为UIView添加上下左右滑动操作
方法一：
在viewDidLoad时为UIView添加操作
#define HORIZ_SWIPE_DRAG_MIN 12#define VERT_SWIPE_DRAG_MAX 4CGPoint startTouchPosition;NSString *dirString ;- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{UITouch *touch = touches.anyObject;startTouchPosition = [touch locationInView:self.view];}- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = touches.anyObject; CGPoint currentTouchPosition = [touch locationInView:self.view]; if (fabsf(startTouchPosition.x - currentTouchPosition.x) >= HORIZ_SWIPE_DRAG_MIN && fabsf(startTouchPosition.y - currentTouchPosition.y) <= VERT_SWIPE_DRAG_MAX) { // Horizontal Swipe if (startTouchPosition.x < currentTouchPosition.x) { NSLog(@"from left"); dirString = @"left"; } else{ NSLog(@"from right"); dirString = @"right";}} else if (fabsf(startTouchPosition.y - currentTouchPosition.y) >= HORIZ_SWIPE_DRAG_MIN && fabsf(startTouchPosition.x - currentTouchPosition.x) <= VERT_SWIPE_DRAG_MAX) { // Vertical Swipe if (startTouchPosition.y < currentTouchPosition.y) { NSLog(@"from bottom");dirString = @"bottom";} else {NSLog(@"from top");dirString = @"top";} } else { //dirString = @"";} } - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{if (dirString == @"right") {NSLog(@"event right");}else if (dirString == @"left") {NSLog(@"event left");}}