nsstring

问题 I'm parsing json with SBJson. I receive an error "-JSONValue failed. Error is: Unescaped control character [0x09]" when parsing my json string, it has unencoded tab. How to replace this tab in my json string to \t? If i remove tab manualy, everything is good. Or how to encode this tab properly? 回答1: You can use stringByReplacingOccurrencesOfString:withString: : NSString * newJsonString = [oldJsonString stringByReplacingOccurrencesOfString:@"\t" withString:@"\\t"]; 来源： https://stackoverflow

问题 I am converting the response data from a web request to an NSString in the following manner: NSData *data = self.responseData; if (!data) { return nil; } NSStringEncoding encoding = CFStringConvertEncodingToNSStringEncoding(CFStringConvertIANACharSetNameToEncoding((__bridge CFStringRef)[self.response textEncodingName])); NSString *responseString = [[NSString alloc] initWithData:data encoding:encoding]; However the resulting string looks like this: "birthday":"04\/01\/1990", "email":"some

问题 I'm trying to convert an NSString which contains a greek word to a const char. I'm trying to convert the string with UTF-8 encoding which is for greek language and when i'm logging the char out, it has junk in it. Please a little help here.. //this is the greek word NSString *letter = textFieldLetter.text; //NSString to const char conversion for the sql query const char *cLetter = (const char *)[letter cStringUsingEncoding:NSUTF8StringEncoding]; //this contains junk! NSLog(@"letter: %s"

问题 Is there a way to "auto detect" the encoding of a resource when loading it using stringFromContentsOfURL? The current (non-depracated) method, + (id)stringWithContentsOfURL:(NSURL *)url encoding:(NSStringEncoding)enc error:(NSError **)error; , wants a URL encoding. I've noticed that getting it wrong does make a difference for what I want to do. Is there a way to check this somehow and always get it right? (Right now I'm using UTF8.) 回答1: I'd try this function from the docs Returns a string

问题 I have a binary file (file.bin) in the resources folder, I want to read it and show it as binary. The idea its to put the binary information into a array, but, at first, I'm trying to show it in a UILabel, like that: ` NSData *databuffer; NSString *stringdata; NSString *filePath = [[NSBundle mainBundle] pathForResource:@"file" ofType:@"bin"]; NSData *myData = [NSData dataWithContentsOfFile:filePath]; if (myData) { stringdata = [NSString stringWithFormat:@"%@",[myData description]]; labelfile

问题 How can I concatenate an NSString URL? For example: http://isomewebsite.com/username=[someuservariable]&password=[somevariable] 回答1: Try with below code. NSString* myURLString = [NSString stringWithFormat:@"somewebsite.com/username=%@&password=%@", myUserName,myPassword]; NSURL *url = [NSURL URLWithString:myURLString]; Here is the blog tutorial will help you know more about Handling url authentication challenges accessing password protected servers 回答2: You can use the method stringWithFormat

问题 I'm experiencing issues when converting decimal to currency for Korean Won, Cambodian Riel and Iranian Rial and showing the result to the UILabel text. Conversion itself passes just fine and I can see correct currency symbol at the debugger, even the NSLog prints the symbol well. If I assign this NSString instance to the UILabel text, the currency symbol is shown as a crossed box instead of the correct symbol. There is no other code between, does not matter what font I use. I tried to print ₩

问题 Is there any equivalent method in AppKit (for Cocoa on Mac OS X) that does the same thing as UIKit's [NSString sizeWithFont:constrainedToSize:] ? If not, how could I go about getting the amount of space needed to render a particular string constrained to a width/height? Update: Below is a snippet of code I'm using that I expect would produce the results I'm after. NSDictionary *attributes = [NSDictionary dictionaryWithObjectsAndKeys: [NSFont systemFontOfSize: [NSFont smallSystemFontSize]],

问题 I have 2 new questions: 1) Consider this line: NSString *myString = [[NSString alloc] initWithString: @"Value"]; There were two things I learned, but I would like confirmation: As I learned, the "alloc" message indicates that the instance of NSString will be stored in the "heap" memory. I understood also that primitive variables such as "chars" are stored in the "stack" memory. Does this mean that: the instance of NSString is stored in the heap memory; AND that this object has an iVar pointer

问题 I have a NSString with some html tags, how can I search for tag and get the content of url? I'm not sure if I must use Hpple or a simple Regex expression. In both cases can I have some example? 回答1: One way to do this is using NSScanner. See this example: NSString *url = nil; NSString *htmlString = ... NSScanner *theScanner = [NSScanner scannerWithString:htmlString]; // find start of IMG tag [theScanner scanUpToString:@"<img" intoString:nil]; if (![theScanner isAtEnd]) { [theScanner