美文网首页
QLPreviewController 显示文件

QLPreviewController 显示文件

作者: 然亦伞 | 来源:发表于2017-11-07 17:09 被阅读201次

import <QuickLook/QuickLook.h>

QLPreviewControllerDelegate,QLPreviewControllerDataSource

  • (void)addQLPreviewVC {
    QLPreviewController *QLPreviewVC = [[QLPreviewController alloc] init];
    QLPreviewVC.view.frame = self.view.bounds;
    QLPreviewVC.dataSource = self;
    QLPreviewVC.delegate = self;
    if([[UIDevice currentDevice].systemVersion floatValue] >= 10.0) {
    [self addChildViewController:QLPreviewVC];

      QLPreviewVC.currentPreviewItemIndex = 0;
    

    }
    [self.view addSubview:QLPreviewVC.view];
    }

  • (NSInteger)numberOfPreviewItemsInPreviewController:(QLPreviewController *)controller {
    return 1;
    }

  • (id<QLPreviewItem>)previewController:(QLPreviewController *)controller previewItemAtIndex:(NSInteger)index {
    //根据文件名判断文件类型
    NSRange pointRange = [self.fileName rangeOfString:@"."];
    NSString *subName;
    if (pointRange.location>0 && pointRange.location < self.fileName.length-2) {
    subName = [self.fileName substringFromIndex:pointRange.location+1];
    }
    if (subName.length > 3 && [subName containsString:@"#"]) {
    subName = [subName substringToIndex:3];
    }
    if ([subName isEqualToString:@"txt"]&&[[UIDevice currentDevice].systemVersion floatValue] < 9.0) {

      //使用QLPreviewController展示TXT等文档时,Windows下生成的UTF-8格式的文件会出现中文(以及其他特殊字符)乱码的问题。QLPreviewController只有在UTF16的编码下才能正确显示中文,需要在展示文件之前将文件的编码改为UTF16
      //需针对ANSI编码和Unicode编码分别进行解码
      
      //处理txt格式内容显示有乱码的情况
      NSData *fileData = [NSData dataWithContentsOfFile:self.filePath];
      
      //判断编码如果已经是NSUTF16StringEncoding编码,则isUNICODE与isANSI为空。
      //判断是UNICODE编码
      NSString *isUNICODE = [[NSString alloc] initWithData:fileData encoding:NSUTF8StringEncoding];
      //还是ANSI编码(-2147483623,-2147482591,-2147482062,-2147481296)encoding 任选一个就可以了。
      NSString *isANSI = [[NSString alloc] initWithData:fileData encoding:-2147483623];
      if (isUNICODE) {
          NSString *retStr = [[NSString alloc]initWithCString:[isUNICODE UTF8String] encoding:NSUTF8StringEncoding];
          NSData *data = [retStr dataUsingEncoding:NSUTF16StringEncoding];
          [data writeToFile:self.filePath atomically:YES];
      }
      else if(isANSI){
          NSData *data = [isANSI dataUsingEncoding:NSUTF16StringEncoding];
          [data writeToFile:self.filePath atomically:YES];
      }
    

    }

    return [NSURL fileURLWithPath:self.filePath];
    }

/*

  • 这个方法可不实现
    */
  • (void)previewControllerWillDismiss:(QLPreviewController *)controller {
    }

相关文章

网友评论

      本文标题:QLPreviewController 显示文件

      本文链接:https://www.haomeiwen.com/subject/uwfflxtx.html