Question

为什么视图框架会自动更改？

请参阅此代码：

- (void)loadView{
    UIScrollView *sv = [[UIScrollView alloc] initWithFrame:CGRectMake(-10,0,340,480)];
    self.view = sv;
    NSLog(@"sv frame = %@", NSStringFromCGRect(self.view))
}

- (void)viewWillAppear{
  NSLog(@"view frame = %@", NSStringFromCGRect(self.view));
}

在我的演示中输出： sv frame = {{-10,0}，{340,480}}

view frame = {{0,0}，{320,480}}

应该是：view frame = {{-10,0}，{340,480}}

但是在PhotoScroller演示（2010 WWDC 104）中，它是正确的。这太奇怪了。

Answer 1

以这种方式更改两种方法：

- (void)loadView{
   UIScrollView *sv = [[UIScrollView alloc] initWithFrame:CGRectZero];
   self.view = sv;
}

- (void)viewWillAppear:(BOOL)animated {
   self.view.frame = CGRectMake(-10,0,340,480);
}

编辑：几何必须至少在viewWillAppear:以及UIViewController的事件生命周期中设置。自动调整蒙版也可以更改几何体。

Answer 2

- (void)loadView
{    
    UISCrollView *scrollView = [[UIScrollView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];
    self.view = scrollView;
}

Answer 3

试试这个：

- (void)loadView{
    UIView *view=[[UIView alloc] initWithFrame:CGRectMake(0,0,320,480)];
    UIScrollView *sv = [[UIScrollView alloc] initWithFrame:CGRectMake(-10,0,340,480)];
    [view addSubview:sv];
    sv.autoresizingMak=UIViewAutoresizingMaskFlexibleWidth|UIViewAutoresizingMaskFlexibleHeight;
    self.view = view;
}

在加载视图中创建视图并设置其框架，但框架自动更改

3 个答案: