macos – 如何在NSViewController中调用registerForDraggedTypes？

2023年5月18日 247次阅读

我有一个带有splitview的MainViewController.接下来我有两个viewcontroller来控制splitview中的每个视图.我希望能够在其中一个视图中拖放文件.

但我似乎无法让拖延工作？拖动到视图时文件上没有“加号”,丢弃它也没有做任何事情.

我究竟做错了什么？

首先是这里的MainViewController.m

fileViewController = [[FileViewController alloc] initWithNibName:@"FileViewController" bundle:nil];
terminalViewController = [[TerminalViewController alloc] initWithNibName:@"TerminalViewController" bundle:nil];

[splitView replaceSubview:[[splitView subviews] objectAtIndex:0] with:[fileViewController view]];
[splitView replaceSubview:[[splitView subviews] objectAtIndex:1] with:[terminalViewController view]];

接下来,我的代码来处理FileViewController中的拖动

@dynamic isHighlighted;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        NSLog(@"registering");
        [self.view registerForDraggedTypes:[NSArray arrayWithObjects: NSFilenamesPboardType, nil]];
    }



    return self;
}

- (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender {
    NSLog(@"[%@ %@]", NSStringFromClass([self class]), NSStringFromSelector(_cmd));

    NSPasteboard *pboard = [sender draggingPasteboard];

    if ([[pboard types] containsObject:NSFilenamesPboardType]) {

        NSArray *paths = [pboard propertyListForType:NSFilenamesPboardType];
        for (NSString *path in paths) {
            NSError *error = nil;
            NSString *utiType = [[NSWorkspace sharedWorkspace]
                                 typeOfFile:path error:&error];
            if (![[NSWorkspace sharedWorkspace] 
                  type:utiType conformsToType:(id)kUTTypeFolder]) {

                [self setHighlighted:NO];
                return NSDragOperationNone;
            }
        }
    }
    [self setHighlighted:YES];
    return NSDragOperationEvery;
}

- (void)draggingExited:(id <NSDraggingInfo>)sender {
    [self setHighlighted:NO];
}


- (BOOL)prepareForDragOperation:(id <NSDraggingInfo>)sender  {
    return YES;
}

- (BOOL)performDragOperation:(id <NSDraggingInfo>)sender {
    [self setHighlighted:NO];
    return YES;
}

- (void)concludeDragOperation:(id )sender {
    [self.view setNeedsDisplay:YES];
} // end concludeDragOperation

- (BOOL)isHighlighted {
    return isHighlighted;
}

- (void)setHighlighted:(BOOL)value {
    isHighlighted = value;
    [self.view setNeedsDisplay:YES];
}

- (void)drawRect:(NSRect)frame {
    [self.view drawRect:frame];
    if (isHighlighted) {
        [NSBezierPath setDefaultLineWidth:6.0];
        [[NSColor keyboardFocusIndicatorColor] set];
        [NSBezierPath strokeRect:frame];
    }
}

最佳答案 我似乎没有解决它,因为没有人给我任何答案,我通过制作一个NSView子类并将其添加到我的viewcontroller这样修复它.

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        draggable = [[DragView alloc] initWithFrame:CGRectMake(0, 0, 500, 500)];
        [[self view] addSubview:draggable];
    }

    return self;
}
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