Tableview简单显示值 [英] Tableview simple display value
本文介绍了Tableview简单显示值的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我是swift3的新手和初学者。在这里，我只想在tableview中显示First，Second，Third，它看起来不太好。
来自youtube的教程是swift2和我试图转换成swift3。我认为问题与代码有关：
让Cell = self.tableView.dequeueReusableCell（withIdentifier：Cell，用于： indexPath）as UITableViewCell
我努力搜索
控制台中的结果：
2016-10-24 01：10：38.111399 TableApp [27276：2609723] subsystem：com.apple.UIKit，category：HIDEventFiltered，enable_level：0，persist_level：0，default_ttl： 0，info_ttl：0，debug_ttl：0，generate_symptoms：0，enable_oversize：1，privacy_setting：2，enable_private_data：0
2016-10-24 01：10：38.114012 TableApp [27276：2609723] subsystem：com.apple .UIKit，类别：HIDEventIncoming，enable_level：0，persist_level：0，default_ttl：0，info_ttl：0，debug_ttl：0，generate_symptoms：0，enable_oversize：1，隐私_setting：2，enable_private_data：0
2016-10-24 01：10：38.122822 TableApp [27276：2609719] subsystem：com.apple.BaseBoard，category：MachPort，enable_level：1，persist_level：0，default_ttl：0 ，info_ttl：0，debug_ttl：0，generate_symptoms：0，enable_oversize：0，privacy_setting：0，enable_private_data：0
2016-10-24 01：10：38.138706 TableApp [27276：2609660] subsystem：com.apple。 UIKit，类别：StatusBar，enable_level：0，persist_level：0，default_ttl：0，info_ttl：0，debug_ttl：0，generate_symptoms：0，enable_oversize：1，privacy_setting：2，enable_private_data：0
2016-10-24 01：10：38.200 TableApp [27276：2609660] ***断言失败 - [UITableView _configureCellForDisplay：forIndexPath：]，/ BuildRoot / Library / Cache / com.apple.xbs / Sources / UIKit_Sim / UIKit-3599.6 / UITableView.m ：8035
2016-10-24 01：10：38.203 TableApp [27276：2609660] ***由于未捕获异常'NSInternalInconsistencyException'而终止应用程序，原因：'UITableView（< UITableView：0x7fbac906bc00; frame =（0 0; 375 667）; clipsToBounds = YES; autoresize = W + H; gestureRecognizers =< NSArray：0x61000004e400> ;; layer =< CALayer：0x610000235ce0> ;; contentOffset：{0，-64}; contentSize：{375,132}>）无法从其dataSource获取一个单元格（< TableApp.GetStringViewController：0x7fbac8d06180>）'
***第一次抛出调用堆栈：
（
0 CoreFoundation 0x000000010fab034b __exceptionPreprocess + 171
1 libobjc.A.dylib 0x000000010c9dc21e objc_exception_throw + 48
2 CoreFoundation 0x000000010fab4442 + [NSException raise：format：arguments：] + 98
3 Foundation 0x000000010c572edd - [NSAssertionHandler handleFailureInMethod ：object：file：lineNumber：description：] + 195
4 UIKit 0x000000010d429ff2 - [UITableView _configureCellForDisplay：forIndexPath：] + 222
5 UIKit 0x000000010d435c10 - [UITableView _createPreparedCellForGlobalRow：withIndexPath：willDisplay：] + 860
6 UIKit 0x000000010d435e07 - [UITableView _createPrep aredCellForGlobalRow：willDisplay：] + 74
7 UIKit 0x000000010d409871 - [UITableView _updateVisibleCellsNow：isRecursive：] + 3295
8 UIKit 0x000000010d43f189 - [UITableView _performWithCachedTraitCollection：] + 110
9 UIKit 0x000000010d4259e3 - [UITableView layoutSubviews ] + 222
10 UIKit 0x000000010d38d344 - [UIView（CALayerDelegate）layoutSublayersOfLayer：] + 1237
11 QuartzCore 0x0000000112875cdc - [CALayer layoutSublayers] + 146
12 QuartzCore 0x00000001128697a0 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 366
13 QuartzCore 0x000000011286961e _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24
14 QuartzCore 0x00000001127f762c _ZN2CA7Context18commit_transactionEPNS_11Transaction E + 280
15分配QuartzCore 0x0000000112824713 _ZN2CA11Transaction6commitEv + 475
16分配QuartzCore 0x0000000112825083 _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 113
17分配的CoreFoundation 0x000000010fa54e17 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
18分配的CoreFoundation 0x000000010fa54d87 __CFRunLoopDoObservers + 391
19分配的CoreFoundation 0x000000010fa394b6 CFRunLoopRunSpecific + 454
20 UIKit 0x000000010d2c2db6 - [UIApplication _run] + 434
21 UIKit 0x000000010d2c8f34 UIApplicationMain + 159
22 TableApp 0x000000010c3fb5bf main + 111
23 libdyld.dylib 0x00000001109da68d start + 1
）
libc ++ abi.dylib：以NSExc类型的未捕获异常终止eption
（lldb）
解决方案
试试这段代码：在Swift 3中测试代码。
注意：正如你所提到的，你刚开始编写Swift 3.I创建了一个tableView以编程方式。只是，复制下面的代码并粘贴到你的viewController.run项目......
import UIKit
class ViewController：UIViewController，UITableViewDelegate，UITableViewDataSource {
private let MyArray：NSArray = [First，Second，Third]
private var myTableView：UITableView！
覆盖func viewDidLoad（）{
super.viewDidLoad（）
//状态栏
let barHeight：CGFloat = UIApplication.shared.statusBarFrame。 size.height
//查看
let displayWidth：CGFloat = self.view.frame.width
let displayHeight：CGFloat = self.view.frame.height
// TableView
myTableView = UITableView（框架：CGRect（x：0，y：barHeight，width：displayWidth，height：displayHeight - barHeight））
// Cell
myTableView.register（UITableViewCell.self，forCellReuseIdentifier：MyCell）
// DataSource
myTableView.dataSource = self
//委托
myTableView.delegate = self
//查看
self.view.addSubview（myTableView）
}
覆盖func didReceiveMemoryWarning（）{
super.didReceiveMemoryWarning（）
}
func tableView（_ tableView：UITableView，didSelectRowAt indexPath：IndexPath） {
print（Num：\（indexPath.row））
print（Value：\（MyArray [indexPath.row]））
}
func tableView（_ tableView：UITableView，numberOfRowsInSection section：Int） - > Int {
return MyArray.count
}
func tableView（_ tableView：UITableView，cellForRowAt indexPath：IndexPath） - > UITableViewCell {
let cell = tableView.dequeueReusableCell（withIdentifier：MyCell，for：indexPath as IndexPath）
cell.textLabel！.text =\（MyArray [ indexPath.row]）
返回单元格
}
}
输出：
I am a stduent and very beginner of swift3. In here, I just want to display "First","Second","Third" in the tableview and it does not look good.
The tutorial from the youtube is swift2 and I try to convert into swift3. I think the problem is related to code:
let Cell = self.tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as UITableViewCell
I try hard to search like https://www.codeschool.com/blog/2016/09/14/evolving-to-swift-3/ but I dont know what happen. The Xcode cannot detect any error of the code and it can run. The tableview in iphone simulator is empty or whole screen is black.
I use the navigation controller to implement it. The class in viewcontoller and iderntifer in table view cell are well set in the root view contoller. Please help me. Thanks.
import Foundation
import UIKit
class ViewController: UITableViewController {
var Array = [String]()
override func viewDidLoad() {
super.viewDidLoad()
Array = ["First","Second","Third"]
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return Array.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let Cell = self.tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as UITableViewCell
Cell.textLabel?.text = Array[indexPath.row]
return Cell
}
}
Result in console:
2016-10-24 01:10:38.111399 TableApp[27276:2609723] subsystem: com.apple.UIKit, category: HIDEventFiltered, enable_level: 0, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 1, privacy_setting: 2, enable_private_data: 0
2016-10-24 01:10:38.114012 TableApp[27276:2609723] subsystem: com.apple.UIKit, category: HIDEventIncoming, enable_level: 0, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 1, privacy_setting: 2, enable_private_data: 0
2016-10-24 01:10:38.122822 TableApp[27276:2609719] subsystem: com.apple.BaseBoard, category: MachPort, enable_level: 1, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 0, privacy_setting: 0, enable_private_data: 0
2016-10-24 01:10:38.138706 TableApp[27276:2609660] subsystem: com.apple.UIKit, category: StatusBar, enable_level: 0, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 1, privacy_setting: 2, enable_private_data: 0
2016-10-24 01:10:38.200 TableApp[27276:2609660] *** Assertion failure in -[UITableView _configureCellForDisplay:forIndexPath:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-3599.6/UITableView.m:8035
2016-10-24 01:10:38.203 TableApp[27276:2609660] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'UITableView (<UITableView: 0x7fbac906bc00; frame = (0 0; 375 667); clipsToBounds = YES; autoresize = W+H; gestureRecognizers = <NSArray: 0x61000004e400>; layer = <CALayer: 0x610000235ce0>; contentOffset: {0, -64}; contentSize: {375, 132}>) failed to obtain a cell from its dataSource (<TableApp.GetStringViewController: 0x7fbac8d06180>)'
*** First throw call stack:
(
0 CoreFoundation 0x000000010fab034b __exceptionPreprocess + 171
1 libobjc.A.dylib 0x000000010c9dc21e objc_exception_throw + 48
2 CoreFoundation 0x000000010fab4442 +[NSException raise:format:arguments:] + 98
3 Foundation 0x000000010c572edd -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 195
4 UIKit 0x000000010d429ff2 -[UITableView _configureCellForDisplay:forIndexPath:] + 222
5 UIKit 0x000000010d435c10 -[UITableView _createPreparedCellForGlobalRow:withIndexPath:willDisplay:] + 860
6 UIKit 0x000000010d435e07 -[UITableView _createPreparedCellForGlobalRow:willDisplay:] + 74
7 UIKit 0x000000010d409871 -[UITableView _updateVisibleCellsNow:isRecursive:] + 3295
8 UIKit 0x000000010d43f189 -[UITableView _performWithCachedTraitCollection:] + 110
9 UIKit 0x000000010d4259e3 -[UITableView layoutSubviews] + 222
10 UIKit 0x000000010d38d344 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 1237
11 QuartzCore 0x0000000112875cdc -[CALayer layoutSublayers] + 146
12 QuartzCore 0x00000001128697a0 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 366
13 QuartzCore 0x000000011286961e _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24
14 QuartzCore 0x00000001127f762c _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 280
15 QuartzCore 0x0000000112824713 _ZN2CA11Transaction6commitEv + 475
16 QuartzCore 0x0000000112825083 _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 113
17 CoreFoundation 0x000000010fa54e17 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
18 CoreFoundation 0x000000010fa54d87 __CFRunLoopDoObservers + 391
19 CoreFoundation 0x000000010fa394b6 CFRunLoopRunSpecific + 454
20 UIKit 0x000000010d2c2db6 -[UIApplication _run] + 434
21 UIKit 0x000000010d2c8f34 UIApplicationMain + 159
22 TableApp 0x000000010c3fb5bf main + 111
23 libdyld.dylib 0x00000001109da68d start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
解决方案
Try This code: Code tested in Swift 3.
Note: As you mentioned you just started programming Swift 3.I created a tableView programmatically. Just,copy below code and paste in to your viewController.run the project...
import UIKit
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
private let MyArray: NSArray = ["First","Second","Third"]
private var myTableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
// Status Bar
let barHeight: CGFloat = UIApplication.shared.statusBarFrame.size.height
// View
let displayWidth: CGFloat = self.view.frame.width
let displayHeight: CGFloat = self.view.frame.height
// TableView
myTableView = UITableView(frame: CGRect(x: 0, y: barHeight, width: displayWidth, height: displayHeight - barHeight))
// Cell
myTableView.register(UITableViewCell.self, forCellReuseIdentifier: "MyCell")
// DataSource
myTableView.dataSource = self
// Delegate
myTableView.delegate = self
// View
self.view.addSubview(myTableView)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
print("Num: \(indexPath.row)")
print("Value: \(MyArray[indexPath.row])")
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return MyArray.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "MyCell", for: indexPath as IndexPath)
cell.textLabel!.text = "\(MyArray[indexPath.row])"
return cell
}
}
Output:
这篇关于Tableview简单显示值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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