nsnumber - w3toppers.com

NSNumber of seconds to Hours, minutes, seconds

Have you tried creating an NSDate from that and printing that using an NSDateFormatter? NSDate *date = [NSDate dateWithTimeIntervalSince1970:[theNumber doubleValue]]; NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; [formatter setDateFormat:@”HH:mm:ss”]; NSLog(@”%@”, [formatter stringFromDate:date]); [formatter release]; If you need the individual values for hours, minutes, and seconds, use NSDateComponents as suggested by nall. The above won’t print the … Read more

Is there a correct way to determine that an NSNumber is derived from a Bool using Swift?

You can ask the same question for Objective-C, and here is an answer in Objective-C – which you can call from, or translate into, Swift. NSNumber is toll-free bridged to CFNumberRef, which is another way of saying an NSNumber object is in fact a CFNumber one (and vice-versa). Now CFNumberRef has a specific type for … Read more

Determine if NSNumber is NaN

So, I found out that the class property [NSDecimalNumber notANumber] is just for this purpose. In some languages NaN != NaN, but this isn’t the case in Cocoa.

iOS convert large numbers to smaller format

-(NSString*) suffixNumber:(NSNumber*)number { if (!number) return @””; long long num = [number longLongValue]; int s = ( (num < 0) ? -1 : (num > 0) ? 1 : 0 ); NSString* sign = (s == -1 ? @”-” : @”” ); num = llabs(num); if (num < 1000) return [NSString stringWithFormat:@”%@%lld”,sign,num]; int exp = … Read more

Comparing NSNumbers in Objective C

I assume number1 and number2 are pointers to objects. The < sign is comparing the pointers. You need to compare the actual floatValue or doubleValue if ([number1 doubleValue] < [number2 doubleValue]) ….

How to add two NSNumber objects?

There is not really a better way, but you really should not be doing this if you can avoid it. NSNumber exists as a wrapper to scalar numbers so you can store them in collections and pass them polymorphically with other NSObjects. They are not really used to store numbers in actual math. If you … Read more

How to convert NSNumber to NSString

Try: NSString *myString = [NSNumber stringValue];

get type of NSNumber

I recommend using the -[NSNumber objCType] method. It allows you to do: NSNumber * n = [NSNumber numberWithBool:YES]; if (strcmp([n objCType], @encode(BOOL)) == 0) { NSLog(@”this is a bool”); } else if (strcmp([n objCType], @encode(int)) == 0) { NSLog(@”this is an int”); } For more information on type encodings, check out the Objective-C Runtime Reference.

Is it possible to replicate Swifts automatic numeric value bridging to Foundation (NSNumber) for (U)Int8/16/32/64 types?

Yes (it’s possible): by conformance to protocol _ObjectiveCBridgeable (The following answer is based on using Swift 2.2 and XCode 7.3.) Just as I was pondering over whether to post or simply skip this question, I stumbled over swift/stdlib/public/core/BridgeObjectiveC.swift in the Swift source code, specifically the protocol _ObjectiveCBridgeable. I’ve briefly noticed the protocol previously at Swiftdoc.org, … Read more

Objective-C: Find numbers in string

Here’s an NSScanner based solution: // Input NSString *originalString = @”This is my string. #1234″; // Intermediate NSString *numberString; NSScanner *scanner = [NSScanner scannerWithString:originalString]; NSCharacterSet *numbers = [NSCharacterSet characterSetWithCharactersInString:@”0123456789″]; // Throw away characters before the first number. [scanner scanUpToCharactersFromSet:numbers intoString:NULL]; // Collect numbers. [scanner scanCharactersFromSet:numbers intoString:&numberString]; // Result. int number = [numberString integerValue]; (Some of … Read more