仅垂直/水平滑动标准距离答案

【问题标题】：swipe only vertical/horizontal by standard distance仅垂直/水平滑动标准距离
【发布时间】：2014-03-19 18:06:59
【问题描述】：

我需要将网格板上的对象移动标准距离（例如水平或垂直1个单位），具体取决于我是水平还是垂直滑动一根手指。正如我提到的，距离是固定的，方向取决于我是从下到上，从左到右还是从左到右。

它会更像这个游戏： https://www.youtube.com/watch?v=SuD_Ripl-MU

我编写了这段代码，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);
    }
}

如何添加向上/向下手势并以平滑手势实现滑动（在我的代码中，它会立即移动到新位置，如果我从屏幕上松开手指，我希望对象移动到新位置）？

【问题讨论】：

标签： ios iphone objective-c swipe

【解决方案1】：

UISwipeGestureRecognizerDirection enums

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

我相信你必须添加 两个额外的 swipeGestureRecognisers 有方向 UISwipeGestureRecognizerDirectionUp 和 UISwipeGestureRecognizerDirectionDown。那会解决你的问题。

例如，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.
   }
}

【讨论】：

【解决方案2】：

UIPanGestureRecognizer 可以单独完成这项任务。只需检查 UIPanGesture 的 statebegan 和 stateEnd 属性的翻译差异，并根据速度参数翻译您的视图。喜欢 -

if(velocity > 0) {

//your down/right movement

}
else {

//your left or up movement

}

【讨论】：