一、從系統(tǒng)“文件”APP選擇文件上傳

#import "ViewController.h"
 
@interface ViewController () <UIDocumentPickerDelegate>
 
@property (nonatomic, strong) UIDocumentPickerViewController *documentPickerVC;
 
@end
 
@implementation ViewController
 
- (void)viewDidLoad {
    [super viewDidLoad];
}
 
- (IBAction)tapSelectFileAction:(id)sender {
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.35 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        [self presentViewController:self.documentPickerVC animated:YES completion:nil];
    });
}
 
/**
 初始化 UIDocumentPickerViewController
 
 @param allowedUTIs 支持的文件類型數(shù)組
 "public.content",
 "public.text",
 "public.source-code",
 "public.image",
 "public.audiovisual-content",
 "com.adobe.pdf",
 "com.apple.keynote.key",
 "com.microsoft.word.doc",
 "com.microsoft.excel.xls",
 "com.microsoft.powerpoint.ppt"
 @param mode 支持的共享模式
 */
- (UIDocumentPickerViewController *)documentPickerVC {
    if (!_documentPickerVC) {
        NSArray *types = @[@"public.content",@"public.text"];
        self.documentPickerVC = [[UIDocumentPickerViewController alloc] initWithDocumentTypes:types inMode:UIDocumentPickerModeOpen];
        // 設(shè)置代理
        _documentPickerVC.delegate = self;
        // 設(shè)置模態(tài)彈出方式
        _documentPickerVC.modalPresentationStyle = UIModalPresentationFormSheet;
    }
    return _documentPickerVC;
}
 
#pragma mark - UIDocumentPickerDelegate
 
- (void)documentPicker:(UIDocumentPickerViewController *)controller didPickDocumentsAtURLs:(NSArray<NSURL *> *)urls {
    // 獲取授權(quán)
    BOOL fileUrlAuthozied = [urls.firstObject startAccessingSecurityScopedResource];
    if (fileUrlAuthozied) {
        // 通過文件協(xié)調(diào)工具來得到新的文件地址，以此得到文件保護(hù)功能
        NSFileCoordinator *fileCoordinator = [[NSFileCoordinator alloc] init];
        NSError *error;
        
        [fileCoordinator coordinateReadingItemAtURL:urls.firstObject options:0 error:&error byAccessor:^(NSURL *newURL) {
            // 讀取文件
            NSString *fileName = [newURL lastPathComponent];
            NSError *error = nil;
            NSData *fileData = [NSData dataWithContentsOfURL:newURL options:NSDataReadingMappedIfSafe error:&error];
            if (error) {
                // 讀取出錯(cuò)
            } else {
                // 上傳
                NSLog(@"fileName : %@", fileName);
                // [self uploadingWithFileData:fileData fileName:fileName fileURL:newURL];
            }
            [self dismissViewControllerAnimated:YES completion:NULL];
        }];
        [urls.firstObject stopAccessingSecurityScopedResource];
    } else {
        // 授權(quán)失敗
    }
}
 
@end

二、從開發(fā)APP中保存文件到系統(tǒng)“文件”APP

#pragma mark - 下載文件
/// http://jadinec-test.oss-accelerate.aliyuncs.com/excelFile/a5f23e130d5e4dd7adda942c45207927.pdf
- (void)downLoadWithFilePath:(NSString *)filePath {
    float version = [[[UIDevice currentDevice] systemVersion] floatValue];
    if (version >= 11) {
        
    } else {
        [MBProgressHUD showError:@"下載文件要求手機(jī)系統(tǒng)版本在11.0以上"];
        return;
    }
    /**
    /// 保存網(wǎng)絡(luò)文件到沙盒一
    NSURLRequest *req = [[NSURLRequest alloc] initWithURL:[NSURL URLWithString:filePath]];
    NSData *fileData = [NSURLConnection sendSynchronousRequest:req returningResponse:nil error:nil];
    NSString *temp = NSTemporaryDirectory();
    NSFileManager *fm = [NSFileManager defaultManager];
    NSString *fullPath = [self getNativeFilePath:[filePath componentsSeparatedByString:@"/"].lastObject];
    BOOL downResult = [fm createFileAtPath:fullPath contents:fileData attributes:nil];
    */
    /// 保存網(wǎng)絡(luò)文件到沙盒二
    NSData *fileData = [NSData dataWithContentsOfURL:[NSURL URLWithString:filePath]];
    NSString *fullPath = [self getNativeFilePath:[filePath componentsSeparatedByString:@"/"].lastObject];
    BOOL downResult = [fileData writeToFile:fullPath atomically:YES];
    
    if (downResult) {
        UIDocumentPickerViewController *documentPickerVC = [[UIDocumentPickerViewController alloc] initWithURL:[NSURL fileURLWithPath:fullPath] inMode:UIDocumentPickerModeExportToService];
        // 設(shè)置代理
        documentPickerVC.delegate = self;
        // 設(shè)置模態(tài)彈出方式
        documentPickerVC.modalPresentationStyle = UIModalPresentationFormSheet;
        [self.navigationController presentViewController:documentPickerVC animated:YES completion:nil];
    }
}
 
// 獲得文件沙盒地址
- (NSString *)getNativeFilePath:(NSString *)fileName {
    NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
    NSString *munu = [NSString stringWithFormat:@"%@/%@",@"downLoad",fileName];
    NSString *filePath = [path stringByAppendingPathComponent:munu];
    // 判斷是否存在,不存在則創(chuàng)建
    NSFileManager *fileManager = [NSFileManager defaultManager];
    // fileExistsAtPath 判斷一個(gè)文件或目錄是否有效，isDirectory判斷是否一個(gè)目錄
    BOOL isDir = NO;
    NSMutableArray *theArr = [[filePath componentsSeparatedByString:@"/"] mutableCopy];
    [theArr removeLastObject];
    NSString *thePath = [theArr componentsJoinedByString:@"/"];
    BOOL existed = [fileManager fileExistsAtPath:thePath isDirectory:&isDir];
    if ( !(isDir == YES && existed == YES) ) { // 如果文件夾不存在
        [fileManager createDirectoryAtPath:thePath withIntermediateDirectories:YES attributes:nil error:nil];
    }
    return filePath;
}
 
#pragma mark - UIDocumentPickerDelegate
 
- (void)documentPicker:(UIDocumentPickerViewController *)controller didPickDocumentsAtURLs:(NSArray<NSURL *> *)urls {
    // 獲取授權(quán)
    BOOL fileUrlAuthozied = [urls.firstObject startAccessingSecurityScopedResource];
    if (fileUrlAuthozied) {
        // 通過文件協(xié)調(diào)工具來得到新的文件地址，以此得到文件保護(hù)功能
        NSFileCoordinator *fileCoordinator = [[NSFileCoordinator alloc] init];
        NSError *error;
        
        [fileCoordinator coordinateReadingItemAtURL:urls.firstObject options:0 error:&error byAccessor:^(NSURL *newURL) {
            // 讀取文件
            NSString *fileName = [newURL lastPathComponent];
            NSError *error = nil;
            //NSData *fileData = [NSData dataWithContentsOfURL:newURL options:NSDataReadingMappedIfSafe error:&error];
            if (error) {
                // 讀取出錯(cuò)
            } else {
                // 上傳
                NSLog(@"fileName : %@", fileName);
            }
        }];
        [urls.firstObject stopAccessingSecurityScopedResource];
    } else {
        // 授權(quán)失敗
    }
}