设置MKUserTrackingModeFollowWithHeading [英] Setting MKUserTrackingModeFollowWithHeading

问题描述

我尝试在viewDidLoad方法（以及viewWillAppear）中设置用户跟踪模式。如果我将其设置为MKUserTrackingModeFollowWithHeading（值为2），则它不会生效。实际上，在将其值设置为2之后，如果我将其打印为值，则为1，为什么？我从未在任何编程经历中看到过这样的事情！

I tried to set the user tracking mode in the viewDidLoad method (and in viewWillAppear). If I set it to MKUserTrackingModeFollowWithHeading (value of 2), it does not take effect. Actually, right after setting its value to 2, if I print it value, it is 1, why? I have never seen such a thing in any programming experience!

以下是我如何设置它：

[self.mapView setUserTrackingMode: MKUserTrackingModeFollowWithHeading 
                         animated: YES];

如果我在viewWillAppear方法中执行相同操作，效果是相同的。但是，第二次显示此视图时，该设置将生效。 （我有一个制表视图控制器，我将视图切换到另一个，然后切换回来）。

If I do the same in the viewWillAppear method, the effect is the same. However, the second time this view is displayed, the setting will take effect. (I have a tab viewcontroller, I switch the view to another and then switch back).

我认为它没有生效的方式有两个措施：（1）在地图视图中设置它（2）后立即打印其值，不显示标题。

The way I see it does not take effect is two measures: (1) print its value right after setting it (2) in the map view, the heading is not displayed.

发生了什么事？

推荐答案

我知道这是一个非常古老的帖子，但为了防止其他人在那里寻找解决方案，原因是因为你需要设置userTrackingMode地图加载后。因此，将您的类设置为委托，然后添加此委托方法：

I know this is a really old post, but just in case it helps others out there looking for a solution, the reason is because you need to set the userTrackingMode after the map has loaded. So set your class as the delegate, then add this delegate method:

- (void)mapViewDidFinishLoadingMap:(MKMapView *)mapView {
    mapView.userTrackingMode = MKUserTrackingModeFollowWithHeading;
}

这篇关于设置MKUserTrackingModeFollowWithHeading的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！