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我只是写了一个小演示。它的所有功能都是使用 QLPreviewView 来快速查看 Pages 文件。应用运行时，可以滚动查看Pages文件内容，点击保存为PNG按钮，应用会将当前显示的内容保存为PNG图片文件。您可以在 save 方法中获得实现。我只是在该方法中尝试了两种实现，但都没有奏效。我刚刚得到一个空白图像，里面填充了窗口背景颜色。这里有一些建议吗？谢谢。

代码和应用程​​序屏幕截图可以在这里找到http://dr.ibuick.com/updU 

#import <Cocoa/Cocoa.h>
#import <Quartz/Quartz.h>
#import <QuickLook/QuickLook.h>
#import "IBAppDelegate.h"

@interface IBAppDelegate (QLPreviewItem) <QLPreviewItem>

@end

@implementation IBAppDelegate (QLPreviewItem)

    - (NSURL *)previewItemURL
    {
        return self.resolvedFileURL;
    }

    - (NSString *)previewItemTitle
    {
        return [self.originalURL absoluteString];
    }

@end

@implementation IBAppDelegate

    - (void)applicationDidFinishLaunching:(NSNotification *)aNotification
    {
        _resolvedFileURL = [NSURL fileURLWithPath:@"/Users/buick/Desktop/1.pages"];
        _originalURL = [NSURL fileURLWithPath:@"/Users/buick/Desktop/1.pages"];
        _previewView = [[QLPreviewView alloc] initWithFrame:NSMakeRect(0, 50, 480, 360) 
                        style:QLPreviewViewStyleNormal];
        [_previewView setPreviewItem:self];
        [self.window.contentView addSubview:_previewView];
    }

    - (IBAction)save:(id)sender {

        // Method 1

        [_previewView lockFocus];
        NSBitmapImageRep* rep = [_previewView     
            bitmapImageRepForCachingDisplayInRect:_previewView.bounds];
        [_previewView cacheDisplayInRect:_previewView.bounds toBitmapImageRep:rep];
        [_previewView unlockFocus];
        [[rep representationUsingType:NSPNGFileType properties:nil] 
            writeToFile:@"/Users/buick/Desktop/1.png" atomically:YES];

        // Method 2
        [_previewView lockFocus];

        NSBitmapImageRep *bits;
        bits = [[NSBitmapImageRep alloc]
            initWithFocusedViewRect:[_previewView visibleRect]];
        [_previewView unlockFocus];
        NSData *imageData;
        NSDictionary *imageProps = [NSDictionary dictionaryWithObject:[NSNumber             
            numberWithFloat:0.9] forKey:NSImageCompressionFactor];
        imageData = [bits representationUsingType:NSJPEGFileType     
            properties:imageProps];
        [imageData writeToFile:@"/Users/buick/Desktop/1.png" atomically:YES];
    }
@end
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1 回答 1

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好的，我想我明白了。尝试在初始化时将 QLPreviewView 类型设置为 QLPreviewViewStyleCompact。

pv = [[QLPreviewView alloc] initWithFrame:pv.bounds
                                    style:QLPreviewViewStyleCompact];

然后使用这个类别

来自 Matt Gemmel 的 NSImage+QuickLook...

github

            NSImage *image = [NSImage imageWithPreviewOfFileAtPath:[[self.files objectAtIndex:i] path] ofSize:NSMakeSize(1200, 1920) asIcon:NO];
于 2013-08-08T19:57:07.003 回答