我使用此代码在我的地图上显示我的所有注释:
MKMapRect zoomRect = MKMapRectNull;
for (id <MKAnnotation> annotation in mapView.annotations)
{
MKMapPoint annotationPoint = MKMapPointForCoordinate(annotation.coordinate);
MKMapRect pointRect = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0, 1000);
if (MKMapRectIsNull(zoomRect)) {
zoomRect = pointRect;
} else {
zoomRect = MKMapRectUnion(zoomRect, pointRect);
}
}
[mapView setVisibleMapRect:zoomRect animated:YES];
但我的问题是,当注释彼此接近时,由于矩形很小,它会缩放太多。
有什么方法可以解决这个问题吗?
答案 0 :(得分:7)
在我的代码中,我添加了额外的间距,因此它会自动调整缩放级别以适应。
[aMapView setVisibleMapRect:zoomRect edgePadding:UIEdgeInsetsMake(-100, -50, -50, -50) animated:YES];
答案 1 :(得分:1)
Ariel的回答对我不起作用,但我对它做了一些小改动,现在效果很好(特别是对于带有单个引脚的地图):
double minimumZoom = 6000; // for my purposes the width/height have same min zoom
BOOL needChange = NO;
double x = MKMapRectGetMinX(zoomRect);
double y = MKMapRectGetMinY(zoomRect);
double w = MKMapRectGetWidth(zoomRect);
double h = MKMapRectGetHeight(zoomRect);
double centerX = MKMapRectGetMidX(zoomRect);
double centerY = MKMapRectGetMidY(zoomRect);
if (h < minimumZoom) { // no need to call MKMapRectGetHeight again; we just got its value!
// get the multiplicative factor used to scale old height to new,
// then apply it to the old width to get a proportionate new width
double factor = minimumZoom / h;
h = minimumZoom;
w *= factor;
x = centerX - w/2;
y = centerY - h/2;
needChange = YES;
}
if (w < minimumZoom) {
// since we've already adjusted the width, there's a chance this
// won't even need to execute
double factor = minimumZoom / w;
w = minimumZoom;
h *= factor;
x = centerX - w/2;
y = centerY - h/2;
needChange = YES;
}
if (needChange) {
zoomRect = MKMapRectMake(x, y, w, h);
}
[mapView setVisibleMapRect:zoomRect animated:YES];
答案 2 :(得分:1)
Ariel的解决方案对我也不起作用,但是n00neimp0rtant的解决方案却对我不起作用。我已经在Swift中将其重写为MKMapRect扩展中的函数rectWithMinimumZoom(_ minimumZoom: Double)
。作为回报,它是调整后的矩形(如果需要调整)。另外,我还添加了一个额外的安全性,即minimumZoom不能除以0。
SWIFT
extension MKMapRect {
func rectWithMinimumZoom(_ minimumZoom: Double = 750) -> MKMapRect{
var needChange = false
var x = MKMapRectGetMinX(self)
var y = MKMapRectGetMinY(self)
var w = MKMapRectGetWidth(self)
var h = MKMapRectGetHeight(self)
let centerX = MKMapRectGetMidX(self)
let centerY = MKMapRectGetMidY(self)
if(h < minimumZoom){
let factor = minimumZoom / max(h,1)
h = minimumZoom
w *= factor;
x = centerX - w / 2
y = centerY - h / 2
needChange = true
}
if(w < minimumZoom){
let factor = minimumZoom / max(w,1)
w = minimumZoom
h *= factor
x = centerX - w / 2
y = centerY - h / 2
needChange = true
}
if(needChange){
return MKMapRectMake(x, y, w, h);
}
return self
}
答案 3 :(得分:0)
试试这段代码:
//here comes your for loop...
double minMapHeight = 10; //choose some value that fit your needs
double minMapWidth = 10; //the same as above
BOOL needChange = NO;
double x = MKMapRectGetMinX(zoomRect);
double y = MKMapRectGetMinY(zoomRect);
double w = MKMapRectGetWidth(zoomRect);
double h = MKMapRectGetHeight(zoomRect); //here was an error!!
if(MKMapRectGetHeight(zoomRect) < minMapHeight){
x -= minMapWidth/2;
w += minMapWidth/2;
needChange = YES;
}
if(MKMapRectGetWidth(zoomRect) < minMapWidth){
y -= minMapHeight/2;
h += minMapHeight/2;
needChange = YES;
}
if(needChange){
zoomRect = MKMapRectMake(x, y, w, h);
}
[mapView setVisibleMapRect:zoomRect animated:YES];
double minMapHeight = 250; //choose some value that fit your needs
double minMapWidth = 250; //the same as above
BOOL needChange = NO;
double x = MKMapRectGetMinX(zoomRect);
double y = MKMapRectGetMinY(zoomRect);
double w = MKMapRectGetWidth(zoomRect);
double h = MKMapRectGetHeight(zoomRect);
double centerX = MKMapRectGetMidX(zoomRect);
double centerY = MKMapRectGetMidY(zoomRect);
if(MKMapRectGetHeight(zoomRect) < minMapHeight){
//x -= minMapWidth/2;
//w += minMapWidth/2;
x = centerX - w/2;
needChange = YES;
}
if(MKMapRectGetWidth(zoomRect) < minMapWidth){
//y -= minMapHeight/2;
//h += minMapHeight/2;
y = centerY - h/2;
needChange = YES;
}
if(needChange){
zoomRect = MKMapRectMake(x, y, w, h);
}
[mapView setVisibleMapRect:zoomRect animated:YES];
答案 4 :(得分:0)
对于那些喜欢一只内胆的人:
let minRectSize: Double = 5000
zoomRect = MKMapRect(
x: zoomRect.minX - max(0, minRectSize - zoomRect.width) / 2,
y: zoomRect.minY - max(0, minRectSize - zoomRect.height) / 2,
width: max(zoomRect.width, minRectSize),
height: max(zoomRect.height, minRectSize))