ios - 为什么这段 Swift 代码会出错？

Question

我目前正在处理第一个 Swift 项目，并犯了新手的错误。

我正在处理的类旨在将其三个方法导出到全局变量:

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"];
    }

    // ...
}

我遇到了几个错误，包括在 init() 的 getAngle 赋值中，“GpsViewController 类型的值没有成员 restrictToAngle”。

你能告诉我这里的 n00b 错误是什么吗？

Answer 1

您正在尝试将函数 self.restrictToAngle 分配给 getAngle，这是一个 [AnyObject]! 类型的变量(即数组) .