当我运行以下代码时，它在最后一行崩溃。我不知道为什么。此函数在 awakeFromNib 中被调用。
- (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)
有人有想法吗？如果我用 NSAttributedString-Object 调用它，就没有错误。
最佳答案
我必须将第一行更改为:
NSFont *boldFont = [NSFont boldSystemFontOfSize:12];
现在它可以工作了，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];
}
关于objective-c - 为什么 [NSTextStorage setAttributedString] 与 NSMutableAttributedString 崩溃？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/11153810/