NSInvalidArgumentException with stringByAppendingPathComponent

Question

i have a bundel settings with a string : version

in my bundle settings version = 2.9.1

in my project, if i use this code, all is good :

NSString *path = [documentsDirectory stringByAppendingPathComponent:@"ma/V_2.9.1/gma2/fixture_layers/ifocus.xml"];

if i use this code :

NSString *path = [documentsDirectory stringByAppendingPathComponent:(@"ma/V_%@/gma2/fixture_layers/ifocus.xml", version)];

i have this error :

* Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UITextField length]: unrecognized selector sent to instance 0x9753190'

Answer 1

NSString * path = [documentsDirectory stringByAppendingPathComponent：[NSString stringWithFormat：@“ ma/V_%@/gma2/fixture_layers/ifocus.xml”，版本]]；

Answer 2

Since you're already including multiple /'s in your string, there's no advantage to using stringByAppendingPathComponent. So you may as well just use:

NSString* path = [documentsDirectory stringByAppendingFormat:@"ma/V_%@/gma2/fixture_layers/ifocus.xml", version];

Another option, that gives you the benefit of stringByAppendingPathComponent, is to break it right down like this:

NSString* path = [[[[[documentsDirectory stringByAppendingPathComponent:@"ma"] stringByAppendingPathComponent:[NSString stringWithFormat:@"V_%@", version]] stringByAppendingPathComponent:@"gma2"] stringByAppendingPathComponent:@"fixture_layers"] stringByAppendingPathComponent:@"ifocus.xml"];

But that's kind of ugly.