动画 gif 在使用 MKOverlayRenderer 的 MKMapView 叠加层中不起作用

问题描述

我正在尝试在 MKMapView 的叠加层中显示动画 gif.叠加层是使用 MKOverlayRenderer 创建的.为了在 iOS 7 中为 gif 设置动画，我使用 UIImage+animatedGIF 类别发布 此处.

I am trying to display an animated gif in an overlay for MKMapView. The overlay is created using the MKOverlayRenderer. To animate the gif in iOS 7, I'm using the UIImage+animatedGIF category posted here on GitHub.

动画 gif 的图像在使用类别的叠加层中显示良好；但是，gif 没有动画.我在 UIImageView 中使用该类别为 gif 设置动画没有问题，但它在地图视图叠加层中似乎无法正常工作.

The image of the animated gif displays fine in the overlay using the category; however, the gif does not animate. I have no problem using the category to animate a gif in a UIImageView but it does not seem to work correctly in a map view overlay.

如何使用此类别在地图视图叠加层中放置动画 gif?

How can I use this category to place an animated gif in a map view overlay?

或...

有没有办法在覆盖层中放置一个 UIImageView 来解决我的问题，方法是用动画 gif 设置 UIImageView?

Is there a way to place a UIImageView in the overlay which might solve my problem by setting the UIImageView with the animated gif?

我的叠加渲染器子类如下:

My overlay renderer subclass is the following:

MapOverlayRenderer.h

MapOverlayRenderer.h

#import <MapKit/MapKit.h>

@interface MapOverlayRenderer : MKOverlayRenderer
- (instancetype)initWithOverlay:(id<MKOverlay>)overlay overlayImage:(UIImage *)overlayImage;
@end

MapOverlayRenderer.m

MapOverlayRenderer.m

#import "MapOverlayRenderer.h"

@interface MapOverlayRenderer ()
@property (strong,nonatomic) UIImage *image;
@end

@implementation MapOverlayRenderer

- (instancetype)initWithOverlay:(id<MKOverlay>)overlay overlayImage:(UIImage *)overlayImage {

    self = [super initWithOverlay:overlay];

    if (self) {
        _image = overlayImage;
    }

    return self;
}

- (void)drawMapRect:(MKMapRect)mapRect zoomScale:(MKZoomScale)zoomScale inContext:(CGContextRef)context {

    CGImageRef imageReference = self.image.CGImage;

    MKMapRect theMapRect = [self.overlay boundingMapRect];
    CGRect theRect = [self rectForMapRect:theMapRect];

    CGContextScaleCTM(context, 1.0, -1.0);
    CGContextTranslateCTM(context, 0.0, -theRect.size.height);

    CGContextDrawImage(context, theRect, imageReference);
}

@end

在我的 UIViewController 中，我通过调用包含以下代码的方法来获取动画 gif 并添加叠加层:

In my UIViewController, I am fetching the animated gif and adding the overlay by calling a method which contains the following code:

NSURLSession *session = [NSURLSession sharedSession];

    [[session dataTaskWithURL:[NSURL URLWithString:radarUrl] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {

        self.radarImage = [UIImage animatedImageWithAnimatedGIFData:data];  //for animated radar image

        dispatch_async(dispatch_get_main_queue(), ^{

            [self.mapView addOverlay:self.polygon];

        });

    }] resume];

关于如何在 iOS 7 地图视图叠加层中为 gif 设置动画的任何建议将不胜感激.

Any suggestions on how to animate a gif in an iOS 7 map view overlay would be greatly appreciated.

推荐答案

https://github.com/jhurray/iOS7AnimatedMapOverlay

这是在 iOS7 中为叠加层设置动画的最佳方式

this is the best way to animate overlays in iOS7

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