Objective-C中NSArray和NSMutableArray的基本用法

/*---------------------NSArray---------------------------*/
       //创建数组
       NSArray *array1 = [NSArray arrayWithObject:@"1"];
       NSArray *array2 = [NSArray arrayWithObjects:@"1",@"2",@"3", nil];
       NSArray *array3 = [NSArray arrayWithArray:array2];
       NSLog(@"array1 = %@",array1);
       NSLog(@"array2 = %@",array2);
       NSLog(@"array3 = %@",array3);

       //获取数组内数据个数
       int count = [array2 count];
       NSLog(@"array2 size is %d",count);

       //访问数组内的数据
       NSString *str1 = [array2 objectAtIndex:0];
       NSLog(@"array2 first content is %@",str1);

       //数组中插入数据   返回新的数组
       NSArray *array4 = [array3 arrayByAddingObject:@"4"];
       NSLog(@"array4 = %@",array4);

       //数组内的数据以制定字符连接
       NSString *str2 = [array4 componentsJoinedByString:@","];
       NSLog(@"str2 = %@",str2);

       //判断数组中是否包含某对象
       BOOL b1 = [array4 containsObject:@"4"];
       BOOL b2 = [array4 containsObject:@"5"];
       NSLog(@"b1 = %d,b2 = %d",b1,b2);

       //取数组内制定对象的索引
       int index = [array4 indexOfObject:@"4"];
       NSLog(@"index = %d",index);

       NSString *str3 = [array4 lastObject];
       NSLog(@"array4 last object is %@",str3);

       /*-----------------------可变数组NSMutableArray-----------------------------------------*/
       //初始化数组 指定数组长度   但可变
       NSMutableArray *mArray1 = [NSMutableArray arrayWithCapacity:5];

       //向数组中添加元素
       [mArray1 addObject:@"aaaa"];
       [mArray1 addObject:@"cccc"];
       NSLog(@"mArray1 = %@",mArray1);

       //向指定位置插入元素
       [mArray1 insertObject:@"bbbb" atIndex:1];
       [mArray1 insertObject:@"dddd" atIndex:[mArray1 count]];
       [mArray1 insertObject:@"eeee" atIndex:[mArray1 count]];
       NSLog(@"mArray1 = %@",mArray1);

       //移除元素
       [mArray1 removeObject:@"eeee"];
       NSLog(@"mArray1 = %@",mArray1);
       [mArray1 removeObjectAtIndex:[mArray1 count]-1];
       NSLog(@"mArray1 = %@",mArray1);
       NSArray *array5 = [NSArray arrayWithObjects:@"bbbb",@"cccc", nil];
       [mArray1 removeObjectsInArray:array5];
       NSLog(@"mArray1 = %@",mArray1);

       //向数组内插入数组
       NSMutableArray *mArray2 = [NSMutableArray arrayWithObjects:@"aaaa",@"aaaa", nil];
       [mArray2 addObject:@"bbbb"];
       NSLog(@"mArray2 = %@",mArray2);
       [mArray2 addObjectsFromArray:array4];
       NSLog(@"mArray2 = %@",mArray2);

       //替换元素
       [mArray2 replaceObjectAtIndex:[mArray2 count]-1 withObject:@"5"];
       NSLog(@"mArray2 = %@",mArray2);

       //遍历数组  常规方法:性能较低
       NSArray *array6 = [NSArray arrayWithObjects:@"a",@"b",@"c",@"d",@"e", nil];
       int len = [array6 count];
       for (int i=0; i<len; i++) {
           NSString *value = [array6 objectAtIndex:i];
           NSLog(@"array6 %d content is %@",i,value);
       }

       //枚举遍历  相当于java中的增强for循环
       for (NSString *string in array6) {
           NSLog(@"array6 content is %@",string);
       }

       NSLog(@"-----------------------");

       //当不确定数组元素类型时
       for(id string in array6){
           NSLog(@"array6 content is %@",string);
       }