我正试图让我的应用程序有一个类似于 reddit 的赞成票/反对票系统，这意味着当单击按钮以仅更改它们自己的数据时，我表中的每个单元格都必须做出不同的 react 。我创建了一个自定义单元格类并相应地设置了所有内容，但是由于某种原因，当我运行我的应用程序时，只要您点击单元格中的按钮，它就会崩溃。
这是我的代码(我试图编辑掉任何不必要的部分，但如果您想查看整个代码，请告诉我):
import UIKit
import Firebase
import FirebaseDatabase
class FindPartiesViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
// where we will store all the parties
var parties = [party]()
@IBOutlet weak var partyTable: UITableView!
var refreshControl = UIRefreshControl()
override func viewDidLoad() {
super.viewDidLoad()
partyTable.delegate = self
partyTable.dataSource = self
}
// creates the number of cells in the table
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return parties.count
// define all the cells
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
// Make table cells the show the party
let cell = partyTable.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! CustomCell
cell.nameLabel.text = parties[indexPath.row].name
cell.LocationLabel.text = parties[indexPath.row].location
cell.totalVotesLabel.text = (String(parties[indexPath.row].upVotes - parties[indexPath.row].downVotes))
cell.upVoteButton.tag = indexPath.row
cell.upVoteButton.addTarget(self, action: Selector(("upVoteAction")), for: .touchUpInside)
cell.downVoteButton.tag = indexPath.row
cell.downVoteButton.addTarget(self, action: Selector(("downVoteAction")), for: .touchUpInside)
return cell
}
@IBAction func upVoteAction(sender: UIButton){
print("+1")
parties[sender.tag].upVotes = parties[sender.tag].upVotes + 1
}
}
(更新) 我的错误信息:
2016-11-10 13:35:20.371 Lit[16625:2721786] -[Lit.FindPartiesViewController upVoteAction]: unrecognized selector sent to instance 0x7fc40b420240
2016-11-10 13:35:20.375 Lit[16625:2721786] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[Lit.FindPartiesViewController upVoteAction]: unrecognized selector sent to instance 0x7fc40b420240'
*** First throw call stack:
(
0 CoreFoundation 0x00000001093ef34b __exceptionPreprocess + 171
1 libobjc.A.dylib 0x0000000108e5021e objc_exception_throw + 48
2 CoreFoundation 0x000000010945ef34 -[NSObject(NSObject) doesNotRecognizeSelector:] + 132
3 CoreFoundation 0x0000000109374c15 ___forwarding___ + 1013
4 CoreFoundation 0x0000000109374798 _CF_forwarding_prep_0 + 120
5 UIKit 0x0000000109814b88 -[UIApplication sendAction:to:from:forEvent:] + 83
6 UIKit 0x000000010999a2b2 -[UIControl sendAction:to:forEvent:] + 67
7 UIKit 0x000000010999a5cb -[UIControl _sendActionsForEvents:withEvent:] + 444
8 UIKit 0x00000001099994c7 -[UIControl touchesEnded:withEvent:] + 668
9 UIKit 0x0000000109d4b1dc _UIGestureEnvironmentSortAndSendDelayedTouches + 5645
10 UIKit 0x0000000109d45ea3 _UIGestureEnvironmentUpdate + 1472
11 UIKit 0x0000000109d4589b -[UIGestureEnvironment _deliverEvent:toGestureRecognizers:usingBlock:] + 521
12 UIKit 0x0000000109d44a7e -[UIGestureEnvironment _updateGesturesForEvent:window:] + 286
13 UIKit 0x00000001098837ad -[UIWindow sendEvent:] + 3989
14 UIKit 0x0000000109830a33 -[UIApplication sendEvent:] + 371
15 UIKit 0x000000010a022b6d __dispatchPreprocessedEventFromEventQueue + 3248
16 UIKit 0x000000010a01b817 __handleEventQueue + 4879
17 CoreFoundation 0x0000000109394311 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
18 CoreFoundation 0x000000010937959c __CFRunLoopDoSources0 + 556
19 CoreFoundation 0x0000000109378a86 __CFRunLoopRun + 918
20 CoreFoundation 0x0000000109378494 CFRunLoopRunSpecific + 420
21 GraphicsServices 0x000000010cd78a6f GSEventRunModal + 161
22 UIKit 0x0000000109812f34 UIApplicationMain + 159
23 Lit 0x0000000106fda27f main + 111
24 libdyld.dylib 0x000000010ba3668d start + 1
25 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
最佳答案
Selector("upVoteAction")
和
func upVoteAction(sender: UIButton)
不相同，所以它根本找不到那个方法。您需要添加将前者更改为
Selector("upVoteAction:")
因为您的实际方法有一个参数。
编辑:根据@rmaddy 的评论，swift 3 方式类似于:
#selector(upVoteAction(sender:))
关于swift - 单击单元格按钮时应用程序崩溃，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40534641/