Iphone 加载时，MKMapView是否覆盖除视图之外的所有内容？仅限iOS5<；

由于某些原因，我的

MKMapView

有时会得到一个覆盖，在加载时覆盖除视图之外的所有内容。您可以在视图加载后滚动到一侧并查看覆盖。此外，此问题仅存在于ios5及以下版本中，而在ios6中不会出现此问题。我发现，如果放大或缩小地图，地图的覆盖部分将调整到新视图。例如，如果缩小，则地图的非覆盖部分将调整并变大，以适应视图的新大小，但如果随后侧向滚动，则地图仍以viewForOverlay方法中定义的颜色覆盖。我不知道为什么，我已经为此工作了一段时间，而谷歌没有发现任何东西。以下是我的一些代码：

-(MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay {

    if([overlay class] == [MKPolyline class]){
    MKPolylineView *polylineView = [[MKPolylineView alloc] initWithPolyline:overlay];

    int lineSize = [self.ud integerForKey:@"lineSize"];
    polylineView.lineWidth = lineSize;

    NSString *lineColor = [self.ud objectForKey:@"lineColor"];

    if([lineColor isEqualToString:@"Red"]){
        polylineView.strokeColor = [UIColor redColor];
    }else if([lineColor isEqualToString:@"Blue"]){
        polylineView.strokeColor = [UIColor blueColor];
    }else if ([lineColor isEqualToString:@"Orange"]){
        polylineView.strokeColor = [UIColor orangeColor];
    }else if([lineColor isEqualToString:@"Green"]){
        polylineView.strokeColor = [UIColor greenColor];
    }else if([lineColor isEqualToString:@"Black"]){
        polylineView.strokeColor = [UIColor blackColor];
    }
    return polylineView;
    }else{
        MKOverlayView *overlayToReturn = [[MKOverlayView alloc]initWithOverlay:overlay];
        return overlayToReturn;
    }
}

-（MKOverlayView*）地图视图：（MKMapView*）地图视图覆盖：（id）覆盖{
如果（[overlay class]==[MKPolyline class]）{
MKPolylineView*polylineView=[[MKPolylineView alloc]initWithPolyline:overlay]；
int lineSize=[self.ud integerworkey:@“lineSize”]；
polylineView.lineWidth=线宽；
NSString*lineColor=[self.ud objectForKey:@“lineColor”]；
如果（[lineColor IsequalString:@“Red”]）{
polylineView.strokeColor=[UIColor redColor]；
}else if（[lineColor IsequalString:@“Blue”]）{
polylineView.strokeColor=[UIColor blueColor]；
}else if（[lineColor IsequalString:@“Orange”]）{
polylineView.strokeColor=[UIColor orangeColor]；
}else if（[lineColor IsequalString:@“Green”]）{
polylineView.strokeColor=[UIColor greenColor]；
}else if（[lineColor IsequalString:@“Black”]）{
polylineView.strokeColor=[UIColor blackColor]；
}
返回多段线视图；
}否则{
MKOverlayView*overlayToReturn=[[MKOverlayView alloc]initWithOverlay:overlay]；
回归与回归；
}
}

这就是我得到的：

---

我怀疑问题在于您创建的MKPolyline或可能是lineSize设置。这段代码在这里运行良好：

#import <MapKit/MapKit.h>
#import "ViewController.h"

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    MKMapView *map = [[MKMapView alloc] initWithFrame:self.view.bounds];
    map.delegate = self;
    [self.view addSubview:map];

    CLLocationCoordinate2D coords[] = { {42,-83}, {32, -84}, {45,-78}, {42,-83} };
    MKPolyline *overlay = [MKPolyline polylineWithCoordinates:coords count:4];
    [map addOverlay:overlay];
}

-(MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay {

    if([overlay class] == [MKPolyline class]){
    MKPolylineView *polylineView = [[MKPolylineView alloc] initWithPolyline:overlay];

    int lineSize = 2; //[self.ud integerForKey:@"lineSize"];
    polylineView.lineWidth = lineSize;

    NSString *lineColor = @"Red"; // [self.ud objectForKey:@"lineColor"];

    if([lineColor isEqualToString:@"Red"]){
        polylineView.strokeColor = [UIColor redColor];
    }else if([lineColor isEqualToString:@"Blue"]){
        polylineView.strokeColor = [UIColor blueColor];
    }else if ([lineColor isEqualToString:@"Orange"]){
        polylineView.strokeColor = [UIColor orangeColor];
    }else if([lineColor isEqualToString:@"Green"]){
        polylineView.strokeColor = [UIColor greenColor];
    }else if([lineColor isEqualToString:@"Black"]){
        polylineView.strokeColor = [UIColor blackColor];
    }
    return polylineView;
    }else{
        MKOverlayView *overlayToReturn = [[MKOverlayView alloc]initWithOverlay:overlay];
        return overlayToReturn;
    }
}

@end

#导入
#导入“ViewController.h”
@实现视图控制器
-（无效）viewDidLoad
{
[超级视图下载]；
MKMapView*map=[[MKMapView alloc]initWithFrame:self.view.bounds]；
map.delegate=self；
[self.view addSubview:map]；
CLLocationCoordinate2D coords[]={{42，-83}，{32，-84}，{45，-78}，{42，-83}；
MKPolyline*overlay=[MKPolyline polylineWithCoordinates:coords count:4]；
[地图添加覆盖：覆盖]；
}
-（MKOverlayView*）地图视图：（MKMapView*）地图视图覆盖：（id）覆盖{
如果（[overlay class]==[MKPolyline class]）{
MKPolylineView*polylineView=[[MKPolylineView alloc]initWithPolyline:overlay]；
int lineSize=2；/[self.ud integerworkey:@“lineSize”]；
polylineView.lineWidth=线宽；
NSString*lineColor=@“红色”/[self.ud objectForKey:@“lineColor”]；
如果（[lineColor IsequalString:@“Red”]）{
polylineView.strokeColor=[UIColor redColor]；
}else if（[lineColor IsequalString:@“Blue”]）{
polylineView.strokeColor=[UIColor blueColor]；
}else if（[lineColor IsequalString:@“Orange”]）{
polylineView.strokeColor=[UIColor orangeColor]；
}else if（[lineColor IsequalString:@“Green”]）{
polylineView.strokeColor=[UIColor greenColor]；
}else if（[lineColor IsequalString:@“Black”]）{
polylineView.strokeColor=[UIColor blackColor]；
}
返回多段线视图；
}否则{
MKOverlayView*overlayToReturn=[[MKOverlayView alloc]initWithOverlay:overlay]；
回归与回归；
}
}
@结束