regiondidchange在app load swift上多次调用 [英] regiondidchange called several times on app load swift

问题描述

我有一张地图，当我平移或输入位置并导航到它时，我想要一个简单的打印功能运行。我已经完成了这项工作，但是，当我第一次加载应用程序时，它会多次调用该打印函数，直到它完成放大。有没有办法不计算应用程序加载区域更改的初始值？

I have a map that when i pan away or type in a location and navigate to it that I want a simple print function to run. I have this accomplished, however, when i first load the app it calls that print function several times until it is finished zooming in. Is there a way to NOT count the initial on app load region change?

推荐答案

答案终于在这里找到了http://ask.ttwait.com/que/5556977

answer finally found herehttp://ask.ttwait.com/que/5556977

private var mapChangedFromUserInteraction = false

private func mapViewRegionDidChangeFromUserInteraction() -> Bool {
let view = self.mapView.subviews[0]
//  Look through gesture recognizers to determine whether this region change is from user interaction
if let gestureRecognizers = view.gestureRecognizers {
    for recognizer in gestureRecognizers {
        if( recognizer.state == UIGestureRecognizerState.Began || recognizer.state == UIGestureRecognizerState.Ended ) {
            return true
        }
    }
}
return false
}

func mapView(mapView: MKMapView, regionWillChangeAnimated animated:    
Bool) {
mapChangedFromUserInteraction =   
mapViewRegionDidChangeFromUserInteraction()
if (mapChangedFromUserInteraction) {
    // user changed map region
}
}

func mapView(mapView: MKMapView, regionDidChangeAnimated animated:   
Bool) {
if (mapChangedFromUserInteraction) {
    // user changed map region
}
}

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