OS X上Cocoa的NSPageController教程

Question

我需要在某个项目中使用NSPageController，但我不知道它是如何工作的，是否有人有时间通过​​一些简单的教程向我展示，因为文档没有帮助我。

忘记提及：我正在处理Mac project（不 iOS）

Answer 1

简单的NSPageController书籍模式教程

创建新的 Cocoa应用程序 - 项目。在界面构建器中打开MainMenu.xib，然后将 Image Well 和 Label 对象添加到您的应用程序窗口。还要添加页面控制器对象。

将页面控制器的视图设置为指向图像。

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将一些图像添加到Images.xcassets

我在这个示例项目中使用了三个图像：

• first.png
• second.png
• third.png

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MyAppDelegate.h

为页面控制器，标签和图像良好添加参考渠道。将MyAppDelegate设为NSPageControllerDelegate，并为图片添加NSArray。在此之后，您的MyAppDelegate.h文件应如下所示：

@interface MyAppDelegate : NSObject <NSApplicationDelegate, NSPageControllerDelegate>

@property (assign) IBOutlet NSWindow *window;
@property (unsafe_unretained) IBOutlet NSPageController *pageController;
@property (weak) IBOutlet NSImageView *imageView;
@property (weak) IBOutlet NSTextField *infoLabel;

@property (nonatomic) NSArray *imageArray;

@end

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MyAppDelegate.m

一些初始化：

- (void)awakeFromNib {
    _imageArray = @[ [NSImage imageNamed:@"first"],
                     [NSImage imageNamed:@"second"],
                     [NSImage imageNamed:@"third"]];

    /* Set delegate for NSPageControl */
    [_pageController setDelegate:self];
    /* Set arranged objects for NSPageControl */
    [_pageController setArrangedObjects:_imageArray];
    /* Set transition style, in this example we use book style */
    [_pageController setTransitionStyle:NSPageControllerTransitionStyleStackBook];

    /* Set info label's text */
    NSString *info = [NSString stringWithFormat:@"Image %ld/%ld", ([_pageController selectedIndex]+1), [_imageArray count]];
    [_infoLabel setStringValue:info];
}

页面控制器委托方法：

- (void)pageController:(NSPageController *)pageController didTransitionToObject:(id)object {
    /* When image is changed, update info label's text */
    NSString *info = [NSString stringWithFormat:@"Image %ld/%ld", ([_pageController selectedIndex]+1), [_imageArray count]];
    [_infoLabel setStringValue:info];
}

- (NSString *)pageController:(NSPageController *)pageController identifierForObject:(id)object {
    /* Returns object's array index as identiefier */
    NSString *identifier = [[NSNumber numberWithInteger:[_imageArray indexOfObject:object]] stringValue];
    return identifier;
}

- (NSViewController *)pageController:(NSPageController *)pageController viewControllerForIdentifier:(NSString *)identifier {
    /* Create new view controller and image view */
    NSViewController *vController = [NSViewController new];
    NSImageView *iView = [[NSImageView alloc] initWithFrame:[_imageView frame]];

    /* Get image from image array using identiefier and set image to view */
    [iView setImage:(NSImage *)[_imageArray objectAtIndex:[identifier integerValue]]];
    /* Set image view's frame style to none */
    [iView setImageFrameStyle:NSImageFrameNone];

    /* Add image view to view controller and return view controller */
    [vController setView:iView];
    return vController;
}

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已经完成了

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如果_pageController为null / nil

按ctrl并将鼠标拖动到MyAppDelegate.h文件中的_pageController，将页面控制器连接到_pageController。