在NSPopover中使用NSNumberFormatter

Question

在NSPopover中使用NSNumberFormatter

cho*_*rry 13 cocoa nsformatter nspopover paintcode

有没有办法让NSNumberFormatter(或者可能是任何其他NSFormatter)在NSPopover中工作？

弹出窗口中的NSTextField值绑定到NSViewController的representObject.当在字段中输入无效数字(例如,"asdf")时,在NSWindow中会显示一个表示该值无效的表格,其中包含呈现弹出窗口的NSView.

单击"确定"后,您将获得以下回溯:

* thread #1: tid = 0x4e666a, 0x00007fff931f9097 libobjc.A.dylib`objc_msgSend + 23, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=EXC_I386_GPFLT)
frame #0: 0x00007fff931f9097 libobjc.A.dylib`objc_msgSend + 23
frame #1: 0x00007fff8a1fa6c8 AppKit`-[NSTextView(NSSharing) becomeKeyWindow] + 106
frame #2: 0x00007fff8a080941 AppKit`-[NSWindow(NSWindow_Theme) acquireKeyAppearance] + 207
frame #3: 0x00007fff8a0800df AppKit`-[NSWindow becomeKeyWindow] + 1420
frame #4: 0x00007fff8a07f5c6 AppKit`-[NSWindow _changeKeyAndMainLimitedOK:] + 803
frame #5: 0x00007fff8a1a205d AppKit`-[NSWindow _orderOutAndCalcKeyWithCounter:stillVisible:docWindow:] + 1156
frame #6: 0x00007fff8a0876c5 AppKit`-[NSWindow _reallyDoOrderWindow:relativeTo:findKey:forCounter:force:isModal:] + 3123
frame #7: 0x00007fff8a0867f0 AppKit`-[NSWindow _doOrderWindow:relativeTo:findKey:forCounter:force:isModal:] + 786
frame #8: 0x00007fff8a086470 AppKit`-[NSWindow orderWindow:relativeTo:] + 162
frame #9: 0x00007fff8a1a1425 AppKit`__18-[NSWindow _close]_block_invoke + 443
frame #10: 0x00007fff8a1a1230 AppKit`-[NSWindow _close] + 370
frame #11: 0x00007fff8a2d0565 AppKit`__106-[NSApplication(NSErrorPresentation) presentError:modalForWindow:delegate:didPresentSelector:contextInfo:]_block_invoke3221 + 50
frame #12: 0x00007fff8a2d02f7 AppKit`-[NSApplication(NSErrorPresentation) _something:wasPresentedWithResult:soContinue:] + 18
frame #13: 0x00007fff8a28fe9d AppKit`-[NSAlert didEndAlert:returnCode:contextInfo:] + 90
frame #14: 0x00007fff8a28f8c2 AppKit`-[NSWindow endSheet:returnCode:] + 368
frame #15: 0x00007fff8a28f49d AppKit`-[NSAlert buttonPressed:] + 107
frame #16: 0x00007fff8a1543d0 AppKit`-[NSApplication sendAction:to:from:] + 327
frame #17: 0x00007fff8a15424e AppKit`-[NSControl sendAction:to:] + 86
frame #18: 0x00007fff8a1a0d7d AppKit`-[NSCell _sendActionFrom:] + 128
frame #19: 0x00007fff8a1ba715 AppKit`-[NSCell trackMouse:inRect:ofView:untilMouseUp:] + 2316
frame #20: 0x00007fff8a1b9ae7 AppKit`-[NSButtonCell trackMouse:inRect:ofView:untilMouseUp:] + 487
frame #21: 0x00007fff8a1b91fd AppKit`-[NSControl mouseDown:] + 706
frame #22: 0x00007fff8a13ad08 AppKit`-[NSWindow sendEvent:] + 11296
frame #23: 0x00007fff8a0d9744 AppKit`-[NSApplication sendEvent:] + 2021
frame #24: 0x00007fff89f29a29 AppKit`-[NSApplication run] + 646
frame #25: 0x00007fff89f14803 AppKit`NSApplicationMain + 940

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objc_msgSend崩溃时的寄存器是:

(lldb) reg read
General Purpose Registers:
   rax = 0x0000610000190740
   rbx = 0x0000610000190740
   rcx = 0x0000000000000080
   rdx = 0x00007fff8a97fd93  "currentEditor"
   rdi = 0x0000610000190740
   rsi = 0x00007fff8a9612bf  "respondsToSelector:"
   rbp = 0x00007fff5fbfeae0
   rsp = 0x00007fff5fbfeab8
    r8 = 0x000000000000002e
    r9 = 0xffff9fffffeb1bbf
   r10 = 0x00007fff8a9612bf  "respondsToSelector:"
   r11 = 0xbaddbe5c3e96bead
   r12 = 0x0000610000053830
   r13 = 0x00007fff931f9080  libobjc.A.dylib`objc_msgSend
   r14 = 0x000060000012a500
   r15 = 0x00007fff931f9080  libobjc.A.dylib`objc_msgSend
   rip = 0x00007fff931f9097  libobjc.A.dylib`objc_msgSend + 23
rflags = 0x0000000000010246
    cs = 0x000000000000002b
    fs = 0x0000000000000000
    gs = 0x00000000c0100000

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我猜这是因为在显示工作表之后瞬态弹出框的窗口消失了,当前编辑器和任何可以响应选择器的对象也是如此.

将弹出窗口行为设置为NSPopoverBehaviorSemitransient会有所帮助,但如果弹出窗口在文本字段中被忽略并且值无效,则仍会抛出异常.

此时,我所能想到的就是避免这个问题是手动验证数值.呸.

更新1

正如Brian Webster在下面发现的,这是AppKit的一个基本问题.

由于我的验证需求非常简单(只是正整数),解决方法是在KVC对象中进行手动验证,该对象用作NSPopover显示的NSViewController中的representObject.由于NSTextField 确实想要使用字符串值,因此-valueForKey:和-setValue:forKey:用于转换标量值.当您为文本字段中的绑定值启用"立即验证"时,将在文本字段更改时随时调用验证方法.

(在你问之前,NSValueTransformer不能完成这项工作,因为它没有参与验证过程.只有在填充字段或保存更改时才会调用它.我想在用户输入一些无效后立即收到反馈数据 - 正如NSFormatter所做的那样.)

这是我所做的要点:

- (id)valueForKey:(NSString *)key
{
    if ([key isEqualToString:@"property1"]) {
        return [NSString stringWithFormat:@"%zd", _property1];
    }
    else if ([key isEqualToString:@"property2"]) {
        return [NSString stringWithFormat:@"%zd", _property2];
    }
    else {
        return [super valueForKey:key];
    }
}


- (BOOL)validateValue:(inout id *)ioValue forKey:(NSString *)inKey error:(out NSError **)outError
{
    if (! *ioValue) {
        *ioValue = @"0";
    }
    else if ([*ioValue isKindOfClass:[NSString class]]) {
        NSString *inputString = [[(NSString *)*ioValue copy] autorelease];
        inputString = [inputString stringByReplacingOccurrencesOfString:@"," withString:@""];
        NSInteger integerValue = [inputString integerValue];
        if (integerValue < 0) {
            integerValue = -integerValue;
        }
        *ioValue = [NSString stringWithFormat:@"%zd", integerValue];
    }

    return YES;
}

- (void)setValue:(id)value forKey:(NSString *)key
{
    if ([value isKindOfClass:[NSString class]]) {
        if ([key isEqualToString:@"property1"]) {
            _property1 = [value integerValue];
        }
        else if ([key isEqualToString:@"property2"]) {
            _property2 = [value integerValue];
        }
        else {
            [super setValue:value forKey:key];
        }
    }
    else {
        [super setValue:value forKey:key];
    }
}

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现在我需要洗个澡.

更新2

感谢@PixelCutCompany提供的关于他们如何在PaintCode应用程序中执行操作的一些有用提示:

https://twitter.com/PixelCutCompany/status/441695942774104064 https://twitter.com/PixelCutCompany/status/441696198140125184

我想出了这个:

@interface PopupNumberFormatter : NSNumberFormatter

@end

@implementation PopupNumberFormatter

- (BOOL)getObjectValue:(out id *)anObject forString:(NSString *)aString range:(inout NSRange *)rangep error:(out NSError **)error
{
    NSNumber *minimum = [self minimum];
    NSNumber *maximum = [self maximum];

    if (aString == nil || [aString length] == 0) {
        if (minimum) {
            *anObject = minimum;
        }
        else if (maximum) {
            *anObject = maximum;
        }
        else {
            *anObject = [NSNumber numberWithInteger:0];
        }
    }
    else {
    if (! [super getObjectValue:anObject forString:aString range:rangep error:nil]) {
        // if the superclass can't parse the string, assign a reasonable default
        if (minimum) {
            *anObject = minimum;
        }
        else if (maximum) {
            *anObject = maximum;
        }
        else {
            *anObject = [NSNumber numberWithInteger:0];
        }
    }
    else {
        // clamp the parsed value to a minimum and maximum (if set)
        if (minimum && [*anObject compare:minimum] == NSOrderedAscending) {
            *anObject = minimum;
        }
        else if (maximum && [*anObject compare:maximum] == NSOrderedDescending) {
            *anObject = maximum;
        }
    }
    }

    return YES;
}

@end

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基本上,您可以通过始终提供有效值来避免工作表或对话框的问题.上面的代码在分配默认值时会考虑最小值和最大值.子类还考虑了nil或空字符串以及钳位值.

这让我感觉不那么脏.

Answer 1

Bri*_*ter 11

我建立了一个测试项目,看看我是否可以重现这个,我也有同样的行为.这似乎是事件的顺序:

当您在文本字段中按Enter键时,会触发绑定,该绑定会尝试通过该字段验证字段中的值NSNumberFormatter.
当它失败时,绑定系统NSError通过响应者链呈现对象.这会冒泡NSApplication,将错误显示为窗口上的工作表.
工作表的外观触发弹出窗口关闭,然后再次触发相同的绑定,这会尝试显示另一个错误.但是,由于窗口上已经显示了一个工作表,因此永远不会显示第二个错误.如果更改绑定选项并启用"始终显示应用程序模式警报"(将在单独的窗口而不是工作表中显示错误),您将看到两个单独的警报窗口显示.

我认为这是错误 - 错误 - 错误导致AppKit循环播放,并且当它试图弄乱字段编辑器(这是NSTextView堆栈跟踪中)的某个地方时,它最终消息传递现在解除分配NSTextField.

我发现最好的解决方法是-willPresentError:在NSViewController子类中实现我用来控制弹出窗口,如下所示:

- (NSError *)willPresentError:(NSError *)error
{
    NSMutableDictionary* userInfo = [[error userInfo] mutableCopy];

    [self.numberTextField unbind:@"value"];
    [userInfo setValue:nil forKey:NSRecoveryAttempterErrorKey];
    [userInfo setValue:nil forKey:NSLocalizedRecoveryOptionsErrorKey];
    return [NSError errorWithDomain:[error domain] code:[error code] userInfo:userInfo];
}

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该unbind:调用将删除绑定,以便在弹出窗口关闭时它不会尝试重新验证文本字段.因为无论如何都会在显示错误时弹出窗口消失,所以这不应该有任何不良影响,假设您每次显示时都从头开始创建弹出窗口而不重复使用它.

此外,由于"OK"和"Discard Change"按钮在他们所指的字段消失后不再有意义,我将错误从绑定系统的恢复尝试器中删除,然后再将其传递给AppKit进行显示.这样,它只是说"值X无效","OK"按钮除了关闭错误窗口外什么都不做.

请注意,这仅在绑定上启用"始终存在应用程序模式警报"时才有效.否则,该willPresentError:方法似乎不会被AppKit调用,如果它将作为工作表显示错误,至少不在视图控制器上.您可能能够在响应程序链中的其他位置插入逻辑,例如主窗口的控制器,如果您想保持工作表行为.

我会留给你来决定这是否比手动验证值更难或更难看.:)

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