4

我有一个 MainViewController，里面有一个 splitview。接下来我有两个视图控制器来控制拆分视图中的每个视图。我希望能够在其中一个视图中拖放文件。

但我似乎无法让拖动工作？将文件拖到视图并放下它时，文件上没有“加号”，也不会做任何事情。

我究竟做错了什么？

首先是 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，我处理 FileViewController 中的拖动的代码

@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];
    }
}
4

2 回答 2

2

我似乎没有修复它，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视图控制器中来修复它。

- (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;
}
于 2011-11-22T13:19:19.657 回答
0

我从未做过 OS X 编程，但问题是，由于您正在注册self.view 接收拖放操作，因此您self.view应该处理拖放操作而不是视图控制器。所以你在子类化NSView到是正确的DragView，你应该将拖动操作传递回视图控制器。

另外，我认为- (NSDragOperation)draggingUpdated:(id<NSDraggingInfo>)sender应该实施。

于 2013-12-11T05:42:24.117 回答