当我运行以下代码时,它会在最后一行崩溃.我不知道为什么这个函数在awakeFromNib中调用.
- - (void)setMotdText:(NSString *)text
- {
- NSString *boldFontName = [[NSFont boldSystemFontOfSize:12] fontName];
- NSMutableAttributedString *attrstr = [[NSMutableAttributedString alloc] initWithString:text];
- [attrstr beginEditing];
- [attrstr addAttribute:NSFontAttributeName value:boldFontName range:NSMakeRange(0,16)];
- [attrstr endEditing];
- [self.motdTextView.textStorage setAttributedString:attrstr];
- }
我得到这个崩溃日志：
- 2012-06-22 11:32:22.348 MSM-Plan[20785:403] -[__NSCFConstantString _isDefaultFace]: unrecognized selector sent to instance 0x7fff79b9f380
- 2012-06-22 11:32:22.349 MSM-Plan[20785:403] An uncaught exception was raised
- 2012-06-22 11:32:22.349 MSM-Plan[20785:403] -[__NSCFConstantString _isDefaultFace]: unrecognized selector sent to instance 0x7fff79b9f380
- 2012-06-22 11:32:22.351 MSM-Plan[20785:403] (
- 0 CoreFoundation 0x00007fff8a5bef56 __exceptionPreprocess + 198
- 1 libobjc.A.dylib 0x00007fff8ae19d5e objc_exception_throw + 43
- 2 CoreFoundation 0x00007fff8a64b1be -[NSObject doesNotRecognizeSelector:] + 190
- 3 CoreFoundation 0x00007fff8a5abe23 ___forwarding___ + 371
- 4 CoreFoundation 0x00007fff8a5abc38 _CF_forwarding_prep_0 + 232
- 5 AppKit 0x00007fff8e0b060c -[NSMutableAttributedString(NSMutableAttributedStringKitAdditions) fixFontAttributeInRange:] + 1249
- 6 AppKit 0x00007fff8e0afeb7 -[NSMutableAttributedString(NSMutableAttributedStringKitAdditions) fixAttributesInRange:] + 64
- 7 AppKit 0x00007fff8e19b521 -[NSTextStorage processEditing] + 107
- 8 AppKit 0x00007fff8e0c2564 -[NSTextStorage edited:range:changeInLength:] + 385
- 9 Foundation 0x00007fff8d6f4497 -[NSConcreteMutableAttributedString replaceCharactersInRange:withAttributedString:] + 328
- 10 AppKit 0x00007fff8e1dfd19 -[NSConcreteTextStorage replaceCharactersInRange:withAttributedString:] + 81
- 11 MSM-Plan 0x000000010206af5a -[MSM_PlanAppDelegate setMotdText:] + 314
- 12 MSM-Plan 0x000000010206c455 -[MSM_PlanAppDelegate awakeFromNib] + 1701
- 13 CoreFoundation 0x00007fff8a5b5fb1 -[NSObject performSelector:] + 49
- 14 CoreFoundation 0x00007fff8a5b5f32 -[NSSet makeObjectsPerformSelector:] + 274
- 15 AppKit 0x00007fff8e0369ff -[NSIBObjectData nibInstantiateWithOwner:topLevelObjects:] + 1245
- 16 AppKit 0x00007fff8e02cf73 loadNib + 322
- 17 AppKit 0x00007fff8e02c470 +[NSBundle(NSNibLoading) _loadNibFile:naMetable:withZone:ownerBundle:] + 217
- 18 AppKit 0x00007fff8e02c38b +[NSBundle(NSNibLoading) loadNibFile:externalNaMetable:withZone:] + 141
- 19 AppKit 0x00007fff8e02c2ce +[NSBundle(NSNibLoading) loadNibNamed:owner:] + 364
- 20 AppKit 0x00007fff8e29d06f NSApplicationMain + 398
- 21 MSM-Plan 0x000000010206adf2 main + 34
- 22 MSM-Plan 0x000000010206adc4 start + 52
- )
- 2012-06-22 11:32:22.416 MSM-Plan[20785:403] *** Terminating app due to uncaught exception 'NSInvalidArgumentException',reason: '-[__NSCFConstantString _isDefaultFace]: unrecognized selector sent to instance 0x7fff79b9f380'
- *** First throw call stack:
- (
- 0 CoreFoundation 0x00007fff8a5bef56 __exceptionPreprocess + 198
- 1 libobjc.A.dylib 0x00007fff8ae19d5e objc_exception_throw + 43
- 2 CoreFoundation 0x00007fff8a64b1be -[NSObject doesNotRecognizeSelector:] + 190
- 3 CoreFoundation 0x00007fff8a5abe23 ___forwarding___ + 371
- 4 CoreFoundation 0x00007fff8a5abc38 _CF_forwarding_prep_0 + 232
- 5 AppKit 0x00007fff8e0b060c -[NSMutableAttributedString(NSMutableAttributedStringKitAdditions) fixFontAttributeInRange:] + 1249
- 6 AppKit 0x00007fff8e0afeb7 -[NSMutableAttributedString(NSMutableAttributedStringKitAdditions) fixAttributesInRange:] + 64
- 7 AppKit 0x00007fff8e19b521 -[NSTextStorage processEditing] + 107
- 8 AppKit 0x00007fff8e0c2564 -[NSTextStorage edited:range:changeInLength:] + 385
- 9 Foundation 0x00007fff8d6f4497 -[NSConcreteMutableAttributedString replaceCharactersInRange:withAttributedString:] + 328
- 10 AppKit 0x00007fff8e1dfd19 -[NSConcreteTextStorage replaceCharactersInRange:withAttributedString:] + 81
- 11 MSM-Plan 0x000000010206af5a -[MSM_PlanAppDelegate setMotdText:] + 314
- 12 MSM-Plan 0x000000010206c455 -[MSM_PlanAppDelegate awakeFromNib] + 1701
- 13 CoreFoundation 0x00007fff8a5b5fb1 -[NSObject performSelector:] + 49
- 14 CoreFoundation 0x00007fff8a5b5f32 -[NSSet makeObjectsPerformSelector:] + 274
- 15 AppKit 0x00007fff8e0369ff -[NSIBObjectData nibInstantiateWithOwner:topLevelObjects:] + 1245
- 16 AppKit 0x00007fff8e02cf73 loadNib + 322
- 17 AppKit 0x00007fff8e02c470 +[NSBundle(NSNibLoading) _loadNibFile:naMetable:withZone:ownerBundle:] + 217
- 18 AppKit 0x00007fff8e02c38b +[NSBundle(NSNibLoading) loadNibFile:externalNaMetable:withZone:] + 141
- 19 AppKit 0x00007fff8e02c2ce +[NSBundle(NSNibLoading) loadNibNamed:owner:] + 364
- 20 AppKit 0x00007fff8e29d06f NSApplicationMain + 398
- 21 MSM-Plan 0x000000010206adf2 main + 34
- 22 MSM-Plan 0x000000010206adc4 start + 52
- )
- terminate called throwing an exception(lldb)
解决方法
我不得不将第一行改为：
- NSFont *boldFont = [NSFont boldSystemFontOfSize:12];
现在它的工作原理是因为value属性需要一个NSFont-Object,而不是带有字体名称的NSString.
这是工作代码：
- - (void)setMotdText:(NSString *)text
- {
- NSFont *boldFont = [NSFont boldSystemFontOfSize:12];
- NSMutableAttributedString *attrstr = [[NSMutableAttributedString alloc] initWithString:text];
- [attrstr beginEditing];
- [attrstr addAttribute:NSFontAttributeName value:boldFont range:NSMakeRange(0,16)];
- [attrstr endEditing];
- [self.motdTextView.textStorage setAttributedString:attrstr];
- }
