Question

我已经开始了一个小项目来了解NSViewController s。

我有AppController来处理NSOpenPanel。获得电影文件的URL后，我将其传递给NSViewController子类（NNMovieViewController）。我就是这样做的：

-(void)openMovieWithURL:(NSURL *)url {
    NSError *error;

    movie = [[QTMovie alloc] initWithURL:url error:&error];

    [startButton setEnabled:YES];
    [movieView setMovie:movie];
    NSLog(@"button: %@", [startButton isEnabled]?@"YES":@"NO");
    // logs "NO"
    NSLog(@"movie: %@", movie);
    // logs the correct movie object
    NSLog(@"movieView: %@", [movieView movie]);
    // logs "(null)"
}

头文件如下所示：

#import <Cocoa/Cocoa.h>
#import <QTKit/QTKit.h>

@interface NNMovieViewController : NSViewController {
    QTMovie *movie;
    BOOL playing;
    IBOutlet QTMovieView *movieView;
    IBOutlet NSButton *startButton;
}

-(IBAction)clickStart:(id)sender;

-(void)openMovieWithURL:(NSURL*)url;

@end

我缺少什么？我在一个没有NSViewController的项目中完成了整个事情而且它刚刚起作用......

更新

在我收到Kreiri和Parag Bafna的评论之后，我又多了一点，发现当我在我的AppController中调用[movieViewController openMovieWithURL:url];时，奥特莱斯还没有连接起来。

这是我的AppController实现：

#import "AppController.h"

@implementation AppController

@synthesize movieViewController;

- (void)awakeFromNib {
    movieViewController = [[NNMovieViewController alloc] initWithNibName:@"NNMovieViewController" bundle:nil];
    NSView *viewControllerView = [movieViewController view];
    [view addSubview:viewControllerView];
}

- (IBAction)clickOpen:(id)sender {
    NSOpenPanel *dialog = [NSOpenPanel openPanel];

    [dialog setCanChooseFiles:TRUE];
    [dialog setCanChooseDirectories:FALSE];
    [dialog setAllowsMultipleSelection:FALSE];

    [dialog setAllowedFileTypes:[QTMovie movieFileTypes:0]];

    if ([dialog runModal] == NSOKButton) {

        NSURL *movieFileURL = [[dialog URLs] objectAtIndex:0];

        [self openMovie:movieFileURL];
    }
}

- (void)openMovie:(NSURL *)url {
    NSLog(@"startButton: %@", [movieViewController movieView]);
    // logs "null"
    NSLog(@"startButton: %@", [movieViewController startButton]);
    // logs "null"
    NSLog(@"---------------------------------");
    [movieViewController openMovieWithURL:url];
}

@end

Answer 1

是的，傻我。在Interface Builder中，我用错误的对象连接了我的控件。我应该使用了文件的所有者，但是我拖入了NSObject并将其类设置为NNMovieViewController并将小部件连接到它。

NSViewController中的奇怪行为

1 个答案: