问题
I have an NSString path to my Documents folder.
NSString* stringURL = @"/var/mobile/Applications/5667FADC-F848-40CF-A309-
7BFE598AE6AB/Library/Application Support/MyAppDirectory";
When I cast it to NSUrl with
NSURL* url = [NSURL fileURLWithPath:stringUrl];
and NSLog(@"Created URL: %@",url);, i get some strange result:
///var/mobile/Applications/5667FADC-F848-40CF-A309-7BFE598AE6AB/Library/Application㤈㤋ތȀ乽啓汲唠䱒›楦敬⼺⼯慶⽲潭楢敬䄯灰楬慣楴湯⽳㘵㜶䅆䍄䘭㐸ⴸ〴䙃䄭〳ⴹ䈷䕆㤵䄸㙅䉁䰯扩慲祲䄯灰楬慣楴湯㈥匰灵潰瑲䴯䅹灰楄敲瑣牯⽹upport/MyAppDirectory/
Why is this so ? What am I doing wrong ?
回答1:
I didn't see any Chinese character when I log the value.
NSString* stringURL = @"/var/mobile/Applications/5667FADC-F848-40CF-A309-7BFE598AE6AB/Library/Application Support/MyAppDirectory";
NSURL* url = [NSURL fileURLWithPath:stringURL];
NSLog(@"%@",url);
回答2:
Classical mistake. Don't use NSLog (url), use NSLog (@"%@", url). The first argument to NSLog is a format string, and % characters in format strings are interpreted, not printed. For example, %s in a format string means another C-String is expected in the argument list. Since url could contain all kinds of characters, this is likely to lead to rubbish results or even crashes.
回答3:
Based on the answer you accepted from a previous question; it's because the use of stringByAddingPercentEscapesUsingEncoding will generate a printf-like formatting string containing %20S (the space between Application Support is converted to %20), which confuses NSLog():
NSURL *url = [NSURL fileURLWithString:[stringURL stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding] isDirectory:YES];
NSLog(url);
use NSLog("@%", url) to avoid this error.
来源：https://stackoverflow.com/questions/23425439/nsurl-fileurlwithpath-returns-strange-chinese-signs