cgfloat

Coding in Swift and get the above error... Is the message masking something else OR can you really not add two CGFloat operands? If not, why (on earth) not? EDIT There is nothing special in the code I am trying to do; what is interesting is that the above error message, VERBATIM, is what the Swift assistant compiler tells me (underlining my code with red squiggly lines). Running Xcode 6.3 (Swift 1.2) It's absolutely possible, adding two CGFloat variables using the binary operator '+'. What you need to know is the resultant variable is also a CGFloat variable (based on type Inference Principle)

This is my current way of converting a CGFloat to String in Swift: let x:Float = Float(CGFloat) let y:Int = Int(x) let z:String = String(y) Is there a more efficient way of doing this? You can use string interpolation : let x: CGFloat = 0.1 let string = "\(x)" // "0.1" Or technically, you can use the printable nature of CGFloat directly: let string = x.description The description property comes from it implementing the Printable protocol which is what makes string interpolation possible. The fast way: let x = CGFloat(12.345) let s = String(format: "%.3f", Double(x)) The better way, because it

Possible Duplicates: Objective-C - float checking for nan Determine if NSNumber is NaN I have a problem with NaN values in CGFloat, how can I check if the number is valid? the only way so far that works is: if ([[NSString stringWithFormat:@"%f", output] isEqualToString:@"nan"]) { output = 0; } which is not a nice solution at all! :) ... and I am pretty sure that there is something else I should do instead. There is a define for checking if a number is nan inf etc in math.h (you can use it without import I think). isnan(myValue) if you follow the define you will end up with (x!=x) there are

When using an iPhone Objective C method that accepts CGFloat s, e.g. [UIColor colorWithRed:green:blue:] , is it important to append a f to constant arguments to specifiy them explicitly as floats, e.g. should I always type 0.1f rather than 0.1 in such cases? Or does the compiler automatically cast 0.1 (which is a double in general) to 0.1f (which is a float) at compile time? I don't wish to have these casts happen at run time because they would unneccessarily hog performance. Thanks in advance MrMage It's not important ; it won't break anything to use a double-precision constant where a single

I am having the same problem as earlier with a different line of code; but this time, I wasn't able to fix it with the same approach as last time: var Y : Int = 0 var X : Int = 0 @IBOutlet var ball : UIImageView! ball.center = CGPointMake(ball.center.x + X, ball.center.y + Y) This is the error I am getting: binary operator + cannot be applied to operands of type CGfloat int Declare them, instead, as the following: let X : CGFloat = 0.0 let Y : CGFloat = 0.0 Replying to your comment: The error has nothing to do with them being declared as var or let . You could declare them as var and if you so