objective-c - 适用于OS X的Cocoa的NSPageController教程

我需要在某些项目中使用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。

忘了提及:我正在研究Mac project(不是 iOS)

最佳答案

NSPageController简单书本模式教程
创建新的 cocoa 应用程序 -project。在界面构建器中打开MainMenu.xib，然后将 Image Well 和标签对象添加到您的应用程序窗口。还添加页面 Controller 对象。

设置页面 Controller 的 View 以指向图像井。

将一些图像添加到Images.xcassets我在此示例项目中使用了三张图片:

first.png

second.png

third.png

MyAppDelegate.h
添加页面 Controller ，标签和图像引用的引用导出。将MyAppDelegate设置为NSPageControllerDelegate并为图像添加NSArray。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

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 Controller 委托(delegate)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;
}

完成了

如果您的_pageController为null/nil
通过按ctrl并用鼠标拖动到MyAppDelegate.h文件中的_pageController，将您的Page Controller连接到_pageController。

关于objective-c - 适用于OS X的Cocoa的NSPageController教程，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/14801513/