iphone - 如何在 iphone 中将 NSArray 数据分配给 NSMutableArray？

Question

在我的应用程序中，我有一个包含一些数据的 NSArray。我想获取该数据并将其放入名为 subArrayData 的 NSMutableArray 中。我能够将第一个数组中的数据插入到可变数组中，但是当应用程序运行时我得到:

warning:Incompatible pointer types assigning to 'nsmutablearray *' from 'nsarray *' please help out.

以下是我的代码:.h文件

#import <UIKit/UIKit.h>

@interface AddNew : UIViewController
{
    NSMutableArray *subArrayData;;
}
@property(nonatomic ,retain)NSMutableArray *subArrayData;

.m文件

#import "AddNew.h"
#import "DashBoardPage.h"
#import "SubmitYourListing.h"


@implementation AddNew

@synthesize subArrayData;

-(void)accommodationAndTravel
{
    subArrayData =[[NSArray alloc] initWithArray:[NSArray arrayWithObjects:@"Select one",@"Accommodation and travel hospitality",@"Apartments and villas",@"Bed and Breakfast",@"Caravan parks and campsites",@"Hospitality",
                                                  @"Hotels and Motels",@"Snow and Ski lodges",@"Tourist attractions and tourism information",@"Tours and Holidays",@"Travel agents and Services",nil]];


}

Answer 1

您可以通过调用其 -mutableCopy 方法将任何 NSArray 转换为 NSMutable 数组:

NSArray *someArray = ...;
NSMutableArray* subArrayData = [someArray mutableCopy];