使用手勢在父視圖中移動UIView

Question

我想在使用UIPanGestureRecognizer的父視圖中移動視圖。 我正在使用下面的代碼。

-(void)move:(UIPanGestureRecognizer *)recognizer {
    CGPoint touchLocation = [recognizer locationInView:self.customeView];

    self.view.center = touchLocation;
}

我想使用locationInView而不是translationInView移動視圖。 誰能幫助我如何使用locationInView在父視圖中移動視圖？

Answer 1

使用UIPanGestureRecognizer您將走上正確的UIPanGestureRecognizer 。 您可能缺少開始和結束手勢狀態處理。 這是一個完整的解決方案，我剛剛將它與panView一起放在示例項目（Swift）中，將其作為視圖控制器根視圖的子類。

class ViewController: UIViewController {

    @IBOutlet weak var panView: UIView!

    // records the view's center for use as an offset while dragging
    var viewCenter: CGPoint!

    override func viewDidLoad() {
        super.viewDidLoad()
        panView.addGestureRecognizer(UIPanGestureRecognizer(target: self, action: #selector(self.dragView)))
    }

    func dragView(gesture: UIPanGestureRecognizer) {
        let target = gesture.view!

        switch gesture.state {
        case .began, .ended:
            viewCenter = target.center
        case .changed:
            let translation = gesture.translation(in: self.view)
            target.center = CGPoint(x: viewCenter!.x + translation.x, y: viewCenter!.y + translation.y)
        default: break
        }
    }

}

Answer 2

你可以試試這個

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIView *panView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    //self.panView = self.panView -> self.view . self.panView is direct child of self.view

    UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(move:)];
    [self.panView addGestureRecognizer:panRecognizer];


    // Do any additional setup after loading the view, typically from a nib.
}

-(void)move:(UIPanGestureRecognizer *)recognizer {
    CGPoint centerPoint = [recognizer locationInView:self.view];
    self.panView.center = centerPoint;
}
}