带有属性的NSMutableArray

Question

我想设置一个名称，价格，参考......作为属性的NSMutableArray。

像这样：

NSMutableArray *items;
NSString *name;
NSString *price;
NSString *reference;

然后以这种方式将它们添加到数组中：

items[0].name = @"Oven-3000";
items[0].price = @"200€";
items[0].reference = @"231323-1";

items[0].name = @"Oven-3050";
items[0].price = @"250€";
items[0].reference = @"231312-1";

items[0].name = @"Oven-3200";
items[0].price = @"210€";
items[0].reference = @"900023-1";

THX。

Answer 1

我建议使用特殊的NSObject子类。

但如果您不想这样做，可以使用NSDictionary：

NSMutableArray *array = [NSMutableArray array];
[array addObject:@{@"name": @"Oven-3000",
                   @"price": @"200€",
                   @"reference": @"900023-1"}];

[array addObject:@{@"name": @"Oven-3050",
                   @"price": @"250€",
                   @"reference": @"900023-1"}];

[array addObject:@{@"name": @"Oven-3200",
                   @"price": @"210€",
                   @"reference": @"900023-1"}];

访问：

array[0][@"name"];
array[0][@"price"];
array[0][@"reference"];

Answer 2

如果你想采用NSObject路线，就可以这样做。

首先从NSObjectClass创建一个新文件，并将其命名为ItemObject：

现在在你的.H文件中创建属性（名称，价格，参考）并添加方法：

在ItemObject类的.M文件中添加此方法体：

你的NSObject现在已经完成了！要在任何ViewController中使用它，请在de .M文件中添加#import“ItemObject”：

要创建一个对象，请填充它，将其添加到数组并使用以下方法读取它：

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.

//create objects
ItemObject * item = [[ItemObject alloc]initWithName:@"name1" andPrice:@"price1" andReference:@"reference1"];
ItemObject * item2 = [[ItemObject alloc]initWithName:@"name2" andPrice:@"price2" andReference:@"reference2"];
ItemObject * item3 = [[ItemObject alloc]initWithName:@"name3" andPrice:@"price3" andReference:@"reference3"];

//edit properties
item.name = @"changedTheName";
item.price = @"changedThePrice";
item.reference = @"changedTheReference";

//add to NSMutableArray
NSMutableArray * mutableArray = [NSMutableArray arrayWithObjects:item, item2, item3, nil];

//reading from array
ItemObject * itemRetrieved = mutableArray[0]; //first object

//logging content
NSLog(@"itemRetrieved.name:%@",itemRetrieved.name);
}

日志将显示：

Answer 3

使用NSDictionary准备您的数据，如下所示。

NSMutableArray *items=[[NSMutableArray alloc] init];

[items addObject:@{@"name":@"Oven-3000",@"price":@"200€",@"reference":@"231323-1"];
[items addObject:@{@"name":@"Oven-3050",@"price":@"250€",@"reference":@"231312-1"];
[items addObject:@{@"name":@"Oven-3200",@"price":@"210€",@"reference":@"900023-1"];

然后获取

for(NSDictionary *dic in items){

   NSLog(@"Name = %@, Price = %@, Reference = %@",[dic objectForKey:@"name"],[dic objectForKey:@"price"],[dic objectForKey:@"reference"])

}

另一种方式 根据评论中的建议，创建自己的属性。 只需创建一个NSObject类型的类，然后添加属性，然后分配。

MyClass.h

@interface MyClass:NSObject
@property(nonatomic, strong) NSString *name;
@property(nonatomic, strong) NSString *price;
@property(nonatomic, strong) NSString *reference;
@end

MyClass.m

@implementation MyClass
@end

然后

MyClass *obj=[[MyClass alloc] init];
obj.name=@"Oven-3000";
obj.price=@"200€";
obj.reference=@"900023-1";

[items addObject:obj];

Answer 4

创建新文件名是NSObject的产品子类 在Product.h文件中

#import <Foundation/Foundation.h>

@interface Product : NSObject
@property (nonatomic, retain) NSString *name; //your product name ,arc u use "strong" in place of "retain"
@property (nonatomic, retain) NSString *price; //product price
@property (nonatomic, retain) NSString *reference;//product reference


- (id)initWithProductName:(NSString *)Productname productPrice:(NSString *)Productprice withProdctReference:(NSString *)Productreference; //this is the initilizer for your product object
 @end

<{1>}文件中的

Product.m

在其他一些课程中你需要创建Product的对象，然后只需 #import "Product.h" @implementation Product @synthesize name; @synthesize price; @synthesize reference; //initilise the product object - (id)init { self = [super init]; if(self) { //because u dont hav any values for it self.name = nil; self.price = nil; self.reference = nil; } return self; } //initilise the objec with details - (id)initWithProductName:(NSString *)Productname productPrice:(NSString *)Productprice withProdctReference:(NSString *)Productreference { self = [super init]; if(self) { self.name = Productname; self.price = Productprice; self.reference = Productreference; } return self; } @end

如下所示

#import "Product.h"

Answer 5

我认为这是Objective-c方式中最接近的答案：

@interface Item : NSObject
@property NSString *name, *price, *reference;
@end

@implementation Item
- (NSString *)description {
  return [NSString stringWithFormat:@"{name: %@, price: %@, reference: %@}", self.name, self.price, self.reference];
}
@end

@interface ItemCollection : NSObject {
  NSMutableArray *items;
}
- (Item *)objectAtIndexedSubscript:(NSUInteger)idx NS_AVAILABLE(10_8, 6_0);
- (void)setObject:(Item *)obj atIndexedSubscript:(NSUInteger)idx NS_AVAILABLE(10_8, 6_0);
@end

@implementation ItemCollection

- (id)init {
  if ((self = [super init])) {
    self->items = [[NSMutableArray alloc] init];
  }
  return self;
}

- (Item *)objectAtIndexedSubscript:(NSUInteger)idx {
  return [self->items objectAtIndexedSubscript:idx];
}

- (void)setObject:(Item *)obj atIndexedSubscript:(NSUInteger)idx {
  [self->items setObject:obj atIndexedSubscript:idx];
}

- (NSString *)description {
  return [self->items description];
}

@end

int main(int argc, const char * argv[])
{
  @autoreleasepool {
    ItemCollection *items = [[ItemCollection alloc] init];
    items[0] = [[Item alloc] init];
    items[0].name = @"Apple";
    items[0].price = @"$0.99";
    items[0].reference = @"???";

    items[1] = [[Item alloc] init];
    items[1].name = @"Orange";
    items[1].price = @"$0.99";
    items[1].reference = @"AAA";

    NSLog(@"%@", items);
  }

  return 0;
}

还有其他一些方法，例如使用struct 数组或使用指针数组，但我不能让它们在ARC环境中工作。