向我添加到 UIWindow 的视图添加约束时出错？

Posted 2023-02-27

【中文标题】向我添加到 UIWindow 的视图添加约束时出错？

【英文标题】：error when adding constraints to a view I added to UIWindow?

【发布时间】：2015-06-10 05:37:38

【问题描述】：

对不起，我的英语很差。 我的代码如下：两个视图将添加到窗口中

   UIWindow *window = [[[UIApplication sharedApplication] delegate] window];
    if (!_transparentView) 
        _transparentView  = [[UIView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_BOUNDS.size.width, SCREEN_BOUNDS.size.height)];
        [_transparentView setBackgroundColor:[UIColor blackColor]];
        [_transparentView setAlpha:0.5];
        [window addSubview:_transparentView];
    
    [_transparentView setHidden:NO];
     _noSupportairDropTipView = [[[NSBundle mainBundle] loadNibNamed:@"ConnectPhoneTipView" owner:self options:nil] lastObject];

 [window addConstraint:[NSLayoutConstraint constraintWithItem:_noSupportairDropTipView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:window attribute:NSLayoutAttributeCenterX multiplier:1 constant:0]];
[window addConstraint:[NSLayoutConstraint constraintWithItem:_noSupportairDropTipView attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:window attribute:NSLayoutAttributeCenterY multiplier:1 constant:0]];
 [_noSupportairDropTipView addConstraint:[NSLayoutConstraint constraintWithItem:_noSupportairDropTipView attribute:NSLayoutAttributeWidth relatedBy:0 toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:293]];
 [_noSupportairDropTipView addConstraint:[NSLayoutConstraint constraintWithItem:_noSupportairDropTipView attribute:NSLayoutAttributeHeight relatedBy:0 toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:277]];

 [window addSubview:_noSupportairDropTipView];

。我收到如下错误。我不知道为什么。

 <UIView: 0x190c3e10; frame = (0 0; 320 480); alpha = 0.5; layer =
<CALayer: 0x191b45f0>>  View not found in container hierarchy:
<ConnectPhoneTipView: 0x190d8920; frame = (0 0; 293 277); autoresize
= RM+BM; layer = <CALayer: 0x1917b5e0>>     That view's superview: NO SUPERVIEW libc++abi.dylib: terminate_handler unexpectedly threw an
exception

我是否必须向 _transparentView 添加一些约束？是这个原因吗？或其他原因

【问题讨论】：

ConnectPhoneTipView 在哪里？该错误与此有关，但我在您的代码 sn-p 中没有看到它。

_supportAirDropTipView = [[[NSBundle mainBundle] loadNibNamed:@"ConnectPhoneTipView" owner:self options:nil] lastObject];

您正在添加_noSupportairDropTipView，但没有使用_SupportairDropTipView（没有no）这是正确的吗？还有，_noSupportairDropTipView 是从哪里来的？

我很粗心。我更新了问题。请告诉我为什么会崩溃

【参考方案1】：

尝试在视图创建后立即将_noSupportairDropTipView 添加到窗口，然后添加约束：

 _noSupportairDropTipView = [[[NSBundle mainBundle] loadNibNamed:@"ConnectPhoneTipView" owner:self options:nil] lastObject];
[window addSubview:_noSupportairDropTipView];

[window addConstraint:[NSLayoutConstraint constraintWithItem:_noSupportairDropTipView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:window attribute:NSLayoutAttributeCenterX multiplier:1 constant:0]];
[window addConstraint:[NSLayoutConstraint constraintWithItem:_noSupportairDropTipView attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:window attribute:NSLayoutAttributeCenterY multiplier:1 constant:0]];
[_noSupportairDropTipView addConstraint:[NSLayoutConstraint constraintWithItem:_noSupportairDropTipView attribute:NSLayoutAttributeWidth relatedBy:0 toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:293]];
[_noSupportairDropTipView addConstraint:[NSLayoutConstraint constraintWithItem:_noSupportairDropTipView attribute:NSLayoutAttributeHeight relatedBy:0 toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:277]];

【讨论】：

太棒了！你是对的！现在它显示出来了。但是现在我想问你一个问题。如果uiview的子视图变大，如何让uiview变大。

我知道该怎么做了。非常感谢。