I have a string which already contains a formatter %#.
NSString *str = #"This is an %#";
I need to parse that string and to replace %# with 'example'. If I use
[NSString stringWithFormat:#"%#", str];
I get the following output:
This is an %#
I want output like:
This is an example
NSString *str = #"This is an %#";
str = [str stringByReplacingOccurrencesOfString:#"%#" withString:#"example"];
I would recommand to use the formatted string as "format"
NSString *str = #"This is an %#";
str = [NSString stringWithFormat:str, #"example"];
is working with every type. A better solution than replacing, because you can use unspecified replacings
is very usefull if you use localized.strings with x values you want to add ;)
Related
I have a NSString object #"i like to do something".
I want to create a new string from that string with the length of 4 and get from 3rd character.
For example, the result must be #"like".
What can I do in objective-c?
Check out - (NSString *)substringWithRange:(NSRange)range
NSString *string = #"i like to do something";
NSString *substring = [string substringWithRange:NSMakeRange(2, 4)];
The substringWithRange message will do it.
substringWithRange: NSMakeRange (2, 6)
I want to place a string within a string. Basically in pseudo code:
"first part of string" + "(varying string)" + "third part of string"
How can I do this in objective-c? Is there a way to easily concatenate in obj-c? Thanks!
Yes, do
NSString *str = [NSString stringWithFormat: #"first part %# second part", varyingString];
For concatenation you can use stringByAppendingString
NSString *str = #"hello ";
str = [str stringByAppendingString:#"world"]; //str is now "hello world"
For multiple strings
NSString *varyingString1 = #"hello";
NSString *varyingString2 = #"world";
NSString *str = [NSString stringWithFormat: #"%# %#", varyingString1, varyingString2];
//str is now "hello world"
Variations on a theme:
NSString *varying = #"whatever it is";
NSString *final = [NSString stringWithFormat:#"first part %# third part", varying];
NSString *varying = #"whatever it is";
NSString *final = [[#"first part" stringByAppendingString:varying] stringByAppendingString:#"second part"];
NSMutableString *final = [NSMutableString stringWithString:#"first part"];
[final appendFormat:#"%# third part", varying];
NSMutableString *final = [NSMutableString stringWithString:#"first part"];
[final appendString:varying];
[final appendString:#"third part"];
NSString * varyingString = ...;
NSString * cat = [NSString stringWithFormat:#"%s%#%#",
"first part of string",
varyingString,
#"third part of string"];
or simply -[NSString stringByAppendingString:]
You would normally use -stringWithFormat here.
NSString *myString = [NSString stringWithFormat:#"%#%#%#", #"some text", stringVariable, #"some more text"];
Just do
NSString* newString=[NSString stringWithFormat:#"first part of string (%#) third part of string", #"foo"];
This gives you
#"first part of string (foo) third part of string"
Iam amazed that none of the top answers pointed out that under recent Objective-C versions (after they added literals), you can concatenate just like this:
#"first" #"second"
And it will result in:
#"firstsecond"
You can not use it with NSString objects, only with literals, but it can be useful in some cases.
simple one:
[[#"first" stringByAppendingString:#"second"] stringByAppendingString:#"third"];
if you have many STRINGS to Concatenate, you should use NSMutableString for better performance
Can someone help me to convert an NSObject to NSString?
I'm trying to do something like this -
NSString *address = [NSString stringWithFormat:ivpObj.addressStr];
But I got an warning - Format is not a string literal and no format arguments
Please some one help
How about this:
NSString *address = [NSString stringWithFormat:#"%#", ivpObj.addressStr];
Simpler still:
NSString *address = [ivpObj.addressStr description];
try this, it is worked for me
NSObject* obj= values[i];
NSString *StringObject= [NSString stringWithFormat:#"%#", obj];
it is giving you a warning because you are useing stringWithFormat and you are not passing in a format you just passing in either an NSString or a CString
so chose from on of the other options
[NSString stringWithString: ivpObj.addressStr]
[NSString stringWithCString: ivpObj.addressStr encoding: String_Encoding of you addressStr here]
[NSString stringWithUTF8String:ivpObj.addressStr]
this should remove your warnings, otherwise if you want to format the string using something similar to Eimantas's answer
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.