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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）。视图会像 an 一样粘在键盘上inputAccessoryView并随着文本增长，但不会在键盘消失时消失。

我最近在旋转这个自定义 UIView 时遇到了一个令人抓狂的问题，该 UIView 仅在视图通过initWithFrame. 基本上，如果视图已通过实例化，则在捕获 UIDeviceOrientationDidChangeNotification 通知时initWithFrame， 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)];

当通过初始化loadNibNamed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，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。如果我在方法中设置断点，setFrame:(CGRect)frame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];
}

通过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 viainitWithFrame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 中的某个地方，但找不到它。我可能已经浏览了十几个UIDeviceOrientationDidChangeNotificationstackoverflow 帖子，但没有找到解决方案。

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1 回答 1

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MessageComposerView 看起来很整洁，谢谢分享。

而不是听的UIDeviceOrientationDidChangeNotification，你应该实施layoutSubviews。它被调用以响应旋转和系统需要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，您可以相对于框架定位您的子视图UIView，并且您可以确定框架是正确的。

于 2013-11-17T02:27:15.477 回答