UIImageView无法响应某些边缘的手势

Question

我正在制作一个由UIImageView和Label组成的自定义控件。控件的行为类似于复选框。

以下是代码：

-(instancetype) initWithTitle:(NSString *)title normalCheckBoxImage:(NSString *)normalCheckBoxImage selectedCheckBoxImage:(NSString *)selectedCheckBoxImage
{
    self = [super init];

    self.userInteractionEnabled = YES;

    self.normalCheckBoxImageName = normalCheckBoxImage;
    self.selectedCheckBoxImageName = selectedCheckBoxImage;
    self.title = title;

    [self setupSubViews];

    [self registerGestureRecognizers];

    return self;
}

-(void) registerGestureRecognizers
{
    UITapGestureRecognizer *singleTapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(checkBoxTapped:)];
    singleTapGestureRecognizer.delegate = self;
    singleTapGestureRecognizer.numberOfTapsRequired = 1;

    [self.checkBoxImageView addGestureRecognizer:singleTapGestureRecognizer];
}

-(void) checkBoxTapped:(UITapGestureRecognizer *) recognizer
{
    self.isChecked = !self.isChecked;

    if(self.isChecked)
    {
        [self.checkBoxImageView setImage:[UIImage imageNamed:self.selectedCheckBoxImageName]];
    }

    else
    {
        [self.checkBoxImageView setImage:[UIImage imageNamed:self.normalCheckBoxImageName]];
    }

}

-(void) setupSubViews
{
    self.checkBoxImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:self.normalCheckBoxImageName]];

    self.checkBoxImageView.frame = CGRectMake(0, 0, 50, 50);

    NSLog(@"width = %f; height = %f",self.checkBoxImageView.frame.size.width,self.checkBoxImageView.frame.size.height);

    [self.checkBoxImageView setUserInteractionEnabled:YES];

    // The init with frame should be replaced by the NSConstraints
    self.titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(self.checkBoxImageView.frame.size.width + 5, 10, 100, 20)];

    self.titleLabel.text = self.title;

    [self addSubview:self.checkBoxImageView];
    [self addSubview:self.titleLabel];
}

我已将手势识别器附加到UIImageView。但由于某些原因，它只在我接近UIImageView的左边缘时触发。我不确定我做错了什么。如果我触摸uIImageView的中间，那么它什么都不做。

这是图片：

Answer 1

问题是超级视图的框架不正确。而不是宽度和高度50 X 50，它是50 X 20.

AZCheckBox *checkbox = [[AZCheckBox alloc] initWithTitle:@"I agree" normalCheckBoxImage:@"NormalCheckBoxImage" selectedCheckBoxImage:@"SelectedCheckBoxImage"];
    checkbox.frame = CGRectMake(100, 100, 200, 50);

    checkbox.delegate = self;

    [self.view addSubview:checkbox];