nsnumber

I have a double in an NSNumber . double myDouble = 1363395572.6129999; NSNumber *doubleNumber = @(myDouble); // using [NSNumber numberWithDouble:myDouble] leads to the same result This is where it gets problematic. doubleNumber.doubleValue seems to return the correct and full value (1363395572.6129999) However, looking at doubleNumber in the debugger or doing doubleNumber.description gives me (1363395572.613) . I would understand if perhaps this was just some display formatting, but when I then stick this object into a JSON payload, the messed up rounded value gets inserted instead of the

I got stuck in another problem again but after a long time. This time I have database (Core Data), having an attribute of numbers which contains integer numbers like 213879,123,4,345,56567 and so. I need to fetch data in ascending number order similar to like alphabetically order. I am doing this in way given below, fetchRequest.sortDescriptors=[NSArray arrayWithObject: [NSSortDescriptor sortDescriptorWithKey:@"numbers" ascending:YES selector:@selector(compare:)]]; but unfortunately it compares only the 1st digit of every number, mean if there are 2 numbers like 123 and 321 , it will compare 1

So essentially my question is this, I am creating an NSMutableDictionary using uint64_t objects as the key. Is there any better way to create them than doing this? uint64_t bob=7; NSNumber *bobsNumber; #if __LP64__ || TARGET_OS_EMBEDDED || TARGET_OS_IPHONE || TARGET_OS_WIN32 || NS_BUILD_32_LIKE_64 bobsNumber=[NSNumber numberWithUnsignedLong:bob]; #else bobsNumber=[NSNumber numberWithUnsignedLongLong:bob]; #endif This would work as long as you didn't include it in a binary file/sockets/NSData object/whatever. But is there any better way of doing this? I really would like to be sure that the

I have a UInt16 variable that I would like to pass to a legacy function that requires an NSNumber. If I try: var castAsNSNumber : NSNumber = myUInt16 I get a compiler error 'UInt16' is not convertible to 'NSNumber' Question How can I recast this as an NSNumber? var castAsNSNumber = NSNumber(unsignedShort: myUInt16) 来源： https://stackoverflow.com/questions/24134716/how-to-cast-from-uint16-to-nsnumber

In my app, I accidentally used "==" when comparing two NSNumber objects like so: NSNumber *number1; NSNumber *number2; Later on, after these objects' int values were set, I accidentally did this: if (number1 == number2) { NSLog(@"THEY'RE EQUAL"); } And, confusingly, it worked! I could have sworn I was taught to do it this way: if (number1.intValue == number2.intValue) { NSLog(@"THEY'RE EQUAL"); } How did using "==" between the two NSNumber objects work, and why? Does that mean it's okay to compare them that way, or was it just a fluke and this is generally not guaranteed to work every time? It