Ios UIPickerView+；可访问性=崩溃

启用辅助功能时，我的自定义UIPickerView崩溃。我正在使用以下代码（简化；是的，我想/需要在这里为组件视图使用子视图）

-（UIView*）pickerView:（UIPickerView*）pickerView视图for行：（NSInteger）行for组件：（NSInteger）组件重用视图：（UIView*）视图 { UILabel*列视图； 如果（！视图） { view=[[UIView alloc]initWithFrame:CGRectMake（0,0,100,30）]； columnView=[[UILabel alloc]initWithFrame:CGRectMake（0,0,50.f,30）]； [视图添加子视图：columnView]； } 否则{ columnView=[视图子视图][0]； } columnView.text=[NSString stringWithFormat:@“%d”，行]； } 返回视图； } 堆栈：

* thread #1: tid = 0x1ffb16, 0x325a6c64 libobjc.A.dylib`objc_exception_throw, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1 frame #0: 0x325a6c64 libobjc.A.dylib`objc_exception_throw frame #1: 0x24ef8b48 CoreFoundation`-[NSException raise] + 8 frame #2: 0x25bdbdda Foundation`-[NSObject(NSKeyValueCoding) valueForUndefinedKey:] + 262 frame #3: 0x25b42ea6 Foundation`-[NSObject(NSKeyValueCoding) valueForKey:] + 202 frame #4: 0x292840ec AccessibilityUtilities`-[NSObject(UIAccessibilitySafeCategory) safeValueForKey:] + 104 frame #5: 0x2360c112 UIKit`-[UIAccessibilityPickerComponent accessibilityTraits] + 358 frame #6: 0x235e76c8 UIKit`__68-[UIApplicationAccessibility _findContainerAccessibleElement:first:]_block_invoke + 76 frame #7: 0x2f73dc1c UIAccessibility`-[NSObject(AXPrivCategory) accessibilityEnumerateContainerElementsWithOptions:usingBlock:] + 276 frame #8: 0x235e7602 UIKit`-[UIApplicationAccessibility _findContainerAccessibleElement:first:] + 330 frame #9: 0x235e7d76 UIKit`-[UIApplicationAccessibility _accessibilityElementFirst:last:forFocus:] + 490 frame #10: 0x235e80ba UIKit`-[UIApplicationAccessibility _accessibilityFirstElementForFocus] + 30 frame #11: 0x235ea8ec UIKit`-[UIApplicationAccessibility accessibilityAttributeValue:] + 352 frame #12: 0x2f7355a6 UIAccessibility`_copyAttributeValueCallback + 122 frame #13: 0x2920ceec AXRuntime`_AXXMIGCopyAttributeValue + 116 frame #14: 0x29208ea4 AXRuntime`_XCopyAttributeValue + 300 frame #15: 0x29212bb6 AXRuntime`mshMIGPerform + 242 frame #16: 0x24ebedaa CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 34 frame #17: 0x24ebed46 CoreFoundation`__CFRunLoopDoSource1 + 346 frame #18: 0x24ebd348 CoreFoundation`__CFRunLoopRun + 1608 frame #19: 0x24e0b620 CoreFoundation`CFRunLoopRunSpecific + 476 frame #20: 0x24e0b432 CoreFoundation`CFRunLoopRunInMode + 106 frame #21: 0x2c1b90a8 GraphicsServices`GSEventRunModal + 136 frame #22: 0x283f5808 UIKit`UIApplicationMain + 1440 * frame #23: 0x000db7f4 ds`main(argc=1, argv=0x001eab08) + 116 at main.m:14 *线程#1:tid=0x1ffb16，0x325a6c64 libobjc.A.dylib`objc_异常抛出，队列='com.apple.main thread'，停止原因=断点1.1 帧#0:0x325a6c64 libobjc.A.dylib`objc_异常_抛出 帧#1:0x24ef8b48 CoreFoundation`-[N异常提升]+8 帧#2:0x25BDDA基础`-[NSObject（NSKeyValueCoding）值FORUNDEFINEDKEY:+262 帧#3:0x25b42ea6基础`-[NSObject（NSKeyValueCoding）valueForKey:+202 帧#4:0x292840ec可访问性实用程序`-[NSObject（UIAccessibilitySafectory）安全值forkey:+104 帧#5:0x2360c112 UIKit`-[UIAccessibilityPickerComponent accessibilityTraits]+358 帧#6:0x235e76c8 UIKit`uu 68-[UIApplicationAccessibility\u findContainerAccessibleElement:first:][u block\u invoke+76 帧#7:0x2f73dc1c UIAccessibility`-[NSObject（AXPrivCategory）Accessibility NumerateContainerElements with Options:usingBlock:+276 帧#8:0x235e7602 UIKit`-[UIApplicationAccessibility\u findContainerAccessibleElement:first:+330 帧#9:0x235e7d76 UIKit`-[UIApplicationAccessibility\U accessibilityElementFirst:last:forFocus:+490 帧#10:0x235e80ba UIKit`-[UIApplicationAccessibility\U accessibilityFirstElementForFocus]+30 帧#11:0x235ea8ec UIKit`-[UIApplicationAccessibility accessibilityAttributeValue:+352 帧#12:0x2F735A6 UIAccessibility`\U copyAttributeValueCallback+122 帧#13:0x2920ceec AXRuntime`\u AXXMIGCopyAttributeValue+116 帧#14:0x29208ea4 AXRuntime`\u XCopyAttributeValue+300 帧#15:0x29212bb6 AXRuntime`mshMIGPerform+242 帧#16:0x24ebedaa CoreFoundation`\uu CFRUNLOOP\u正在调用\u OUT\u以执行\u SOURCE1\u函数\uuu+34 帧#17:0x24ebed46 CoreFoundation`\uu CFRunLoopDoSource1+346 帧#18:0x24ebd348 CoreFoundation`u CFRunLoopRun+1608 帧#19:0x24e0b620 CoreFoundation`CFRunLoopRunSpecific+476 帧#20:0x24e0b432 CoreFoundation`CFRunLoopRunInMode+106 帧#21:0x2c1b90a8 GraphicsServices`GSEventRunModal+136 帧#22:0x283f5808 UIKit`UIApplicationMain+1440 *帧#23:0x000db7f4 ds`main（argc=1，argv=0x001eab08）+116位于main处。m:14

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有什么想法吗？

对我来说似乎是一个重复的问题。目前还没有人对此做出解释：（我现在正在使用一种变通方法，也许它也会对您有所帮助：。 * thread #1: tid = 0x1ffb16, 0x325a6c64 libobjc.A.dylib`objc_exception_throw, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1 frame #0: 0x325a6c64 libobjc.A.dylib`objc_exception_throw frame #1: 0x24ef8b48 CoreFoundation`-[NSException raise] + 8 frame #2: 0x25bdbdda Foundation`-[NSObject(NSKeyValueCoding) valueForUndefinedKey:] + 262 frame #3: 0x25b42ea6 Foundation`-[NSObject(NSKeyValueCoding) valueForKey:] + 202 frame #4: 0x292840ec AccessibilityUtilities`-[NSObject(UIAccessibilitySafeCategory) safeValueForKey:] + 104 frame #5: 0x2360c112 UIKit`-[UIAccessibilityPickerComponent accessibilityTraits] + 358 frame #6: 0x235e76c8 UIKit`__68-[UIApplicationAccessibility _findContainerAccessibleElement:first:]_block_invoke + 76 frame #7: 0x2f73dc1c UIAccessibility`-[NSObject(AXPrivCategory) accessibilityEnumerateContainerElementsWithOptions:usingBlock:] + 276 frame #8: 0x235e7602 UIKit`-[UIApplicationAccessibility _findContainerAccessibleElement:first:] + 330 frame #9: 0x235e7d76 UIKit`-[UIApplicationAccessibility _accessibilityElementFirst:last:forFocus:] + 490 frame #10: 0x235e80ba UIKit`-[UIApplicationAccessibility _accessibilityFirstElementForFocus] + 30 frame #11: 0x235ea8ec UIKit`-[UIApplicationAccessibility accessibilityAttributeValue:] + 352 frame #12: 0x2f7355a6 UIAccessibility`_copyAttributeValueCallback + 122 frame #13: 0x2920ceec AXRuntime`_AXXMIGCopyAttributeValue + 116 frame #14: 0x29208ea4 AXRuntime`_XCopyAttributeValue + 300 frame #15: 0x29212bb6 AXRuntime`mshMIGPerform + 242 frame #16: 0x24ebedaa CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 34 frame #17: 0x24ebed46 CoreFoundation`__CFRunLoopDoSource1 + 346 frame #18: 0x24ebd348 CoreFoundation`__CFRunLoopRun + 1608 frame #19: 0x24e0b620 CoreFoundation`CFRunLoopRunSpecific + 476 frame #20: 0x24e0b432 CoreFoundation`CFRunLoopRunInMode + 106 frame #21: 0x2c1b90a8 GraphicsServices`GSEventRunModal + 136 frame #22: 0x283f5808 UIKit`UIApplicationMain + 1440 * frame #23: 0x000db7f4 ds`main(argc=1, argv=0x001eab08) + 116 at main.m:14