Objective c 为什么，当我初始化一个NSArray时，它最终是空的吗？

我是一个新手，所以如果它被证明是愚蠢的事情，我不会感到惊讶，但我正把头撞在墙上，试图弄明白为什么NSArray haikuArray在我尝试初始化WithObjects之后，从来没有包含任何对象。有什么想法吗

Gay_HaikuViewController.h文件：

#import <UIKit/UIKit.h>
#import "Array Setup.h"

@interface Gay_HaikuViewController : UIViewController
{
Array_Setup *gayHaikuSetup;
Array_Setup *userHaikuSetup;
NSMutableArray *allHaiku;
IBOutlet UITextView *haikuText;
}

@property (nonatomic,retain) Array_Setup *gayHaikuSetup;
@property (nonatomic,retain) Array_Setup *userHaikuSetup;
@property (nonatomic,retain) NSMutableArray *allHaiku;
@property (nonatomic,retain) IBOutlet UITextView *haikuText;
-(IBAction)nextHaiku:(id)sender;

---

提前感谢大家的帮助。

initWithObjects

返回一个值，但您没有将

array

设置为返回值。

此代码中存在严重问题：

arrayOfUserHaiku = [NSMutableArray alloc];
[arrayOfUserHaiku initWithContentsOfFile:@"/tmp/cool.txt"];
NSError *error = nil;
if (!arrayOfUserHaiku)
{
    NSLog(@"Read failed: %@.",[error localizedDescription]);
}
else 
{
    NSLog(@"cool.txt looks like this: %@.",arrayOfUserHaiku);
}
return arrayOfUserHaiku;
}

切勿拆分

alloc

和

init

init

方法有时（通常，实际上）不会返回与

alloc

返回的对象相同的对象。也就是说，这应该是：

arrayOfUserHaiku=[[NSMutableArray alloc]initWithContentsOfFile:@/tmp/cool.txt]

错误

不会由该代码中的任何内容设置；这不是一个全球性的问题

该方法应该返回一个自动释放的数组（假设为非ARC）

您应该避免在代码中使用大型静态字符串数组。将它们作为plist或文本文件放入应用程序包装器中，可以轻松本地化

（而且，正如评论员所建议的，不要把你的应用程序的内容放在问题中——有些人可能会觉得它令人反感）

Array\u Setup.m文件：

#import "Array Setup.h"

@implementation Array_Setup

@synthesize arrayOfGayHaiku,arrayOfUserHaiku;

-(NSMutableArray *)readFromUserArray
{
arrayOfUserHaiku = [NSMutableArray alloc];
[arrayOfUserHaiku initWithContentsOfFile:@"/tmp/cool.txt"];
NSError *error = nil;
if (!arrayOfUserHaiku)
{
    NSLog(@"Read failed: %@.",[error localizedDescription]);
}
else 
{
    NSLog(@"cool.txt looks like this: %@.",arrayOfUserHaiku);
}
return arrayOfUserHaiku;
}

-(NSArray *)readFromGayArray
{
NSArray *array = [NSArray alloc];
[array initWithObjects:@"Lorem", @"ipsum", nil]; 

return array;
}

@end

   #import "Array_Setup.h"

@implementation Array_Setup

@synthesize arrayOfGayHaiku,arrayOfUserHaiku;

-(NSMutableArray *)readFromUserArray
{
    arrayOfUserHaiku = [[NSMutableArray alloc] initWithContentsOfFile:@"/tmp/cool.txt"];
 //   [arrayOfUserHaiku initWithContentsOfFile:@"/tmp/cool.txt"];
    NSError *error = nil;
    if (!arrayOfUserHaiku)
    {
        NSLog(@"Read failed: %@.",[error localizedDescription]);
    }
    else 
    {
        NSLog(@"cool.txt looks like this: %@.",arrayOfUserHaiku);
    }
    return arrayOfUserHaiku;
}

-(NSArray *)readFromGayArray
{
    NSArray *array = [NSArray arrayWithObjects:@"I don't understand.\nYou love it when I do that--\nWait, no.  That's Stephen.",

     @"Frantically hiding\nPorno and Mapplethorpe prints--\nMom is on her way.",

     @"Remember when I\nSaid I disliked oral sex?\nI meant just with you.",

     @"You were perfection.\nThen you misspelled 'embarrassed.'\nDon't call me again.",

     //Am omitting a bunch of these to make my Stack Overflow question shorter.

     @"I know you think I\nLike it when you slap my ass.\nYou are mistaken.",

     @"Flailing to the beat--\nCould I possibly look half\nAs dumb as I feel?",

     @"Last night, you looked hot.\nToday, you want to discuss\nThe whole foods movement.", nil]; 

    return array;
}

@end

Gay_HaikuViewController.m文件：

#import "Gay_HaikuViewController.h"
#import "Array Setup.h"

@interface Gay_HaikuViewController ()

@end

@implementation Gay_HaikuViewController

@synthesize gayHaikuSetup,userHaikuSetup,allHaiku,haikuText;

- (void)viewDidLoad
{
[super viewDidLoad];

NSArray *haikuArray = [gayHaikuSetup arrayOfGayHaiku];
haikuArray = [gayHaikuSetup readFromGayArray];
//This next line is how I know there are no objects in haikuArray.
NSLog(@"%d",[haikuArray count]);
NSMutableArray *userArray = [userHaikuSetup arrayOfUserHaiku];
userArray = [userHaikuSetup readFromUserArray];
allHaiku = [[NSMutableArray alloc] init];
for (int i=0; i<[haikuArray count]; i++)
    [allHaiku addObject:[haikuArray objectAtIndex:i]];
for (int i=0; i<[userArray count]; i++)
    [allHaiku addObject:[userArray objectAtIndex:i]];
}

userHaikuSetup= [[Array_Setup alloc] init];

gayHaikuSetup= [[Array_Setup alloc] init]; // [gayHaikuSetup arrayOfGayHaiku];

NSArray * haikuArray = [NSArray arrayWithArray: [gayHaikuSetup readFromGayArray]];
//This next line I added to find out whether the array had any objects--I always get 0.
NSLog(@"%lu",[haikuArray count]);

NSMutableArray *userArray = [userHaikuSetup readFromUserArray];
allHaiku = [[NSMutableArray alloc] init];
for (int i=0; i<[haikuArray count]; i++)
    [allHaiku addObject:[haikuArray objectAtIndex:i]];
for (int i=0; i<[userArray count]; i++)
    [allHaiku addObject:[userArray objectAtIndex:i]];


NSLog(@"%lu",[allHaiku count]);

userHaikuSetup=[[Array_Setup alloc]init]；
gayHaikuSetup=[[Array_Setup alloc]init]；//[gayHaikuSetup arrayOfGayHaiku]；
NSArray*haikuArray=[NSArray ARRAY WITHARRAY:[gayHaikuSetup readFromGayArray]]；
//我添加了下一行来确定数组是否有任何对象——我总是得到0。
NSLog（@“%lu”，[haikuArray计数]）；
NSMutableArray*userArray=[userHaikuSetup readFromUserArray]；
allHaiku=[[NSMutableArray alloc]init]；
对于（int i=0；i请使用lorem ipsum编辑数组中的文本。人们可能会觉得它令人反感。最好将它缩短为一行，因为代码不需要运行。完成。对此表示抱歉。好的。请原谅我不理解，但是
initWithObjects
返回的值是什么？我尝试了
initWithObjects:count:
但不断收到一条错误消息，要求在
计数之前执行
：
，这没有任何意义——当我添加它时，它只是产生了另一条错误消息。@JoelDerfner:返回值是已初始化的对象。感谢所有这些。我正在使用ARC，但我已经实现了您的其余建议，并且它是正确的更干净。请看我的答案；您的代码可能会运行，但这并不意味着它是正确的。而且您的答案缺乏解释。
userHaikuSetup= [[Array_Setup alloc] init];

gayHaikuSetup= [[Array_Setup alloc] init]; // [gayHaikuSetup arrayOfGayHaiku];

NSArray * haikuArray = [NSArray arrayWithArray: [gayHaikuSetup readFromGayArray]];
//This next line I added to find out whether the array had any objects--I always get 0.
NSLog(@"%lu",[haikuArray count]);

NSMutableArray *userArray = [userHaikuSetup readFromUserArray];
allHaiku = [[NSMutableArray alloc] init];
for (int i=0; i<[haikuArray count]; i++)
    [allHaiku addObject:[haikuArray objectAtIndex:i]];
for (int i=0; i<[userArray count]; i++)
    [allHaiku addObject:[userArray objectAtIndex:i]];


NSLog(@"%lu",[allHaiku count]);