Question

我想将自定义识别器的手势移除到imageview。这是来自kerby特纳的一个手指旋转。

-(void) enableRotation{
[[self mainImageView] setUserInteractionEnabled:YES];
[self addRotationGestureToView:[self mainImageView]];
    //[self addTapGestureToView:[self mainImageView] numberOfTaps:1];
}

- (void)addTapGestureToView:(UIView *)view numberOfTaps:(NSInteger)numberOfTaps
{
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapped:)];
[tap setNumberOfTapsRequired:numberOfTaps];
[view addGestureRecognizer:tap];
 }

- (void)addRotationGestureToView:(UIView *)view
{
NSLog(@"'Adding KT Rotation recognizer to the rotation");
KTOneFingerRotationGestureRecognizer *rotation = [[KTOneFingerRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotating:)];
[view addGestureRecognizer:rotation];
 }


- (void)rotating:(KTOneFingerRotationGestureRecognizer *)recognizer
{
UIView *view = [recognizer view];
[view setTransform:CGAffineTransformRotate([view transform], [recognizer rotation])];
}


- (void)removeRotationGestureFromView: (UIImageView *) imgView {
//UIRotationGestureRecognizer *rotate = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationRemoved:)];
//[imgView removeGestureRecognizer:rotate];
KTOneFingerRotationGestureRecognizer *rotation = [[KTOneFingerRotationGestureRecognizer alloc] init];


while(self.mainImageView.gestureRecognizers.count){
    [self.mainImageView removeGestureRecognizer:[self.mainImageView.gestureRecognizers objectAtIndex:0]];
    //[self.mainImageView removeGestureRecognizer:rotation];
}
NSLog(@"Trying to remove rotation on this gesture");
}

我在自定义图块标签中调用它

 if(rotationToggle%2==0){
            [self enableRotation];
            NSLog(@"%d", rotationToggle);
        }
        else{
            [self removeRotationGestureFromView:self.mainImageView];
                            NSLog(@"%d", rotationToggle);
        }
        rotationToggle +=1;

其中rotationToggle是一个静态int。

如何删除一个手势识别器。当前方法删除图像视图中的所有识别器。如果我这样做的话 [imgView removeGestureRecognizer：rotate]; 要么 [self.mainImgView removeGestureRecognizer：rotate];

它不起作用。提前致谢。如果我忘了在这里提一下，请告诉我。

Answer 1

您正在创建新手势的实例并尝试删除该手势而不是删除之前添加的手势。保留前一个参考并删除它。

例如： -

@property (nonatomic, strong) KTOneFingerRotationGestureRecognizer *rotation;

- (void)addRotationGestureToView:(UIView *)view
{
   self.rotation = [[KTOneFingerRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotating:)];
   [view addGestureRecognizer:rotation];
}

- (void)removeRotationGestureFromView:(UIImageView *)imgView {
    [self.mainImageView removeGestureRecognizer:self.rotation];
}

选择性删除自定义手势识别器

1 个答案: