第五十六篇、OC打开本地和网络上的word、ppt、excel、text等文件
iOS打开本地和网络上的word、ppt、excel、text等文件
iOS开发过程中可能需要预览一些文件，这些文件的格式可能有word、ppt、excel等文件格式。那么系统提供两个类去预览这些文件，这两个类分别为QLPreviewController和UIDocumentInteractionController。
一、先看QLPreviewController怎么用
1.导入头文件 import < QuickLook/QuickLook.h >
2.创建一个继承QuickLookViewController继承UIViewController
3.遵守协议< QLPreviewControllerDataSource, QLPreviewControllerDelegate >
.h文件中的代码 # import < UIKit/UIKit.h > # import < QuickLook/QuickLook.h > @interface QuickLookViewController : UIViewController < QLPreviewControllerDataSource, QLPreviewControllerDelegate > @property (nonatomic,strong) QLPreviewController *previewController; @property (nonatomic,retain)NSURL *fileURL; @end
.m文件中的代码： # import “QuickLookViewController.h” @interface QuickLookViewController () @end @implementation QuickLookViewController @synthesize previewController = _previewController; (void)viewDidLoad { [super viewDidLoad]; self.view.backgroundColor = [UIColor whiteColor]; self.title = @”附件预览”; _previewController = [[QLPreviewController alloc] init]; _previewController.dataSource = self; _previewController.delegate = self; _previewController.view.frame = CGRectMake(0, 64, self.view.frame.size.width , self.view.frame.size.height); _previewController.currentPreviewItemIndex = 0; // [self addChildViewController:_previewController]; [self.view addSubview:_previewController.view]; [_previewController reloadData]; } - (id ) previewController: (QLPreviewController *) controller previewItemAtIndex: (NSInteger) index{ return self.fileURL; } - (NSInteger)numberOfPreviewItemsInPreviewController:(QLPreviewController *)controller{ return 1; } @end
这样我们就完成了这个QuickLookViewController，使用：
NSString *filePath = [[NSBundle mainBundle] pathForResource:@”Reader” ofType:@”pdf”]; NSURL *URL = [NSURL fileURLWithPath:filePath]; QuickLookViewController *quickLookVC = [[QuickLookViewController alloc]init]; quickLookVC.fileURL = URL;//本地图片的url [self.navigationController pushViewController:quickLookVC animated:YES];
二、再看UIDocumentInteractionController
1.建立一个DocumentInteractionViewController，继承UIViewController
2.遵守代理UIDocumentInteractionControllerDelegate。
.h里面的代码 # import < UIKit/UIKit.h > @interface DocumentInteractionViewController : UIViewController< UIDocumentInteractionControllerDelegate,UIAlertViewDelegate > @property(nonatomic,strong) UIDocumentInteractionController *documentInteractionController; - (void)openFileWithURL:(NSURL *)URL; @end
.m里面的代码 # import “DocumentInteractionViewController.h” @interface DocumentInteractionViewController () { NSURL *_fileURL; BOOL _isPreview; BOOL _isOpenInMenu; } @end @implementation DocumentInteractionViewController (void)viewDidLoad { [super viewDidLoad]; self.view.backgroundColor = [UIColor whiteColor]; self.navigationController.navigationBarHidden = YES; } - (void)openFileWithURL:(NSURL *)URL { NSLog(@”now open %@”,URL); if (URL) { _fileURL = URL; _isPreview = NO; _isOpenInMenu = NO; // Initialize Document Interaction Controller self.documentInteractionController = [UIDocumentInteractionController interactionControllerWithURL:URL]; // Configure Document Interaction Controller self.documentInteractionController.delegate = self; // Preview File [self.documentInteractionController presentPreviewAnimated:YES]; [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(checkPreview) userInfo:nil repeats:NO]; } } (void)checkPreview { if(_isPreview == NO) { if (_fileURL) { // Initialize Document Interaction Controller self.documentInteractionController = [UIDocumentInteractionController interactionControllerWithURL:_fileURL]; // Configure Document Interaction Controller self.documentInteractionController.delegate = self; // Present Open In Menu [self.documentInteractionController presentOpenInMenuFromRect:CGRectZero inView:self.view animated:YES]; [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(checkOpenInMenu) userInfo:nil repeats:NO]; } } } (void)checkOpenInMenu{ if(_isOpenInMenu == NO) { [self showWarning]; [[UIApplication sharedApplication]openURL:_fileURL]; } } (void)showWarning{ NSString *fileType = [[_fileURL.absoluteString componentsSeparatedByString:@”.”]lastObject]; UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@”出错提示” message:[NSString stringWithFormat:@”不支持%@格式，请下载相关播放器打开”,fileType] delegate:self cancelButtonTitle:@”确定” otherButtonTitles:nil]; [alert show]; } (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{ [self.navigationController popViewControllerAnimated:YES]; } (UIViewController )documentInteractionControllerViewControllerForPreview:(UIDocumentInteractionController )controller{ return self; } // Preview presented/dismissed on document. Use to set up any HI underneath. - (void)documentInteractionControllerWillBeginPreview:(UIDocumentInteractionController *)controller{ controller.name = @”附件预览”; NSLog(@”willBeginPreview”); _isPreview = YES; } (void)documentInteractionControllerDidEndPreview:(UIDocumentInteractionController *)controller{ NSLog(@”didEndPreview”); [self.navigationController popViewControllerAnimated:YES]; } // Options menu presented/dismissed on document. Use to set up any HI underneath. - (void)documentInteractionControllerWillPresentOptionsMenu:(UIDocumentInteractionController *)controller{ NSLog(@”willPresentOptionsMenu”); } (void)documentInteractionControllerDidDismissOptionsMenu:(UIDocumentInteractionController *)controller{ NSLog(@”didDismissOptionsMenu”); } // Open in menu presented/dismissed on document. Use to set up any HI underneath. - (void)documentInteractionControllerWillPresentOpenInMenu:(UIDocumentInteractionController *)controller{ NSLog(@”willPresentOpenInMenu”); _isOpenInMenu = YES; } - (void)documentInteractionControllerDidDismissOpenInMenu:(UIDocumentInteractionController *)controller{ NSLog(@”didDismissOpenInMenu”); [self.navigationController popViewControllerAnimated:YES]; } @end 这样我们就完成了这个DocumentInteractionViewController，再来看用的时候怎么写： NSString *filePath = [[NSBundle mainBundle] pathForResource:@”Reader” ofType:@”pdf”]; NSURL *URL = [NSURL fileURLWithPath:filePath]; DocumentInteractionViewController *documentVC = [[DocumentInteractionViewController alloc]init]; [documentVC openFileWithURL:URL]; //本地文件的URL [self.navigationController pushViewController:documentVC animated:YES];
上面讲的都是打开的本地的文件，那么我如果要预览一个网页上的资源呢？类似这样的URL http://weixintest.ihk.cn/ihkwx_upload/1.pdf ，怎么办？
理论是这样的，第一次预览，我们要下载到本地，然后打开这个资源，那么第n（n>1）次打开就从本地找到下载的这个资源直接打开就可以了。
那么我们要在我们的vc里面写一个UIWebView了。比如我们的vc就是OpenRemoteFileViewController，那么来看具体的代码实现
.h文件里面的代码 # import < UIKit/UIKit.h> #import < QuickLook/QuickLook.h> @interface OpenRemoteFileViewController : UIViewController @property (nonatomic, retain)NSString *fileURLString; @end
.m文件里面的代码 #import “OpenRemoteFileViewController.h” @interface OpenRemoteFileViewController () < UIWebViewDelegate,QLPreviewControllerDataSource,QLPreviewControllerDelegate >{ UIWebView *openFileWebView; } @property (nonatomic,strong)NSURL *fileURL; @end @implementation OpenRemoteFileViewController -(void)openPDF:(UIButton *)sender{ openFileWebView = [[UIWebView alloc]initWithFrame:CGRectMake(0, 64, self.view.frame.size.width, self.view.frame.size.height)]; openFileWebView.delegate = self; [openFileWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:self.fileURLString]]]; } - (void)viewDidLoad { [super viewDidLoad]; self.view.backgroundColor = [UIColor whiteColor]; UIButton *centerBtn = [UIButton buttonWithType:UIButtonTypeCustom]; centerBtn.backgroundColor = [UIColor orangeColor]; centerBtn.frame = CGRectMake(0, 0, 200, 50); centerBtn.center = self.view.center; [centerBtn addTarget:self action:@selector(openPDF:) forControlEvents:UIControlEventTouchUpInside]; [centerBtn setTitle:@"打开一个远程PDF" forState:UIControlStateNormal]; [self.view addSubview:centerBtn]; } - (BOOL)webView:(UIWebView )webView shouldStartLoadWithRequest:(NSURLRequest )request navigationType:(UIWebViewNavigationType)navigationType { return YES; } #pragma mark - Web代理 - (void)webViewDidFinishLoad:(UIWebView *)webView { NSURL *targetURL = [NSURL URLWithString:self.fileURLString]; NSString *docPath = [self documentsDirectoryPath]; NSString *pathToDownloadTo = [NSString stringWithFormat:@"%@/%@", docPath, [targetURL lastPathComponent]]; NSFileManager *fileManager = [NSFileManager defaultManager]; BOOL hasDownLoad= [fileManager fileExistsAtPath:pathToDownloadTo]; if (hasDownLoad) { self.fileURL = [NSURL fileURLWithPath:pathToDownloadTo]; QLPreviewController *qlVC = [[QLPreviewController alloc]init]; qlVC.delegate = self; qlVC.dataSource = self; [self.navigationController pushViewController:qlVC animated:YES]; // } else { NSURL *targetURL = [NSURL URLWithString:self.fileURLString]; NSData *fileData = [[NSData alloc] initWithContentsOfURL:targetURL]; // Get the path to the App's Documents directory NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; // Get documents folder [fileData writeToFile:[NSString stringWithFormat:@"%@/%@", documentsDirectory, [targetURL lastPathComponent]] atomically:YES]; NSURLRequest *request = [NSURLRequest requestWithURL:targetURL]; [openFileWebView loadRequest:request]; } NSLog(@"webViewDidFinishLoad"); } (void)webView:(UIWebView )webView didFailLoadWithError:(NSError )error { NSLog(@”didFailLoadWithError”); } (NSInteger)numberOfPreviewItemsInPreviewController:(QLPreviewController *)controller { return 1; } (id )previewController:(QLPreviewController *)controller previewItemAtIndex:(NSInteger)index { return self.fileURL; } (void)previewControllerWillDismiss:(QLPreviewController *)controller { NSLog(@”previewControllerWillDismiss”); } (void)previewControllerDidDismiss:(QLPreviewController *)controller { NSLog(@”previewControllerDidDismiss”); } (BOOL)previewController:(QLPreviewController )controller shouldOpenURL:(NSURL )url forPreviewItem:(id )item{ return YES; } (CGRect)previewController:(QLPreviewController )controller frameForPreviewItem:(id )item inSourceView:(UIView __nullable * __nonnull)view{ return CGRectZero; } (NSString *)documentsDirectoryPath { NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectoryPath = [paths objectAtIndex:0]; return documentsDirectoryPath; } @end
使用：
OpenRemoteFileViewController *openRemoteFileVC =[[OpenRemoteFileViewController alloc]init]; openRemoteFileVC.fileURLString = @”http://weixintest.ihk.cn/ihkwx_upload/1.pdf“;//网络资源URL [self.navigationController pushViewController:openRemoteFileVC animated:YES];
文章最后提供demo地址：https://github.com/zhengwenming/OpenFile
