如何在NSTextField中获取值？

Question

My NSTextField contains doubles like "1.67" or "0.05" etc.

When I try the following:

console.log([priceChange doubleValue]); //priceChange is an NSTextField

    //Apply styles
    if([priceChange doubleValue] > 0)
        [priceChange setTextColor:[NSColor greenColor]];
    else if([priceChange doubleValue] < 0)
        [priceChange setTextColor:[NSColor redColor]];
    else if([priceChange doubleValue] == 0)
        [priceChange setTextColor:[NSColor blackColor]];

priceChange is equal to 0 always, even when the value is something else. How can I properly get the value of priceChange?

Answer 1

Try [[priceChange stringValue] floatValue] . Also make sure there is nothing other than whitespace before the number in the string, or floatValue will return 0.

Answer 2

This is precisely what NSNumberFormatter is for. Give your field a suitable formatter (easy to add/setup in IB), and -objectValue will start returning an NSNumber .