优化 图像模糊

ios/Classes/FlutterAmapView.m

@@ -69,11 +69,34 @@ static NSString* viewType = @"com.i2edu.mapView";
 -(MAUserLocationRepresentation*)getRepresentation{
     MAUserLocationRepresentation *r = [[MAUserLocationRepresentation alloc] init];
     r.image=[UIImage imageNamed:@"dog"];
+      r.image=[self scaleToSize: r.image size:CGSizeMake(50, 60)];
 //    r.image=[UIImage imageWithContentsOfFile:@"Assets/Images/dog.png"];
 //    r.locationDotFillColor = [UIColor redColor];
     return r;
     
 }
+- (UIImage *)scaleToSize:(UIImage *)image size:(CGSize)size {
+    // 创建一个bitmap的context
+    // 并把它设置成为当前正在使用的context
+    // Determine whether the screen is retina
+    /*
+    if([[UIScreen mainScreen] scale] == 2.0) {
+        UIGraphicsBeginImageContextWithOptions(size, NO, 2.0);
+    } else {
+        UIGraphicsBeginImageContext(size);
+    }
+     */
+    UIGraphicsBeginImageContextWithOptions(size, NO, [[UIScreen mainScreen] scale]);
+    // 绘制改变大小的图片
+    [image drawInRect:CGRectMake(0, 0, size.width, size.height)];
+    // 从当前context中创建一个改变大小后的图片
+    UIImage * scaledImage = UIGraphicsGetImageFromCurrentImageContext();
+    // 使当前的context出堆栈
+    UIGraphicsEndImageContext();
+    // 返回新的改变大小后的图片
+    return scaledImage;
+}
+
 
 - (UIView *)view{
     return _mapView;
@@ -134,6 +157,7 @@ static NSString* viewType = @"com.i2edu.mapView";
         annotationView.channel = self.channel;
         
         annotationView.image = [UIImage imageNamed:@"i2"];
+        annotationView.image=[self scaleToSize: annotationView.image size:CGSizeMake(50, 60)];
 //        annotationView.pinColor = MAPinAnnotationColorPurple;
         annotationView.canShowCallout= NO;       //设置气泡可以弹出，默认为NO
 //        annotationView.animatesDrop = YES;        //设置标注动画显示，默认为NO