我正在尝试从应用程序文档文件夹中的文件名构造一个字符串。
到目前为止,我有:
NSArray *directoryPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [directoryPaths objectAtIndex:0];
NSError *error = nil;
NSArray *directoryContent = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:documentsDirectory error:&error];
NSLog(@"contents of document folder = %@", directoryContent);
这将打印:
contents of app's document folder = (
".DS_Store",
File1.doc,
"File2.pdf",
....
)
我想构造一串文件名,以某种方式分隔,也许用分号分隔,并通过以下代码尝试(最初没有任何分隔):
NSMutableString *fileList;
for (NSString *folder in directoryContent)
{
[fileList appendString:[NSString stringWithFormat:@"%@", folder]];
}
NSLog(@"file list = %@", fileList);
这打印file list = (null)
,我不知道我哪里出错了。有什么想法吗?
您应该在添加字符串之前初始化 MutableString。NSMutableString* fileList = [[NSMutableString alloc] init ];