ios - UIView 程序化宽度约束

Question

我需要添加什么样的约束以确保手机何时旋转搜索栏并且标签跨越手机的宽度？

下面是我用来启动搜索栏和标签并将它们添加到表头的代码：

self.venueSearchController = [[UISearchController alloc] initWithSearchResultsController:nil];
self.venueSearchController.searchResultsUpdater = self;
self.venueSearchController.searchBar.delegate = self;
self.venueSearchController.delegate = self;
self.venueSearchController.dimsBackgroundDuringPresentation = NO;
self.venueSearchController.hidesNavigationBarDuringPresentation = YES;
self.venueSearchController.searchBar.frame = CGRectMake(0, 0, self.venueSearchController.view.frame.size.width, 44.0);

// create a UISegmentControl
UILabel *tableHeaderLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 30, self.venueSearchController.view.frame.size.width, 30)];
[tableHeaderLabel setTextAlignment:NSTextAlignmentCenter];
tableHeaderLabel.font = [UIFont fontWithName:@"HelveticaNeue" size:18];
tableHeaderLabel.text = @"Text Here";
tableHeaderLabel.backgroundColor = [UIColor redColor];

// create a custom UIView

CGRect applicationFrame = [[UIScreen mainScreen] applicationFrame];
UIView *myView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, applicationFrame.size.width, 74)];

[myView addSubview:tableHeaderLabel]; // add header label
[myView addSubview:self.venueSearchController.searchBar]; // add search bar to custom view

self.tableView.tableHeaderView = myView;

Answer 1

仅供参考我通过简单地使用来解决这个问题autoresizingMask

tableHeaderLabel.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin;

self.venueSearchController.searchBar.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin;