Question

我正在制作一个简单的拖放应用程序，并且在检查时，拖动操作未被注册。我在MainMenu.xib上删除了一个NSView，然后继承了NSView。

DropView.h

#import <Cocoa/Cocoa.h>

@interface DropView : NSView <NSDraggingDestination>
@property (nonatomic, strong) NSImage *image;
@end

DropView.m

#import "DropView.h"

@implementation DropView

- (id)initWithFrame:(NSRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
       [self registerForDraggedTypes: [NSImage imagePasteboardTypes]];
    }
return self;
}

- (NSDragOperation) draggingEntered:(id<NSDraggingInfo>)sender{
if ([NSImage canInitWithPasteboard:[sender draggingPasteboard]] && [sender draggingSourceOperationMask] & NSDragOperationCopy ) {
    return NSDragOperationCopy;
}
return NSDragOperationNone;
}

- (NSDragOperation) draggingUpdated:(id<NSDraggingInfo>)sender{
    NSLog(@"DRAGGING!");
    return NSDragOperationCopy;
}

-(void) draggingEnded:(id<NSDraggingInfo>)sender{
    NSLog(@"ENDED!");
}

-(void) draggingExited:(id<NSDraggingInfo>)sender{
    NSLog(@"EXITED");
}

- (void)drawRect:(NSRect)dirtyRect
{
    [super drawRect:dirtyRect];

    // Drawing code here.
}

@end

当我运行它并尝试删除图像时，光标不会更改为+ signed符号。并且没有记录方法。有什么想法吗？

Answer 1

如果您将图像文件拖到窗口上，（？）那么我认为您需要NSFilenamesPboardType：

    [self registerForDraggedTypes:[NSArray arrayWithObject:NSFilenamesPboardType]];

可可拖放没有注册

1 个答案: