自定义 NSView 更改背景颜色时崩溃

发布于 2024-11-19 02:53:20 字数 936 浏览 1 评论 0原文

我有一个自定义 NSView 对象，带有一个名为 bgColor 的保留属性。我通过定义 setBgColor 方法来覆盖 setter 方法：

- (void)setBgColor:(NSColor *)theColor
{
    [bgColor autorelease];
    bgColor = [theColor retain];
    [self setNeedsDisplay:YES];
}

我还有另一个名为 isOnline 的函数：

-(void)isOnline:(BOOL)connected{
    if(connected){
        self.bgColor = onlineBackgroundColor;
    } else {
        self.bgColor = offlineBackgroundColor;
    }
}

当我使用 [self isOnline:NO] 在 initWithFrame 方法中调用 isOnline 方法时，它工作正常。但是，当我尝试使用以下命令从控制对象调用 isOnline 方法时：

[theCustomedView isOnline:YES]; 或 theCustomedView.isOnline = YES;

它会在 setBgColor 方法中崩溃该行：bgColor = [theColor keep];编译器抱怨程序收到信号：“EX_BAD_ACCESS”。我不明白为什么。那自动释放是错误的吗？

如果是这样，我为什么可以从控制对象 [theCustomedView setBgColor:aColor]; 以及 initWithFrame 中的 self 进行调用，并且它可以正常工作？

有什么想法吗？

原文

I have a custom NSView object with a retained property named bgColor. I override the setter method by defining setBgColor method:

- (void)setBgColor:(NSColor *)theColor
{
    [bgColor autorelease];
    bgColor = [theColor retain];
    [self setNeedsDisplay:YES];
}

I also have another function called isOnline:

-(void)isOnline:(BOOL)connected{
    if(connected){
        self.bgColor = onlineBackgroundColor;
    } else {
        self.bgColor = offlineBackgroundColor;
    }
}

When I called the isOnline method in initWithFrame method using [self isOnline:NO], it works fine. But when I try to call isOnline method from a controlling object with:

[theCustomedView isOnline:YES]; or theCustomedView.isOnline = YES;

It would crash in the setBgColor method at the line: bgColor = [theColor retain]; The complier complains Program received signal: "EX_BAD_ACCESS". I can't figure out why. Was that autorelease wrong?

If so, how come I can call from the controlling object [theCustomedView setBgColor:aColor]; and from self in the initWithFrame and it would work fine?

Any ideas?

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