blocks|key|2749892|text|不确定那里发生了什么，但我会尝试这样显示您的NSPanel：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2749893|-(IBAction)openPanel:(id)sender+{
[[NSApplication+sharedApplication]+beginSheet:_myPanel
+++++++++++++++++++++++++++++++modalForWindow:self.window
++++++++++++++++++++++++++++++++modalDelegate:self
+++++++++++++++++++++++++++++++didEndSelector:@selector(sheetDidEnd:returnCode:contextInfo:)
++++++++++++++++++++++++++++++++++contextInfo:nil];|code-block|syntax|javascript|2749894|此外，您还应确保已为您的NSPanel激活了Release+When+Closed复选框。在Interface+Builder中搜索它。|offset|length|style|BOLD|2749895|编辑：你是不是在你的NSPanel上画了什么？设置NSColor还是显示NSImage？我的猜测是，您正在显示一个NSImage，并弄乱了一些与此相关的东西：Apple+Doc:+lockFocus|2749896|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/library/mac/documentation/Cocoa/Reference/ApplicationKit/Classes/NSImage_Class/index.html#//apple_ref/occ/instm/NSImage/lockFocus^0|0|0|M|J|0|0|2|27|K|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@$I|Z|J|10|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|11|8|@$I|12|J|13|K|L]]|9|@$I|14|J|15|1|16]]|A|$]]|$1|O|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

Not sure what is going on there but I would try this to show your NSPanel:

<pre><code>-(IBAction)openPanel:(id)sender {
[[NSApplication sharedApplication] beginSheet:_myPanel
 modalForWindow:self.window
 modalDelegate:self
 didEndSelector:@selector(sheetDidEnd:returnCode:contextInfo:)
 contextInfo:nil];
</code></pre>

Also you should make sure that Release When Closed checkbox is activated for your NSPanel.
Search for it in the Interface Builder.

EDIT: Are you drawing something on your NSPanel ? Setting a NSColor or showing a NSImage ? 
My guess is that you are displaying a NSImage and messed something up concerning this: <a href="https://developer.apple.com/library/mac/documentation/Cocoa/Reference/ApplicationKit/Classes/NSImage_Class/index.html#//apple_ref/occ/instm/NSImage/lockFocus" rel="nofollow">Apple Doc: lockFocus</a>

blocks|key|434121|text|我用下面的代码修复了同样的问题|type|unstyled|depth|inlineStyleRanges|entityRanges|data|434122|标头中的|434123|@interface+aWindowController+:+NSWindowController
{
++++/*+other+Vars+*/

++++NSOpenPanel+*panel;
}|code-block|syntax|javascript|434124|.m中的|offset|length|style|BOLD|434125|-+(void)windowDidLoad+{
++++[super+windowDidLoad];

++++/*+other+stuff+*/

++++/*+set+Panel+Properties+*/
++++panel+=+[NSOpenPanel+openPanel];

++++[panel+setCanChooseDirectories:YES];
++++[panel+setCanChooseFiles:NO];
++++[panel+setAllowsMultipleSelection:YES];
}|434126|NSButton+IBACTION中的|434127|-+(IBAction)getFiles:(id)sender
{
++++NSArray+*resultArry;

++++if([panel+runModal]+==+NSFileHandlingPanelOKButton+){
++++++++resultArry+=+[panel+URLs];
++++++++return+resultArry;
++++}

++++return+nil;
}|434128|ARC将清理面板。|434129|entityMap^0|0|0|0|0|2|0|0|0|H|0|0|0|9|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|11|8|@$K|12|L|13|M|N]]|9|@]|A|$]]|$1|O|3|P|5|F|7|14|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|15|8|@$K|16|L|17|M|N]]|9|@]|A|$]]|$1|S|3|T|5|F|7|18|8|@]|9|@]|A|$G|H]]|$1|U|3|V|5|6|7|19|8|@$K|1A|L|1B|M|N]]|9|@]|A|$]]|$1|W|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]]|X|$]]

I have fixed the same problem with the following

In Header

<pre><code>@interface aWindowController : NSWindowController
{
 /* other Vars */

 NSOpenPanel *panel;
}
</code></pre>

In .m

<pre><code>- (void)windowDidLoad {
 [super windowDidLoad];

 /* other stuff */

 /* set Panel Properties */
 panel = [NSOpenPanel openPanel];

 [panel setCanChooseDirectories:YES];
 [panel setCanChooseFiles:NO];
 [panel setAllowsMultipleSelection:YES];
}
</code></pre>

in NSButton IBACTION

<pre><code>- (IBAction)getFiles:(id)sender
{
 NSArray *resultArry;

 if([panel runModal] == NSFileHandlingPanelOKButton ){
 resultArry = [panel URLs];
 return resultArry;
 }

 return nil;
}
</code></pre>

ARC will clean up the panel.

blocks|key|4215647|text|我使用XCode+7.0+beta+6使用故事板和段来显示工作表时也遇到了同样的问题。这似乎是一些常见的问题，如果您直接从操作打开面板。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4215648|要解决这个问题，只需从主队列中打开面板：|4215649|-+(IBAction)openPanel:(id)sender+{
++++dispatch_async(dispatch_get_main_queue(),+%5E{
++++++++[_myPanel+makeKeyAndOrderFront:nil];
++++});
}|code-block|syntax|javascript|4215650|这也将解决来自swift和storyboards的类似问题。使用此快速代码调用segue：|4215651|@IBAction+func+onButtonClicked(sender:+AnyObject)+{
++++dispatch_async(dispatch_get_main_queue(),+{
++++++++self.performSegueWithIdentifier("identifier",+sender:+self);
++++})
}|4215652|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I had the same problem using XCode 7.0 beta 6 using storyboards and a segue to display a sheet. It seems some common problem which happens if you open the panel directly from the action.

To solve the problem, just open the panel from the main queue:

<pre><code>- (IBAction)openPanel:(id)sender {
 dispatch_async(dispatch_get_main_queue(), ^{
 [_myPanel makeKeyAndOrderFront:nil];
 });
}
</code></pre>

This will also solve similar problems from swift and storyboards. Use this swift code to call a segue:

<pre><code>@IBAction func onButtonClicked(sender: AnyObject) {
 dispatch_async(dispatch_get_main_queue(), {
 self.performSegueWithIdentifier("identifier", sender: self);
 })
}
</code></pre>

blocks|key|434211|text|我用一个叫做Segue的NSPopUpButton也遇到了同样的问题，@Flovdis+answer对我也起作用了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|434212|这是我使用的Objective+C代码：|434213|dispatch_async(dispatch_get_main_queue(),+%5E{
++++++++[self+performSegueWithIdentifier:@"MySegue"+sender:self];
++++});|code-block|syntax|javascript|434214|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I had the same problem with a NSPopUpButton that called a Segue and @Flovdis answer worked for me.

This is the Objective C code I used:

<pre><code>dispatch_async(dispatch_get_main_queue(), ^{
 [self performSegueWithIdentifier:@"MySegue" sender:self];
 });
</code></pre>

I click on a <code>NSButton (openPane</code>l) which is located on the main window of my OS X app to show a <code>NSPanel (myPanel</code>) using the following method:

<pre><code>- (IBAction)openPanel:(id)sender {
 [_myPanel makeKeyAndOrderFront:nil];
}
</code></pre>

Everything works as expected except I get the following description in the debug area only the first time I click on the button (openPanel):

<pre><code>"unlockFocus called too many times. Called on NSButton: 0x610000141080."
</code></pre>

The attributes of the Panel are selected as follows:

<pre><code>Style: Utility Panel, 
Appearance:Title Bar and Shadow, 
Controls: Close, 
Behaviour: Restorable, 
Memory: Deferred
</code></pre>

I have looked through the web but can not find any explanation. Does anyone know why this happens or how to resolve it?

unlockFocus called too many times

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我点击位于我的OS X应用程序主窗口的NSButton (openPane，使用以下方法显示一个NSPanel (myPanel)：- (IBAction)openPanel:(id)sender {    [_myPanel makeKeyAndOrderFront:nil];}除了我第一次单击该按钮(OpenPan...

问unlockFocus调用次数过多
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问unlockFocus调用次数过多EN