MKMapview中的设置区域已经关闭了1.6倍

问题描述：

-(void) setTheMapViewRegionBasedonCurrentAnchorandDistance 
{ 
    //PD([BNUtilitiesQuick MaxDistanceOnSearch]); 
    //self.theMapView.centerCoordinate = [cachedProperties singleton].currentAnchor.coordinate; 
    //self.theMapView.region.span.longitudeDelta=[BNUtilitiesQuick MaxDistanceOnSearch]*safetyMarginForMap; 
    double ratio = self.theMapView.frame.size.height/self.theMapView.frame.size.width; 
    //double ratio = self.theMapView.visibleMapRect.size.height/self.theMapView.visibleMapRect.size.width; 
    PD([BNUtilitiesQuick MaxDistanceOnSearch]); 
    double distanceFromEastAndWestShyouldBe = [BNUtilitiesQuick MaxDistanceOnSearch]*ratioBetweenEastWestToDistanceFilter; 
    PD(distanceFromEastAndWestShyouldBe); 
    self.theMapView.region = MKCoordinateRegionMakeWithDistance([cachedProperties singleton].mapCenterLocation.coordinate,distanceFromEastAndWestShyouldBe, distanceFromEastAndWestShyouldBe); 
    PD(self.DistanceBetweenWestandEast); 
    PD(ratio); 
}

查看该代码。我将MKMapview区域设置为distanceFromEastAndWestShyouldBe的数量。输出是：MKMapview中的设置区域已经关闭了1.6倍

2012-08-10 11:30:13.789 BadgerNew[15438:17003] <0x874d0b0 GoogleMap.m:(394)> [BNUtilitiesQuick MaxDistanceOnSearch]: 193.690170 
2012-08-10 11:30:13.789 BadgerNew[15438:17003] <0x874d0b0 GoogleMap.m:(396)> distanceFromEastAndWestShyouldBe: 464.856409 
2012-08-10 11:30:13.790 BadgerNew[15438:17003] <0x874d0b0 GoogleMap.m:(398)> self.DistanceBetweenWestandEast: 761.369705 
2012-08-10 11:30:21.329 BadgerNew[15438:17003] <0x874d0b0 GoogleMap.m:(399)> ratio: 1.437500

基本上我设置地图有464米宽度和地图宽度是761米，而不是。

MKMapview的高度和宽度之比为1.43。这并不重要，因为我在经纬度上使用了较小的数字。

计算东部之间和西部中的MKMapView实际差异的代码是：

-(double)DistanceBetweenWestandEast  
{ 
    CLLocationDegrees longitudeDelta=self.theMapView.region.span.longitudeDelta; 
    double distanceeastwest = longitudeDelta * MetersIn1DegreeofEarth; 
    return distanceeastwest;  
}

与

#define MetersIn1DegreeofEarth 110882.5

定义其他

某处的解决办法是简单地由1.6之前分改变mapview区域。但是，我想知道为什么它首先关闭。

答

我发现了问题所在：

我写了这个代码：

for (int i=100;i<10000;i=i*1.1) 
    { 
     distanceWereInputing = i; 
     self.theMapView.region = MKCoordinateRegionMakeWithDistance([cachedProperties singleton].mapCenterLocation.coordinate,distanceWereInputing, distanceWereInputing); 
     PD(distanceWereInputing); 
     PD(self.DistanceBetweenWestandEast); 
     PD(self.DistanceBetweenWestandEast/distanceWereInputing); 
    }

这是结果：

2012-08-10 12:33:33.935 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(394)> [BNUtilitiesQuick MaxDistanceOnSearch]: 193.690170 
2012-08-10 12:33:33.935 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(396)> distanceFromEastAndWestShyouldBe: 464.856409 
2012-08-10 12:33:50.500 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 100.000000 
2012-08-10 12:33:51.740 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 95.171213 
2012-08-10 12:33:54.042 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 0.951712 
2012-08-10 12:34:02.613 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 110.000000 
2012-08-10 12:34:02.613 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 190.342426 
2012-08-10 12:34:02.614 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.730386 
2012-08-10 12:34:02.614 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 121.000000 
2012-08-10 12:34:02.614 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 190.342426 
2012-08-10 12:34:02.614 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.573078 
2012-08-10 12:34:02.615 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 133.000000 
2012-08-10 12:34:02.615 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 190.342426 
2012-08-10 12:34:02.615 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.431146 
2012-08-10 12:34:02.616 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 146.000000 
2012-08-10 12:34:02.620 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 190.342426 
2012-08-10 12:34:02.620 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.303715 
2012-08-10 12:34:02.621 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 160.000000 
2012-08-10 12:34:02.621 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 190.342426 
2012-08-10 12:34:02.621 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.189640 
2012-08-10 12:34:02.622 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 176.000000 
2012-08-10 12:34:02.622 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 190.342426 
2012-08-10 12:34:02.633 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.081491 
2012-08-10 12:34:02.635 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 193.000000 
2012-08-10 12:34:02.635 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 190.342426 
2012-08-10 12:34:02.635 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 0.986230 
2012-08-10 12:34:02.636 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 212.000000 
2012-08-10 12:34:02.636 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 380.684853 
2012-08-10 12:34:02.636 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.795683 
2012-08-10 12:34:02.636 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 233.000000 
2012-08-10 12:34:02.667 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 380.684853 
2012-08-10 12:34:02.667 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.633841 
2012-08-10 12:34:02.668 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 256.000000 
2012-08-10 12:34:02.668 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 380.684853 
2012-08-10 12:34:02.668 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.487050 
2012-08-10 12:34:02.668 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 281.000000 
2012-08-10 12:34:02.669 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 380.684853 
2012-08-10 12:34:02.669 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.354750 
2012-08-10 12:34:02.669 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 309.000000 
2012-08-10 12:34:02.670 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 380.684853 
2012-08-10 12:34:02.670 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.231990 
2012-08-10 12:34:02.671 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 339.000000 
2012-08-10 12:34:02.671 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 380.684853 
2012-08-10 12:34:02.685 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.122964 
2012-08-10 12:34:02.686 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 372.000000 
2012-08-10 12:34:02.686 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 380.684853 
2012-08-10 12:34:02.686 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.023346 
2012-08-10 12:34:02.687 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 409.000000 
2012-08-10 12:34:02.687 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 761.369705 
2012-08-10 12:34:02.687 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.861540 
2012-08-10 12:34:02.687 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 449.000000 
2012-08-10 12:34:02.688 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 761.369705 
2012-08-10 12:34:02.688 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.695701 
2012-08-10 12:34:02.688 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 493.000000 
2012-08-10 12:34:02.688 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 761.369705 
2012-08-10 12:34:02.689 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.544360 
2012-08-10 12:34:02.689 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 542.000000 
2012-08-10 12:34:02.689 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 761.369705 
2012-08-10 12:34:02.689 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.404741 
2012-08-10 12:34:02.690 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 596.000000 
2012-08-10 12:34:02.690 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 761.369705 
2012-08-10 12:34:02.690 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.277466 
2012-08-10 12:34:02.691 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 655.000000 
2012-08-10 12:34:02.691 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 761.369705 
2012-08-10 12:34:02.691 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.162396 
2012-08-10 12:34:02.692 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 720.000000 
2012-08-10 12:34:02.692 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 761.369705 
2012-08-10 12:34:02.692 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.057458 
2012-08-10 12:34:02.692 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 792.000000 
2012-08-10 12:34:02.693 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 1522.739410 
2012-08-10 12:34:02.693 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.922651 
2012-08-10 12:34:02.693 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 871.000000 
2012-08-10 12:34:02.693 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 1522.739410 
2012-08-10 12:34:02.694 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.748266 
2012-08-10 12:34:02.694 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 958.000000 
2012-08-10 12:34:02.694 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 1522.739410 
2012-08-10 12:34:02.694 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.589498 
2012-08-10 12:34:02.695 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 1053.000000 
2012-08-10 12:34:02.695 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 1522.739410 
2012-08-10 12:34:02.695 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.446096 
2012-08-10 12:34:02.695 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 1158.000000 
2012-08-10 12:34:02.703 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 1522.739410 
2012-08-10 12:34:02.703 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.314974 
2012-08-10 12:34:02.704 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 1273.000000 
2012-08-10 12:34:02.704 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 1522.739410 
2012-08-10 12:34:02.704 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.196182 
2012-08-10 12:34:02.705 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 1400.000000 
2012-08-10 12:34:02.705 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 1522.739410 
2012-08-10 12:34:02.705 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.087671 
2012-08-10 12:34:02.706 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 1540.000000 
2012-08-10 12:34:02.706 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 3045.478821 
2012-08-10 12:34:02.706 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.977584 
2012-08-10 12:34:02.707 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 1694.000000 
2012-08-10 12:34:02.707 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 3045.478821 
2012-08-10 12:34:02.707 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.797803 
2012-08-10 12:34:02.707 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 1863.000000 
2012-08-10 12:34:02.708 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 3045.478821 
2012-08-10 12:34:02.708 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.634718 
2012-08-10 12:34:02.708 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 2049.000000 
2012-08-10 12:34:02.708 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 3045.478821 
2012-08-10 12:34:02.709 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.486324 
2012-08-10 12:34:02.709 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 2253.000000 
2012-08-10 12:34:02.709 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 3045.478821 
2012-08-10 12:34:02.710 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.351744 
2012-08-10 12:34:02.710 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 2478.000000 
2012-08-10 12:34:02.710 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 3045.478821 
2012-08-10 12:34:02.710 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.229007 
2012-08-10 12:34:02.711 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 2725.000000 
2012-08-10 12:34:02.711 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 3045.478821 
2012-08-10 12:34:02.711 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.117607 
2012-08-10 12:34:02.712 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 2997.000000 
2012-08-10 12:34:02.712 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 3045.478821 
2012-08-10 12:34:02.712 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.016176 
2012-08-10 12:34:02.713 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 3296.000000 
2012-08-10 12:34:02.713 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 6090.957642 
2012-08-10 12:34:02.713 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.847985 
2012-08-10 12:34:02.714 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 3625.000000 
2012-08-10 12:34:02.714 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 6090.957642 
2012-08-10 12:34:02.714 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.680264 
2012-08-10 12:34:02.714 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 3987.000000 
2012-08-10 12:34:02.715 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 6090.957642 
2012-08-10 12:34:02.715 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.527704 
2012-08-10 12:34:02.715 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 4385.000000 
2012-08-10 12:34:02.715 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 6090.957642 
2012-08-10 12:34:02.716 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.389044 
2012-08-10 12:34:02.716 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 4823.000000 
2012-08-10 12:34:02.716 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 6090.957642 
2012-08-10 12:34:02.716 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.262898 
2012-08-10 12:34:02.717 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 5305.000000 
2012-08-10 12:34:02.717 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 6090.957642 
2012-08-10 12:34:02.717 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.148154 
2012-08-10 12:34:02.718 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 5835.000000 
2012-08-10 12:34:02.718 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 6090.957642 
2012-08-10 12:34:02.718 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.043866 
2012-08-10 12:34:02.719 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 6418.000000 
2012-08-10 12:34:02.719 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 12181.915283 
2012-08-10 12:34:02.719 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.898086 
2012-08-10 12:34:02.719 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 7059.000000 
2012-08-10 12:34:02.720 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 12181.915283 
2012-08-10 12:34:02.720 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.725728 
2012-08-10 12:34:02.720 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 7764.000000 
2012-08-10 12:34:02.720 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 12181.915283 
2012-08-10 12:34:02.721 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.569026 
2012-08-10 12:34:02.721 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 8540.000000 
2012-08-10 12:34:02.721 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 12181.915283 
2012-08-10 12:34:02.721 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.426454 
2012-08-10 12:34:02.722 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(403)> distanceWereInputing: 9394.000000 
2012-08-10 12:34:02.722 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(404)> self.DistanceBetweenWestandEast: 12181.915283 
2012-08-10 12:34:02.722 BadgerNew[16754:17003] <0x88b79b0 GoogleMap.m:(405)> self.DistanceBetweenWestandEast/distanceWereInputing: 1.296776

因此，它看起来像谷歌缩放级别只能拿一定的价值。这就是为什么我们输入的数据与实际的东西距离之间的比率从1.7到0.95不等。

那么我只拿平均1.3，并使用该变化时的MKMapView大小。

你是正确的，该地图将捕捉到预定义的缩放级别，它使瓷砖看起来要好很多。但为什么你需要一个比例？您拥有最大搜索距离的功能，Apple提供了一个设置适合坐标区域的区域的功能。刚切断整个代码下降到这样的：self.theMapView.region = MKCoordinateRegionMakeWithDistance（[cachedProperties单] .mapCenterLocation.coordinate，[BNUtilitiesQuick MaxDistanceOnSearch]，[BNUtilitiesQuick MaxDistanceOnSearch]）; – Craig 2012-08-11 21:21:10

这是另一个令人困惑的部分。 MKMapview的高度和宽度不同。所以如果我给出相同的数据的宽度和高度哪一个将匹配插入的数字？宽度或高度？或者哪个更“少”？ – 2012-08-12 12:14:39

如果你这样做的话，MKMapview将确保你的坐标区域是可见的（如果需要的话，在任何一边加额外）[mapView setRegion：[mapView regionThatFits：region] animated：YES]; – Craig 2012-08-12 15:08:05

答

经线之间的距离随纬度而变化。在赤道上，一度经度为〜111km，但向北或向南75度，一度经度为〜29km。您对东西方距离的计算假定视图位于赤道上。尝试使用CLLocation的distanceFromLocation来考虑纬度。你需要两点。*longitudeDelta/2和中心+ longitudeDelta/2

嗯...有趣。我没有考虑到这一点。尽管我在赤道。 – 2012-08-11 15:35:04

+1。我不认为这是真正的问题，但我认为你让我看到我非常想念的重要一点。 – 2012-08-11 15:38:53

MKMapview中的设置区域已经关闭了1.6倍

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