UIGestureRecognizer-永遠不會調用重置

Question

我正在創建自定義手勢識別器。 問題在於，永遠不會調用reset方法，因此我無法重置識別器的狀態。 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

該文檔指出：

將手勢識別器狀態設置為UIGestureRecognizerStateEnded或UIGestureRecognizerStateRecognized后，運行時將調用此方法。

看來這就是您在touchesEnded:中所做的。 在此方法中放置一個斷點，然后從那里獲取它。

Answer 2

您必須將其寫入.h文件中。

#import <UIKit/UIGestureRecognizerSubclass.h>