如何获取文本的当前颜色属性?

时间:2015-02-10 04:39:52

标签: objective-c cocoa nscolorwell

我的可编辑NSTextView中有文字。在那里,我添加了一个颜色框(NSColorWell),以更改我的文本的颜色。现在我想获得正在编辑的文本的当前颜色。在我的textDidChange:(from NSTextViewDelegate`)中更改我当前拥有的颜色:

NSColor *currentColor = [self.doc.textStorage attribute:NSForegroundColorAttributeName atIndex:(self.doc.selectedRange.location) effectiveRange:nil];
[self.colorBox setColor:currentColor];

colorBoxNSColorWelldocNSTextView。我使用相同的代码获取当前字体,将NSForegroundColorAttributeName替换为NSFontAttributeName。我总是在我的NSLog区域中遇到一些例外情况,其中大部分是我无法理解的,但无论如何我都会添加它:

2015-02-09 20:35:30.413 MPO Word[851:303] Exception detected while handling key input.
2015-02-09 20:35:30.414 MPO Word[851:303] *** -[NSConcreteTextStorage attribute:atIndex:effectiveRange:]: Range or index out of bounds
2015-02-09 20:35:30.418 MPO Word[851:303] (
    0   CoreFoundation                      0x00007fff8913ef56 __exceptionPreprocess + 198
    1   libobjc.A.dylib                     0x00007fff8dc18d5e objc_exception_throw + 43
    2   CoreFoundation                      0x00007fff8913ed8a +[NSException raise:format:arguments:] + 106
    3   CoreFoundation                      0x00007fff8913ed14 +[NSException raise:format:] + 116
    4   AppKit                              0x00007fff8597d777 -[NSConcreteTextStorage attribute:atIndex:effectiveRange:] + 130
    5   MPO Word                            0x0000000100001541 -[MPODocument textDidChange:] + 625
    6   Foundation                          0x00007fff8c8c5d0e __-[NSNotificationCenter addObserver:selector:name:object:]_block_invoke_1 + 47
    7   CoreFoundation                      0x00007fff890e77ba _CFXNotificationPost + 2634
    8   Foundation                          0x00007fff8c8b1fc3 -[NSNotificationCenter postNotificationName:object:userInfo:] + 65
    9   AppKit                              0x00007fff85e360c6 -[NSTextView(NSSharing) didChangeText] + 348
    10  AppKit                              0x00007fff85e0221f -[NSTextView insertText:replacementRange:] + 2029
    11  AppKit                              0x00007fff85c5d104 -[NSKeyBindingManager(NSKeyBindingManager_MultiClients) flushTextForClient:] + 187
    12  AppKit                              0x00007fff85fb3413 -[NSTextInputContext handleEvent:] + 848
    13  AppKit                              0x00007fff85e7cfcc -[NSView interpretKeyEvents:] + 248
    14  AppKit                              0x00007fff85df5bf9 -[NSTextView keyDown:] + 691
    15  AppKit                              0x00007fff858d30fc -[NSWindow sendEvent:] + 7430
    16  AppKit                              0x00007fff8586c3a5 -[NSApplication sendEvent:] + 5593
    17  AppKit                              0x00007fff85802a0e -[NSApplication run] + 555
    18  AppKit                              0x00007fff85a7eeac NSApplicationMain + 867
    19  MPO Word                            0x0000000100001092 main + 34
    20  MPO Word                            0x0000000100001064 start + 52
    21  ???                                 0x0000000000000003 0x0 + 3
)

此外,颜色很好地点击,保持按下状态,直到再次点击,所有颜色消失。如何在没有这些错误的情况下获得颜色?

1 个答案:

答案 0 :(得分:0)

我的猜测是,有效范围不能为空。

尝试类似

的内容
NSRange effectiveRange = NSMakeRange(0, 1);

NSColor *currentColor = [self.doc.textStorage attribute:NSForegroundColorAttributeName atIndex:(self.doc.selectedRange.location) effectiveRange:&effectiveRange];