iOS 使用QLPreviewController預覽本地和網路檔案

最近在項目中要做一個文檔預覽的功能，做的時候用到了iOS原生的QLPreviewController類，在此做個記錄分享

首先引入標頭檔

#import <QuickLook/QuickLook.h>

遵循代理

QLPreviewControllerDataSource

聲明一個QLPreviewController變數

@property (strong, nonatomic)QLPreviewController *previewController;

再聲明一個NSUrl對象存放要返回的檔案路徑

@property (copy, nonatomic)NSURL *fileURL;

在viewDidLoad中初始化

- (void)viewDidLoad {    [super viewDidLoad];    self.previewController  =  [[QLPreviewController alloc]  init];    self.previewController.dataSource  = self;}

在預覽本地檔案的事件裡面寫下如下代碼

//擷取本地檔案路徑    self.fileURL = [NSURL fileURLWithPath:[[NSBundle mainBundle]pathForResource:@"李碧華佳句賞析.doc" ofType:nil]];    [self presentViewController:self.previewController animated:YES completion:nil];

遵循代理方法

#pragma mark - QLPreviewControllerDataSource-(id<QLPreviewItem>)previewController:(QLPreviewController *)controller previewItemAtIndex:(NSInteger)index {    return self.fileURL;}- (NSInteger)numberOfPreviewItemsInPreviewController:(QLPreviewController *)previewController{    return 1;}

這樣本地檔案的預覽就成了

添加檔案到項目的時候要注意，將檔案放到工程項目之後，還要到Build Phases的Copy Bundle Resources中將檔案添加到資產庫，不然使用的時候會找不到檔案而崩潰

接下來是預覽網路檔案

在網路檔案預覽的事件裡面寫下如下代碼(需要引入af)

NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];        AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];    NSString *urlStr = @"https://www.tutorialspoint.com/ios/ios_tutorial.pdf";    NSString *fileName = [urlStr lastPathComponent]; //擷取檔案名稱    NSURL *URL = [NSURL URLWithString:urlStr];    NSURLRequest *request = [NSURLRequest requestWithURL:URL];        //判斷是否存在    if([self isFileExist:fileName]) {        NSURL *documentsDirectoryURL = [[NSFileManager defaultManager] URLForDirectory:NSDocumentDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:NO error:nil];        NSURL *url = [documentsDirectoryURL URLByAppendingPathComponent:fileName];        self.fileURL = url;        [self presentViewController:self.previewController animated:YES completion:nil];    }else {        [SVProgressHUD showWithStatus:@"下載中"];        NSURLSessionDownloadTask *downloadTask = [manager downloadTaskWithRequest:request progress:^(NSProgress *downloadProgress){                    } destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) {            NSURL *documentsDirectoryURL = [[NSFileManager defaultManager] URLForDirectory:NSDocumentDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:NO error:nil];            NSURL *url = [documentsDirectoryURL URLByAppendingPathComponent:fileName];            return url;        } completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) {            [SVProgressHUD dismiss];            self.fileURL = filePath;            [self presentViewController:self.previewController animated:YES completion:nil];        }];        [downloadTask resume];    }

添加檔案是否存在判斷方法

//判斷檔案是否已經在沙箱中存在-(BOOL) isFileExist:(NSString *)fileName{    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);    NSString *path = [paths objectAtIndex:0];    NSString *filePath = [path stringByAppendingPathComponent:fileName];    NSFileManager *fileManager = [NSFileManager defaultManager];    BOOL result = [fileManager fileExistsAtPath:filePath];    return result;}

這樣網路檔案預覽就成了

附上demo地址