当我有目录路径、文件名和扩展名时，如何构建完整且安全的文件路径？
假设directoryPath 指向应用程序的Documents 目录：
NSString *fileName = @"demo";
NSString *extension = @"txt";
NSString *filePath = [directoryPath stringByAppendingPathComponent:fileName];
filePath = [filePath stringByAppendingPathExtension:extension];
我认为这是这样做的方法，但我不确定。也许还有更好的。首先，我想也许我只是创建具有如下扩展名的文件名：
NSString *fileName = [NSString stringWithFormat:@"%@.%@", fileName, extension];
然后使用 -stringByAppendingPathComponent: 附加它，但我敢打赌由于某种原因这是一个坏主意。也许是因为它对扩展的点分隔符进行了硬编码。他们永远不会改变这一点，因为它会被扔得一塌糊涂。但你永远不知道。那么...
我做得对吗？
需要对旧操作系统版本的支持。
Assuming that directoryPath points to the Documents directory of the app:
NSString *fileName = @"demo";
NSString *extension = @"txt";
NSString *filePath = [directoryPath stringByAppendingPathComponent:fileName];
filePath = [filePath stringByAppendingPathExtension:extension];
I THINK that this is the way to do it, but I am not sure. Maybe there is an even better one. First I thought maybe I just create the file name with extension like this:
NSString *fileName = [NSString stringWithFormat:@"%@.%@", fileName, extension];
And then append it using -stringByAppendingPathComponent: , but I bet this is a bad idea for some reason. Maybe because it hard-codes the dot separator for extensions. They will never change this because it would be dump as hell. But you never know. So...
Did I do it the right way?
Need support for old OS versions.
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这又如何呢？
What about this?