objective-c - 带旋转的 MKAnnotationView 图像

Question

我想将 UIView 添加到 MKAnnotationView 作为图像。但首先我想旋转 UIView，然后将新的 UIImage 添加到 UIVIew。你能帮助我吗？我试过了，但 UIView 从不旋转。

UIView *pinView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 63, 63)];
pinView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"IconMapPin"]];
pinView.transform = CGAffineTransformMakeRotation(DEGREES_TO_RADIANS(self.heading));

UIImage *pinImage = [self imageFromUIView:pinView];    
annotationView.image = pinImage;

UIView转UIImage的方法

- (UIImage *) imageFromUIView:(UIView*)view
{
    UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.opaque, 0.0);
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return image;
}

Answer 1

删除这个，

pinView.transform = CGAffineTransformMakeRotation(DEGREES_TO_RADIANS(self.heading));

添加这个，

pinImage.transform = CGAffineTransformMakeRotation(DEGREES_TO_RADIANS(self.heading));

在此之后，

UIImage *pinImage = [self imageFromUIView:pinView]; 

所以最终代码将是，

UIView *pinView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 63, 63)];
pinView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"IconMapPin"]];


UIImage *pinImage = [self imageFromUIView:pinView]; 
pinImage.transform = CGAffineTransformMakeRotation(DEGREES_TO_RADIANS(self.heading));
annotationView.image = pinImage;