里面存入一元素NSArray *array3 = [NSArray arrayWithObject:s1];//(4)創建一個數組，此數組中的元素來自array1NSArray *array4 = [NSArray arrayWithArray:array1];NSLog(@"array4 = %@",array4);//2.通過下標取元素NSString *str1 = [array4 objectAtIndex:0];//3.數組元素的個數NSUInteger count = [array4 count]; //等價于：array4.count;//4.判斷數組中的是否包含某個元素BOOL isContains = [array4 containsObject:@"zhangsan"];NSLog(@"isContains:%d",isContains);//5.查找某一個對象在數組中的下標位置NSUInteger index = [array4 indexOfObject:@"wangwu"];if (index == NSNotFound) {NSLog(@"Not find elemnts");} else {NSLog(@"index = %ld",index);}//6.鏈接數組中的字符串(前提：數組中都是字符串）NSString *joinString = [array4 componentsJoinedByString:@","];NSLog(@"joinString = %@",joinString);//7.訪問數組最后一個元素NSString *lastObj = [array4 lastObject]; //array4.lastObjectNSLog(@"lsatObj = %@",lastObj);//8.再原路的數組后面添加一個元素NSArray *array5 = [array4 arrayByAddingObject:@"zhaolia"];NSLog(@"array5 = %@",array5);//取對應下標元素int idx=4;if (idx <array5.count) {NSString *s = [array5 objectAtIndex:idx];NSLog(@"s = %@",s);}//--------------數組的遍歷//1.普通遍歷for (int i=0; i<array5.count; i++) {NSString *str = [array5 objectAtIndex:i];NSLog(@"%@",str);}//快速遍歷for (NSString *s in array5) {NSLog(@"%@",s);}//4.4之后的優化//1.創建一個素組NSArray *array7 = @[s1,s2,s3]; //等價于：NSArray *array7 = [NSArray arrayWithObjects:s1,s2,s3,nil];NSLog(@"array7 = %@",array7);NSString *str = array7[0];NSLog(@"array[7] = %@",str);//------------------可變數組//初始化，設定元素個數為5，可以更改的。（繼承自NSArray）NSMutableArray *mutableArray = [NSMutableArray arrayWithCapacity:5];//想數組中添加一個元素[mutableArray addObject:@"aaa"];//向數組中指定下標插入元素[mutableArray insertObject:@"ccc" atIndex:0];NSLog(@"%@",mutableArray); //原來位置元素后移//移除最后一個元素[mutableArray removeLastObject];NSLog(@"移除最后元素后：%@",mutableArray);//移除指定元素[mutableArray removeObject:@"aaa"];//移除指定下標元素[mutableArray removeObjectAtIndex:0];//向數組中添加數組[mutableArray addObjectsFromArray:array1];//1.創建可變數組NSString *t1 = @"zhangsan ";NSString *t2 = @"lisi";NSString *t3 = @"wangwu ";// NSMutableArray *mArray1 = @[s1,s2,s3];//wrong.這里創建了一個不可變數組NSMutableArray *mArray1 = [[NSMutableArray alloc] initWithObjects:s1,s2,s3, nil];//創建數組時，開辟3個空間用于存儲元素，存儲超過容量，數組自動增大空間NSMutableArray *mArray2 = [[NSMutableArray alloc] initWithCapacity:3];NSMutableArray *mArray3 = [NSMutableArray arrayWithCapacity:3];//2.添加元素[mArray2 addObject:t1];[mArray2 addObject:t2];[mArray2 addObject:t3];NSLog(@"mArray2= %@",mArray2);//將mArray2 中元素添加到mArray3中// [mArray3 addObjectsFromArray:mArray2];//將mArray2作為二維數字添加[mArray3 addObject:mArray2];NSLog(@"mArray3 = %@",mArray3);//3.插入元素[mArray2 insertObject:@"Jack" atIndex:0];NSLog(@"mArray2 = %@",mArray2);//4.替換元素[mArray2 replaceObjectAtIndex:0 withObject:@"John"];NSLog(@"替換：%@",mArray2);//5.互換兩個元素的位置[mArray2 exchangeObjectAtIndex:3 withObjectAtIndex:0];NSLog(@"mArray2 = %@",mArray2);//6.刪除元素//6.1根據下標刪除[mArray2 removeObjectAtIndex:2];NSLog(@"mArray2 = %@",mArray2);//6.2刪除最后一個元素[mArray2 removeLastObject];NSLog(@"mArray2 = %@",mArray2);//6.3刪除指定的對象//[mArray2 removeObject:@"zhangsan"];//6.4刪除所有元素[mArray2 removeAllObjects];NSLog(@"mArray2 = %@",mArray2);