NSCollectionView 不会工作

Question

我对 NSCollectionView 有疑问。根据这个手册（https://www.youtube.com/watch?v=dw-sHMTsMVs），这在我看来很简单。

我创建了 NSCollectionView、NSArrayController，我绑定了 NSMuttableArray * todoList 并设置了 Todo class。我加入 ViewController 与 IBAOutlet NSArrayController。一切似乎都很好，但是当我调用 [arrayController addobject: todo] 时，它会抛出异常。看。图片.

ViewController.h:

#import <Cocoa/Cocoa.h>

@interface ViewController : NSViewController{
    IBOutlet NSArrayController *todoArrayController;
}
@property NSMutableArray *todoList;
@property IBOutlet NSImageView *logo;

@end

ViewController.m:

#import "ViewController.h"
#import "Db.h"
#import "TodoManager.h"

@interface NSURL (NSObject)
+(id)URLWithLocalDatabase:(NSString* )database username:(NSString* )username params:(NSDictionary* )params;
+(id)URLWithHost:(NSString* )host ssl:(BOOL)ssl username:(NSString* )username database:(NSString* )database  params:(NSDictionary* )params;
+(id)URLWithHost:(NSString* )host port:(NSUInteger)port ssl:(BOOL)ssl username:(NSString* )username database:(NSString* )database params:(NSDictionary* )params;
@end

@implementation ViewController
@synthesize logo;
@synthesize todoList = _todoList;
const int WINDOW_WIDTH = 300;
TodoManager* todoManager;

- (void)awakeFromNib{
    Todo *todo = [[Todo alloc]init];
    todo.name = @"Shit";
    _todoList = [[NSMutableArray alloc]init];
    [todoArrayController addObject:todo];

}

- (void)viewDidLoad {
    todoManager = [[TodoManager alloc] init];
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}

- (void)setRepresentedObject:(id)representedObject {
    [super setRepresentedObject:representedObject];
    // Update the view, if already loaded.
}

- (void)notifikace:(id)sender{
    NSUserNotification *notification = [NSUserNotification alloc];
    notification.title = @"Kurva to je dobry";
    notification.informativeText = @"TOTO je kurvesky dobrej text";
    notification.soundName = NSUserNotificationDefaultSoundName;
    [[NSUserNotificationCenter defaultUserNotificationCenter] deliverNotification:notification];
}

- (void)viewDidAppear{
    //Nastaveni rozmeru a pozici okna
    NSRect rozmery = NSMakeRect([[NSScreen mainScreen] frame].size.width - WINDOW_WIDTH, 0, WINDOW_WIDTH, [[NSScreen mainScreen] frame].size.height);
    [self.view.window setFrame:rozmery display:true];


    //Nastaveni pozadi okna
    [self.view.window setBackgroundColor:[NSColor whiteColor]];
    //Vždy top
    [self.view.window setLevel:NSFloatingWindowLevel];

    //Nastaveni loga
    NSImage *image = [[NSImage alloc] initWithContentsOfFile:@"/Users/jasin/Documents/XcodeProjects/TestProjekt/TestProjekt/logo.png"];
    [self.logo setImage: image];

}
@end

布局和连接：http://www.jumina.cz/shot1.png

Answer 1

请不要使用图像作为信息，例如主要是文本的异常日志。

无论如何，例外是"NSCollectionView item prototype must not be nil"。因此，您忽略了将集合视图的 itemPrototype 出口连接到 NIB 中 NSCollectionViewItem 的实例。当您将集合视图拖入 NIB 时，IB 会创建集合视图项目原型并为您连接插座，因此您可能删除了项目 and/or 自己断开了插座。如果是这样，你不应该。

NSCollectionView 不会工作

NSCollectionView won't work

cocoa

objective-c

cocoa-bindings