Question

我需要按照标准距离（例如水平或垂直1个单位）移动网格板上的对象，具体取决于我是水平还是垂直滑动一个手指。我提到的距离是固定的，方向取决于我是从下到上，从左到右，反之亦然。

它将更像是这个游戏： https://www.youtube.com/watch?v=SuD_Ripl-MU

我制作此代码但它只检测左/右：

@interface ViewController()
@property (nonatomic, strong) UISwipeGestureRecognizer *leftSwipeGestureRecognizer;
@property (nonatomic, strong) UISwipeGestureRecognizer *rightSwipeGestureRecognizer;
@end

@implementation ViewController

- (IBAction)HandlePan:(UIPanGestureRecognizer *)recognizer{
    CGPoint translation = [recognizer translationInView:self.view];
    recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x, recognizer.view.center.y + translation.y);
    [recognizer setTranslation:CGPointMake(0,0) inView:self.view];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.leftSwipeGestureRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipes:)];
    self.rightSwipeGestureRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipes:)];

    self.leftSwipeGestureRecognizer.direction = UISwipeGestureRecognizerDirectionLeft;
    self.rightSwipeGestureRecognizer.direction = UISwipeGestureRecognizerDirectionRight;

    [self.view addGestureRecognizer:self.leftSwipeGestureRecognizer];
    [self.view addGestureRecognizer:self.rightSwipeGestureRecognizer];
}

- (void)handleSwipes:(UISwipeGestureRecognizer *)sender
{
    if (sender.direction == UISwipeGestureRecognizerDirectionLeft)
    {
        CGPoint labelPosition = CGPointMake(self.pesawat.frame.origin.x - 30.0, self.pesawat.frame.origin.y);
        self.pesawat.frame = CGRectMake( labelPosition.x , labelPosition.y , self.pesawat.frame.size.width, self.pesawat.frame.size.height);
     }

    if (sender.direction == UISwipeGestureRecognizerDirectionRight)
    {
        CGPoint labelPosition = CGPointMake(self.pesawat.frame.origin.x + 30.0, self.pesawat.frame.origin.y);
     self.pesawat.frame = CGRectMake( labelPosition.x , labelPosition.y , self.pesawat.frame.size.width, self.pesawat.frame.size.height);
    }
}

如何向上/向下添加手势并以平滑的手势实现滑动（在我的代码上，它会立即移动到新位置，如果我从屏幕上释放手指，我希望对象移动到新位置）？

Answer 1

UISwipeGestureRecognizerDirection enums

typedef enum {
   UISwipeGestureRecognizerDirectionRight = 1 << 0,
   UISwipeGestureRecognizerDirectionLeft  = 1 << 1,
   UISwipeGestureRecognizerDirectionUp    = 1 << 2,
   UISwipeGestureRecognizerDirectionDown  = 1 << 3
} UISwipeGestureRecognizerDirection;

我相信您必须添加两个额外的 swipeGestureRecognisers，其中包含路线UISwipeGestureRecognizerDirectionUp和UISwipeGestureRecognizerDirectionDown。那样可以解决你的问题。

例如，用于向上滑动

@property (nonatomic, strong) UISwipeGestureRecognizer *upSwipeGestureRecognizer;

self.upSwipeGestureRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipes:)];
self.upSwipeGestureRecognizer.direction = UISwipeGestureRecognizerDirectionUp;


- (void)handleSwipes:(UISwipeGestureRecognizer *)sender
{
   .....
   if (sender.direction == UISwipeGestureRecognizerDirectionUp)
   {
     //add your code here.
   }
}

Answer 2

UIPanGestureRecognizer足以完成此任务。只需检查UIPanGesture的statebegan和stateEnd属性的转换差异，并根据velocity参数转换视图。喜欢 -

if(velocity > 0) {

//your down/right movement

}
else {

//your left or up movement

}

仅按标准距离垂直/水平滑动

2 个答案: