Objective-c PickerView显示内存位置，而不是来自singleton的对象变量名

Question

概述：我有一个MapKit地图、一个PickerView和一个武器对象的静态数组(每个武器都有一些成员变量数据(。目的是使用picker视图并在地图上显示一些信息(范围、名称(。

需要一些关于存储在我的Singleton中的对象数组的帮助。我成功地将数组传递到了映射中，但选择器显示的是对象的内存位置，而不是名称。

在SingletonFile.m中创建对象数组

static dispatch_once_t pred;
static SingletonFile *shared = nil;
dispatch_once(&pred, ^{
    shared = [[SingletonFile alloc] init];
    shared.theWeapons = [NSMutableArray arrayWithArray:
                         @[[[weapon alloc] initWithName:@"M16" weaponPicName:@"M16 Pic Name"],
                        [[weapon alloc] initWithName:@"M20" weaponPicName:@"M20 Pic Name"],
                           [[weapon alloc] initWithName:@"M3" weaponPicName:@"MyName"]
                           ]];
    //This is my attempt to create a second array with only the weaponPicName's from theWeapons array created above.
    shared.theWeaponNameArray = [shared.theWeapons valueForKey:@"weaponPicName"];
    //This line produces the error, not key value coding-compliant for the key weaponName
    //weaponName and weaponPicName are a part of the weapon object
});
return shared;

武器对象的Weapon.m构造函数

-(id)initWithName:(NSString*)weaponName weaponPicName:(NSString*)weaponPicName {
    self = [super init];
    if (self) {
        _weaponName = weaponName;
        _weaponPicName = weaponPicName;
    }
    return self;
}

MapViewController.m是我从我的单例类中获取武器数组的地方

//Initialize tableNames to the singleton name array for use in picker
self.tableNames = [SingletonFile weaponSingleton].theWeapons;

MapViewController.m(下面(是我的picker代码。

- (IBAction) pickType:(id)sender {
    arrayPickerRows = self.tableNames;
    [ActionSheetStringPicker showPickerWithTitle:@"Select"
                                            rows:arrayPickerRows
                                initialSelection:0
                                       doneBlock:^(ActionSheetStringPicker *picker, NSInteger selectedIndex, id selectedValue) {
                                           selectedRow = [arrayPickerRows objectAtIndex:selectedIndex];
                                           [self typePickerDone:sender];
                                       }
                                     cancelBlock:^(ActionSheetStringPicker *picker) {
                                         NSLog(@"Block Picker Canceled");
                                     }
                                          origin:sender];
}
- (void) typePickerDone:(UIButton*) sender {

    [self.WeaponPickerbutton setTitle:selectedRow forState:UIControlStateNormal];
}

我确信答案与访问对象的weaponName有关。我曾尝试使用valueForKey从对象数组中创建一个weaponNames数组，但它说我的键不符合值。

(也知道我可以用.plist完成所有这些，但我正在努力学习Singleton并使用对象数组(

Answer 1

您的arrayPickerRows存储一系列武器。当你为按钮设置标题时，所以当你使用[arrayPickerRows objectAtIndex:selectedIndex]时，你会得到索引为selectedIndex的武器地址。

在您的代码中，您没有变量selectedRow的定义。但是，它应该属于weapon类。设置按钮名称时，应使用以下代码：

[self.WeaponPickerbutton setTitle:selectedRow.weaponName forState:UIControlStateNormal];