Question

在我的iOS应用程序中我尝试执行以下操作：在ViewController中有几个TextFields和一个Save按钮。当用户点击“保存”按钮时，yearTextField的文本必须存储在核心数据属性（todoYear：int32）上。这是我的Save方法的代码：

- (IBAction)SaveButtonAction:(id)sender {


    AppDelegate* appDelegate = [AppDelegate sharedAppDelegate];
    NSManagedObjectContext* context = appDelegate.managedObjectContext;

    NSManagedObject *favoriteThing = [NSEntityDescription insertNewObjectForEntityForName:@"FavoriteThing" inManagedObjectContext:context];
    NSString *todoText = ToDoTextField.text;
    NSNumber *todoYear = [yearTextField.text intValue];
    NSNumber *todoMonth = [monthTextField.text intValue];
    NSNumber *todoDay = [dayTextField.text intValue];
    NSNumber *todoHour = [hourTextField.text intValue];
    NSNumber *todoMinute = [minuteTextField.text intValue];        
    NSString *todoUrgent = urgentTextField.text;
    NSString *todoColor = colorTextField.text;


    [favoriteThing setValue:todoText forKey:@"thingName"];
    [favoriteThing setValue:[NSNumber numberWithInt:0] forKey:@"displayOrder"];
    [favoriteThing setValue:todoYear forKey:@"todoYear"];
    [favoriteThing setValue:todoMonth forKey:@"todoMonth"];
    [favoriteThing setValue:todoDay forKey:@"todoDay"];
    [favoriteThing setValue:todoHour forKey:@"todoHour"];
    [favoriteThing setValue:todoMinute forKey:@"todoMinute"];
    [favoriteThing setValue:todoUrgent forKey:@"urgent"];
    [favoriteThing setValue:todoColor forKey:@"color"];             

    NSError *error;
    if(! [context save:&error])
    {
        NSLog(@"Whoopw,couldn't save:%@", [error localizedDescription]);
    }
}

这是例外：

self    AddToDoViewController * 0x16578680  0x16578680
favoriteThing   FavoriteThing_FavoriteThing_ *  0x1650da90  0x1650da90
todoText    __NSCFString *  @"h"    0x1659f2b0
todoColor   __NSCFString *  @"Black"    0x16542070
todoUrgent  __NSCFString *  @"Not urgent"   0x165139e0
todoYear    NSNumber *  0x7dd   0x000007dd
todoMinute  NSNumber *  0x25    0x00000025
urgentTextField UITextField *   0x165bc2d0  0x165bc2d0
colorTextField  UITextField *   0x165b2de0  0x165b2de0
minuteTextField UITextField *   0x165b8380  0x165b8380

'todoText'，'todoColor'，'todourgent'的属性是正确的，读取'todoYear'属性的值时会出现错误。我不知道如何以正确的方式将'todoYear'值正确接受。提前谢谢。

Answer 1

使用NSNumber的{{1}}方法：

numberWithInt

或者将这一切组合成NSNumber *todoYear = [NSNumber numberWithInt: [yearTextField.text intValue]]; NSNumber *todoMonth = [NSNumber numberWithInt: [monthTextField.text intValue]]; NSNumber *todoDay = [NSNumber numberWithInt: [dayTextField.text intValue]]; NSNumber *todoHour = [NSNumber numberWithInt: [hourTextField.text intValue]]; NSNumber *todoMinute = [NSNumber numberWithInt: [minuteTextField.text intValue]]; ...

NSDate

iOS App：不兼容的指针类型

1 个答案: