更改按钮框架时按钮操作不起作用

Question

我正在尝试根据方向更改来更改按钮框架，但按钮操作未检测到框架是否已更改。

从“ viewWillAppear ”方法调用“ addButtonsOnScrollView ”方法

这是我的代码

//scaleFactor = 320 if portrait orientation scaleFactor= 480 if landscape orientation

- (void) addButtonsOnScrollView 
{ 
   containerViewForButtons = [[UIView alloc]initWithFrame:CGRectMake(scaleFactor-100, 22, 100, 37)];
      addButton = [UIButton buttonWithType:UIButtonTypeCustom];
  [addButton addTarget:self action:@selector(addFriend:)forControlEvents:UIControlEventTouchDown];
  [addButton setBackgroundImage:[UIImage imageNamed:@"add_btn.png"] forState:UIControlStateNormal];
  addButton.frame = CGRectMake(0, 0, 37, 37);   
  [containerViewForButtons addSubview:addButton];
    [self.view addSubview:containerViewForButtons];
}

- (void) addFriend:(UIButton *) button {
   NSLog("Button clicked....");
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
 // Return YES for supported orientations
   if (interfaceOrientation == UIInterfaceOrientationLandscapeLeft || interfaceOrientation == UIInterfaceOrientationLandscapeRight) {

       [self layoutLandscapeView];
      }
      else if (interfaceOrientation == UIInterfaceOrientationPortrait) {

       [self layoutPortraitView];
      }
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
- (void) layoutLandscapeView {

     containerViewForButtons.frame = CGRectMake(380, 22, 100, 37);

}
- (void) layoutPortraitView {

    containerViewForButtons.frame = CGRectMake(220, 22, 100, 37);
}

Answer 1

您是否正在将按钮添加到滚动视图（从方法名称看起来像它）？ 旋转时，很有可能滚动视图的内容大小没有得到更新。 这就是为什么按钮无法检测到触摸的原因。

Answer 2

最初创建UIButtonTypeRoundRect而不是UIButtonTypeCustom 。 这样您就可以看到Button的可见性。 选中按钮可见且可触摸。

另一件事可能更改UIControlEventTouchDown到UIControlEventToucUpInSide这将有助于我猜。

Answer 3

尝试设置containerViewForButtons.clipsToBounds = YES; 只是要检查按钮是否仍在视图框架中并且未被切断。 如果clipsToBounds设置为NO，您仍然会看到该按钮，但是它不会拦截任何触摸，因为它超出了containerViewForButtons范围

Answer 4

尝试这个......

- (void) layoutLandscapeView 
{

   [containerViewForButtons removeFromSuperview];
   containerViewForButtons.frame = CGRectMake(380, 22, 100, 37);
   [self.view addSubview:containerViewForButtons];
}
- (void) layoutPortraitView 
{

   [containerViewForButtons removeFromSuperview];
   containerViewForButtons.frame = CGRectMake(220, 22, 100, 37);
   [self.view addSubview:containerViewForButtons];
}