Question

我正在与iBeacons合作，并希望在用户靠近iBeacon时显示警报。为此我做了：

for closest in beacons as! [CLBeacon] {
        if closest.major == 4660 && closest.minor == 4648 {
            var customIcon:UIImage! = UIImage(named: "location2.png")
            var customColor:UIColor! = UIColor(red: 63/255.0, green: 172/255.0, blue: 236/255.0, alpha: 1)

            var alert = JSSAlertView().show(
                self,
                title: "You're near the beacon!",
                buttonText: "Dismiss",
                color: customColor,
                iconImage: customIcon
            )
            alert.setTextTheme(.Light)
        }
    }

它有效，但问题是它多次显示，一个接一个，用户无法解除此警报。这是因为我的应用每秒都会更新ibeacon的位置以寻找新的ibeacons。

我可以一次显示此提醒吗？

我做下一个：

        var flag = 0
        if flag == 0 {
            var alert = JSSAlertView().show(
                self,
                title: "You're near the beacon!",
                buttonText: "Dismiss",
                color: customColor,
                iconImage: customIcon
            )
            alert.setTextTheme(.Light)
        }

但它也不起作用

Answer 1

对不起，似乎我忽略了每当范围改变时调用locationManager(_:didRangeBeacons:inRegion:)的事实。因此，如果您希望在向类添加属性后发生警报

var isShowing:Bool = false

然后调整代码以考虑布尔值

for closest in beacons as! [CLBeacon] { 
    if (closest.major == 4660 && closest.minor == 4648) && isShowing == false {    
        var customIcon:UIImage! = UIImage(named: "location2.png") 
        var customColor:UIColor! = UIColor(red: 63/255.0, green: 172/255.0, blue: 236/255.0, alpha: 1) 

        var alert = JSSAlertView().show( 
                        self, 
                        title: "You're near the beacon!", 
                        buttonText: "Dismiss", 
                        color: customColor, 
                        iconImage: customIcon 
                    ) 
        alert.setTextTheme(.Light) 
        isShowing = true 
        break
    } 
}

Answer 2

这是对@ cream-corn代码的编辑

 var shouldShow = true
    for closest in beacons as! [CLBeacon] {
        if closest.major == 4660 && closest.minor == 4648 {

           break
        }
    }
    if (shouldShow == true) {
        var customIcon:UIImage! = UIImage(named: "location2.png")
        var customColor:UIColor! = UIColor(red: 63/255.0, green: 172/255.0, blue: 236/255.0, alpha: 1)

        var alert = JSSAlertView().show(
                self,
                title: "You're near the beacon!",
                buttonText: "Dismiss",
                color: customColor,
                iconImage: customIcon
            )
        alert.setTextTheme(.Light)
        shouldShow = false
    }

Answer 3

您使用flag进入正确的轨道。但是如果你将var flag = 0放在那个方法中，那么flag总是为0 你必须在类中声明flag，而不是像这样的函数：

class myClass {
var flag = 0
    func myFunction() {
        /*more code here...*/
        if flag == 0 {
            var alert = JSSAlertView().show(
                self,
                title: "You're near the beacon!",
                buttonText: "Dismiss",
                color: customColor,
                iconImage: customIcon
            )
            alert.setTextTheme(.Light)
        }
    }
}

如何在Swift中一次显示警报？

3 个答案: