问题描述
我的应用程序创建了一个 UITableViewController,其中包含一个可以具有任意高度的自定义 tableHeaderView.我一直在努力寻找一种动态设置此标题的方法,因为似乎建议的方法已缩短此标题.我的 UITableViewController 的相关代码:
My application creates a UITableViewController that contains a custom tableHeaderView which may have an arbitrary height. I've been struggling with a way to set this header dynamically, as it seems the suggested ways have been cutting this header short. My UITableViewController's relevant code:
import UIKit
import SafariServices
class RedditPostViewController: UITableViewController, NetworkCommunication, SubViewLaunchLinkManager {
//MARK: UITableViewDataSource
var post: PostData?
var tree: CommentTree?
weak var session: Session! = Session.sharedInstance
override func viewDidLoad() {
super.viewDidLoad()
// Get post info from api
guard let postData = post else { return }
//Configure comment table
self.tableView.registerClass(RedditPostCommentTableViewCell.self, forCellReuseIdentifier: "CommentCell")
let tableHeader = PostView(withPost: postData, inViewController: self)
let size = tableHeader.systemLayoutSizeFittingSize(UILayoutFittingExpandedSize)
let height = size.height
let width = size.width
tableHeader.frame = CGRectMake(0, 0, width, height)
self.tableView.tableHeaderView = tableHeader
session.getRedditPost(postData) { (post) in
self.post = post?.post
self.tree = post?.comments
self.tableView.reloadData()
}
}
}
这会导致以下不正确的布局:
This results in the following incorrect layout:
如果我将行:tableHeader.frame = CGRectMake(0, 0, width, height)
改为 tableHeader.frame = CGRectMake(0, 0, width, 1000)代码> tableHeaderView 将正确布局:
If I change the line: tableHeader.frame = CGRectMake(0, 0, width, height)
to tableHeader.frame = CGRectMake(0, 0, width, 1000)
the tableHeaderView will lay itself out correctly:
我不确定我在这里做错了什么.此外,自定义 UIView 类,如果这有帮助:
I'm not sure what I'm doing incorrectly here. Also, custom UIView class, if this helps:
import UIKit
import Foundation
protocol SubViewLaunchLinkManager: class {
func launchLink(sender: UIButton)
}
class PostView: UIView {
var body: UILabel?
var post: PostData?
var domain: UILabel?
var author: UILabel?
var selfText: UILabel?
var numComments: UILabel?
required init?(coder aDecoder: NSCoder) {
fatalError("Not implemented yet")
}
init(withPost post: PostData, inViewController viewController: SubViewLaunchLinkManager) {
super.init(frame: CGRectZero)
self.post = post
self.backgroundColor = UIColor.lightGrayColor()
let launchLink = UIButton()
launchLink.setImage(UIImage(named: "circle-user-7"), forState: .Normal)
launchLink.addTarget(viewController, action: "launchLink:", forControlEvents: .TouchUpInside)
self.addSubview(launchLink)
selfText = UILabel()
selfText?.backgroundColor = UIColor.whiteColor()
selfText?.numberOfLines = 0
selfText?.lineBreakMode = .ByWordWrapping
selfText!.text = post.selfText
self.addSubview(selfText!)
selfText?.sizeToFit()
//let attributedString = NSAttributedString(string: "Test"/*post.selfTextHtml*/, attributes: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType])
//selfText.attributedText = attributedString
body = UILabel()
body!.text = post.title
body!.numberOfLines = 0
body!.lineBreakMode = .ByWordWrapping
body!.textAlignment = .Justified
self.addSubview(body!)
domain = UILabel()
domain!.text = post.domain
self.addSubview(domain!)
author = UILabel()
author!.text = post.author
self.addSubview(author!)
numComments = UILabel()
numComments!.text = "(post.numComments)"
self.addSubview(numComments!)
body!.translatesAutoresizingMaskIntoConstraints = false
domain!.translatesAutoresizingMaskIntoConstraints = false
author!.translatesAutoresizingMaskIntoConstraints = false
selfText!.translatesAutoresizingMaskIntoConstraints = false
launchLink.translatesAutoresizingMaskIntoConstraints = false
numComments!.translatesAutoresizingMaskIntoConstraints = false
let views: [String: UIView] = ["body": body!, "domain": domain!, "author": author!, "numComments": numComments!, "launchLink": launchLink, "selfText": selfText!]
//let selfTextSize = selfText?.sizeThatFits((selfText?.frame.size)!)
//print(selfTextSize)
//let metrics = ["selfTextHeight": selfTextSize!.height]
self.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-[body]-[selfText]-[domain]-|", options: [], metrics: nil, views: views))
self.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-[body]-[selfText]-[author]-|", options: [], metrics: nil, views: views))
self.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-[body]-[selfText]-[numComments]-|", options: [], metrics: nil, views: views))
self.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-[launchLink]-[numComments]-|", options: [], metrics: nil, views: views))
self.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|[body][launchLink]|", options: [], metrics: nil, views: views))
self.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|[selfText][launchLink]|", options: [], metrics: nil, views: views))
self.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|[domain][author][numComments][launchLink]|", options: [], metrics: nil, views: views))
}
override func layoutSubviews() {
super.layoutSubviews()
body?.preferredMaxLayoutWidth = body!.bounds.width
}
}
推荐答案
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override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
if let headerView = tableView.tableHeaderView {
let height = headerView.systemLayoutSizeFitting(UIView.layoutFittingCompressedSize).height
var headerFrame = headerView.frame
//Comparison necessary to avoid infinite loop
if height != headerFrame.size.height {
headerFrame.size.height = height
headerView.frame = headerFrame
tableView.tableHeaderView = headerView
}
}
}
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