将 UIView 中可拖动按钮的位置保存到核心数据中

Question

我希望能够将用户在单击添加按钮（在导航栏中）时创建的 UIView 中的可拖动按钮的位置保存到核心数据中，以便在用户保存数据时并从核心数据创建的 tableview 单元调用它，它位于用户保存它的同一位置。我已经设置了我的核心数据我只是想知道我应该使用 NSKeyedArchiver 还是其他东西来解决这个问题的最佳方法是什么。这是我的代码，这里有一些图片可以更好地理解。

图表.m

@interface ChartViewController ()

@end

@implementation ChartViewController

-(void)viewDidLoad{
    [super viewDidLoad];

    self.title = @"Chart";


}


- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(nullable UIEvent *)event {
    UITouch *aTouch = [touches anyObject];

    CGRect buttonRect = self.buttonField.frame;


    CGPoint point = [aTouch locationInView:self.buttonField.superview];



    if (!CGRectContainsPoint(buttonRect, point)) {
            _buttonField.layer.borderColor = [UIColor blackColor].CGColor;
            _draggedView.layer.borderColor = [UIColor blackColor].CGColor;
        for (_buttonField in self.view.subviews) {
            _buttonField.layer.borderColor = [UIColor blackColor].CGColor;

        }

    }


}

- (void)longPress:(UILongPressGestureRecognizer*)gesture {
    if ( gesture.state == UIGestureRecognizerStateBegan ) {
        gesture.view.layer.borderColor = [UIColor whiteColor].CGColor;


        UIAlertController * alert=   [UIAlertController
                                      alertControllerWithTitle:@"Would you like to delete the selected rep(s)?"
                                      message:nil
                                      preferredStyle:UIAlertControllerStyleAlert];

        UIAlertAction* deleteButton = [UIAlertAction
                                    actionWithTitle:@"Delete"
                                    style:UIAlertActionStyleDefault
                                    handler:^(UIAlertAction * action)

                                       {
                                           for (_buttonField in self.view.subviews) {
                                               if ([[UIColor colorWithCGColor:_buttonField.layer.borderColor] isEqual:[UIColor whiteColor]]) {

                                                   [_buttonField removeFromSuperview];

                                               }
                                           }

                                        [alert dismissViewControllerAnimated:YES completion:nil];

                                    }];
        UIAlertAction* cancelButton = [UIAlertAction
                                   actionWithTitle:@"Cancel"
                                   style:UIAlertActionStyleDefault
                                   handler:^(UIAlertAction * action)
                                       {






                                       [alert dismissViewControllerAnimated:YES completion:nil];

                                   }];

        [alert addAction:deleteButton];
        [alert addAction:cancelButton];

        [self presentViewController:alert animated:YES completion:nil];
    }
}




- (void)panWasRecognized:(UIPanGestureRecognizer *)panner {
    {

        panner.view.layer.borderColor = [UIColor whiteColor].CGColor;


       _draggedView = panner.view;

        CGPoint offset = [panner translationInView:_draggedView.superview];
        CGPoint center = _draggedView.center;
        _draggedView.center = CGPointMake(center.x + offset.x, center.y + offset.y);


        _draggedView.layer.masksToBounds =YES;
        _buttonField.layer.borderWidth = 3.0f;


        // Reset translation to zero so on the next `panWasRecognized:` message, the
        // translation will just be the additional movement of the touch since now.
        [panner setTranslation:CGPointZero inView:_draggedView.superview];

    }

}

-(void)buttonTouched:(UIButton*)sender forEvent:(id)tap {
    NSSet *touches = [tap allTouches];
    UITouch *touch = [touches anyObject];
    touch.view.layer.borderColor = [UIColor whiteColor
                                    ].CGColor;
}


-(void)doubleTapped:(UIButton*)sender forEvent:(id)twoTaps {
    NSSet *touches = [twoTaps allTouches];
    UITouch *touch = [touches anyObject];
    touch.view.layer.borderColor = [UIColor blackColor].CGColor;

}
- (IBAction)saveButton:(UIBarButtonItem*)saveRep {


    saveCount ++;
    if (saveCount == 1) {

        self.title = @"Chart";


        for (_buttonField in self.view.subviews) {


            _buttonField.userInteractionEnabled = NO;

            _buttonField.layer.borderColor = [UIColor blackColor].CGColor;


            saveCount = 0;

        }
    }
}
- (IBAction)editButton:(UIBarButtonItem*)editRep {


    editCount ++;
    if (editCount == 1) {

        self.title = @"Edit Mode";


        for (_buttonField in self.view.subviews) {

            _buttonField.userInteractionEnabled = YES;


            editCount = 0;
        }

    }
}


- (IBAction)addRepButton:(UIBarButtonItem *)newRep {

    self.labelCounter++;

    buttonCount ++;
    if (buttonCount > 0 )
    {

        _buttonField = [[UIButton alloc]initWithFrame:CGRectMake(300, 300, 28, 28)];
        [_buttonField setTitle:[NSString stringWithFormat:@"%i", self.labelCounter]forState:UIControlStateNormal];
        _buttonField.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;
        _buttonField.userInteractionEnabled = YES;
        _buttonField.layer.cornerRadius = 14;
        _buttonField.layer.borderColor = [UIColor blackColor].CGColor;
        _buttonField.layer.borderWidth = 3.0f;
        _buttonField.titleLabel.font = [UIFont boldSystemFontOfSize:13];
        [_buttonField setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
        _buttonField.layer.backgroundColor = [UIColor blackColor].CGColor;
        _buttonField.layer.masksToBounds = YES;


        //Pan gesture declared in button
        UIPanGestureRecognizer *panner = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panWasRecognized:)];
        [_buttonField addGestureRecognizer:panner];

        //Long Press gesture declared in button
        UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
        [self.buttonField addGestureRecognizer:longPress];

        //Touch down inside declared in button
        [self.buttonField addTarget:self action:@selector(buttonTouched:forEvent:) forControlEvents:UIControlEventTouchDown];

        //Double Tap inside declared in button
        [self.buttonField addTarget:self action:@selector(doubleTapped:forEvent:) forControlEvents:UIControlEventTouchDownRepeat];


        [self.view addSubview:(_buttonField)];




    }


}

- (void) saveData {
    NSMutableDictionary *dataDict = [[NSMutableDictionary alloc] initWithCapacity:3];
    if (_buttonField != nil) {
        [dataDict setObject:_buttonField forKey:@"placement"];  // save the placement array
    }

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectoryPath = [paths objectAtIndex:0];
    NSString *filePath = [documentsDirectoryPath stringByAppendingPathComponent:@"Rep"];

    [NSKeyedArchiver archiveRootObject:dataDict toFile:filePath];
}

Picture of ViewController

当用户按下完成时，我想将它从那里保存到核心数据中。谢谢！！

Answer 1

在您的数据模型中添加一个名为 boundingRect 之类的可转换对象。然后，当您的用户完成拖动按钮时，请说出类似以下内容：

managedObject.boundingRect = [NSValue valueWithCGRect:button.frame];

然后当你想从数据库中读取它时说：

UIButton *button = [[UIButton alloc]initWithFrame: [managedObject.boundingRect CGRectValue]];

Answer 2

对于 CGRect 还有一个简单的解决方法，即使用字符串，它已经是 Core Data 中的标准数据类型。

// Swift and Objective-C
object.rect = NSStringFromCGRect(frame)
view.frame = CGRectFromString(object.rect)

虽然 NSValue 也是一个不错的选择，但这也非常 可读性 。

将 UIView 中可拖动按钮的位置保存到核心数据中

Saving Placement of a Draggable Button within the UIView into Core Data

core-data

objective-c

draggable

uiview

ios