在我的聊天应用程序中,我使用
JSQMessagesViewController渲染对话.该应用程序还有我想要搜索的公共消息.我现在试图使用JSQMessagesViewController显示它们.为此,我想隐藏inputToolbar(可以)并添加一个搜索栏.
如何使搜索栏可见？当你看到属性topContentAdditionalInset看起来应该是可能的.这是我的代码与我的尝试：
override func viewDidLoad() {
super.viewDidLoad()
self.inputToolbar.removeFromSuperview()
self.searchBar.removeFromSuperview()
self.topContentAdditionalInset = 44
self.searchBar.frame = CGRect(x: 0,y: 25,width: 320,height: 44)
// Attempt 1
// self.collectionView.addSubview(self.searchBar)
// Attempt 2
// self.view.addSubview(self.searchBar)
// Attempt 3
// self.navigationController?.navigationBar.addSubview(self.searchBar)
// Attempt 4
// self.inputToolbar.addSubview(self.searchBar)
// Attempt 5
self.collectionView.superview!.addSubview(self.searchBar)
}
更新：
以下代码似乎工作正常.它的问题是：
– 它是collectionView的一个孩子,因此将滚动显示内容.将它添加到.superview不起作用.
– 当搜索栏获得焦点时,它会向下滚动44像素.
var keepRef:JSQMessagesInputToolbar!
var searchBar:UISearchBar!
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
if self.inputToolbar.superview != nil {
keepRef = self.inputToolbar
self.inputToolbar.removeFromSuperview()
}
self.topContentAdditionalInset = 44
if searchBar == nil {
searchBar = UISearchBar(frame: CGRect(x: 0,y: -44,height: 44))
searchBar.delegate = self
self.collectionView.scrollsToTop = true
self.collectionView.addSubview(searchBar)
}
self.filterContentForSearchText("")
}
更新2：
基于Sergey的答案(其工作原理),我现在使用以下代码：
var keepRef:JSQMessagesInputToolbar!
var searchBar:UISearchBar!
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
self.inputToolbar.hidden = true
self.topContentAdditionalInset = 44
self.collectionView.scrollsToTop = true
if searchBar == nil {
searchBar = UISearchBar()
searchBar.setTranslatesAutoresizingMaskIntoConstraints(false)
searchBar.delegate = self
self.view.addSubview(searchBar)
let views = ["searchBar" : self.searchBar];
searchBar.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("[searchBar(44)]",options: NSLayoutFormatOptions(0),metrics: nil,views: views))
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("|[searchBar]|",views: views))
self.view.addConstraint(NSLayoutConstraint(item: searchBar,attribute: .Top,relatedBy: .Equal,toItem: self.topLayoutGuide,attribute: .Bottom,multiplier: 1.0,constant: 0.0))
}
self.filterContentForSearchText("")
}
解决方法
首先：UIViweController的JSQMessagesViewController子类.这意味着您可以轻松添加子视图.您在Attempt 2中几乎完全正确,但设置不正确的框架.我建议你使用自动布局,如下面的代码：
迅速
var searchBar: UISearchBar!;
override func viewDidLoad() {
super.viewDidLoad()
searchBar = UISearchBar()
searchBar.setTranslatesAutoresizingMaskIntoConstraints(false)
self.view.addSubview(searchBar)
let views = ["searchBar" : self.searchBar];
searchBar.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("[searchBar(44)]",views: views))
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("|[searchBar]|",views: views))
self.view.addConstraint(NSLayoutConstraint(item: searchBar,constant: 0.0))
}
目标C
@property (nonatomic,strong) UISearchBar *searchBar;
...
// viewDidLoad
self.searchBar = [UISearchBar new];
self.searchBar.translatesAutoresizingMaskIntoConstraints = NO;
[self.view addSubview:self.searchBar];
NSDictionary *views = @{@"searchBar" : self.searchBar};
[self.searchBar addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"[searchBar(44)]"
options:0
metrics:nil
views:views]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"|[searchBar]|"
options:0
metrics:nil
views:views]];
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.searchBar
attribute:NSLayoutAttributeTop
relatedBy:NSLayoutRelationEqual
toItem:self.topLayoutGuide
attribute:NSLayoutAttributeBottom
multiplier:1.0
constant:0.0]];
