为什么UITableviewCell UINib init崩溃？

Question

我在视图中使用UITableviewCell，使用UINib并将其添加到contentView中。

当我从test调试或测试时，我没有发现任何错误，但是Crashlytics有很多崩溃

0x102d20 std::__1::vector<unsigned char, geo::StdAllocator<unsigned char, 
ggl::Allocator> >::__append(unsigned long) + 208
1  VectorKit                      0x102ce0 std::__1::vector<unsigned char, 
geo::StdAllocator<unsigned char, ggl::Allocator> >::__append(unsigned long) + 144
2  VectorKit                      0x10b7cc ggl::BufferData::BufferData(unsigned long, 
ggl::BufferType, ggl::BufferChange, ggl::BufferUsage, unsigned long) + 196
3  VectorKit                      0x200e38 
6  VectorKit                      0x61eb8 md::MapEngine::updateForConfigurationAndMode() + 1376
7  VectorKit                      0xada9c md::MapEngine::MapEngine(float, float, float, bool, VKMapViewPurpose, std::__1::shared_ptr<md::TaskContext> const&, VKMapPurpose, std::__1::unique_ptr<md::AnimationManager, std::__1::default_delete<md::AnimationManager> >, geo::linear_map<md::MapEngineSetting, long long, std::__1::equal_to<md::MapEngineSetting>, std::__1::allocator<std::__1::pair<md::MapEngineSetting, long long> >, std::__1::vector<std::__1::pair<md::MapEngineSetting, long long>, std::__1::allocator<std::__1::pair<md::MapEngineSetting, long long> > > > const&, unsigned long long, GEOApplicationAuditToken*) + 13772
8  VectorKit                      0x1070d8 md::MapEngine::interactiveMapEngine(float, bool, VKMapViewPurpose, geo::linear_map<md::MapEngineSetting, long long, std::__1::equal_to<md::MapEngineSetting>, std::__1::allocator<std::__1::pair<md::MapEngineSetting, long long> >, std::__1::vector<std::__1::pair<md::MapEngineSetting, long long>, std::__1::allocator<std::__1::pair<md::MapEngineSetting, long long> > > > const&, unsigned long long, GEOApplicationAuditToken*) + 152
9  VectorKit                      0x2619fc -[VKMapView initShouldRasterize:inBackground:contentScale:auditToken:mapViewPurpose:allowsAntialiasing:] + 936
10 MapKit                         0x141570 -[MKBasicMapView initWithFrame:andGlobe:shouldRasterize:allowsAntialiasing:] + 388
11 MapKit                         0x75094 -[MKMapView _commonInitFromIB:gestureRecognizerHostView:locationManager:showsAttribution:showsAppleLogo:allowsAntialiasing:] + 1668
12 MapKit                         0x7606c -[MKMapView initWithCoder:] + 252
13 UIFoundation                   0x63588 UINibDecoderDecodeObjectForValue + 704
14 UIFoundation                   0x637b4 UINibDecoderDecodeObjectForValue + 1260
15 UIFoundation                   0x3a58 -[UINibDecoder decodeObjectForKey:] + 324
16 UIKitCore                      0x45cac8 -[UIView initWithCoder:] + 976
17 UIFoundation                   0x63588 UINibDecoderDecodeObjectForValue + 704
18 UIFoundation                   0x637b4 UINibDecoderDecodeObjectForValue + 1260
19 UIFoundation                   0x3a58 -[UINibDecoder decodeObjectForKey:] + 324
20 UIKitCore                      0x45cac8 -[UIView initWithCoder:] + 976
21 UIKitCore                      0x20310 -[UITableViewCellContentView initWithCoder:] + 48
22 UIFoundation                   0x63588 UINibDecoderDecodeObjectForValue + 704
23 UIFoundation                   0x637b4 UINibDecoderDecodeObjectForValue + 1260
24 UIFoundation                   0x3a58 -[UINibDecoder decodeObjectForKey:] + 324
25 UIKitCore                      0x45cac8 -[UIView initWithCoder:] + 976
26 UIKitCore                      0xddd54 -[UITableViewCell initWithCoder:] + 100
27                           0x20b8c8 init + 45 (LocationFieldTableViewCell.swift:45)
28                           0x20ad98 init + 4341656984 (<compiler-generated>:4341656984)
29 UIKitCore                      0x414d3c -[UIClassSwapper initWithCoder:] + 2120
30 UIFoundation                   0x63588 UINibDecoderDecodeObjectForValue + 704
31 UIFoundation                   0x3a58 -[UINibDecoder decodeObjectForKey:] + 324
32 UIKitCore                      0x592ba8 -[UIRuntimeConnection initWithCoder:] + 132
33 UIFoundation                   0x63588 UINibDecoderDecodeObjectForValue + 704
34 UIFoundation                   0x637b4 UINibDecoderDecodeObjectForValue + 1260
35 UIFoundation                   0x3a58 -[UINibDecoder decodeObjectForKey:] + 324
36 UIKitCore                      0x595468 -[NSCoder(UIIBDependencyInjectionInternal) _decodeObjectsWithSourceSegueTemplate:creator:sender:forKey:] + 492
37 UIKitCore                      0x5343e4 -[UINib instantiateWithOwner:options:] + 1052
38                           0x209168 instanceFromNib + 74 (LocationFieldTableViewCell.swift:74)

Answer 1

让表视图通过在表视图中注册nib来为您创建单元格。这使表视图只创建填充屏幕所需的实例数。例如：

class ViewController: UITableViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        
        // Assuming a nib exists named LocationFieldTableViewCell in the main bundle
        let nib = UINib(nibName: "LocationFieldTableViewCell", bundle: .main)
        
        tableView.register(nib, forCellReuseIdentifier: "my-id")
    }
    
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "my-id", for: indexPath) as? LocationFieldTableViewCell
        
        // configure cell
        
        return cell
    }

}

阅读UITableView和单元重用是如何工作的！

就崩溃而言，您可能可以通过以下指南获得更多信息：https://developer.apple.com/news/?id=nra79npr

这将让您浏览代码并查看代码崩溃的位置，很可能是nib中的一些东西没有正确解码--看看日志(LocationFieldTableViewCell.swift:74)，LocationFieldTableViewCell.swift的第74行是什么？这可能就是问题所在。