ios - 我想在我的方法中添加到我的数组而不是每次调用该方法时都重置它

Question

每次运行此方法时，都会创建并初始化我的数组。我怎样才能保持数组填充，直到

• 移动到另一个视图或

• 选择另一个按钮（我们称之为“重置”）。

  - (IBAction)addItemToOrder:(id)sender {
    NSMutableArray *arrayOrderItems = [[NSMutableArray alloc]init];
    NSMutableString *stringOrderItem = [[NSMutableString alloc]initWithString:@"Item: "];
    [stringOrderItem appendString:self.labelProductCode.text];
    [stringOrderItem appendString:@" | Qty: "];
    [stringOrderItem appendString:self.textfieldQuantity.text];
    NSObject *myObj = [[NSObject alloc]init];
    myObj = stringOrderItem;
    [arrayOrderItems addObject:myObj];
    self.textviewOrderTotal.text = stringOrderItem;
    NSLog(@"arrayOrderItems: #records: %d", arrayOrderItems.count);
    NSLog(@"%@", arrayOrderItems);
  }
  

Answer 1

您应该使用数组作为实例变量：

// MyClass.h
@interface MyClass : NSObject
    @property (nonatomic, strong) NSMutableArray *myArray;
@end

// MyClass.m
@implementation MyClass

- (id)init
{
    self = [super init];
    if (nil != self)
    {
        self.myArray = [NSMutableArray array];
    }
    return self;
}

- (IBAction)addItemToOrder:(id)aSender
{
    [self.myArray addObject:@"MyOrder"];
    NSLog(@"%@",testArray.description); 
}

@end