In the apple document, I can see that there's a way to convert from UTF8 string to ASCII string like this NSData *asciiData = [theString dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES]; NSString *asciiString = [[NSString alloc] initWithData:asciiData encoding:NSASCIIStringEncoding]; But my app requires a TIS-620 stri...
Occasionally I find code which tests if two NSStrings are the same like this: if ([str1 compare:str2] == NSOrderedSame) { // Do something } Now, I believe this is less readable than using isEqualToString: and it also has some nasty side effects, like if str1 == nil the if(..) evaluates to true, or when str2 == nil havoc might brea...
Is it possible to extract a number from a string. For example, I have a string: my name is shishir and my number is 98890876478 Can I extract on 98890876478 from the above string? Or if my string is: my name is shishir and my number is XXX98890876478XXX In this condition can I extract `98890876478", which is in between of XXX. Is...
I frequently see a code snippet like this in class instance methods: static NSString *myString = @"This is a string."; I can't seem to figure out why this works. Is this simply the objc equivalent of a #define that's limited to the method's scope? I (think) I understand the static nature of the variable, but more specifically about ...
I'm stuck at one of the last parts of my iApp, can someone help me? I want to add different field entries of different .m files into one file without overwriting the file. (I also dont know how to make that save file btw). I have 2 .h files with : file1 : NSString *dataHML; NSString *dataHML2; file2 : NSString *dataHML3; ...
Hi everyone, I have been working on a simple text editor in Cocoa/Objective-C for a practice project and I have come across an error that I would never have expected. I have an NSString for my file's contents as well as an NSString for it's path. When I attempt to write the contents to a file, I use the following method: [FileContents...
I need to determine whether a string (sourceString) contains another string (queryString) and if it does, at what offset. I'm guessing that NSScanner might do the trick but I don't fully understand the documentation. Let's say sourceString = @"What's the weather in London today?" If I set queryString to equal @"What's the weather", I...
I have in the .h file : NSString *dataHML; NSString *dataHML2; NSString *dataHML3; NSString *dataHML4; NSString *dataHML5; NSString *dataHML6; NSString *dataHMLtotal; in the .m file i merge them with : NSString *dataHtmlTotal = [NSString stringWithFormat:@"%@%@%@%@%@%@", dataHtml, dataHtml2, dataHtml3, dataHtml4,dataHtml5,dataHtml6]...
Just doing some research on searching for a character or word within a NSString and I came across this code snippet (which works like a charm): return [sourceString rangeOfString:searchString].location != NSNotFound; Am I right in thinking that the above code is functionally identical to: NSRange range = [sourceString rangeOfString:s...
My app is riddled with memory leaks concerning NSString objects. Never, ever do I use alloc to create an NSString object, yet according to Instruments (used with a real device) the app leaks NSString objects. This happens around uses of stringByAppendingString. Example of code: NSString *documentsPathPlusSlash = [self.documentsPath stri...
Hi, i wrote the following code : NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil]; NSString *json_string = [[NSString alloc] initWithData:response encoding:NSUTF8StringEncoding]; NSDictionary *reportDic = [jsonparser objectWithString:json_string error:nil]; NSDictionary *reporttable = ...
If I call "[NSString stringWithFormat:@"Testing \n %@",variableString]"; I get what I would expect, which is Testing, followed by a new line, then the contents of variableString. However, if i try NSString *testString = @"Testing \n %@"; //forgive shorthand here [NSString stringWithFormat,testString,variableString] the output actually ...
If I have a class/object like this #import <Foundation/Foundation.h> @interface anObject : NSObject { NSString *aProp; } @property NSString aProp; @end and in the cellForRowAtIndexPath method i want to assign one of the string values from its properties to a uilabel of a tableviewcell, how do i do it? I've tried this but it do...
Hey, my question is a performance question. I need to split a huge NSString into coordinates. The string has this format: @"coordx,coordy coordx,coordy coordx,coordy (...)" My method to parse this is: -(NSMutableArray*) parsePath:(NSString*) pathString { // first split between the coordinates NSArray* path = [pathString com...
I have a routine that parses text via a loop. At the end of each record I need to clear my string variables but I read that someString = @"" actually just points to a new string & causes a memory leak. What is the best way to handle this? Should I rather use mutable string vars and use setString:@"" between iterations? ...
I have a UITextView in which I want the initial value to be "@username " when they keyboard shows up (notice the space after the username). This way the user can start typing right away without having to tap space. So I do: textView.text = [NSString stringWithFormat:@"@%@ ", username]; But it seems like it's impossible to have the UIT...
Hi, I am working on an iPhone OS application that sends an xml request to a webservice. In order to send the request, the xml is added to an NSString. When doing this I have experienced some trouble with quotation marks " and backslashes \ in the xml file, which have required escaping. Is there a complete list of characters that need to...
I have two lines of code in the applicationDidFinishLaunching function: NSString *targetFilePath = @"/Users/bob/Documents/About_Stacks.pdf"; NSURL *targetFileURL = [NSURL initFileURLWithPath:targetFilePath]; and I am getting the warning (title) in the second line... I have no idea what I am doing wrong. This is an absurdly simply app...
Hey. I'm trying to format a date from a string into another format. For example: 2012-05-29 23:55:52 into 29/05 *newline* 2010. I just don't get the logics behind NSDate and NSDateFormatter, I think.. Any help will be appreciated. Thanks :) ...
I'm trying to create a simple custom UIView wich contain a string drawn with a single font, but where the first character is slightly larger. I thought this would be easily implemented with two UILabel:s placed next to eachother. I use NSString sizeWithFont to measure my string to be able to lay it out correctly. But I noticed that th...