Question

我创建了一个Xcode应用程序，在这种情况下使用核心数据框架存储用户输入评论（详细信息和评级0-5）。
所以基本上我已经设法创建了一个存储用户输入的视图控制器，然后将其显示在表视图控制器中。
然后，用户可以从表视图控制器中选择他们想要的任何现有评论，然后将其带到新的视图控制器，该控制器显示用户选择的特定评论。

问题是我已设法使用此代码显示字符串值＆＃34; [self.detailView setText:[self.managedObject valueForKey:@"detail"]];＆＃34;但我不能让它显示在核心数据中存储为整数（16）的评级值。

.h详细视图控制器

#import <UIKit/UIKit.h>
#import "reviewTableViewController.h"
#import "reviewViewController.h"
#import "Reviews.h"

@interface reviewDetailViewController : UIViewController <NSFetchedResultsControllerDelegate, UITextFieldDelegate> //adding fetched controller delegate and text field delegate

@property (strong, nonatomic) NSManagedObjectContext *managedObjectContext;
@property (strong, nonatomic) IBOutlet UITextView *detailView; //holds detail values
@property (nonatomic, strong) Reviews *reviews; //property for holding reviews
@property (strong) NSManagedObject *managedObject; //hold core data property
@property (strong, nonatomic) IBOutlet UILabel *ratingView; //holds rating values
@property (strong, nonatomic) IBOutlet UIButton *myButton;
@property (strong, nonatomic) IBOutlet UIButton *myButton1;    //buttons for borders

@end

.m详细视图控制器

- (void)viewDidLoad
{
    [super viewDidLoad];
    _myButton.layer.borderWidth = .5f;
    _myButton.layer.borderColor = [[UIColor lightGrayColor]CGColor];     //adding borders for tet displa using buttons, when screen loads
    _myButton1.layer.borderWidth = .5f;
    _myButton1.layer.borderColor = [[UIColor lightGrayColor]CGColor];

    [self.detailView setText:[self.managedObject valueForKey:@"detail"]]; //displaying detail value
    //[self.ratingView setText:[self.managedObject valueForKey:@"rating"]];
    //[self.ratingView setValue:[NSNumber numberWithInteger:managedObject]         forKey:@"rating"];//displaying rating value
     //[self.puzzle setValue:[NSNumber numberWithInt:timeTaken] forKey:@"bestTime"];



}

.m表视图控制器

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    //  Get a reference to our detail view


//  Pass the managed object context to the destination view controller
 //  [super prepareForSegue:segue sender:sender];
    //  If we are editing a picture we need to pass some stuff, so check the segue title first
    if ([[segue identifier] isEqualToString:@"detailSegue"]) //using segue link name given
        {
          //Get the row we selected to view
            NSManagedObject *managedObjects = [self.reviewsArray objectAtIndex:[[self.tableView indexPathForSelectedRow] row]]; //choosing the selected cell value
            reviewDetailViewController *destViewController = segue.destinationViewController;
            destViewController.managedObject = managedObjects; //displaying it in the destination controller



    }

}

Answer 1

您需要将整数转换为字符串。

[self.ratingView setText:[NSString stringWithFormat:@"%@", [self.managedObject valueForKey:@"rating"]]];

Answer 2

NSNumber *x = managedObject.rating; // rating is NSNumber!
int y       = x.intValue;           // this is how you get an int!

label.text = [NSString stringWithFormat:@"%i", managedObject.rating.intValue];

在标签或文本视图中使用核心数据显示整数值（目标C）

2 个答案: