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[基本解决]如何取消掉QLPreviewController调用时多增加的一个无用的导航界面

Swift crifan 1465浏览 0评论

已经:

[基本解决]用QLPreviewController打开预览文件但是显示空白

了,不过暂时有个问题:

点击后,下载到本地,去预览:

在预览文件界面:

点击回退时,出现:黑屏,多余的一个界面

然后才会到之前的界面:

而如果写成:

                    let openFileVC = OpenFileViewController(fullFilePath:fullFilePath)
                    let previewController = QLPreviewController()
                    previewController.delegate = openFileVC
                    previewController.dataSource = openFileVC
                   
                    previewController.transitioningDelegate = openFileVC
                    previewController.modalPresentationStyle = UIModalPresentationStyle.Custom
                   
                    self.showViewController(previewController, sender: self)
import UIKit
import QuickLook
class OpenFileViewController: NSObject, QLPreviewControllerDataSource, QLPreviewControllerDelegate, UIViewControllerTransitioningDelegate{
//class OpenFileViewController: UIViewController, QLPreviewControllerDataSource, QLPreviewControllerDelegate, UIViewControllerTransitioningDelegate{
   
    let fileUrl:NSURL
   
    init(fullFilePath:String){
        self.fileUrl = NSURL.fileURLWithPath(fullFilePath)
        print("self.fileUrl=\(self.fileUrl)")
        //self.fileUrl=file:///Users/crifan/Library/Developer/CoreSimulator/Devices/84FE8057-ED19-4703-BAE0-7C5156289534/data/Containers/Data/Application/C9EAE23F-BCF3-4C2E-9D90-DD282CE8FBB2/Documents/user-e85906ff-aca6-457f-af46-793e46b51c71/%E5%BC%A0%E7%82%B3%E6%81%8B-%E8%AE%BE%E8%AE%A1.docx
    }
    func numberOfPreviewItemsInPreviewController(controller: QLPreviewController) -> Int {
        return 1
    }
   
    func previewController(controller: QLPreviewController, previewItemAtIndex index: Int) -> QLPreviewItem {
        //file:///Users/crifan/Library/Developer/CoreSimulator/Devices/84FE8057-ED19-4703-BAE0-7C5156289534/data/Containers/Data/Application/5BCAF5A9-4508-43E7-AC3D-E3DF1D811C88/Documents/user-e85906ff-aca6-457f-af46-793e46b51c71/%E6%9D%8E%E5%BB%BA%E4%BA%AE-%E7%AE%80%E9%81%93.pptx
       
        return self.fileUrl
    }
}

则就是之前遇到的白屏问题:

[基本解决]用QLPreviewController打开预览文件但是显示空白

而如果改为现在的:

                    let openFileVC = OpenFileViewController(fullFilePath:fullFilePath)
                    self.showViewController(openFileVC, sender: self)
import UIKit
import QuickLook
class OpenFileViewController: UIViewController, QLPreviewControllerDataSource, QLPreviewControllerDelegate, UIViewControllerTransitioningDelegate{
    let fileUrl:NSURL
    let fileUrl:NSURL
   
    init(fullFilePath:String){
        self.fileUrl = NSURL.fileURLWithPath(fullFilePath)
        print("self.fileUrl=\(self.fileUrl)")
        //self.fileUrl=file:///Users/crifan/Library/Developer/CoreSimulator/Devices/84FE8057-ED19-4703-BAE0-7C5156289534/data/Containers/Data/Application/C9EAE23F-BCF3-4C2E-9D90-DD282CE8FBB2/Documents/user-e85906ff-aca6-457f-af46-793e46b51c71/%E5%BC%A0%E7%82%B3%E6%81%8B-%E8%AE%BE%E8%AE%A1.docx
        super.init(nibName: nil, bundle: nil)
    }
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
   
    func numberOfPreviewItemsInPreviewController(controller: QLPreviewController) -> Int {
        return 1
    }
   
    func previewController(controller: QLPreviewController, previewItemAtIndex index: Int) -> QLPreviewItem {
        //file:///Users/crifan/Library/Developer/CoreSimulator/Devices/84FE8057-ED19-4703-BAE0-7C5156289534/data/Containers/Data/Application/5BCAF5A9-4508-43E7-AC3D-E3DF1D811C88/Documents/user-e85906ff-aca6-457f-af46-793e46b51c71/%E6%9D%8E%E5%BB%BA%E4%BA%AE-%E7%AE%80%E9%81%93.pptx
       
        return self.fileUrl
    }
   
    override func viewDidLoad() {
        super.viewDidLoad()
       
        let previewController = QLPreviewController()
        previewController.delegate = self
        previewController.dataSource = self
       
//        previewController.modalPresentationStyle = UIModalPresentationStyle.FullScreen
        previewController.transitioningDelegate = self
        previewController.modalPresentationStyle = UIModalPresentationStyle.Custom
       
        self.showViewController(previewController, sender: self)
    }
}

就会出现上面的那个多余的导航页面

然后改为:

                    let openFileVC = OpenFileViewController(fullFilePath:fullFilePath)
                    let previewController = QLPreviewController()
                    previewController.delegate = openFileVC
                    previewController.dataSource = openFileVC
                    previewController.transitioningDelegate = openFileVC
                    previewController.modalPresentationStyle = UIModalPresentationStyle.Custom
                   
                    let openFileNvc = UINavigationController()
                    openFileNvc.view.backgroundColor = UIColor.grayColor()
                    openFileNvc.navigationBarHidden = true
//                    self.presentViewController(openFileNvc, animated: true, completion: nil)
                    self.showViewController(openFileNvc, sender: self)
                    openFileNvc.pushViewController(previewController, animated: false)

却是完全的白屏,没有任何内容了:

折腾到后来,是参考了:

iOS SDK: Previewing and Opening Documents – Envato Tuts+ Code Tutorial

去使用UIDocumentInteractionController去实现文件预览。

[总结]

[方案1]使用UIDocumentInteractionController实现文件预览:

优点:

  • 简单方便,无需创建新的ViewController即可预览
  • 除了预览之外,也有右上角按钮,可以调用其他app打开

缺点:显示方式是从下向上滑动出现,和当前此处的,通过导航栏,跳换到下一页的显示,显示方式不一致。

代码是:

import UIKit
import QuickLook
class FileManageViewController: UIViewController, UIDocumentInteractionControllerDelegate {
    func previewFile(){
        let fileUrl = NSURL.fileURLWithPath(fullFilePath)
        print("fileUrl=\(fileUrl)")
//fileUrl=file:///Users/crifan/Library/Developer/CoreSimulator/Devices/84FE8057-ED19-4703-BAE0-7C5156289534/data/Containers/Data/Application/631138B6-0881-454F-87CB-0AB427074F4E/Documents/user-e85906ff-aca6-457f-af46-793e46b51c71/%E5%88%A9%E7%94%A8VB6.0%E8%AE%BE%E8%AE%A1%E5%B1%8F%E5%B9%95%E4%BF%9D%E6%8A%A4%E7%A8%8B.txt
        let docIC = UIDocumentInteractionController(URL: fileUrl)
        print("docIC=\(docIC)") //docIC=<UIDocumentInteractionController: 0x7aec1f90>
        docIC.delegate = self
        docIC.presentPreviewAnimated(true)
    }
    func documentInteractionControllerViewControllerForPreview(controller: UIDocumentInteractionController) -> UIViewController{
        return self
    }

即可实现文件预览:

点击完成,返回:

[方案2]使用QLPreviewController预览文件

优点:

  • 除了预览之外,也有右上角按钮,可以调用其他app打开
  • 显示方式和导航栏新增页面跳转的方式一致

缺点:

需要创建新的ViewController才可以预览文件

显示方式是从下向上滑动出现,和当前此处的,通过导航栏,跳换到下一页的显示,显示方式不一致。

代码:

别的文件中调用:

import UIKit
import QuickLook
class FileManageViewController: UIViewController{
    func previewFile(fullFilePath:String)
        let openFileVC = OpenFileViewController(fullFilePath:fullFilePath)
        self.showViewController(openFileVC, sender: self)
    }
}

实现预览的视图控制器:

import UIKit
import QuickLook
class OpenFileViewController: UIViewController, QLPreviewControllerDataSource, QLPreviewControllerDelegate, UIViewControllerTransitioningDelegate{
    let fileUrl:NSURL
   
    init(fullFilePath:String){
        self.fileUrl = NSURL.fileURLWithPath(fullFilePath)
        print("self.fileUrl=\(self.fileUrl)")
//self.fileUrl=file:///Users/crifan/Library/Developer/CoreSimulator/Devices/84FE8057-ED19-4703-BAE0-7C5156289534/data/Containers/Data/Application/C9EAE23F-BCF3-4C2E-9D90-DD282CE8FBB2/Documents/user-e85906ff-aca6-457f-af46-793e46b51c71/%E5%BC%A0%E7%82%B3%E6%81%8B-%E8%AE%BE%E8%AE%A1.docx
        super.init(nibName: nil, bundle: nil)
    }
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
   
    func numberOfPreviewItemsInPreviewController(controller: QLPreviewController) -> Int {
        return 1
    }
   
    func previewController(controller: QLPreviewController, previewItemAtIndex index: Int) -> QLPreviewItem {
        return self.fileUrl
    }
   
    override func viewDidLoad() {
        super.viewDidLoad()
       
        self.view.backgroundColor = ColorAppBackground
        let previewController = QLPreviewController()
        previewController.view.backgroundColor = ColorAppBackground
        previewController.delegate = self
        previewController.dataSource = self
       
//        previewController.modalPresentationStyle = UIModalPresentationStyle.FullScreen
        previewController.transitioningDelegate = self
        previewController.modalPresentationStyle = UIModalPresentationStyle.Custom
        
        //method 1:
//        print("previewController=\(previewController)")
        //previewController=<QLPreviewController: 0x7d75daf0>
        self.showViewController(previewController, sender: self)
    }
}

点击返回:

才会到原先界面:

[方案3]使用QLPreviewController的view预览文件

优点:

  • 显示方式和导航栏新增页面跳转的方式一致
  • 不会多出那个导航页面

缺点:没有QLPreviewController自带的右上角right navigate item的调用第三方app打开文件的按钮了

和上面的[方案2]类似,把:

        //method 1:
//        print("previewController=\(previewController)")
        //previewController=<QLPreviewController: 0x7d75daf0>
        self.showViewController(previewController, sender: self)

换成:

        //method 2:
//        print("previewController.view=\(previewController.view)") //previewController.view=<UIView: 0x7d6cd840; frame = (0 0; 320 568); autoresize = W+H; layer = <CALayer: 0x7d07d250>>
//        print("self.view.subviews=\(self.view.subviews)") //self.view.subviews=[]
        self.view.addSubview(previewController.view)
//        print("self.view.subviews=\(self.view.subviews)") //self.view.subviews=[<UIView: 0x7d6cd840; frame = (0 0; 320 568); autoresize = W+H; layer = <CALayer: 0x7d07d250>>]

效果变成:

转载请注明:在路上 » [基本解决]如何取消掉QLPreviewController调用时多增加的一个无用的导航界面

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