xcode Cocoa/Obj-C - 将文件拖到应用程序图标时打开文件

Cocoa/Obj-C - Open file when dragging it to application icon

提问by Nono

Currently there is a button on my app inteface which allow to open a file, here is my open code:

目前我的应用程序界面上有一个按钮可以打开文件，这是我的打开代码：

In my app.h:

在我的 app.h 中：

- (IBAction)selectFile:(id)sender;

In my app.m:

在我的 app.m 中：

@synthesize window;

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {

}

- (IBAction)selectFile:(id)sender {

    NSOpenPanel *openPanel  = [NSOpenPanel openPanel];
    NSArray *fileTypes = [NSArray arrayWithObjects:@"xml",nil];

    NSInteger result  = [openPanel runModalForDirectory:NSHomeDirectory() file:nil types:fileTypes ];

    if(result == NSOKButton){

        NSString * input =  [openPanel filename];

How can I edit my code to allow opening with the application-icon drag & drop?
Note: I edited the .plist file and added a line for "xml" but it change anything, got an error when my file is dropped on the icon.
Note 2: I linked the "File -> Open..." to the selectFile: wich refer to my code
Note 3: My app isn't a document-based application

如何编辑我的代码以允许使用应用程序图标拖放打开？
注意：我编辑了 .plist 文件并为“xml”添加了一行，但它更改了任何内容，当我的文件放在图标上时出错。
注 2：我将“文件 -> 打开...”链接到了选择文件：至极指的是我的代码
注 3：我的应用程序不是基于文档的应用程序

Thanks for your help!
Miskia

谢谢你的帮助！
米斯基亚

回答by Anne

First add the proper extensions to CFBundleDocumentTypes inside the .plist file.

首先将适当的扩展名添加到 .plist 文件中的 CFBundleDocumentTypes。

Next implement the following delegates:
- application:openFile: (one file dropped)
- application:openFiles: (multiple files dropped)

接下来实现以下委托：
- application:openFile:（删除一个文件）
- application:openFiles:（删除多个文件）

Reference:
NSApplicationDelegate Protocol Reference

参考：
NSApplicationDelegate 协议参考

Response to comment:

回复评论：

Step by step example, hopefully it makes everything clear :)

一步一步的例子，希望它能让一切都清楚:)

Add to the .plist file:

添加到 .plist 文件：

 <key>CFBundleDocumentTypes</key>
        <array>
            <dict>
                <key>CFBundleTypeExtensions</key>
                <array>
                    <string>xml</string>
                </array>
                <key>CFBundleTypeIconFile</key>
                <string>application.icns</string>
                <key>CFBundleTypeMIMETypes</key>
                <array>
                    <string>text/xml</string>
                </array>
                <key>CFBundleTypeName</key>
                <string>XML File</string>
                <key>CFBundleTypeRole</key>
                <string>Viewer</string>
                <key>LSIsAppleDefaultForType</key>
                <true/>
            </dict>
        </array>

Add to ...AppDelegate.h

添加到...AppDelegate.h

- (BOOL)processFile:(NSString *)file;
- (IBAction)openFileManually:(id)sender;

Add to ...AppDelegate.m

添加到 ...AppDelegate.m

- (IBAction)openFileManually:(id)sender;
{
    NSOpenPanel *openPanel  = [NSOpenPanel openPanel];
    NSArray *fileTypes = [NSArray arrayWithObjects:@"xml",nil];
    NSInteger result  = [openPanel runModalForDirectory:NSHomeDirectory() file:nil types:fileTypes ];
    if(result == NSOKButton){
        [self processFile:[openPanel filename]];
    }
}

- (BOOL)application:(NSApplication *)theApplication openFile:(NSString *)filename
{
    return [self processFile:filename];
}

- (BOOL)processFile:(NSString *)file
{
    NSLog(@"The following file has been dropped or selected: %@",file);
    // Process file here
    return  YES; // Return YES when file processed succesfull, else return NO.
}

回答by ingconti

for a quick&dirty solution:

快速而肮脏的解决方案：

Cocoa: Drag and Drop any file type

Cocoa：拖放任何文件类型

Tested under Xcode Version 11.4 (11E146) catalina 10.15.4 (19E266)

在 Xcode 版本 11.4 (11E146) catalina 10.15.4 (19E266) 下测试