Question

我需要一些认真的帮助。我正在目标c中构建键盘应用程序，而我拥有的功能之一是在键盘屏幕周围拖动键盘按钮，以便用户可以将它们放置在任何位置。但是我的问题是，我无法弄清楚如何在拖动后保存每个按钮的位置，以便在用户关闭然后再打开时，所有键盘按钮都位于用户之前放置它们的位置。

我的代码如下：

这在我的viewDidLoad中：

for (UIButton *button in self.allButtonsArray) {
        UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc]
                                                        initWithTarget:self
                                                        action:@selector(handlePanGestureButtons:)];

        [button addGestureRecognizer:panGestureRecognizer];

    }

平移方法：

(void) handlePanGestureButtons:(UIPanGestureRecognizer *)gesture {

    NSString *_valueOfDragging= [defaults stringForKey:@"stateOfSwitchButtonDragging"];

    if([_valueOfDragging compare:@"ON"] == NSOrderedSame){

        if (gesture.state==UIGestureRecognizerStateChanged || gesture.state == UIGestureRecognizerStateEnded){
            UIView *superview = gesture.view.superview;
            CGSize superviewSize = superview.bounds.size;
            CGSize thisSize = gesture.view.frame.size;
            CGPoint translation = [gesture translationInView:self.view];
            CGPoint center = CGPointMake(gesture.view.center.x + translation.x,
                                         gesture.view.center.y + translation.y);

            CGPoint resetTranslation = CGPointMake(translation.x, translation.y);

            if(center.x - thisSize.width/2 < 0)
                center.x = thisSize.width/2;
            else if (center.x + thisSize.width/2 > superviewSize.width)
                center.x = superviewSize.width-thisSize.width/2;
            else
                resetTranslation.x = 0;

            if(center.y - thisSize.height/2 < 0)
                center.y = thisSize.height/2;
            else if(center.y + thisSize.height/2 > superviewSize.height)
                center.y = superviewSize.height-thisSize.height/2;
            else
                resetTranslation.y = 0; //Only reset the vertical translation if the view *did* translate vertically

            gesture.view.center = center;
            [gesture setTranslation:CGPointMake(0, 0) inView:self.view];

        }
    }

Answer 1

您可以将所有坐标存储在NSUserDefaults中，您可以在打开应用时再次访问。由于坐标是CGPoint值，因此您需要先使用NSStringFromCGPoint将它们转换为字符串对象。然后，您可以使用所有按钮的坐标创建一个数组，并将它们写入您的用户默认设置。为了能够识别每个按钮，可以制作一个结构数组，例如：

struct KeyCoordinate {
    NSString *keyIdentifier;
    NSString *keyCoordinate;
}

struct KeyCoordinate keyCoordinate1;
struct KeyCoordinate keyCoordinate2;

keyCoordinate1.keyIdentifier = @"key1"
keyCoordinate1.keyCoordinate = NSStringFromCGPoint(key1Point);
keyCoordinate2.keyIdentifier = @"key2"
keyCoordinate2.keyCoordinate = NSStringFromCGPoint(key2Point);

NSArray *buttonCoordinatesArray = @[keyCoordinate1, keyCoordinate2, ...];

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];

// write:
[userDefaults setObject: buttonCoordinatesArray forKey: @"buttonCoordinatesArray"];

// read:
NSArray *buttonCoordinatesArray = [userDefaults objectForKey: @"buttonCoordinatesArray"];

要从字符串还原为点，请使用CGPointFromString。

或者，您也可以将点作为NSValue存储在结构中，但是想法保持不变。

拖动后将每个按钮的位置保存在数组中

1 个答案: