Question

我正在开发一个开源库，以提供类似iMessage的文本输入视图 - MessageComposerView（与问题相关）。该视图将像inputAccessoryView一样粘在键盘上并随文本一起增长，但在键盘出现时不会消失。

旋转此自定义UIView时，我最近遇到了令人抓狂的问题，只有在通过initWithFrame实例化视图时才会出现该问题。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)];

在通过loadNibNamed初始化并在收到UIDeviceOrientationDidChangeNotification通知后轮播到横向时：

UIDeviceOrientation = [[通知对象]方向] = UIInterfaceOrientationLandscapeLeft
UIInterfaceOrientation = [UIApplication sharedApplication] .statusBarOrientation = UIDeviceOrientationLandscapeRight
self.frame.size =（width = 480，height = 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 =（width = 320，height = 54）

此时请注意界面方向仍为纵向，并且框架宽度未更改为横向宽度。如果我在setFrame:(CGRect)frame方法中设置了一个断点，我可以看到在捕获并处理了UIDeviceOrientationDidChangeNotification后，框架被设置为Landscape框架。

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];
}

setup进行必要的视图调整：

- (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 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。

我希望在编程设置中我缺少某种自动旋转属性，这种属性隐藏在XIB的某个地方，但却无法找到它。我已经查看了十几个UIDeviceOrientationDidChangeNotification stackoverflow帖子而没有找到解决方案。

Answer 1

MessageComposerView看起来很整洁，感谢分享。

您应该实施UIDeviceOrientationDidChangeNotification，而不是收听layoutSubviews。响应旋转调用它以及系统需要UIView重新定位其子视图（https://stackoverflow.com/a/5330162/1181421）的任何其他内容。在那里，您可以相对于UIView的框架定位子视图，并确保框架正确。

在UIView中捕获UIDeviceOrientationDidChangeNotification时UIInterfaceOrientation尚未更新

1 个答案: