MKMapView：setRegion不起作用！ [英] MKMapView : setRegion doesn't work !

问题描述

Aaaarg ......好吧，让我们冷静下来。

Aaaarg... ok, let's calm myself.

有人设置MKMapView的区域有什么问题吗？
它从未与我合作。

Did someone have any problem with setting the region of a MKMapView ? It never worked with me.

此代码：

-(void)setUserCenteredSpan:(MKCoordinateSpan)span{ // for this example, span = {0.5, 0.5}
    // Current region (just initialised)
NSLog(@"%f, %f - %f, %f",   self.region.center.latitude,
                            self.region.center.longitude, 
                            self.region.span.latitudeDelta, 
                            self.region.span.longitudeDelta);
    // New Region
MKCoordinateRegion region = MKCoordinateRegionMake([[[self userLocation] location] coordinate],
                                                   span);
NSLog(@"%f, %f - %f, %f",   region.center.latitude,
                            region.center.longitude, 
                            region.span.latitudeDelta, 
                            region.span.longitudeDelta);
    // Region saved in MKMapView
[self setRegion:region animated:NO];
NSLog(@"%f, %f - %f, %f",   self.region.center.latitude,
                            self.region.center.longitude, 
                            self.region.span.latitudeDelta, 
                            self.region.span.longitudeDelta);
}

返回该日志：

30.145127, -40.078125 - 0.000000, 0.000000
0.000000, 0.000000 - 0.500000, 0.500000
0.000000, 0.000000 - 0.000000, 0.000000

你知道为什么??！

非常感谢，你可以保存我杀了自己X（

Thanks a lot, you can save me from killing myself X(

Mart

编辑：当然，我在设备上，连接到互联网。

EDIT : Of course, I am on the device, connected to internet.

推荐答案

我完全不了解以前的日志，但我知道我的错误在哪里。

I don't understand exactly the previous logs, but I know where was my error.

实例化的MKMapView没有用框初始化，但autoresizingMask设置为> 0.

The instancied MKMapView was not initialised with a frame, but with an autoresizingMask set to > 0.

调用setRegion方法时，我的视图还没有框架。我认为区域值是根据视图帧计算的，所以找不到这些值。

When the setRegion method was called, my view was not framed yet. I think the region values are calculated according to the view frame, so these values couldn't be found.

只需设置之前的帧做一个setRegion，它会正常显示。

Just set the frame before doing a setRegion, and it would display normally.

B你好！

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