Objective c 在Xcode 11.3中读取文档中的文件失败

当我使用

stringWithContentsOfURL

读取文档中的文件时，它失败了

这是Xcode控制台中的错误：

Error Domain=NSCOCAERRORDOMAIN Code=256“无法打开文件“1.txt”。“用户信息={NSURL=/var/mobile/Containers/Data/Application/E026973D-11B6-4895-B8FE-7f9fbc11c12/Documents/bbbbb/1.txt}”

这是我的代码：

 //use objective-c
 +(NSString * )loadDataFromDocumentDirectory:(NSString *)path andSubDirectory:(NSString *)subdirectory {
    path = [self stripSlashIfNeeded:path];
    subdirectory = [self stripSlashIfNeeded:subdirectory];

    // Create generic beginning to file save path
    NSMutableString *savePath = [[NSMutableString alloc] initWithFormat:@"%@/",[self applicationDocumentsDirectory].path];
    [savePath appendString:subdirectory];
    [savePath appendString:@"/"];

    // Add requested save path
    NSError *err = nil;
    [savePath appendString:path];
    NSURL *fileURL = [NSURL URLWithString:savePath];
    NSString *loadStr = [NSString stringWithContentsOfURL:fileURL encoding:NSUTF8StringEncoding error:&err]  ;
    if (err) NSLog(@"load error : %@", err);

    return loadStr;
}

//use swift
let loadData = FileSave.loadData(fromDocumentDirectory: "1.txt", andSubDirectory: "bbbb")

---

您使用了错误的API：

URLWithString

用于包含方案的URL（

file://

或

https://

），对于文件系统路径，必须使用

fileURLWithPath

但是，强烈建议始终使用与URL相关的API来构建路径

+ (NSString * )loadDataFromDocumentDirectory:(NSString *)path andSubDirectory:(NSString *)subdirectory {
    // path = [self stripSlashIfNeeded:path]; not needed
    // subdirectory = [self stripSlashIfNeeded:subdirectory]; not needed
    // Create generic beginning to file save path
    NSURL *saveURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:subdirectory];

    // Add requested save path
    NSError *err = nil;
    NSURL *fileURL = [saveURL URLByAppendingPathComponent:path];
    NSString *loadStr = [NSString stringWithContentsOfURL:fileURL encoding:NSUTF8StringEncoding error:&err]  ;
    if (err) NSLog(@"load error : %@", err);

    return loadStr;
}

---

您使用了错误的API：

URLWithString

用于包含方案的URL（

file://

或

https://

），对于文件系统路径，必须使用

fileURLWithPath

但是，强烈建议始终使用与URL相关的API来构建路径

+ (NSString * )loadDataFromDocumentDirectory:(NSString *)path andSubDirectory:(NSString *)subdirectory {
    // path = [self stripSlashIfNeeded:path]; not needed
    // subdirectory = [self stripSlashIfNeeded:subdirectory]; not needed
    // Create generic beginning to file save path
    NSURL *saveURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:subdirectory];

    // Add requested save path
    NSError *err = nil;
    NSURL *fileURL = [saveURL URLByAppendingPathComponent:path];
    NSString *loadStr = [NSString stringWithContentsOfURL:fileURL encoding:NSUTF8StringEncoding error:&err]  ;
    if (err) NSLog(@"load error : %@", err);

    return loadStr;
}