为什么我得到一个“执行 -layoutSubviews 后仍然需要自动布局"?每次我的应用程序现在启动时都会出错?

问题描述

由于我添加了以下代码，每次我的应用打开此 UITableViewController 时它都会崩溃:

Since I added the following code, every time my app opens this UITableViewController it crashes:

 self.noArticlesView = [[UIView alloc] init];
 self.noArticlesView.translatesAutoresizingMaskIntoConstraints = NO;
 self.noArticlesView.backgroundColor = [UIColor colorWithRed:0.961 green:0.961 blue:0.961 alpha:1];

 [self.view addSubview:self.noArticlesView];

 [self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.noArticlesView attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeTop multiplier:1.0 constant:0.0]];
 [self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.noArticlesView attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeBottom multiplier:1.0 constant:0.0]];
 [self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.noArticlesView attribute:NSLayoutAttributeLeading relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeLeft multiplier:1.0 constant:0.0]];
 [self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.noArticlesView attribute:NSLayoutAttributeTrailing relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeRight multiplier:1.0 constant:0.0]];

它给了我这个错误:

* 由于未捕获的异常NSInternalInconsistencyException"而终止应用程序，原因:执行 -layoutSubviews 后仍需要自动布局.UITableView的-layoutSubviews的实现需要调用super.'

我到底做错了什么?当有 0 行时，我在 tableView:numberOfRowsInSection: 中调用该代码.

What on earth am I doing wrong? I call that code in tableView:numberOfRowsInSection: when there's 0 rows.

推荐答案

我正在继承 UIScrollView 并在 iOS 7(但不是 8)上收到相同的错误消息.

I was subclassing UIScrollView and received the same error message on iOS 7 (but not 8).

我以类似于以下方式覆盖 layoutSubviews:

I was overriding layoutSubviews in a manner similar to the following:

- (void)layoutSubviews {
    [super layoutSubviews];
    // code to scroll the view
}

我解决了这个问题，把对 super 的 layoutSubviews 的调用移到方法中的最后一件事:

I resolved the issue by moving the call to super's layoutSubviews to be the last thing in the method:

- (void)layoutSubviews {
    // code to scroll the view
    [super layoutSubviews];
}

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