Question

我有以下代码，无法获取保存的项目：

-(IBAction)saveButtonClicked:(UIButton *)sender  
{  

   [myViewModel.itemsList addObject:myViewModel.items];
   NSLog(@"Length of array .. %d", myViewModel.itemsList.count);

}

上面，我保存了我的对象数组，下面尝试获取相同的对象数组。但是，对象数组（itemsList的items对象有属性名和desc。当我尝试获取myArray.name时，它说没有这样的属性。

-(IBAction)submitButtonClicked:(UIButton *)sender
{
      UIAlertView *alert= [[UIAlertView alloc] initWithTitle:[NSString stringWithFormat:@"Successful!"] message:@"Submitted successfuly!" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
     [alert show];


    for(int i = 0; i< myViewModel.itemsList.count; i++){
    NSLog(@"Array..%@", [myViewModel.itemsList objectAtIndex:i]);
    NSObject *myArray = [myViewModel.itemsList objectAtIndex:i];

   }
 }

Answer 1

而不是：

NSObject *myArray = [myViewModel.itemsList objectAtIndex:i];

执行：

WhateverYourCustomObjectClassIsCalled *myArray = [myViewModel.itemsList objectAtIndex:i];

Answer 2

这几乎可以肯定是从数组中获取对象时你使用了错误的类型：

NSObject *myArray = [myViewModel.itemsList objectAtIndex:i];

应该是：

MyCustomObject *item = [myViewModel.itemsList objectAtIndex:i];

还可以使用快速枚举，错误，更快捷，更方便：

for (MyCustomObject *item in myViewModel.itemsList) {
    NSLog(@"name=%@", item.name);
}

顺便说一句，这个会起作用：

for (id item in myViewModel.itemsList) {
    NSLog(@"name=%@", [item name]);
}

在iOS中的NSMutablearray中获取我的属性值

2 个答案: