切换到另一个窗口时窗口未释放

Question

我正在创建一个 Mac 应用程序，其中有带有一些按钮的主窗口。

当我单击按钮时，它将打开一个带有 NSTableview 的 DetailWindow 。每个 buttonclickevent 都会更改 NSTableView 中的数据。

这是我的代码：

在我的 ma​​inWindow.m 文件中

- (IBAction)btn1Event:(id)sender {
    if (!detailwindow) {
        detailwindow = [[DetailWindow alloc] initWithWindowNibName:@"DetailWindow"];
        detailwindow.mainwindow = self;
    }

    detailwindow.title = @"First";
    [detailwindow showWindow:self];
}

- (IBAction)btn2Event:(id)sender{
    if (!detailwindow) {
        detailwindow = [[DetailWindow alloc] initWithWindowNibName:@"DetailWindow"];
        detailwindow.mainwindow = self;
    }

    detailwindow.title = @"Second";
    [detailwindow showWindow:self];
}

在 DetailWindow 中

- (void)windowDidLoad
{
     [super windowDidLoad];
     [tableView setBackgroundColor:[NSColor clearColor]];
     [tableView setHeaderView:nil];

    if([title isEqualToString:@"First"]){
        [arrayController addObject:[NSDictionary dictionaryWithObjectsAndKeys:[NSImage imageNamed:@"MS.png"],@"image",@"first image",@"text", nil]];
        [arrayController addObject:[NSDictionary dictionaryWithObjectsAndKeys:[NSImage imageNamed:@"CVS.png"],@"image",@"second image",@"text", nil]];
        [arrayController addObject:[NSDictionary dictionaryWithObjectsAndKeys:[NSImage imageNamed:@"NS.png"],@"image",@"first image",@"text", nil]];
        [arrayController addObject:[NSDictionary dictionaryWithObjectsAndKeys:[NSImage imageNamed:@"EM.png"],@"image",@"second image",@"text", nil]];
        [arrayController addObject:[NSDictionary dictionaryWithObjectsAndKeys:[NSImage imageNamed:@"RES.png"],@"image",@"first image",@"text", nil]];
    }

    if ([title isEqualToString:@"Second"]) {
        [arrayController addObject:[NSDictionary dictionaryWithObjectsAndKeys:[NSImage imageNamed:@"RS.png"],@"image",@"second image",@"text", nil]];
        [arrayController addObject:[NSDictionary dictionaryWithObjectsAndKeys:[NSImage imageNamed:@"FB.png"],@"image",@"first image",@"text", nil]] ;
        [arrayController addObject:[NSDictionary dictionaryWithObjectsAndKeys:[NSImage imageNamed:@"GT.png"],@"image",@"second image",@"text", nil]];
        [arrayController addObject:[NSDictionary dictionaryWithObjectsAndKeys:[NSImage imageNamed:@"SKIN.png"],@"image",@"first image",@"text", nil]];
        [arrayController addObject:[NSDictionary dictionaryWithObjectsAndKeys:[NSImage imageNamed:@"GP.png"],@"image",@"second image",@"text", nil]];
    }

    [tableView reloadData];
}

- (IBAction)GoToMainWindow:(id)sender {
    [mainwindow showWindow:self];
}

如果我单击第一个按钮 if([title isEqualToString:@"First"]) 事件调用，我可以在表格视图中看到前五张图像。

之后，如果我单击第二个按钮，我将看不到表中的下五个图像。数据未更改，因为 if ([title isEqualToString:@"Second"]) 未调用此事件。
如果我首先单击第二个按钮，那么第一个事件也会发生同样的情况。

知道为什么吗？我认为当我第二次单击任何按钮时窗口不会释放。

Answer 1

不，那是因为您的插入图像方法位于 -(void)windowDidLoad 方法中，该方法在加载窗口时调用，而不是在调用 showWindow: 方法时调用，因此它只被调用一次。不要在 mainWindow.m 中调用 showWindow: 方法，而是在 DetailWindow 中创建一个新方法，并在单击按钮时调用该方法。

- (IBAction)btn1Event:(id)sender {

if (!detailwindow) {
    detailwindow = [[DetailWindow alloc] initWithWindowNibName:@"DetailWindow"];
    detailwindow.mainwindow = self;

}
detailwindow.title = @"First";
[detailwindow addImageToTableView]; //It doesn't have to be named like that.  Your choice
}

- (IBAction)btn2Event:(id)sender{

if (!detailwindow) {
    detailwindow = [[DetailWindow alloc] initWithWindowNibName:@"DetailWindow"];
    detailwindow.mainwindow = self;
}
detailwindow.title = @"Second";
[detailwindow addImageToTableView];

//DetailWindow

- (void)addImageToTableView
{
 [super windowDidLoad];
 [tableView setBackgroundColor:[NSColor clearColor]];
 [tableView setHeaderView:nil];

if([title isEqualToString:@"First"]){

[arrayController addObject:[NSDictionary dictionaryWithObjectsAndKeys:[NSImage imageNamed:@"MS.png"],@"image",@"first image",@"text", nil]];
[arrayController addObject:[NSDictionary dictionaryWithObjectsAndKeys:[NSImage imageNamed:@"CVS.png"],@"image",@"second image",@"text", nil]];
[arrayController addObject:[NSDictionary dictionaryWithObjectsAndKeys:[NSImage imageNamed:@"NS.png"],@"image",@"first image",@"text", nil]];
[arrayController addObject:[NSDictionary dictionaryWithObjectsAndKeys:[NSImage imageNamed:@"EM.png"],@"image",@"second image",@"text", nil]];
[arrayController addObject:[NSDictionary dictionaryWithObjectsAndKeys:[NSImage imageNamed:@"RES.png"],@"image",@"first image",@"text", nil]];

}

if ([title isEqualToString:@"Second"]) {

[arrayController addObject:[NSDictionary dictionaryWithObjectsAndKeys:[NSImage imageNamed:@"RS.png"],@"image",@"second image",@"text", nil]];
[arrayController addObject:[NSDictionary dictionaryWithObjectsAndKeys:[NSImage imageNamed:@"FB.png"],@"image",@"first image",@"text", nil]] ;
[arrayController addObject:[NSDictionary dictionaryWithObjectsAndKeys:[NSImage imageNamed:@"GT.png"],@"image",@"second image",@"text", nil]];
[arrayController addObject:[NSDictionary dictionaryWithObjectsAndKeys:[NSImage imageNamed:@"SKIN.png"],@"image",@"first image",@"text", nil]];
[arrayController addObject:[NSDictionary dictionaryWithObjectsAndKeys:[NSImage imageNamed:@"GP.png"],@"image",@"second image",@"text", nil]];

}
[tableView reloadData];
}
- (IBAction)GoToMainWindow:(id)sender {

[mainwindow showWindow:self];

}

这绝对不是您应该拥有的最佳代码。只需对上面的代码进行一些更改就足够了。