Mac application development note

这段时间一直在看Mac开发相关的书籍，相对于iOS来说，市面上写的比较好的数据少之又少，《macOSObjc》算是找到的写的比较好的了，但是大部分都是介绍控件的使用。与之相比的《Learn Objective-C on the Mac》写的很详细，不过只有英文版的，看了之后受益匪浅。

下面是看书时总结的笔记，接下来会持续更新。
1、Mac下获取电脑Application icon、name、bundle url

NSString *path = NSSearchPathForDirectoriesInDomains(NSApplicationDirectory, NSSystemDomainMask, YES).firstObject;
    NSDirectoryEnumerator *enumerator = [[NSFileManager defaultManager] enumeratorAtURL:[NSURL fileURLWithPath:path] includingPropertiesForKeys:@[NSURLLocalizedNameKey, NSURLIsApplicationKey, NSURLEffectiveIconKey] options:NSDirectoryEnumerationSkipsPackageDescendants | NSDirectoryEnumerationSkipsHiddenFiles errorHandler:^BOOL(NSURL * _Nonnull url, NSError * _Nonnull error) {
        if(error) {
            NSLog(@"error: %@", error.description);
        }
        return YES;
    }];
    
    for(NSURL *applicationURL in enumerator) {
        NSImage *applicationImage = nil;
        NSError *error;
        [applicationURL getResourceValue:&applicationImage forKey:NSURLEffectiveIconKey error:&error];
        
        NSString *applicationName;
        [applicationURL getResourceValue:&applicationName forKey:NSURLLocalizedNameKey error:&error];
    
        if(error) {
            NSLog(@"error ---> %@", error.description);
            return;
        }
        
        if(applicationName && applicationImage) {
            ApplicationModel *model = [[ApplicationModel alloc] init];
            model.image = applicationImage;
            model.name = applicationName;
            model.url = applicationURL;
            [self.dataArray addObject:model];
        }
    }
    NSLog(@"array - > %@", self.dataArray);

2、Mac下打开应用程序的代码

[[NSWorkspace sharedWorkspace] openURL:url];

3、获取Mac下所有在运行的app的代码

@property (nonatomic, strong) NSMutableArray *dataArr;

NSArray <NSRunningApplication *> *apps = [[NSWorkspace sharedWorkspace] runningApplications];
for(NSRunningApplication *app in apps) {
    [self.dataArr addObject:app.localizedName];
}
[self.tableView reloadData];

4、监听Mac上所有已经运行的app

  [[[NSWorkspace sharedWorkspace] notificationCenter] addObserver:self selector:@selector(applicationDidRunning:) name:NSWorkspaceDidLaunchApplicationNotification object:nil];

5、kill进程代码

- (void)tableViewDoubleClick:(NSTableView *)tableView {
    NSInteger selectedIndex = [tableView selectedRow];
    ApplicationModel *model = self.dataArr[selectedIndex];
    
    NSAlert *alert = [[NSAlert alloc] init];
    alert.alertStyle = NSAlertStyleWarning;
    alert.messageText = @"温馨提示";
    alert.informativeText = @"确定要杀死该进城吗";
    [alert addButtonWithTitle:@"确定"];
    [alert addButtonWithTitle:@"取消"];
    
    __weak typeof(self) weakSelf = self;
    [alert beginSheetModalForWindow:self.view.window completionHandler:^(NSModalResponse returnCode) {
        if(returnCode == 1000) {
            kill(model.pid, SIGKILL);
            [weakSelf.dataArr removeObject:model];
            [weakSelf.tableView reloadData];
        }
    }];
}

6、NSTableView 双击事件

[self.tableView setDoubleAction:@selector(tableViewDoubleClick:)];

7、长按拖动NSTableViewCell，首先注册tableview

    [self.tableView registerForDraggedTypes:[NSArray arrayWithObject:CustomTableViewCellDrap]];

实现tableview拖动的delegate

- (BOOL)tableView:(NSTableView *)tableView writeRowsWithIndexes:(NSIndexSet *)rowIndexes toPasteboard:(NSPasteboard *)pboard {
    NSData *data = [NSKeyedArchiver archivedDataWithRootObject:rowIndexes];
    [pboard declareTypes:[NSArray arrayWithObject:CustomTableViewCellDrap] owner:self];
    [pboard setData:data forType:CustomTableViewCellDrap];
    self.originIndex = rowIndexes.firstIndex;
    return YES;
}

- (NSDragOperation)tableView:(NSTableView *)tableView validateDrop:(id<NSDraggingInfo>)info proposedRow:(NSInteger)row proposedDropOperation:(NSTableViewDropOperation)dropOperation {
    return NSDragOperationMove;
}

- (BOOL)tableView:(NSTableView *)tableView acceptDrop:(id<NSDraggingInfo>)info row:(NSInteger)row dropOperation:(NSTableViewDropOperation)dropOperation {
    id obj = self.dataArr[self.originIndex];
    [self.dataArr insertObject:obj atIndex:row];
    if(self.originIndex < row) {
        [self.dataArr removeObjectAtIndex:self.originIndex];
    }
    else {
        [self.dataArr removeObjectAtIndex:self.originIndex + 1];
    }
    return YES;
}

8、拖动NSCollectionViewCell，首先注册拖动事件

 [self.collection registerForDraggedTypes:@[NSPasteboardTypeString]];
    [self.collection setDraggingSourceOperationMask:NSDragOperationEvery forLocal:yearMask];
    [self.collection setDraggingSourceOperationMask:NSDragOperationEvery forLocal:NO];

其次实现拖动代理函数

@property (nonatomic, assign) NSIndexPath *currentIndex;
- (void)collectionView:(NSCollectionView *)collectionView draggingSession:(NSDraggingSession *)session willBeginAtPoint:(NSPoint)screenPoint forItemsAtIndexPaths:(NSSet<NSIndexPath *> *)indexPaths {
    self.currentIndex = indexPaths.allObjects.firstObject;
}

- (id<NSPasteboardWriting>)collectionView:(NSCollectionView *)collectionView pasteboardWriterForItemAtIndex:(NSUInteger)index {
    NSPasteboardItem *item = [[NSPasteboardItem alloc] init];
    ApplicationModel *model = self.dataArr[index];
    NSString *indexString = [NSString stringWithFormat:@"%@", model.path];
    [item setString:indexString forType:NSPasteboardTypeString];
    return item;
}

- (BOOL)collectionView:(NSCollectionView *)collectionView acceptDrop:(id<NSDraggingInfo>)draggingInfo index:(NSInteger)index dropOperation:(NSCollectionViewDropOperation)dropOperation {
    return YES;
}

- (NSDragOperation)collectionView:(NSCollectionView *)collectionView validateDrop:(id<NSDraggingInfo>)draggingInfo proposedIndexPath:(NSIndexPath *__autoreleasing  _Nonnull *)proposedDropIndexPath dropOperation:(NSCollectionViewDropOperation *)proposedDropOperation {
    if(*proposedDropOperation == NSCollectionViewDropBefore) {
        *proposedDropOperation = NSCollectionViewDropOn;
        return NSDragOperationNone;
    }
    [collectionView moveItemAtIndexPath:self.currentIndex toIndexPath:*proposedDropIndexPath];
    return NSDragOperationMove;
}