ios - 当 UIDeviceOrientationDidChangeNotification 在 UIView 中捕获时，UIInterfaceOrientation 尚未更新

Question

我正在开发一个开源库来提供类似 iMessage 的文本输入 View - MessageComposerView (与问题有关)。 View 将像 inputAccessoryView 一样粘在键盘上并随着文本增长，但不会在键盘消失时消失。

我最近在旋转此自定义 UIView 时遇到了一个令人抓狂的问题，该自定义 UIView 仅在 View 已通过 initWithFrame 实例化时出现.如果 View 已通过 initWithFrame 实例化，则基本上是在捕获 UIDeviceOrientationDidChangeNotification 通知时。 ，UIInterfaceOrientation 和框架尚未更新。这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)];

通过 loadNibNamed 初始化时并旋转到横向，收到 UIDeviceOrientationDidChangeNotification通知:

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

UIInterfaceOrientation = [UIApplication sharedApplication].statusBarOrientation = UIDeviceOrientationLandscapeRight

self.frame.size =(宽度=480，高度=90)

这里需要注意的重要一点是界面和设备方向都是横向的，并且宽度已经更改为横向宽度(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，高度=54)

这次请注意界面方向仍然是纵向的，并且框架宽度没有更改为横向宽度。如果我在 setFrame:(CGRect)frame 中设置断点方法我可以看到，在 UIDeviceOrientationDidChangeNotification 被捕获和处理之后，框架被设置为景观框架。

两种 init 方法的设置几乎相同:

- (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];
}

与 setup进行必要的 View 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 通过 initWithFrame 初始化仍然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，并且需要已将宽度更新为横向宽度。

我希望在程序设置中缺少某种自动旋转属性，该属性隐藏在 XIB 的某个地方，但就是找不到。我已经经历了大概十几个 UIDeviceOrientationDidChangeNotification stackoverflow 没有找到解决方案的帖子。

Answer 1

MessageComposerView 看起来很整洁，谢谢分享。

而不是听UIDeviceOrientationDidChangeNotification , 你应该执行 layoutSubviews .它被调用以响应旋转和系统需要的任何其他 UIView重新定位其 subview (https://stackoverflow.com/a/5330162/1181421)。在那里，您可以相对于 UIView 定位您的 subview 。的框架，您可以确定该框架是正确的。