检查用户位置是否在地图iphone上可见 [英] Check if user location is visible on map iphone

问题描述

我想隐藏或显示UIButton天气用户的当前位置在地图上可见。在测试代​​码xcode时，我可以看到meassage 用户位置视图不可见但应该是。在didUpdateLocation方法中的控制台上显示....如果用户位置是在地图上看不到。如何在我的情况下使用此消息生成事件以隐藏或显示UIButton？
感谢您提前获得任何帮助。

I want to hide or show a UIButton weather user's current location is visible on map. While testing the code xcode I can see meassage "User location view is NOT visible but should be. Showing...." on console in "didUpdateLocation" method if users location is not visible on map. How can I use this message to generate events in my case to hide or show a UIButton? Thanks for any help in advance.

推荐答案

如果您想知道当前是否包含用户位置显示的地图区域，您可以在 regionDidChangeAnimated 委托方法中检查 userLocationVisible 属性：

If you want to know whether the user location is contained in the currently displayed map region, you can check the userLocationVisible property in the regionDidChangeAnimated delegate method:

- (void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated
{
    someButton.hidden = !mapView.userLocationVisible;
}

如果您只是想知道用户位置当前是否有值（是否它是否可见以及showsUserLocation是否打开），然后：

If you just want to know whether the user location currently has a value (whether it's visible or not and whether showsUserLocation is on or not), then:

if (mapView.userLocation.location == nil)
    NSLog(@"user location not obtained yet");
else
    NSLog(@"user location available (may or may not be currently visible)"):

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