nsstring

Most (all I've seen) Core Data tutorials use the following code snippet with @"MyEntityClass" hard-coded in: NSFetchRequest *request = [[NSFetchRequest alloc] initWithEntityName:@"MyEntityClass"]; Is it safe to use NSStringFromClass() as an Entity Name? NSFetchRequest *request = [[NSFetchRequest alloc] initWithEntityName:NSStringFromClass([MyEntityClass class])]; This seams to be much easer to deal with regarding refactoring and the like. Especially since I am having Xcode create my NSManagedObject subclasses. I ask because I have never seen this before, so perhaps I am missing something. Yes,

How do you print out leading zeros for a float using the NSString type? Input: 3.14 Desired output: 03.1 Using format @"%02.1f" Output: 3.1 imaginaryboy You want @"04.1f" . The 4 is the total width. As you can see from the documentation , the format strings conform to the IEEE printf specification . The format string you've specified breaks down as follows: 0 -- Pad with zeros. 2 -- The entire resulting formatted value will have a minimum width of 2. .1 -- Precision of 1 digit following the decimal point. For some reason you can't set the pre-decimal width on float numbers (maybe it's a bug

I am simply writing the following code for testing purpose: NSString *aStr = [[NSString alloc] initWithFormat:@"Foo"]; aStr = [aStr initWithFormat:@"Bar"];//Crashed here I am getting the following error: *** initialization method -initWithFormat:locale:arguments: cannot be sent to an abstract object of class __NSCFString: Create a concrete instance! If i write the following code same thing happen NSString *aStr = [NSString alloc]; aStr = [aStr initWithFormat:@"Foo"]; aStr = [aStr initWithFormat:@"Bar"]; //Crashed here By google I come to know that initWithFormat will return the NSCFString

I am trying to take the contents of a UITextField that may contain special characters and emojis and turn it into something I can pass in a GET request to a PHP service. If I do not encode the string at all, the emojis show up just fine (I can see them in the DB and they come back to me properly)... but if I add special chars (~!@#$%, etc.) the GET request chokes. So I run the string through the url encoder: [commentText stringByAddingPercentEscapesUsingEncoding:NSNonLossyASCIIStringEncoding]; I am using the NSNonLossyASCIIStringEncoding to get the emojis out properly, which works, but using

i tried following codes for converting a NSData to hex string values but all are wrong? here "result" is my NSdata i need a hex string as output but iam not getting that NSUInteger dataLength = [result length]; NSLog(@"%d",dataLength); NSMutableString *string = [NSMutableString stringWithCapacity:dataLength*2]; const unsigned char *dataBytes = [result bytes]; for (NSInteger idx = 0; idx < dataLength; ++idx) { [string appendFormat:@"%02x", dataBytes[idx]]; } NSLog(@"%@",string); how can i convert this please UPDATES: the result data contains encrypted string .i want to convert this to hex

This is a basic example that I know can be simplified, but for testing sake, I would like to do this in such a way. I want to set a variable based on an appending string (the variables "cam0" and "pos1" are already declared in the class). The appending string would essentially be an index, and i would iterate through a loop to assign cameras (cam0, cam1..) to different positions (pos0, pos1..). cam0 is defined as an UIImageView pos1 is defined as a CGRect This works for a NSString Variable named coverIndex: NSString* text = [[NSString alloc] initWithString:@""]; NSLog(@"%@",(NSString *)[self

I am trying to create a structure that has several different variable of different types in it. several of the types are of NSString, but trying to do this was causing an error ARC forbids Objective-C objects in structs or unions so having read about the error I see its sensible to add __unsafe_unretained before the NSString declaration, However I have no idea what the ramifications of this will be, I have had a quick read around and found this detailed post about the differences of __strong __weak __unsafe_unretained however it was still abit vague about whats going on with a NSString thats

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 ₩ (Korean Won) using the unicode value (0x20A9) or even using UTF8 representation (\xe2\x82\xa9), but