iOS 17.4模拟器点击UITextField触发CLLocationButton崩溃问题咨询

环境信息 #

• Xcode 15.3
• MacBook Air M1（8GB）
• macOS Sonoma 14.4
• iOS 17.4模拟器
• 搭载iOS 15.8的iPhone SE第一代真机无此问题

崩溃现象 #

点击UITextField时App直接崩溃，错误提示：

Thread 1: "*** -[__NSDictionaryM setObject:forKey:]: object cannot be nil (key: arrow.uturn.forward)"

复现代码 #

import UIKit
import CoreLocationUI

class ViewController: UIViewController {
    let textField: UITextField = {
        let tf = UITextField()
        tf.backgroundColor = .systemGray6
        tf.placeholder = "Tap me"
        tf.leftView = UIView(frame: .init(x: 0, y: 0, width: 8, height: 0))
        tf.leftViewMode = .always
        tf.layer.cornerRadius = 11
        return tf
    }()
    let locationButton = CLLocationButton()

    override func viewDidLoad() {
        super.viewDidLoad()
        
        view.backgroundColor = .systemBackground
        
        view.addSubview(textField)
        view.addSubview(locationButton)
        
        textField.translatesAutoresizingMaskIntoConstraints = false
        locationButton.translatesAutoresizingMaskIntoConstraints = false
        
        NSLayoutConstraint.activate([
            textField.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            textField.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 8),
            textField.widthAnchor.constraint(equalTo: view.widthAnchor, multiplier: 0.85),
            textField.heightAnchor.constraint(equalToConstant: 44),
            
            locationButton.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            locationButton.topAnchor.constraint(equalTo: textField.bottomAnchor, constant: 8),
            locationButton.widthAnchor.constraint(equalTo: view.widthAnchor, multiplier: 0.85),
            locationButton.heightAnchor.constraint(equalToConstant: 44),
        ])
    }
}

控制台完整日志 #

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSDictionaryM setObject:forKey:]: object cannot be nil (key: arrow.uturn.forward)'
*** First throw call stack:
(
    0   CoreFoundation                      0x00000001804ae138 __exceptionPreprocess + 172
    1   libobjc.A.dylib                     0x0000000180087db4 objc_exception_throw + 56
    2   CoreFoundation                      0x000000018051e88c -[__NSDictionaryM setObject:forKey:] + 1232
    3   UIKitCore                           0x00000001856c0f44 +[UIAssistantBarButtonItemProvider configuredSymbolImageWithName:size:] + 344
    4   UIKitCore                           0x00000001856c00bc +[UIAssistantBarButtonItemProvider barButtonItemForAssistantItemStyle:target:forcePlainButton:] + 2120
    5   UIKitCore                           0x00000001856c1200 +[UIAssistantBarButtonItemProvider defaultSystemLeadingBarButtonGroupsForItem:] + 204
    6   UIKitCore                           0x00000001856c1754 +[UIAssistantBarButtonItemProvider systemDefaultAssistantItem] + 48
    7   UIKitCore                           0x0000000185417e0c -[UIResponder(UIResponderInputViewAdditions) inputAssistantItem] + 64
    8   UIKitCore                           0x0000000185717710 -[UITextField inputAssistantItem] + 64
    9   UIKitCore                           0x0000000185417d4c _UIResponderFindInputAssistantItem + 44
    10  UIKitCore                           0x0000000184d79c18 -[UISystemInputAssistantViewController isVisibleWhenMinimized] + 96
    11  UIKitCore                           0x000000018523c12c +[UIPeripheralHost(UIKitInternal) endPlacementForInputViewSet:windowScene:] + 1292
    12  UIKitCore                           0x0000000184e0b2d0 -[UIKeyboardSceneDelegate prepareToMoveKeyboardForInputViewSet:animationStyle:] + 192
    13  UIKitCore                           0x0000000184e0a060 -[UIKeyboardSceneDelegate setKeyWindowSceneInputViews:animationStyle:] + 1396
    14  UIKitCore                           0x0000000184e09ab8 -[UIKeyboardSceneDelegate setInputViews:animationStyle:] + 132
    15  UIKitCore                           0x0000000184e0aaa4 -[UIKeyboardSceneDelegate setInputViews:animated:] + 72
    16  UIKitCore                           0x0000000184e0aaf4 -[UIKeyboardSceneDelegate setInputViews:] + 52
    17  UIKitCore                           0x0000000184e081f0 __102-[UIKeyboardSceneDelegate _reloadInputViewsForKeyWindowSceneResponder:force:fromBecomeFirstResponder:]_block_invoke.484 + 24
    18  UIKitCore                           0x00000001852386e0 __65-[UIPeripheralHost(UIKitInternal) queueDelayedTask:forKey:delay:]_block_invoke + 156
    19  libdispatch.dylib                   0x00000001016fd73c _dispatch_client_callout + 16
    20  libdispatch.dylib                   0x0000000101700c14 _dispatch_continuation_pop + 756
    21  libdispatch.dylib                   0x00000001017164e0 _dispatch_source_invoke + 1736
    22  libdispatch.dylib                   0x000000010170d2a8 _dispatch_main_queue_drain + 892
    23  libdispatch.dylib                   0x000000010170cf1c _dispatch_main_queue_callback_4CF + 40
    24  CoreFoundation                      0x000000018040e9a0 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 12
    25  CoreFoundation                      0x00000001804090b8 __CFRunLoopRun + 1936
    26  CoreFoundation                      0x0000000180408514 CFRunLoopRunSpecific + 572
    27  GraphicsServices                    0x000000018ef06ae4 GSEventRunModal + 160
    28  UIKitCore                           0x00000001853e8040 -[UIApplication _run] + 868
    29  UIKitCore                           0x00000001853ebcc8 UIApplicationMain + 124
    30  UIKitCore                           0x000000018488c1cc __swift_destroy_boxed_opaque_existential_1Tm + 10048
    31  Crash_CLLocationButton              0x000000010057044c $sSo21UIApplicationDelegateP5UIKitE4mainyyFZ + 120
    32  Crash_CLLocationButton              0x00000001005703c4 $s22Crash_CLLocationButton11AppDelegateC5$mainyyFZ + 44
    33  Crash_CLLocationButton              0x00000001005704c8 main + 28
    34  dyld                                0x00000001005d1544 start_sim + 20
    35  ???                                 0x00000001006e60e0 0x0 + 4302201056
    36  ???                                 0x027c800000000000 0x0 + 179158822676332544
)
libc++abi: terminating due to uncaught exception of type NSException

问题分析与临时解决 #

从崩溃栈可以看出，问题根源是iOS 17.4模拟器的UIKit内部在加载系统符号arrow.uturn.forward时返回nil，导致设置字典对象时触发异常。结合真机无此问题的表现，这基本可以确定是模拟器专属Bug。

临时规避方案：禁用UITextField的系统输入助理栏按钮，在viewDidLoad中添加以下代码：

textField.inputAssistantItem.leadingBarButtonGroups = []
textField.inputAssistantItem.trailingBarButtonGroups = []

内容的提问来源于stack exchange，提问作者Filippo