Searched around and didn't see an obvious answer. Thanks in advance.
I simply want to append an # sign at the end of an NSString.
This will work:
NSString *myConstString = #"john#example.com";
And this will, too:
NSString *aString = ...;
NSString *myString = [aString stringByAppendingString: #"#"];
# is just a character which doesn't need escaping.
Related
I need to get url string from NSString. I do the following:
NSString * str = [NSString stringWithString:#"i#gmail.com"];
NSString * eStr = [str stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSLog(#"%#",eStr);
The result is i#gmail.com. But I need i%40gmail.com. replacing NSUTF8StringEncoding with NSASCIIStringEncoding doesn't help.
You're using the wrong method. This does the opposite, translating percent
escapes to their characters. You probably want to use
stringByAddingPercentEscapesUsingEncoding:.
NSString *str = #"i#gmail.com";
NSString *eStr =
[str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
Apart from that, looks like the # character is not escaped by default. Then,
as the documentation for the above method points out, you'll need to use
CoreFoundation to achieve what you want.
NSString *str = #"i#gmail.com";
CFStringRef eStr = CFURLCreateStringByAddingPercentEscapes(
kCFAllocatorDefault,
(CFStringRef)str,
NULL,
(CFStringRef)#"#",
kCFStringEncodingUTF8
);
NSLog(#"%#", eStr);
CFRelease(eStr);
Please check the documentation to know more about the function used and
how to make it fit your needs.
I have a set of NSString representing the names of the files in a directory. These names are structured this way:
XXXXXXXXX_YYYY_AAAA.ext
All the sections separated by "_" are of variable length and I would only have the first.
How can I separate the first part from the other?
Find the position of the '_' character, then get a substring 0 through that position. Note that substringToIndex: does not include the character at the index position.
NSRange r = [myString rangeOfString:#"_"];
NSString *res = [myString substringToIndex:r.location];
Take a look at the NSString method componentsSeparatedByString:. That will tokenize a string and return you an array. Something like this:
NSArray *array = [#"XXXXXXXXX_YYYY_AAAA.ext" componentsSeparatedByString:#"_"];
NSString *firstToken = [array objectAtIndex:0];
NSArray *array = [yourString componentsSeparatedByString:#"_"];
NSString *Xs = [array objectAtIndex:0];
Try componentsSeparatedByString: under the heading Dividing Strings.
NSString Docs
Times like this and my Objective-C noobness shows. :-/
So, the more I work on a routine to do this, the more complex it's becoming, and I'm wondering if there isn't just a simple method to change the name of a filename in a path. Basically, I want to change #"/some/path/abc.txt to #"/some/path/xyz.txt -- replacing the filename portion but not changing the path or extension.
Thanks!
Try the following:
NSString* initPath = ...
NSString *newPath = [[NSString stringWithFormat:#"%#/%#",
[initPath stringByDeletingLastPathComponent], newFileName]
stringByAppendingPathExtension:[initPath pathExtension]];
What Vladimir said, just broken down more to make it a little easier to read:
NSString *pathToFile = #"/Path/To/File.txt";
NSString *oldFileName = [pathToFile lastPathComponent];
NSString *newFileName = [#"Document" stringByAppendingPathExtension:[oldFileName pathExtension];
NSString *newPathToFile = [pathToFile stringByDeletingLastPathComponent];
[newPathToFile stringByAppendingString:newFileName];
Take a look at the "Working With Paths" section of the NSString docs. In particular, lastPathComponent, pathExtension and stringByDeletingPathExtension: should do what you want.
You can try something like this:
NSRange slashRange = [myString rangeOfString:#"\\" options:NSBackwardsSearch];
NSRange periodRange = [myString rangeOfString:#"." options:NSBackwardsSearch];
NSString *newString = [myString stringByReplacingCharactersInRange:NSMakeRange(slashRange.location, periodRange.location) withString:#"replacement-string-here"];
What this code does is it gets the location of the \ and . characters and performs a backwards search so that it returns the last occurrence of it in the string.
Then, it creates a new range based on those previous ranges and replaces the contents in that range with stringByReplacingCharactersInRange:.
Try this:
NSString* path = [startString stringByDeletingLastPathComponent];
NSString* extension = [startString pathExtension];
NSString* replacementFileName = [#"foo" stringByAppendingPathExtension: extension];
NSString result = [path stringByAppendingPathComponent: replacementFileName];
I have a ascii code, for the letter 'a', and I want to get a string by its ascii code, is it possible with NSString?
This could also work:
NSString *foo = [NSString stringWithFormat:#"%c", 97];
Didn’t test it.
If you mean you have a byte that represents an ASCII-encoded character and you want to make a string out of it, NSString has an initializer just for that.
char characterCodeInASCII = 97;
NSString *stringWithAInIt = [[NSString alloc] initWithBytes:&characterCodeInASCII length:1 encoding:NSASCIIStringEncoding];
I have multiple NSStrings and i wish to merge them into one other, here is my code so far...
NSString *newURL = [_parameters objectForKey:#"url"];
NSString *emailBody = #"Hey!<br>I just snipped my long url with My Cool App for iPhone in just a few seconds!<p><b>"+newURL+#"</b></p>";
If you know the number of your existing strings, you can just concat them:
NSString* longString = [firstString stringByAppendingString:secondString];
or:
NSString* longString = [NSString stringWithFormat:#"A string: %#, a float: %1.2f", #"string", 31415.9265];
If you have an arbitrary number of strings, you could put them in an NSArray and join them with:
NSArray* chunks = ... get an array, say by splitting it;
NSString* string = [chunks componentsJoinedByString: #" :-) "];
(Taken from http://borkware.com/quickies/one?topic=NSString)
Another good resource for string handling in Cocoa is: "String Programming Guide"
You can try
NSString *emailBody = [ NSString stringWithFormat: #"Hey!<br>I just snipped my long url with Snippety Snip for iPhone in just a few seconds, why not check it out?<p><b>%#</b></p>", newURL ];
Given that you've got multiple strings I recommend using an Array:
NSArray *array = [NSArray arrayWithObjects:#"URL", #"person", "body"];
NSString *combined = [array componentsJoinedByString:#""];
Formatting string has better readability and less error-prone:
NSString *newURL = [_parameters objectForKey:#"url"];
NSString *emailBody = [NSString stringWithFormat:#"Hey!<br>I just snipped my long url with Snippety Snip for iPhone in just a few seconds, why not check it out?<p><b>%#</b></p>", newUrl, newUrl];
You can concatenate strings in Cocoa using:
[NSString stringByAppendingString:]
Or you could use the [NSString stringWithFormat] method which will allow you to specify a C-style format string with a variable argument list to populate the escape sequences.