Why is this Swift code getting errors?

Question

I am presently working on a first Swift project, and making a newcomer's errors.

The class I am working on is meant to export three of its methods to global variables:

var getAngle:[AnyObject]!; var getHours:[AnyObject]! var getMinutes:[AnyObject]!; class GpsViewController : UIViewController { // .... required init() { // super.init(); formatter.dateFormat = "yyyy-MM-dd"; parser.locale = NSLocale(localeIdentifier: "en_US_POSIX"); parser.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZZZZ"; getAngle = self.restrictToAngle; getHours = self.restrictToHours; getMinutes = self.restrictToMinutes; } func getHourAndAngle() { // Hour hand angle in radians from 12 o'clock position, clockwise. var now = NSDate(); var today = now; var todayFormatted = this.formatter(today); var yesterday = today.dateWithTimeIntervalSinceNow(-24 * 60 * 60); var yesterdayFormatted = this.formatter(yesterday); var tomorrow = today.dateWithTimeIntervalSinceNow(24 * 60 * 60); var tomorrowFormatted = this.formatter(tomorrow); var yesterdaySunset = this.presentLocation[yesterdayFormatted]["sunset"]; var todaySunrise = this.presentLocation[todayFormatted]["sunrise"]; var todaySunset = this.presentLocation[todayFormatted]["sunset"]; var tomorrowSunrise = this.presentLocation[tomorrowFormatted]["sunrise"]; var duration = 0.0; var position = 0.0; var startingHour = 18; var offset = 0.0; if now.isLessThanDate(todaySunrise) { length = todaySunrise.timeIntervalSinceDate(yesterdaySunset); position = now.timeIntervalSinceDate(yesterdaySunset); offset = -0.5; } else if now.isLessThanDate(todaySunset) { length = todaySunset.timeIntervalSinceDate(todaySunrise); position = now.timeIntervalSinceDate(todaySunrise); offset = 0.5; startingHour = 6; } else { length = tomorrowSunrise.timeIntervalSinceDate(todaySunset); position = now.timeIntervalSinceDate(todaySunset); offset = 1.5; } var proportion = position / length; var angle = M_PI + (2 * M_PI * (proportion + offset)); var hours = floor(24 * 60 * 60 * ((1 + proportion + offset) % 1.0) / (60 * 60)); var minutes = floor(24 * 60 * 60 * (1 + proportion + offset) % 60 * 60); return ["angle": angle, "hour": hour, "minutes": minutes]; } func restrictToHours() { return getHoursMinutesAngle["hour"]; } func restrictToAngle() { return getHoursMinutesAngle["angle"]; } func restrictToMinutes() { return getHoursMinutesAngle["minutes"]; } // ... }

I'm getting several errors, including in init()'s assignment of getAngle, "Value of type GpsViewController has no member restrictToAngle".

Could you tell me what the n00b errors are here?

At least you have to declare a return type in the 3 functions at the bottom as they clearly return something. — vadian
– vadian, Commented Nov 21, 2015 at 15:45
1. What is this? 2. Your returning methods are missing a return signature. 3. You're assigning methods, not calling them. — Eric Aya
– Eric Aya, Commented Nov 21, 2015 at 15:46
Yes, it is JavaSwift, and I"m working on knowing how to simply use Swift. — Christos Hayward
– Christos Hayward, Commented Nov 21, 2015 at 16:41
@EricD. What does an appropriate return signature look like? I looked around and couldn't track it down. — Christos Hayward
– Christos Hayward, Commented Nov 21, 2015 at 16:45

Vatsal · Accepted Answer · 2015-11-21 15:37:35Z

1

You are trying to assign a function self.restrictToAngle to getAngle, a variable of type [AnyObject]! (i.e. an array).

answered Nov 21, 2015 at 15:37

Vatsal

18.3k11 gold badges48 silver badges83 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

R P · Accepted Answer · 2015-11-21 16:58:59Z

As @EricD and others pointed out, there are quite a lot of issues. For understanding how function definition, calls & return type work in swift, check this Apple documentation page.

Collectives™ on Stack Overflow

Why is this Swift code getting errors?

2 Answers 2

Comments

Comments

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Related