在iphone指定目录写文件log

NSString * hisPath = [[NSPathEx DocPath] stringByAppendingFormat:@"/Log.txt"];NSString* strHistory = [NSString stringWithContentsOfFile:hisPath encoding:NSUTF8StringEncoding error:nil];if (strHistory != nil) {NSString* newStr = [strHistory stringByAppendingString:strLog];[newStr writeToFile:hisPath atomically:YES encoding:NSUTF8StringEncoding error:nil];}else {[strLog writeToFile:hisPath atomically:YES encoding:NSUTF8StringEncoding error:nil];}