初始化使用NSArray的对象Array [英] Initialize Array of Objects using NSArray

问题描述

我是pretty新的Objective-C和iOS所以我一直在选择器视图玩耍。我定义了一个Person类，这样，当你创建一个新的人，它会自动给此人的姓名和年龄。

 ＃进口Person.h@implementation人@synthesize PERSONNAME，年龄; - （ID）的init
{
    自= [超级初始化]
    如果（个体经营）
    {
        PERSONNAME = [个体经营randomName]
        年龄= [个体经营randomAge]
    }    返回自我;
} - （的NSString *）randomName
{
    * NSString的名称;
    NSArray的* nameArr = [NSArray的arrayWithObjects：@吉尔情人节，@彼得·格里芬，@梅格格里芬，@杰克Lolwut
                            @迈克Roflcoptor，@辛迪·伍兹，@杰西卡风车，@亚历山大大帝，
                            @莎拉·彼得森，@斯科特Scottland，@杰夫芬达，@阿曼达教皇，@迈克尔·迈尔斯
                            @理查德Biggus，@Montey Python的@迈克武汉理工大学，@冒充者，@椅子，
                            零];
    NSUInteger randomIndex = arc4random（）％[nameArr计数]
    命名= [nameArr objectAtIndex：randomIndex];
    返回名称;
} - （NSInteger的*）randomAge
{
    //下界+ arc4random（）％（上界 - 下界）;
    NSInteger的* NUM =（NSInteger的*）（1 + arc4random（）％（99  -  1））;    返回NUM;
}@结束
 

现在我想打的人组成的数组，所以我可以抛出一堆入选择器，挑一个人，并显示他们的年龄。首先，虽然我需要的人的数组。如何使对象数组初始化并对其进行分配？

解决方案

 的NSMutableArray *人= [NSMutableArray的阵列]
的for（int i = 0; I＆LT; myPersonsCount;我++）{
   [人ADDOBJECT：[[人页头]初始化];
}
NSArray的* arrayOfPersons = [NSArray的arrayWithArray：人]; //如果你想一成不变的数组
 

你也可以不使用的NSMutableArray达到这个：

 的NSArray *人= [NSArray的阵列]
的for（int i = 0; I＆LT; myPersonsCount;我++）{
   人= [人arrayByAddingObject：[[人页头]初始化];
}
 

还有一件事 - 这是有效的ARC启用的环境中，如果你要使用它，而不ARC不要忘了自动释放对象添加到数组！

  [人ADDOBJECT：[[[人页头] INIT]自动释放];
 

I'm pretty new to Objective-C and iOS so I've been playing around with the Picker View. I've defined a Person Class so that when you create a new Person it automatically gives that person a name and age.

#import "Person.h"

@implementation Person

@synthesize personName, age;

-(id)init
{
    self = [super init];
    if(self)
    {
        personName = [self randomName];
        age = [self randomAge];
    }

    return self;
}

-(NSString *) randomName
{
    NSString* name;
    NSArray* nameArr = [NSArray arrayWithObjects: @"Jill Valentine", @"Peter Griffin", @"Meg Griffin", @"Jack Lolwut",
                            @"Mike Roflcoptor", @"Cindy Woods", @"Jessica Windmill", @"Alexander The Great",
                            @"Sarah Peterson", @"Scott Scottland", @"Geoff Fanta", @"Amanda Pope", @"Michael Meyers",
                            @"Richard Biggus", @"Montey Python", @"Mike Wut", @"Fake Person", @"Chair",
                            nil];
    NSUInteger randomIndex = arc4random() % [nameArr count];
    name = [nameArr objectAtIndex: randomIndex];
    return name;
}

-(NSInteger *) randomAge
{
    //lowerBound + arc4random() % (upperBound - lowerBound);
    NSInteger* num = (NSInteger*)(1 + arc4random() % (99 - 1));

    return num;
}

@end

Now I want to make an array of Persons so I can throw a bunch into the picker, pick one Person and show their age. First though I need to make an array of Persons. How do I make an array of objects, initialize and allocate them?

解决方案

NSMutableArray *persons = [NSMutableArray array];
for (int i = 0; i < myPersonsCount; i++) {
   [persons addObject:[[Person alloc] init]];
}
NSArray *arrayOfPersons = [NSArray arrayWithArray:persons]; // if you want immutable array

also you can reach this without using NSMutableArray:

NSArray *persons = [NSArray array];
for (int i = 0; i < myPersonsCount; i++) {
   persons = [persons arrayByAddingObject:[[Person alloc] init]];
}

One more thing - it's valid for ARC enabled environment, if you going to use it without ARC don't forget to add autoreleased objects into array!

[persons addObject:[[[Person alloc] init] autorelease];

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