iPhone - 减少文件管理器访问
我有一个删除文件的方法。实际上，我有这个
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *appFile = [documentsDirectory stringByAppendingPathComponent:myFile];
NSFileManager *fileManager = [NSFileManager defaultManager];
if ([fileManager fileExistsAtPath:appFile]) { //I am thinking about removing this line
[fileManager removeItemAtPath:appFile error:nil];
}
，因为我试图将文件管理器访问减少到最低限度，我正在考虑删除在删除文件之前检查文件是否存在的行。会安全吗？我是否有发生某种事故的风险？
我测试过，没有崩溃，但谁知道呢... 谢谢
I have a method that deletes files. Actually I have this
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *appFile = [documentsDirectory stringByAppendingPathComponent:myFile];
NSFileManager *fileManager = [NSFileManager defaultManager];
if ([fileManager fileExistsAtPath:appFile]) { //I am thinking about removing this line
[fileManager removeItemAtPath:appFile error:nil];
}
as I am trying to reduce the file manager access to a minimum, I am thinking in removing the line that checks for the existence of the file before removing it. Will it be safe? am I risking getting some kind of crash?
I have tested and I had no crash, but who knows...
thanks
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是的，您可以毫无问题地删除对文件是否存在的检查。您通常会检查removeItemAtPath的返回值是/否。如果文件不存在，则返回 NO。此时，您通常会检查 NSError 对象以获取详细信息。
Yes, you can remove the check for the file to exist without a problem. You would normally check the return value of removeItemAtPath for YES/NO. It would return NO if the file didn't exist. At which point, you would normally check the NSError object for details.