问题描述
我正在使用以下代码向ios应用中的一些视图添加可设计的功能：
@IBDesignable
class DesignableView: UIView {
}
@IBDesignable
class DesignableButton: UIButton {
}
@IBDesignable
class DesignableLabel: UILabel {
}
extension UIView {
@IBInspectable
var cornerRadius: CGFloat {
get {
return layer.cornerRadius
}
set {
layer.cornerRadius = newValue
}
}
@IBInspectable
var borderWidth: CGFloat {
get {
return layer.borderWidth
}
set {
layer.borderWidth = newValue
}
}
@IBInspectable
var borderColor: UIColor? {
get {
if let color = layer.borderColor {
return UIColor(cgColor: color)
}
return nil
}
set {
if let color = newValue {
layer.borderColor = color.cgColor
} else {
layer.borderColor = nil
}
}
}
@IBInspectable
var shadowRadius: CGFloat {
get {
return layer.shadowRadius
}
set {
layer.shadowRadius = newValue
}
}
@IBInspectable
var shadowOpacity: Float {
get {
return layer.shadowOpacity
}
set {
layer.shadowOpacity = newValue
}
}
@IBInspectable
var shadowOffset: CGSize {
get {
return layer.shadowOffset
}
set {
layer.shadowOffset = newValue
}
}
@IBInspectable
var shadowColor: UIColor? {
get {
if let color = layer.shadowColor {
return UIColor(cgColor: color)
}
return nil
}
set {
if let color = newValue {
layer.shadowColor = color.cgColor
} else {
layer.shadowColor = nil
}
}
}
}
在未加载情节提要的情况下，如何不断出现“代理程序崩溃”的信息。该应用程序可以编译并正常运行。
崩溃日志如下：
Crashed Thread: 0
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000,0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Application Specific Information:
*** Terminating app due to uncaught exception 'NSInvalidArgumentException',reason: '*** -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objects[0]'
terminating with uncaught exception of type NSException
abort() called
CoreSimulator 704.12.2 - Device: iPad Pro (9.7-inch) (6CED57CA-A03B-463F-9399-C033AD65EB86) - Runtime: iOS 13.7 (17H22) - DeviceType: iPad Pro (9.7-inch)
Application Specific Backtrace 1:
0 CoreFoundation 0x00007fff23e3de6e __exceptionPreprocess + 350
1 libobjc.A.dylib 0x00007fff512a19b2 objc_exception_throw + 48
2 CoreFoundation 0x00007fff23ed09d1 _CFThrowFormattedException + 194
3 CoreFoundation 0x00007fff23edb426 -[__NSPlaceholderDictionary initWithObjects:forKeys:count:].cold.4 + 38
4 CoreFoundation 0x00007fff23e9c6e7 -[__NSPlaceholderDictionary initWithObjects:forKeys:count:] + 247
5 CoreFoundation 0x00007fff23e39d71 +[NSDictionary dictionaryWithObjects:forKeys:count:] + 49
6 UIKitCore 0x00007fff497b8d85 +[UILabel _defaultAttributes] + 403
7 UIKitCore 0x00007fff48d0cb29 __35+[UIButtonLabel _defaultAttributes]_block_invoke + 56
8 libdispatch.dylib 0x00007fff520dc8cb _dispatch_client_callout + 8
9 libdispatch.dylib 0x00007fff520ddb02 _dispatch_once_callout + 20
10 UIKitCore 0x00007fff48d0caef +[UIButtonLabel _defaultAttributes] + 97
11 UIKitCore 0x00007fff48d162a3 -[UIButton _deriveTitleRect:imageRect:fromContentRect:calculatePositionForEmptyTitle:] + 2312
12 UIKitCore 0x00007fff48d15878 -[UIButton _titleRectForContentRect:calculatePositionForEmptyTitle:] + 287
13 UIKitCore 0x00007fff48d1591f -[UIButton titleRectForContentRect:] + 49
14 UIKitCore 0x00007fff48d1af14 -[UIButton _setupTitleViewRequestingLayout:] + 156
15 UIKitCore 0x00007fff48d10e5f -[UIButton titleLabel] + 42
16 Foundation 0x00007fff2590f8ad -[NSObject(NSKeyValueCoding) valueForKey:] + 317
17 Foundation 0x00007fff259105ae -[NSObject(NSKeyValueCoding) setValue:forKeyPath:] + 251
18 IBCocoaTouchToolFoundation 0x00000001066452e3 __IBApplyMarshalledState_block_invoke + 425
19 IBCocoaTouchToolFoundation 0x0000000106644bc5 IBApplyMarshalledState + 512
20 IBCocoaTouchToolFoundation 0x0000000106624c62 -[UIButton(IBCocoaTouchToolIntegration) initWithMarshalledValues:orderedKeys:ignoredKeys:globalMarshallingContext:] + 302
21 IBCocoaTouchToolFoundation 0x0000000106645441 +[NSObject(IBCocoaTouchToolIntegration) instantiateWithMarshalledValues:orderedKeys:ignoredKeys:globalMarshallingContext:] + 118
22 IBCocoaTouchToolFoundation 0x00000001066619a8 -[IBCocoaTouchToolObjectPackage initWithRequest:globalMarshallingContext:] + 2473
23 IBCocoaTouchToolFoundation 0x00000001066608c0 +[IBCocoaTouchToolObjectPackage objectPackageFromRequest:] + 51
24 IBCocoaTouchToolFoundation 0x000000010666396c +[IBCocoaTouchToolObjectPackage decodeWithBinaryUnarchiver:] + 106
25 IBFoundation 0x000000010682d771 -[IBBinaryUnarchiver decodeObject] + 109
26 IBFoundation 0x00000001068d2e09 -[IBObjectBasedMarshallingRequest initWithBinaryUnarchiver:] + 128
27 IBAutolayoutFoundation 0x000000010678b366 -[IBFullSceneUpdateRequest initWithBinaryUnarchiver:] + 65
28 IBFoundation 0x0000000106824499 +[NSObject(IBBinaryArchivingAdditions) decodeWithBinaryUnarchiver:] + 49
29 IBFoundation 0x000000010682d771 -[IBBinaryUnarchiver decodeObject] + 109
30 IBFoundation 0x000000010682db63 -[IBBinaryUnarchiver decodeObjectReferenceIfPossible] + 74
31 IBFoundation 0x00000001068249b5 -[NSArray(IBBinaryArchivingAdditions) initWithBinaryUnarchiver:] + 184
32 IBFoundation 0x0000000106824499 +[NSObject(IBBinaryArchivingAdditions) decodeWithBinaryUnarchiver:] + 49
33 IBFoundation 0x000000010682d771 -[IBBinaryUnarchiver decodeObject] + 109
34 IBFoundation 0x000000010691e8f9 -[IBMessageReceiveChannel deliverMessage:toTarget:withArguments:context:result:] + 400
35 IBFoundation 0x000000010691e336 __88-[IBMessageReceiveChannel runBlockingReceiveLoopNotifyingQueue:notifyingTarget:context:]_block_invoke + 142
36 libdispatch.dylib 0x00007fff520dc8cb _dispatch_client_callout + 8
37 libdispatch.dylib 0x00007fff520e9940 _dispatch_async_and_wait_invoke + 109
38 libdispatch.dylib 0x00007fff520dc8cb _dispatch_client_callout + 8
39 libdispatch.dylib 0x00007fff520e8cdb _dispatch_main_queue_callback_4CF + 1042
40 CoreFoundation 0x00007fff23da1869 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9
41 CoreFoundation 0x00007fff23d9c3b9 __CFRunLoopRun + 2041
42 CoreFoundation 0x00007fff23d9b8a4 CFRunLoopRunSpecific + 404
43 Foundation 0x00007fff25967c71 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 211
44 IBFoundation 0x00000001068d99cd -[IBAbstractPlatformTool startServingReceiveChannel:] + 418
45 IBFoundation 0x00000001068d9c29 -[IBAbstractPlatformTool startServingWriteDescriptor:readDescriptor:] + 111
46 IBFoundation 0x00000001068daa8e +[IBAbstractPlatformTool main] + 1209
47 IBDesignablesAgent-iOS 0x000000010656e95f main + 34
48 libdyld.dylib 0x00007fff5211c1fd start + 1
49 ??? 0x0000000000000005 0x0 + 5
Thread 0 Crashed:
0 libsystem_kernel.dylib 0x00007fff5225a33a __pthread_kill + 10
1 libsystem_c.dylib 0x00007fff521e9b7c abort + 120
2 libc++abi.dylib 0x00007fff500ef858 abort_message + 231
3 libc++abi.dylib 0x00007fff500e0cbf demangling_terminate_handler() + 262
4 libobjc.A.dylib 0x00007fff512a1c0b _objc_terminate() + 96
5 libc++abi.dylib 0x00007fff500eec87 std::__terminate(void (*)()) + 8
6 libc++abi.dylib 0x00007fff500eec29 std::terminate() + 41
7 libdispatch.dylib 0x00007fff520dc8df _dispatch_client_callout + 28
8 libdispatch.dylib 0x00007fff520ddb02 _dispatch_once_callout + 20
9 com.apple.UIKitCore 0x00007fff48d0caef +[UIButtonLabel _defaultAttributes] + 97
10 com.apple.UIKitCore 0x00007fff48d162a3 -[UIButton _deriveTitleRect:imageRect:fromContentRect:calculatePositionForEmptyTitle:] + 2312
11 com.apple.UIKitCore 0x00007fff48d15878 -[UIButton _titleRectForContentRect:calculatePositionForEmptyTitle:] + 287
12 com.apple.UIKitCore 0x00007fff48d1591f -[UIButton titleRectForContentRect:] + 49
13 com.apple.UIKitCore 0x00007fff48d1af14 -[UIButton _setupTitleViewRequestingLayout:] + 156
14 com.apple.UIKitCore 0x00007fff48d10e5f -[UIButton titleLabel] + 42
15 com.apple.Foundation 0x00007fff2590f8ad -[NSObject(NSKeyValueCoding) valueForKey:] + 317
16 com.apple.Foundation 0x00007fff259105ae -[NSObject(NSKeyValueCoding) setValue:forKeyPath:] + 251
17 com.apple.IBCocoaTouchToolFoundation 0x00000001066452e3 __IBApplyMarshalledState_block_invoke + 425
18 com.apple.IBCocoaTouchToolFoundation 0x0000000106644bc5 IBApplyMarshalledState + 512
19 com.apple.IBCocoaTouchToolFoundation 0x0000000106624c62 -[UIButton(IBCocoaTouchToolIntegration) initWithMarshalledValues:orderedKeys:ignoredKeys:globalMarshallingContext:] + 302
20 com.apple.IBCocoaTouchToolFoundation 0x0000000106645441 +[NSObject(IBCocoaTouchToolIntegration) instantiateWithMarshalledValues:orderedKeys:ignoredKeys:globalMarshallingContext:] + 118
如何避免这些代理崩溃？
解决方法
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