nsstring

I am curious to know how the OS or compiler manages the memory usage. Take this example of a login screen. If I enter the same strings for both user ID & password: say "anoop" both times, the following two strings have same addresses: NSString *userID = self.userNameField.stringValue; NSString *password = self.passwordField.stringValue; If I enter "anoop" & "Anoop" respectively, the address changes. How does the compiler know that the the password text is same as the user ID, so that instead of allocating a new memory space it uses the same reference? rob mayoff The answer in this case is that

I'm trying to parse an NSString that contains JSON data into an NSDictionary using SBJson 3.0.4, but when I do it, I get this error: "WebKit discarded an uncaught exception in the webView:shouldInsertText:replacingDOMRange:givenAction: delegate: -[__NSCFString JSONValue]: unrecognized selector sent to instance 0x6ab7a40" As far as I know (which isn't very far), the JSON I'm getting is valid, so I don't know why this is happening. My code compiles fine too… Here it is: NSString *tempURL = [NSString stringWithFormat:@"http://maps.googleapis.com/maps/api/geocode/json?address=%@&sensor=true"

I need an efficient piece of code that strips escape characters. This is regular escapes not HTML escape characters. Example: "\"", "\\\\", "\", "\\" I want a general algorithm to strip any kind of escape sequences. Could use any utility like regular expression. (NSString*) unescape:(NSString*) string { .... } This is the answer I wrote: -(NSString*) unescape:(NSString*) string { for(int i = 0; i < string.length; i++) { char a = [string characterAtIndex:i]; if([string characterAtIndex:i] == '\\' ) { string = [string stringByReplacingCharactersInRange:NSMakeRange(i,1) withString:@""]; } }

I have a UITextView with text: 🅰🅱🍉👌📧🎏❡ its image: ( This is screen shot of my text, I worry somebody can not see my special character ) If I am an end-user , I just see that there are only 7 characters on textView. But [textView.text length] = 13 I want to split this text into an array like this: array = @[ , , ,... ] But I can't detect where is, where is, where is ... :( Could you help me! Characters outside of the "basic multilingual plane" - in other words, characters whose Unicode value is greater than U+FFFF - are stored in NSString as two UTF-16 characters, a so-called surrogate pair .

I am fetching data from URL, and this data contains special characters, such as in the name Désirée . I want to display this in my TableView cell, but when I display it, it looks like this: Dösiröe . How do I make it display correctly? Fetch data NSString *jsonString = [NSString stringWithContentsOfURL:[NSURL URLWithString:URL] encoding: NSStringEncodingConversionAllowLossy error:nil]; SBJSON *parser = [[SBJSON alloc] init]; dictShow = [parser objectWithString:jsonString error:nil]; arr=[dictShow copy]; Display Data in TableView cell.textLabel.text = [arr objectAtIndex:indexPath.row]; just

I made a very simple storyboard based project with two View Controllers. I want to simply access a string declared in VC1 from VC2. The second VC should then display the text in a textfield upon the press of a button. I do not want to use delegation , a separate class for global data or global variables and Extern . Instead, I read that it was easy to achieve variable sharing using a reference to one VC in the other. For my code shown below, XCode didn't complain, however my problem is this: The NSLog in the second VC returns null. If anybody can tell me how to amend the code to pass the

I have a very simple question. Is there a built in method to shorten strings? If not can someone provide an example of doing that in ObjC ? For example: ThisIsAVeryLongString should become ThisIsAV... It needs to check if the string is over a certain amount of characters and if it is shorten it. It's pretty straightforward... NSString *originalString = @"SomethingVeryLong"; int newLength = 9; if (originalString.length > newLength) NSString *shortString = [originalString substringToIndex:newLength]; 来源： https://stackoverflow.com/questions/3303101/shorten-an-nsstring