ios - Autoresizingmask 无法正常工作

Question

我以编程方式在屏幕上放置了一个带有框架(0、100、50、50)的 UIView，并将其 autoresizingMask 设置为 UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin 并且当我开始旋转屏幕时，由于某种原因， View 会停留在右边缘。如果我设置 View 框架(20、100、50、50)一切正常。

我究竟做错了什么？

示例代码:

- (void)viewDidLoad
{
    [super viewDidLoad];
    UIView *cell = [[UIView alloc] initWithFrame:CGRectMake(0, 100, 50, 50)];
    cell.backgroundColor = [UIColor blackColor];
    cell.autoresizingMask = UIViewAutoresizingFlexibleRightMargin | 
                            UIViewAutoresizingFlexibleLeftMargin;
    [self.view addSubview:cell];
}
- (NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskAll;
}

旋转前:

 --------------------------- 
|                           |
|=====                      |
||   |                      |
|=====                      |
|                           |
|                           |
|                           |
|                           |
|                           |
|                           |
|                           |
|                           |
|                           |
|                           |
|                           |
-----------------------------
|             o             |
 --------------------------- 

旋转后一切都不好:

 ------------------------------------------------
|                                            |   |
|                                       =====|   |
|                                       |   ||   |
|                                       =====|   |
|                                            |   |
|                                            | o |
|                                            |   |
|                                            |   |
|                                            |   |
|                                            |   |
|                                            |   |
 ------------------------------------------------

 --------------------------- 
|                           |
|                      =====|
|                      |   ||
|                      =====|
|                           |
|                           |
|                           |
|                           |
|                           |
|                           |
|                           |
|                           |
|                           |
|                           |
-----------------------------
|             o             |
 --------------------------- 

如果我改变

UIView *cell = [[UIView alloc] initWithFrame:CGRectMake(0, 100, 50, 50)];

到

UIView *cell = [[UIView alloc] initWithFrame:CGRectMake(20, 100, 50, 50)];

旋转前:

 --------------------------- 
|                           |
|   =====                   |
|   |   |                   |
|   =====                   |
|                           |
|                           |
|                           |
|                           |
|                           |
|                           |
|                           |
|                           |
|                           |
-----------------------------
|             o             |
 --------------------------- 

旋转后一切正常:

 -------------------------------------------------
|                                             |   |
|   =====                                     |   |
|   |   |                                     |   |
|   =====                                     |   |
|                                             |   |
|                                             | o |
|                                             |   |
|                                             |   |
|                                             |   |
|                                             |   |
|                                             |   |
 -------------------------------------------------

 --------------------------- 
|                           |
|   =====                   |
|   |   |                   |
|   =====                   |
|                           |
|                           |
|                           |
|                           |
|                           |
|                           |
|                           |
|                           |
|                           |
-----------------------------
|             o             |
 --------------------------- 

Answer 1

试试这个:

cell.autoresizingMask = UIViewAutoresizingFlexibleRightMargin | 
                        UIViewAutoresizingFlexibleBottomMargin;