edu-saas-ios/MusicGradeExam/MusicGradeExam/UI/ExamLibrary/Controller/OpenFileViewController.m

//
//  OpenFileViewController.m
//  MusicGradeExam
//
//  Created by Kyle on 2020/7/21.
//  Copyright © 2020 DayaMusic. All rights reserved.
//

#import "OpenFileViewController.h"
#import <QuickLook/QuickLook.h>

@interface OpenFileViewController ()<QLPreviewControllerDataSource, QLPreviewControllerDelegate>

@property (nonatomic, strong) QLPreviewController *previewCtrl;

@property (nonatomic, strong) NSURL *fileURL;


@end

@implementation OpenFileViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    [self allocTitle:@"曲目详情"];
    [self addChildViewController:self.previewCtrl];
    [self.view addSubview:self.previewCtrl.view];
}


- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [self requestFileSource];
}

- (void)requestFileSource {
    if ([self isFileExist:self.urlString]) { // 本地加载
        self.fileURL = [self getSavePath:self.urlString];
        //刷新界面,如果不刷新的话，不重新走一遍代理方法，返回的url还是上一次的url
        [self.previewCtrl refreshCurrentPreviewItem];
    }
    else { // 网络下载
        [KSRequestManager downloadFileRequestWithFileUrl:self.urlString progress:^(int64_t bytesRead, int64_t totalBytes) {
            
        } success:^(NSURL * _Nonnull fileUrl) {
            self.fileURL = fileUrl;
            [self.previewCtrl refreshCurrentPreviewItem];
        } faliure:^(NSError * _Nonnull error) {
            
        }];
    }
}

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

- (NSInteger)numberOfPreviewItemsInPreviewController:(QLPreviewController *)previewController {
    return 1;
}

- (QLPreviewController *)previewCtrl {
    if (!_previewCtrl) {
        _previewCtrl = [[QLPreviewController alloc] init];
        _previewCtrl.view.frame = CGRectMake(0, 0, kScreenWidth, kScreenHeight - kNaviBarHeight - iPhoneXSafeBottomMargin);
        _previewCtrl.delegate = self;
        _previewCtrl.dataSource = self;
        _previewCtrl.currentPreviewItemIndex = 0;
        _previewCtrl.navigationController.navigationBar.userInteractionEnabled = NO;
    }
    return _previewCtrl;
}

#pragma mark ----- 文件处理
- (BOOL)saveFileWithFileName:(NSString *)fileName {
    NSURL *preUrl = [self getSavePath:fileName];
    NSString *copyPath = preUrl.path;
    NSFileManager *fileMamager = [NSFileManager defaultManager];
    NSString *path = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject] stringByAppendingPathComponent:@"FileLibrary"];
    path = [path stringByAppendingPathComponent:[NSString stringWithFormat:@"%@",fileName]];
    NSError *error = nil;
    if (![fileMamager copyItemAtPath:copyPath toPath:path error:&error]) {
        [fileMamager removeItemAtPath:copyPath error:nil];
        NSLog(@"拷贝失败:%@", error.userInfo);
        return NO;
    }
    else {
        [fileMamager removeItemAtPath:copyPath error:nil];
        return YES;
    }
}

- (NSURL *)getSavePath:(NSString *)fileName {
    //  在Documents目录下创建一个名为FileData的文件夹
    NSString *path = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject] stringByAppendingPathComponent:@"FileLibrary"];
    NSLog(@"%@",path);
    
    NSFileManager *fileManager = [NSFileManager defaultManager];
    BOOL isDir = FALSE;
    BOOL isDirExist = [fileManager fileExistsAtPath:path isDirectory:&isDir];
    if(!(isDirExist && isDir)) {
        BOOL bCreateDir = [fileManager createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:nil];
        if(!bCreateDir){
            NSLog(@"创建文件夹失败！");
        }
        NSLog(@"创建文件夹成功，文件路径%@",path);
    }
    
    path = [path stringByAppendingPathComponent:fileName];
    NSLog(@"file path:%@",path);
    NSURL *url=[NSURL fileURLWithPath:path];
    return url;
}

//判断文件是否已经在沙盒中存在
-(BOOL)isFileExist:(NSString *)fileName {
    NSString *path = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject] stringByAppendingPathComponent:@"FileLibrary"];
    NSString *filePath = [path stringByAppendingPathComponent:fileName];
    NSFileManager *fileManager = [NSFileManager defaultManager];
    BOOL result = [fileManager fileExistsAtPath:filePath];
    return result;
}
/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end