UIGestureRecognizer-永远不会调用重置

Question

我正在创建自定义手势识别器。 问题在于，永远不会调用reset方法，因此我无法重置识别器的状态。 因此，它只能在第一次使用

@implementation TouchGestureRecognizer {

    UIGestureRecognizerState mState;
}

-(UIGestureRecognizerState) state {
    return mState;
}

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    if( [touches count] == 1 ) {
        mState = UIGestureRecognizerStateBegan;
    }
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    if( [touches count] == 1 ) {
        mState = UIGestureRecognizerStateChanged;
    }
}

- (void)reset {
    mState = UIGestureRecognizerStatePossible;
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    mState = UIGestureRecognizerStateRecognized;
}

@end

Answer 1

该文档指出：

将手势识别器状态设置为UIGestureRecognizerStateEnded或UIGestureRecognizerStateRecognized后，运行时将调用此方法。

看来这就是您在touchesEnded:中所做的。 在此方法中放置一个断点，然后从那里获取它。

Answer 2

您必须将其写入.h文件中。

#import <UIKit/UIGestureRecognizerSubclass.h>