如何使我的自定义手势识别器类实例同时工作？

Question

You can download code example from this libk: https://github.com/mriddi/ExempleCustomGestureRecognizer.git

I create my cusom gesture recognizer class like this:

@protocol MyGestureRecognizerDelegate <UIGestureRecognizerDelegate>
@optional
-(void) willDo;
@end

@interface MyGestureRecognizer: UIGestureRecognizer
{
    …
}
@property (nonatomic, assign) id <MyGestureRecognizerDelegate> delegate;
…
@end

@implementation MyGestureRecognizer
@synthesize delegate;
…
-(void) call{
    [delegate willDo];
}
…
@end

My ViewController adopt MyGestureRecognizerDelegate protocol. In ViewController I create instances of my class:

MyGestureRecognizer * grFerst;
MyGestureRecognizer * grSecond;
grFerst.delegate=self;
grLeft.delegate=self;
[self.view addGestureRecognizer: grFerst];
[self.view addGestureRecognizer: grSecond];

I want to make both gesture recognizers instances to work simultaneously. I try to add to my ViewController method

shouldRecognizeSimultaneouslyWithGestureRecognizer

but this method never calls, I checked it using NSLog function.

Please help me solve this problem (allow work both gesture recognizers simultaneously).

Answer 1

Maybe you should allocate the Gestures

MyGestureRecognizer * gesture = [[MyGestureRecognizer alloc] initWithTarget:self action:nil];
gesture.delegate = self;
[self.view addGestureRecognizer:gesture];

Or you could use the control wheel as the target and do all your angle calculations in there. Then you delegate back to the mainViewController.