UISwipeGestureRecognizer作為iOS中的側滑手勢其實是用的比較多的一個手勢.側滑手勢相較於Pan拖動手勢來說.一些特殊的方法啊,屬性啊,統統木有.開啟標頭檔案也只有簡潔的兩個屬性

@property(nonatomic) NSUInteger                        numberOfTouchesRequired __TVOS_PROHIBITED; // default is 1. the number of fingers that must swipe
@property(nonatomic) UISwipeGestureRecognizerDirection direction;               // default is UISwipeGestureRecognizerDirectionRight. the desired direction of the swipe. multiple directions may be specified if they will result in the same behavior (for example, UITableView swipe delete)
 

以及一個方向的列舉

typedef NS_OPTIONS(NSUInteger, UISwipeGestureRecognizerDirection) {
    UISwipeGestureRecognizerDirectionRight = 1 << 0,
    UISwipeGestureRecognizerDirectionLeft  = 1 << 1,
    UISwipeGestureRecognizerDirectionUp    = 1 << 2,
    UISwipeGestureRecognizerDirectionDown  = 1 << 3
};
 

注:側滑手勢容易與pan手勢衝突,建議pan手勢物件使用

requireGestureRecognizerToFail:

來避免手勢衝突