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];
}
