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Get swipe direction in Cocoa Touch：UISwipeGestureRecognizer只能同时支持一个方向

2012-11-27 13:57 495 查看

I am trying to catch a gesture but it does not work. Here is my code:

UISwipeGestureRecognizer *recognizer;
recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];
[recognizer setDirection:(UISwipeGestureRecognizerDirectionRight | UISwipeGestureRecognizerDirectionLeft)];
[[self view] addGestureRecognizer:recognizer];
[recognizer release];

and

-(void)handleSwipeFrom:(UISwipeGestureRecognizer *)recognizer {
NSLog(@"get gesture");
if (recognizer.direction == UISwipeGestureRecognizerDirectionRight) {
NSLog(@"get gesture right");
}
if (recognizer.direction == UISwipeGestureRecognizerDirectionLeft) {
NSLog(@"get gesture Left");
}
}

It always gets a gesture but does not recognize the direction. I also tried

if(recognizer.direction){NSLog(@"get
gesture");}

and it also worked, so I do not understand where I made the mistake.

Thanks for any help.

19down
voteaccepted

You're not using the

UISwipeGestureRecognizer

correctly.
Its direction is always going to be what you've set it to (in this case

UISwipeGestureRecognizerDirectionRight
| UISwipeGestureRecognizerDirectionLeft

, or 3).

If you want to capture swipes left and right that you can differentiate between, you'll have to set up a separate recognizer for each. Apple does this in their SimpleGestureRecognizers
sample.

19down
voteaccepted

You're not using the

UISwipeGestureRecognizer

correctly.
Its direction is always going to be what you've set it to (in this case

UISwipeGestureRecognizerDirectionRight
| UISwipeGestureRecognizerDirectionLeft

3down
vote

What you have to do is just change the codes for adding gesture recognizer.

UISwipeGestureRecognizer *leftRecognizer;
leftRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];
[leftRecognizer setDirection: UISwipeGestureRecognizerDirectionLeft];
[[self view] addGestureRecognizer:leftRecognizer];
[leftRecognizer release];

UISwipeGestureRecognizer *rightRecognizer;
rightRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];
[rightRecognizer setDirection: UISwipeGestureRecognizerDirectionRight];
[[self view] addGestureRecognizer:rightRecognizer];
[rightRecognizer release];

19down
voteaccepted

You're not using the

UISwipeGestureRecognizer

correctly.
Its direction is always going to be what you've set it to (in this case

UISwipeGestureRecognizerDirectionRight
| UISwipeGestureRecognizerDirectionLeft

3down
vote

What you have to do is just change the codes for adding gesture recognizer.

UISwipeGestureRecognizer *leftRecognizer;
leftRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];
[leftRecognizer setDirection: UISwipeGestureRecognizerDirectionLeft];
[[self view] addGestureRecognizer:leftRecognizer];
[leftRecognizer release];

UISwipeGestureRecognizer *rightRecognizer;
rightRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];
[rightRecognizer setDirection: UISwipeGestureRecognizerDirectionRight];
[[self view] addGestureRecognizer:rightRecognizer];
[rightRecognizer release];

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