Ios 无法写入containerURLForSecurityApplicationGroupIdentifier？

在下面的示例中，我在写入时没有错误，但在读取时，数据长度为0。为什么我不能写入共享容器

+ (UIImage *)read {
    NSData *data = [NSData dataWithContentsOfFile:[self getPath]];
    NSLog(@"Data length: %d", data.length);
    UIImage *image = [UIImage imageWithContentsOfFile:[self getPath]];
    NSLog(@"%@", image);
    return image;
}

+ (void)write:(UIImage *)image {
    NSString *pngFilePath = [self getPath];
    NSData *data1 = [NSData dataWithData:UIImagePNGRepresentation(image)];
    [data1 writeToFile:pngFilePath atomically:YES];
}

+ (NSString *)getPath {
    NSURL *containerUrl = [[NSFileManager defaultManager] containerURLForSecurityApplicationGroupIdentifier:@"group.me.app"];
    NSString *pngFilePath = [[containerUrl absoluteString] stringByAppendingPathComponent:@"current.png"];

    NSLog(@"%@", pngFilePath);
    return pngFilePath;
}

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你把URL和文件路径搞混了。使用[containerUrl path]而不是[containerUrl absoluteString]，或者使用dataWithContentsOfURL/writeToURL而不是dataWithContentsOfFile/writeToFile