[英]How do I adjust my popover to the size of the content in my tableview in swift?
I'm using popoverPresentationController
to show my popover.我正在使用popoverPresentationController
来显示我的弹出popoverPresentationController
。 The UITableViewController
used to show as popover is created programmatically and will usually contain 1 to 5 rows.用于显示为 popover 的UITableViewController
是以编程方式创建的,通常包含 1 到 5 行。 How do I set up this popover to adjust the size to the content of the tableview?如何设置此弹出窗口以根据 tableview 的内容调整大小?
Code for my popover:我的弹窗代码:
if recognizer.state == .Began {
let translation = recognizer.locationInView(view)
// Create popoverViewController
var popoverViewController = UITableViewController()
popoverViewController.modalPresentationStyle = UIModalPresentationStyle.Popover
popoverViewController.tableView.backgroundColor = UIColor.popupColor()
// Settings for the popover
let popover = popoverViewController.popoverPresentationController!
popover.delegate = self
popover.sourceView = self.view
popover.sourceRect = CGRect(x: translation.x, y: translation.y, width: 0, height: 0)
popover.backgroundColor = UIColor.popupColor()
presentViewController(popoverViewController, animated: true, completion: nil)
}
In your UITableViewController's viewDidLoad()
you can add an observer:在您的 UITableViewController 的viewDidLoad()
您可以添加一个观察者:
self.tableView.addObserver(self, forKeyPath: "contentSize", options: .new, context: nil)
Then add this method:然后添加这个方法:
override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
self.preferredContentSize = tableView.contentSize
}
Lastly, in viewDidDisappear()
, make sure you remove the observer:最后,在viewDidDisappear()
,确保移除观察者:
tableView.removeObserver(self, forKeyPath: "contentSize")
This way the popover will automatically adjust size to fit the content, whenever it is loaded, or changed.这样,无论何时加载或更改,popover 都会自动调整大小以适合内容。
Checkout the preferredContentSize property of UIViewController :检查UIViewController的preferredContentSize 属性:
let height = yourDataArray.count * Int(popOverViewController.tableView.rowHeight)
popOverViewController.preferredContentSize = CGSize(width: 300, height: height)
Override the preferredContentSize
property in your extension of the uitableviewcontroller
as following:覆盖uitableviewcontroller
扩展中的preferredContentSize
属性,如下所示:
override var preferredContentSize: CGSize {
get {
let height = calculate the height here....
return CGSize(width: super.preferredContentSize.width, height: height)
}
set { super.preferredContentSize = newValue }
}
For calculating the height check out tableView.rectForSection(<#section: Int#>)
用于计算高度检查tableView.rectForSection(<#section: Int#>)
Simple dynamic answer for Swift 4.x and Swift 5.x involving no size-computation (modern version of Bo Frese answer): Swift 4.x和Swift 5.x 的简单动态答案,不涉及大小计算(Bo Frese 答案的现代版本):
private var contentSizeObserver : NSKeyValueObservation?
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
contentSizeObserver = tableView.observe(\.contentSize) { [weak self] tableView, _ in
self?.preferredContentSize = CGSize(width: 320, height: tableView.contentSize.height) // Here I fixed the width but you can do whatever you want
}
}
override func viewDidDisappear(_ animated: Bool) {
super.viewDidDisappear(animated)
contentSizeObserver?.invalidate()
contentSizeObserver = nil
}
For swift 4 if you want to observe the content size I found this to be the optimal solution.对于 swift 4,如果您想观察内容大小,我发现这是最佳解决方案。 Reporting it here since I did not find a complete example online:在这里报告,因为我没有在网上找到完整的例子:
class MyTableViewController: UITableViewController {
private var kvoContext = 0
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
addObserver(self, forKeyPath: #keyPath(tableView.contentSize), options: .new, context: &kvoContext)
}
override func viewDidDisappear(_ animated: Bool) {
removeObserver(self, forKeyPath: #keyPath(tableView.contentSize))
super.viewDidDisappear(animated)
}
override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
if context == &kvoContext, keyPath == #keyPath(tableView.contentSize),
let contentSize = change?[NSKeyValueChangeKey.newKey] as? CGSize {
self.popoverPresentationController?.presentedViewController.preferredContentSize = contentSize
}
}
}
First thing first: All comments are good and help full.首先第一件事:所有评论都很好,并且很有帮助。 I have did little change in my logic which makes my VC as reusable component.我的逻辑几乎没有改变,这使我的 VC 成为可重用的组件。
Calling this method inside viewWillAppear:(BOOL)animated
:在viewWillAppear:(BOOL)animated
调用此方法:
-(void) setPopOverPreferedContentHeight {
if (self.popoverPresentationController && self.tableView.contentSize.height < MAX_POPOVER_HEIGHT) {
self.preferredContentSize=self.tableView.contentSize;
} else if (self.popoverPresentationController){
self.preferredContentSize = CGSizeMake(self.tableView.contentSize.width, MAX_POPOVER_HEIGHT);
}
}
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