UIView 处理手势，内部 UIButton 应该捕捉触摸

Question

我有一个包含 UIButton 的 UIView。
UIView 使用以下方法捕获触摸事件：

[self.view addGestureRecognizer:[[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(open:)] autorelease]];

在某些情况下，当视图被触摸时我不想做任何事情：

- (void) open:(UITapGestureRecognizer *)recognizer
{
    if (self.someCondition == YES) return;
    // Do very interesting stuff
}

UIButton 链接到这样的方法：

[self.deleteButton addTarget:self action:@selector(deleteTheWorld:) forControlEvents:UIControlEventTouchUpInside];

问题是当 someCondition = YES 时，UIButton 不响应触摸事件。我怎样才能让它响应？

注意：我只在 someCondition == YES 时显示 UIButton。

Answer 1

首先尝试使用tapRecognizer.cancelsTouchesInView = NO;，如果这不起作用，我建议使用UIGestureRecognizerDelegate 方法来防止在您的视图中发生触摸，例如：

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
        if ([touch.view isKindOfClass:[UIButton class]]) {
              return YES; // button is touched then, yes accept the touch
        }
        else if (self.someContiditon == YES) {
            return NO; // we don't want to receive touch on the view because of the condition
        }
        else { 
          return YES; // tap detected on view but no condition is required
        }
  }

Answer 2

我认为您最好的选择是管理在您的 open 选择器中单击的按钮。

放一些类似的东西

CGPoint location = [recognizer locationInView:self.view];
if(self.someCondition == YES) 
    if(recognizer.state == UIGestureRecognizerStateRecognized &&
       CGRectContainsPoint(self.deleteButton.frame, location))
         [self deleteTheWorld];
    else
         return;

而不是

- (void) open:(UITapGestureRecognizer *)recognizer
{
    if (self.someCondition == YES) return;
    // Do very interesting stuff
}

当然你不需要为按钮注册目标动作！