I am a newbie who is learning OC.
But now when I set an outlet button as a property of my viewcontroller, in order to add an attribute for it, when I write some methods in viewDidLoad, something wrong happened like this:
The only thing I want to do is to set the attributes of the outLetButton.currentTitle
And my code is as follows:
There is nothing wrong with my button.
(void)viewDidLoad {
[super viewDidLoad];
/
NSMutableAttributedString * title = [[NSMutableString alloc] initWithString:self.OutletButton.currentTitle] ;
[title setAttributes:@{NSStrokeWidthAttributeName:@3.0,NSStrokeColorAttributeName:[self.OutletButton tintColor]} range:NSMakeRange(0, [title length])] ;
[self.OutletButton setAttributedTitle:title forState:UIControlStateNormal] ;
}
I used breakout debugging, when I step over [title setAttributes...], it crashed.
First throw call stack
0 CoreFoundation 0x000000010ba0b12b __exceptionPreprocess + 171
1 libobjc.A.dylib 0x000000010b09ff41 objc_exception_throw + 48
2 CoreFoundation 0x000000010ba8c024 -[NSObject(NSObject) doesNotRecognizeSelector:] + 132
3 CoreFoundation 0x000000010b98df78 forwarding + 1432
4 CoreFoundation 0x000000010b98d958 _CF_forwarding_prep_0 + 120
5 UITextView 0x000000010a791106 -[ViewController viewDidLoad] + 598
6 UIKit 0x000000010c03146c -[UIViewController loadViewIfRequired] + 1235
7 UIKit 0x000000010c0318b9 -[UIViewController view] + 27
8 UIKit 0x000000010befc7cf -[UIWindow addRootViewControllerViewIfPossible] + 122
9 UIKit 0x000000010befced7 -[UIWindow _setHidden:forced:] + 294
10 UIKit 0x000000010bf0fe54 -[UIWindow makeKeyAndVisible] + 42
11 UIKit 0x000000010be828b8 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 4737
12 UIKit 0x000000010be87aeb -[UIApplication _runWithMainScene:transitionContext:completion:] + 1720
13 UIKit 0x000000010c2516f8 __111-[__UICanvasLifecycleMonitor_Compatability _scheduleFirstCommitForScene:transition:firstActivation:completion:]_block_invoke + 924
14 UIKit 0x000000010c6274c8 +[_UICanvas _enqueuePostSettingUpdateTransactionBlock:] + 153
15 UIKit 0x000000010c2512f1 -[__UICanvasLifecycleMonitor_Compatability _scheduleFirstCommitForScene:transition:firstActivation:completion:] + 249
16 UIKit 0x000000010c251b6b -[__UICanvasLifecycleMonitor_Compatability activateEventsOnly:withContext:completion:] + 696
17 UIKit 0x000000010cbcfa69 __82-[_UIApplicationCanvas _transitionLifecycleStateWithTransitionContext:completion:]_block_invoke + 262
18 UIKit 0x000000010cbcf922 -[_UIApplicationCanvas _transitionLifecycleStateWithTransitionContext:completion:] + 444
19 UIKit 0x000000010c8ac9c8 __125-[_UICanvasLifecycleSettingsDiffAction performActionsForCanvas:withUpdatedScene:settingsDiff:fromSettings:transitionContext:]_block_invoke + 221
20 UIKit 0x000000010caabb06 _performActionsWithDelayForTransitionContext + 100
21 UIKit 0x000000010c8ac88b -[_UICanvasLifecycleSettingsDiffAction performActionsForCanvas:withUpdatedScene:settingsDiff:fromSettings:transitionContext:] + 231
22 UIKit 0x000000010c626b25 -[_UICanvas scene:didUpdateWithDiff:transitionContext:completion:] + 392
23 UIKit 0x000000010be8636a -[UIApplication workspace:didCreateScene:withTransitionContext:completion:] + 523
24 UIKit 0x000000010c461605 -[UIApplicationSceneClientAgent scene:didInitializeWithEvent:completion:] + 369
25 FrontBoardServices 0x0000000110158cc0 -[FBSSceneImpl _didCreateWithTransitionContext:completion:] + 338
26 FrontBoardServices 0x00000001101617b5 __56-[FBSWorkspace client:handleCreateScene:withCompletion:]_block_invoke_2 + 235
27 libdispatch.dylib 0x000000010f3b733d _dispatch_client_callout + 8
28 libdispatch.dylib 0x000000010f3bc9f3 _dispatch_block_invoke_direct + 592
29 FrontBoardServices 0x000000011018d498 FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK + 24
30 FrontBoardServices 0x000000011018d14e -[FBSSerialQueue _performNext] + 464
31 FrontBoardServices 0x000000011018d6bd -[FBSSerialQueue _performNextFromRunLoopSource] + 45
32 CoreFoundation 0x000000010b9ae101 CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 17
33 CoreFoundation 0x000000010ba4df71 __CFRunLoopDoSource0 + 81
34 CoreFoundation 0x000000010b992a19 __CFRunLoopDoSources0 + 185
35 CoreFoundation 0x000000010b991fff __CFRunLoopRun + 1279
36 CoreFoundation 0x000000010b991889 CFRunLoopRunSpecific + 409
37 GraphicsServices 0x0000000110a219c6 GSEventRunModal + 62
38 UIKit 0x000000010be895d6 UIApplicationMain + 159
39 UITextView 0x000000010a7914df main + 111
40 libdyld.dylib 0x000000010f433d81 start + 1
41 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
