在UIView中捕获UIDeviceOrientationDidChangeNotification时UIInterfaceOrientation尚未更新

我正在开发一个开源库来提供类似iMessage的文本输入视图 - MessageComposerView（与问题相关） . 视图将像_2580750一样粘在键盘上，并随着文本一起增长，但键盘不会消失 .

旋转这个自定义UIView时，我最近遇到了一个令人抓狂的问题，只有在视图通过 initWithFrame 实例化后才出现 . 基本上，如果视图已通过 initWithFrame 实例化，则捕获到UIDeviceOrientationDidChangeNotification通知时，UIInterfaceOrientation和框架尚未更新 . 以下是实例化的两种方式 .

loadNibNamed ：

self.messageComposerView = [[NSBundle mainBundle] loadNibNamed:@"MessageComposerView" owner:nil options:nil][0];
self.messageComposerView.frame = CGRectMake(0,
                                            self.view.frame.size.height - self.messageComposerView.frame.size.height,
                                            self.messageComposerView.frame.size.width,
                                            self.messageComposerView.frame.size.height);

initWithFrame ：

self.messageComposerView = [[MessageComposerView alloc] initWithFrame:CGRectMake(0, self.view.frame.size.height-54, 320, 54)];

当通过 loadNibNamed 初始化并旋转到横向时，收到 UIDeviceOrientationDidChangeNotification 通知后：

• UIDeviceOrientation = [[通知对象]方向] = UIInterfaceOrientationLandscapeLeft

• UIInterfaceOrientation = [UIApplication sharedApplication] .statusBarOrientation = UIDeviceOrientationLandscapeRight

• self.frame.size =（宽度= 480，身高= 90）

这里要注意的重要一点是界面和设备方向都是横向的，宽度已经改为横向宽度（在iPhone 6.1模拟器上测试） . 现在执行相同的测试，但使用 initWithFrame ：

• UIDeviceOrientation = [[通知对象]方向] = UIDeviceOrientationLandscapeRight

• UIInterfaceOrientation = [UIApplication sharedApplication] .statusBarOrientation = UIInterfaceOrientationPortrait

• self.frame.size =（宽度= 320，身高= 54）

这次注意到界面方向仍然是纵向，并且框架宽度未更改为横向宽度 . 如果我在 setFrame:(CGRect)frame 方法中设置断点，我可以看到在捕获并处理了UIDeviceOrientationDidChangeNotification之后，帧被设置为Landscape帧 .

两种init方法都具有几乎相同的设置：

- (id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
        self.frame = frame;
        self.sendButton = [[UIButton alloc] initWithFrame:CGRectZero];
        self.messageTextView = [[UITextView alloc] initWithFrame:CGRectZero];
        [self setup];
        [self addSubview:self.sendButton];
        [self addSubview:self.messageTextView];

    }
    return self;
}

- (void)awakeFromNib {
    [super awakeFromNib];
    [self setup];
}

用 setup 做必要的视图调整：

- (void)setup {
    self.backgroundColor = [UIColor lightGrayColor];
    self.autoresizesSubviews = YES;
    self.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleWidth;
    self.userInteractionEnabled = YES;
    self.multipleTouchEnabled = NO;

    CGRect sendButtonFrame = self.bounds;
    sendButtonFrame.size.width = 50;
    sendButtonFrame.size.height = 34;
    sendButtonFrame.origin.x = self.frame.size.width - kComposerBackgroundRightPadding - sendButtonFrame.size.width;
    sendButtonFrame.origin.y = kComposerBackgroundRightPadding;
    self.sendButton.frame = sendButtonFrame;
    self.sendButton.autoresizingMask = UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleLeftMargin;
    self.sendButton.layer.cornerRadius = 5;
    [self.sendButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    [self.sendButton setTitleColor:[UIColor colorWithRed:210/255.0 green:210/255.0 blue:210/255.0 alpha:1.0] forState:UIControlStateHighlighted];
    [self.sendButton setTitleColor:[UIColor grayColor] forState:UIControlStateSelected];
    [self.sendButton setBackgroundColor:[UIColor orangeColor]];
    [self.sendButton setTitle:@"Send" forState:UIControlStateNormal];
    self.sendButton.titleLabel.font = [UIFont boldSystemFontOfSize:14];


    CGRect messageTextViewFrame = self.bounds;
    messageTextViewFrame.origin.x = kComposerBackgroundLeftPadding;
    messageTextViewFrame.origin.y = kComposerBackgroundTopPadding;
    messageTextViewFrame.size.width = self.frame.size.width - kComposerBackgroundLeftPadding - kComposerTextViewButtonBetweenPadding - sendButtonFrame.size.width - kComposerBackgroundRightPadding;
    messageTextViewFrame.size.height = 34;
    self.messageTextView.frame = messageTextViewFrame;
    self.messageTextView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleBottomMargin;
    self.messageTextView.showsHorizontalScrollIndicator = NO;
    self.messageTextView.layer.cornerRadius = 5;
    self.messageTextView.font = [UIFont systemFontOfSize:14];
    self.messageTextView.delegate = self;

    [self addNotifications];
    [self resizeTextViewForText:@"" animated:NO];
}

所以我的问题是，为什么我的自定义UIView init通过 initWithFrame 仍然具有纵向框架和界面方向以及收到UIDeviceOrientationDidChangeNotification的时间 . 我使用此通知进行框架调整，并且需要将宽度更新为横向宽度 .

我在编程设置中丢失了'm hoping there is some kind of autorotation property that I'm，它隐藏在XIB中的某个地方，但是在没有找到解决方案的情况下，可能已经完成了十几个 UIDeviceOrientationDidChangeNotification stackoverflow帖子 .